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31 CX48 Connector for input power supply monitoring
32 TB3 DC link terminal block 
33 LED DC link charge LED (Warning) 
 WARNING 
 Do not touch any component in the module or any connected cable when LED (33) 
is on, because it is dangerous. 
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START-UP PROCEDURE FOR βiSVSP-B B-65425EN/02
- 70 - 
4. CONFIRMATION OF THE 
OPERATION 
4.1.2 Start-up Procedure 
Check each item according to the procedure described below. 
11. Start operating spindle motor in normal operation mode (S command). 
10. Make sure that the magnetic contactor for input is turned on. 
See Section 4.2. 
9. Release the system from the 
emergency stop state. 
7. Check the waveform on the sensor. See Subsection 4.3.4. 
6. Set and check spindle-related parameters.


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(The parameter manual is required.) 
No Yes 
5. Prepare and check a PMC ladder. 
4.Has the system been used with this connection status? 
OK 
Alarm issued. IV. Troubleshooting 3. Check the STATUS indicator. 
See Subsection 4.3.1. 
2. Supply control power (24 VDC) to the βiSVSP-B 
1. Check connection. 
8. Check CNC parameters (including servo 
parameters). 
Alarm issued. 
13. Check servo motor operation.
12. Check operations of optional spindle functions.


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B-65425EN/02 START-UP PROCEDURE FOR βiSVSP-B
- 71 - 
4.CONFIRMATION OF THE 
OPERATION
4.2 βiSVSP-B POWER SUPPLY SECTION 
4.2.1 The STATUS LED Is Off. 
Table 4.2.1 Check method and action 
No. Cause of trouble Check method Action 
1 The 24VDC external control 
power is not supplied.
Check the voltage of the external 
power supply (24VDC).
Check whether the external power 
supply is not faulty. 
Check whether the cable 
attached to the connector 
CXA2A/2C is not disconnected or


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short-circuited.
Check the cable attached to the 
connector CXA2A/2C. 
2 The cable is defective. Check whether the 5V power 
supply is not short-circuited with 
the cable connected to the pulse 
coder. 
Replace the cable connected to the 
pulse coder. 
3 The power supply is externally 
connected to 0V, GND, etc.
Check whether the power cable is 
not short-circuited Replace or repair the cable. 
4 There is a blown fuse on the 
control printed circuit board.
Check whether the fuse on the


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Check whether the fuse on the 
control printed circuit board has 
not blown. 
(See Section 4.2 about the 
location of the fuse.) 
The fuse blow can be confirmed 
by checking the element of the 
fuse visually or removing the fuse 
and checking the connection of 
the element of the fuse by the 
tester.
If the fuse has blown, the control printed 
circuit board may be faulty. Replace the 
unit. 
5 The printed circuit board is 
defective.
If the cause is not 1 to 4 above,


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START-UP PROCEDURE FOR βiSVSP-B B-65425EN/02
- 72 - 
4. CONFIRMATION OF THE 
OPERATION 
4.3 βiSVSP-B SPINDLE UNIT 
4.3.1 STATUS 1 Indicator 
 (a) 260-mm width model (b) 180-mm width model 
POWER
ERR
STATUS １
ALM
No. POWER ALM ERR STATUS1 Description 
1 Not displayed The control power is not on, or the hardware is faulty. 
See Subsection .3.3, “Spindle Amplifier” for details. 
2 Lighting 
Alphanumeri
c characters 
are 
displayed.


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are 
displayed.
During a period of approximately three seconds after the power is 
turned on, the information about the software series and edition is 
displayed in two installments. 
 First approx. 1 second: A 
 Next 1 second: Last 2 digits of the software series 
 Next 1 second: 2 digits of the software edition 
 Example) When the software series and edition are 9DB0/04 
A → B 0 → 0 4 
3 Lighting -- 
Blinking
The CNC has not been switched on.


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The machine is waiting for serial communication and parameter 
loading to end. 
4 Lighting -- 
Lighting Parameter loading has ended. The motor is not supplied with power.
5 Lighting 00 The motor is supplied with power. 
6 Lighting Lighting 01 or above is 
displayed.
Alarm state 
 The βiSVSP-B is not operable. 
 See Chapter 1 of Part IV. 
7 Lighting Lighting 01 or above is 
displayed.
Error state 
 Incorrect parameter setting or improper sequence.


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B-65425EN/02 START-UP PROCEDURE FOR βiSVSP-B
- 73 - 
4.CONFIRMATION OF THE 
OPERATION
4.3.2 Troubleshooting at Startup 
4.3.2.1 The STATUS 1 indicator is blinking with "--." 
(1) When no spindle communication alarm message is indicated on the CNC 
 Check whether the CNC software option setting or bit setting is correct. 
(2) When a communication alarm message is indicated on the CNC 
No. Cause of trouble Check method Action 
1 The cable is defective. Check the connector housing section,


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etc. Replace the cable. 
2 The printed circuit board is 
defective. Replace the unit. 
4.3.2.2 The motor does not turn. 
(1) When "--" is indicated on the STATUS 1 indicator of the βiSVSP-B 
 Check whether spindle control signals are input. (An example for the first spindle is shown below.) 
 #7 #6 #5 #4 #3 #2 #1 #0 
G070 MRDYA SFRA SRVA 
G071 *ESPA 
G029 *SSTP 
G030 SOV7 SOV6 SOV5 SOV4 SOV3 SOV2 SOV1 SOV0 
(2) When "00" is indicated on the STATUS 1 indicator of the βiSVSP-B


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No spindle speed command is input. 
 Refer to Chapter 1 in " FANUC AC SPINDLE MOTOR αi series / FANUC AC SPINDLE MOTOR βi
series /FANUC BUILT-IN SPINDLE MOTOR Bi series Parameter Manual (B-65280EN)," and check 
related parameters. 
(3) When an alarm number is indicated on the STATUS 1 indicator of the βiSVSP-B 
 See the description of the alarm number in Part IV. 
4.3.2.3 A specified speed cannot be obtained. 
(1) When the speed always differs from a specified speed 
 Check parameters.


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Check parameters. 
 Refer to Chapter 1 in " FANUC AC SPINDLE MOTOR αi series / FANUC AC SPINDLE MOTOR βi
series /FANUC BUILT-IN SPINDLE MOTOR Bi series Parameter Manual (B-65280EN)," and check 
related parameters. 
(2) When an alarm number is indicated on the STATUS 1 indicator of the βiSVSP-B 
 See the description of the alarm number in Part IV. 
4.3.2.4 When cutting is not performed, the spindle vibrates, making 
noise. 
(1) When the spindle vibrates at a particular speed


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Check whether the spindle also vibrates when the motor is turning by inertia. If the same vibration 
occurs when the motor is turning by inertia, investigate the source of mechanical vibration. There are 
several methods for turning the spindle by inertia, as described below. Because these methods involve 
machine sequences, be sure to consult with the machine tool builder. 
A. Input signal MPOF (G73.2) to 1 immediately causes the spindle to turn by inertia.


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START-UP PROCEDURE FOR βiSVSP-B B-65425EN/02
- 74 - 
4. CONFIRMATION OF THE 
OPERATION 
B. Set bit 2 (ALSP) of parameter No. 4009 to 1. Then, when the power to the CNC is turned off 
during spindle rotation, the spindle turns by inertia. At this time, on the spindle amplifier, Alarm 
24 is indicated. 
(2) When the spindle vibrates regardless of the speed (also during a control stop) 
A. Check and adjust the waveform of the spindle sensor. For details, see Subsection 4.3.4.


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B. Check that the motor part number matches its parameters. 
 Refer to FANUC AC SPINDLE MOTOR αi series / FANUC AC SPINDLE MOTOR βi series 
/FANUC BUILT-IN SPINDLE MOTOR Bi series Parameter Manual (B-65280EN) for details. 
C. Adjust the velocity loop gain and so forth. 
 Refer to FANUC AC SPINDLE MOTOR αi series / FANUC AC SPINDLE MOTOR βi series 
/FANUC BUILT-IN SPINDLE MOTOR Bi series Parameter Manual (B-65280EN) for details. 
4.3.2.5 An overshoot or hunting occurs.


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Refer to FANUC AC SPINDLE MOTOR αi series / FANUC AC SPINDLE MOTOR βi series /FANUC 
BUILT-IN SPINDLE MOTOR Bi series Parameter Manual (B-65280EN), and adjust parameters. 
4.3.2.6 Cutting power weakens or acceleration/deceleration slows 
down. 
(1) When the load meter does not indicate the maximum output 
A. A mechanical cause such as a belt slip may occur. 
B. Check whether the torque limit signal is input incorrectly. 
FS0i #7 #6 #5 #4 #3 #2 #1 #0 
G070 TLMHA TLMLA


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G070 TLMHA TLMLA 
(2) When the load meter indicates the maximum output 
A. When the αiBZ sensor is used, the sensor gear may slide over the spindle during acceleration. 
B. The motor part number may not appropriate for the specific parameters. 
 Refer to FANUC AC SPINDLE MOTOR αi series / FANUC AC SPINDLE MOTOR βi series 
/FANUC BUILT-IN SPINDLE MOTOR Bi series Parameter Manual (B-65280EN) for details. 
C. The output limit pattern may be set incorrectly.


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Refer to FANUC AC SPINDLE MOTOR αi series / FANUC AC SPINDLE MOTOR βi series 
/FANUC BUILT-IN SPINDLE MOTOR Bi series Parameter Manual (B-65280EN) for details. 
4.3.3 Status Error Indication Function 
When there is a sequence or parameter error, the error LED (yellow) in the STATUS 1 indicator of the 
βiSVSP-B goes on with an error code displayed. This can ease troubleshooting at the time of machine 
startup. 
Shown below is an example of how the LED indicator looks when an error occurs.


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Status LED indicator 
Error display
The error LED lights, and an error code 
is displayed. 
If the βiSVSP-B spindle unit does not operate for a particular function, check whether a status error is 
indicated in βiSVSP-B STATUS1.


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B-65425EN/02 START-UP PROCEDURE FOR βiSVSP-B
- 75 - 
4.CONFIRMATION OF THE 
OPERATION
No. Description Action 
01 
Although neither *ESP (emergency stop signal) 
(there are two types of signals, a PMC signal and 
PSM contact signal) nor MRDY (machine ready 
signal) has been input, SFR (forward rotation 
signal), SRV (reverse rotation signal), or ORCM 
(orientation command) is input. 
Check the *ESP and MRDY sequences. For MRDY, 
pay attention to the parameter that specifies whether to


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use the MRDY signal (bit 0 of parameter No. 4001).
03 
Although parameter settings are such that that there 
is no position sensor (position control is not to be 
performed, that is, bits 3, 2, 1, and 0 of parameter 
No. 4002 are, respectively, 0, 0, 0, and 0), a Cs axis 
contour control command has been issued. 
In this case, the motor is not activated. 
Check setting of the parameter. 
04 
Although parameter settings are such that that there


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is no position sensor (position control is not to be 
performed, that is, bits 3, 2, 1, and 0 of parameter 
No. 4002 are, respectively, 0, 0, 0, and 0), a servo 
mode (such as rigid tapping or Cs axis control) 
command or spindle synchronization control 
command has been issued. 
In this case, the motor is not activated. 
Check setting of the parameter. 
05 
Although optional parameter for the orientation 
function is not set, an ORCM (orientation command) 
is input.


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is input. 
Check setting of the parameter for orientation. 
06 
Although optional parameter for the output switching 
option is not set, low-speed winding is selected 
(RCH = 1). 
Check setting of the parameter for output switching and 
the power line status signal (RCH). 
07 
Although Cs contour control mode is input, neither 
SFR (forward rotation signal) nor SRV (reverse 
rotation signal) is input. 
Check the sequence. 
08 
Although servo mode (such as rigid tapping or Cs


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axis control) control command is input, neither SFR 
(forward rotation signal) nor SRV (reverse rotation 
signal) is input. 
Check the sequence. 
09 
Although spindle synchronization control command 
is input, neither SFR (forward rotation signal) nor 
SRV (reverse rotation signal) is input. 
Check the sequence. 
10 
Although Cs contour control command is input, 
another operation mode (servo mode, spindle 
synchronization, or orientation) is specified.


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Do not specify another mode during execution of the Cs 
contour control command. Before entering another 
mode, cancel the Cs contour control command. 
11 
Although servo mode (such as rigid tapping or 
spindle positioning) is input, another operation mode 
(Cs contour control, spindle synchronization, or 
orientation) is specified. 
Do not specify another mode during execution of the 
servo mode command. Before entering another mode, 
cancel servo mode. 
12


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cancel servo mode. 
12 
Although spindle synchronization is input, another 
operation mode (Cs contour control, servo mode, or 
orientation) is specified. 
Do not specify another mode during execution of the 
spindle synchronization command. Before entering 
another mode, cancel the spindle synchronization 
command. 
13 
Although orientation specification is input, another 
operation mode (Cs contour control, servo mode, or 
synchronization control) is specified.


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Do not specify another mode during execution of the 
orientation command. Before entering another mode, 
cancel the orientation command. 
14 The SFR (forward rotation signal) and SRV (reverse 
rotation signal) are input at the same time. Input one of the SFR and SRV signals.


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START-UP PROCEDURE FOR βiSVSP-B B-65425EN/02
- 76 - 
4. CONFIRMATION OF THE 
OPERATION 
No. Description Action 
16 
Although the parameter not to use the differential 
speed control function (bit 5 of parameter No. 4000 = 
0) is set, DEFMD (differential speed mode 
command) is input. 
Check the setting of the parameter and the differential 
speed mode command. 
17 
The parameter settings for the speed detector (bits 
2, 1, and 0 of parameter No. 4011) are invalid. There


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is no speed detector that matches the settings. 
Check the setting of the parameter. 
18 
Although parameter settings are such that that there 
is no position sensor (position control is not to be 
performed, that is, "bits 3, 2, 1, and 0 of parameter 
No. 4002 are, respectively, 0, 0, 0, and 0," a position 
coder-based orientation command has been issued.
Check the setting of the parameter and the input signal.
19 
Although magnetic sensor orientation command is


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input, another operation mode (Cs contour control, 
servo mode, or spindle synchronization) is specified.
Do not specify another mode during execution of the 
orientation command. Before entering another mode, 
cancel the orientation command. 
21 The tandem operation command was input in the 
spindle synchronization control enable state. 
Input the tandem operation command when spindle 
synchronization control is canceled. 
22 Spindle synchronization control was specified in the


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tandem operation enable state. 
Specify spindle synchronization control when torque 
tandem operation is canceled. 
23 The tandem operation command is input without the 
required option. 
Torque tandem control requires a CNC software option. 
Check the option. 
24 
Although continuous indexing in position 
coder-based orientation is to be performed, an 
absolute position command (INCMD = 0) has been 
issued after incremental operation (INCMD = 1). 
Check the INCMD (incremental command).


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Be sure to perform absolute position command-based 
orientation before an absolute position command. 
26 
The parameter settings are such that both spindle 
switch and three-stage speed range switch are 
used. 
Check the parameter settings and the input signal. 
29 
Parameter settings are such that the shortest-time 
orientation function is to be used (bit 6 of parameter 
No. 4018 is 0 and parameter Nos. 4320 to 4323 are 
nonzero). 
The shortest-time orientation function cannot be used


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in the βiSVSP-B. Use a different type of orientation. 
30 
The magnetic pole has not been detected, but a 
command is input. 
In the magnetic pole undetected state (EPFIXA = 0), 
the motor cannot be driven even when a command is 
input. Input a command in the magnetic pole detected 
state (EPFIXA = 1). When EPFSTR is set to 1, any 
command is ignored and this error is displayed even in 
the magnetic pole detected state. After the completion 
of magnetic pole detection, set EPFSTR to 0. 
31


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31 
This hardware configuration does not support the 
use of the spindle FAD function. In this case, the 
motor is not activated. 
Check the CNC model. 
32 
S0 is not specified in the velocity mode, but the 
disturbance input function is enabled (bit 7 of 
parameter No. 4395 is set to 1). 
Specify S0 in the velocity mode before enabling the 
disturbance input function (bit 7 of parameter No. 4395 
to 1). 
33 
This hardware configuration does not support the


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use of the spindle EGB function. In this case, the 
motor is not activated. 
Check the CNC model. 
34 Both spindle FAD function and spindle EGB function 
are enabled. In this case, the motor is not activated.
These functions cannot be used at the same time. 
Enable only one of the functions. 
35 Spindle Amplifier (SP) ID information cannot be 
obtained. 
Replace the spindle amplifier with one with correct ID 
information.


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B-65425EN/02 START-UP PROCEDURE FOR βiSVSP-B
- 77 - 
4.CONFIRMATION OF THE 
OPERATION
No. Description Action 
36 
The submodule SM (SSM) is faulty. 
1) The interface signal between the Spindle 
Amplifier and SSM is disconnected. 
2) SSM failure 
For the action to be taken for this status error, refer to 
Section 1.4, "Submodule SM," in Part IV in the FANUC 
AC SPINDLE MOTOR αi series / FANUC AC SPINDLE 
MOTOR βi series / FANUC BUILT-IN SPINDLE 
MOTOR Bi series Parameter Manual (B-65280EN).


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37 The current loop setting (No. 4012) has been 
changed. 
Check the setting of parameter No. 4012, and turn the 
power off, then on again. 
38 
A parameter related to communication between 
spindle amplifiers is specified incorrectly. 
Alternatively, a function unavailable with the torque 
tandem function is set. 
Check the parameters. 
39 
Although SFR (forward rotation command), SRV 
(reverse rotation command), or ORCM (orientation 
command) is input, DSCN (disconnection detection


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disable signal) is input. 
Check the sequence. Do not input DSCN 
(disconnection detection disable signal) during the 
input of a command which excites the motor. 
43 A setting which does not support the αiCZ sensor 
(serial) is used. 
Check the parameter settings. 
44 The spindle amplifier does not support the control 
period setting. 
Check the setting of parameter No. 4012. 
45 
The setting of the maximum output limit during 
cutting is not supported.


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cutting is not supported. 
This is a status error concerning the function for output 
limit during cutting. This function cannot be used in a 
system in which this error occurs. Disable this function 
by setting bit 6 of parameter No. 4011 to 0. 
46 
The CNC system software does not support spindle 
synchronous control using a nano-command. 
The CNC system software does not support a 
nano-command. Check the series and edition of the 
CNC system software. 
57


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CNC system software. 
57 
The parameter setting for concurrent use of 
optimum orientation is used and servo mode 
reference position return is not correct. 
Set non-zero value to the parameter for the servo mode 
reference position return speed (parameter No. 4074).
59 
The setting for the spindle orientation stop position 
least setting unit 360/32768deg is not correct. 
• The CNC system software does not support the 
spindle orientation stop position least setting unit


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360/32768deg. Check the series and edition of the 
CNC system software. 
• Concurrent use with the orientation function in 
spindle synchronization control (bit 6 of parameter 
No. 4014 is 1) is invalid. 
60 
The sequence for using spindle phase synchronous 
control is not correct. 
Check the sequence for phase matching of spindle 
synchronous control. When bit 3 of parameter No. 4006 
is set to 1 (not to detect the one-rotation signal 
automatically), if the spindle phase synchronous


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command is entered in a state where the one-rotation 
signal is not detected, this error occurs. Check this 
point. 
63 
Spindle DC-link stabilizer during power failure is not 
supported. 
The spindle control software does not support spindle 
DC-link stabilizer during power failure. Check the series 
and edition of the spindle control software. 
64 The gear is changed during EGB mode, when you 
use arbitrary gear ratio function for servo EGB 
(FSSB type). 
Check the sequence.


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Check the sequence. 
Do not perform gear switching during EGB mode. 
65 The function bit for using the Spindle smart acc./dec. 
function is set (bit 0 of parameter No. 4671 is set to 
1) when the common power supply does not support 
smart spindle acceleration/deceleration.
To use Spindle smart acc./dec., update the common 
power supply software. 
67 The parameter for using Spindle smart load meter 
(bit 7 of parameter No. 4542) is set when the CNC 
does not support the smart load meter.


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START-UP PROCEDURE FOR βiSVSP-B B-65425EN/02
- 78 - 
4. CONFIRMATION OF THE 
OPERATION 
No. Description Action 
68 The settings for the terminating resistance of the 
feedback (bits 6 and 7 of parameter No. 4004) are 
not correct.
Set bits 6 and 7 of parameter No. 4004 as appropriate 
for the sensor in use. 
NOTE 
*1 When status error 43 is displayed, check the following items. 
(1) For both the motor sensor and spindle sensor, the setting is made to use an


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αiCZ sensor (serial). (No.4010#2,1,0=0,1,0 and No.4002#3,2,1,0=0,1,1,0) 
(2) Spindle HRV control is not set. (No.4012#7=0) 
(3) The setting is made to use the differential speed control function. 
(No.4000#5=1) 
(4) The setting is made to use the spindle switch control function. 
(No.4014#0=1) 
(5) The setting is made so that an alarm related to position feedback is not 
detected. (No.4007#6=1 or No.4016#5=0) 
(6) The setting is made so that the disconnection of the feedback signal is not


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detected. (No.4007#5=1) 
(7) The setting is made so that an alarm related to position signal feedback is not 
detected during thread cutting. (No.4016#5=0) 
(8) The setting is made to use an external one-rotation signal. (No.4004#2=1) 
(9) The setting is made to use a position coder. (No.4002#3,2,1,0=0,0,1,0) 
(10) The setting is made to drive a synchronous spindle motor. (No.4012#6=1) 
4.3.4 Observing Data Using the SERVO GUIDE 
4.3.4.1 Overview


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4.3.4.1 Overview 
Using the servo adjustment tool, SERVO GUIDE, enables you to observe internal data for the spindle. 
This subsection describes the spindle data that can be observed using the SERVO GUIDE. It also presents 
examples of observed data. Refer to online help for detailed explanations about how to use the SERVO 
GUIDE. 
4.3.4.2 List of spindle data that can be observed using the SERVO 
GUIDE 
The following table lists the spindle data that can be observed using the SERVO GUIDE.


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Data type Description Remark 
SPEED Motor speed 
INORM Motor current amplitude 
IRMS Motor current (RMS value) 
IPEAK Motor current (amplitude value) 
TCMD Torque command 
TCMD2 Torque command 2 
VCMD Motor speed command 
VERR Speed deviation 
MCMD Move command for an individual communication cycle 
ERR Position deviation 
ERRC Position deviation (CNC) 
SYNC Synchronization error 
ORERR Position error at orientation


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B-65425EN/02 START-UP PROCEDURE FOR βiSVSP-B
- 79 - 
4.CONFIRMATION OF THE 
OPERATION
Data type Description Remark 
ORSEQ Orientation sequence data 
PCPOS Integration of position feedback value 
CSPOS Integration of position feedback value (*1) 
CSPOS2 Integration of position feedback value (*1) 
POS3D Integration of position feedback value for 3D display (*1) 
WMDAT Motion command per position loop 
ERR2 Position deviation 2 
ERR2C Position deviation 2 (CNC)


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SPCMD Speed command data from the CNC 
SPSPD Spindle speed 
SPCT1 Spindle control signal 1 
SPCT2 Spindle control signal 2 
SPCT3 Spindle control signal 3 
SPST1 Spindle status signal 1 
SPST2 Spindle status signal 2 
SFLG1 Spindle flag 1 
SPPOS Spindle position data 
LMDAT Load meter data 
DTRQ Spindle load torque (Unexpected disturbance torque detection 
function) (*1) 
FREQ Frequency of disturbance torque (Disturbance input function) (*1) 
GAIN Gain data (Disturbance input function) (*1)


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MTTMP Motor winding temperature 
MFBDF Motor sensor feedback incremental data 
(For tuning amplitude ratio and phase difference compensation) (*1) 
SFBDF Spindle sensor feedback incremental data 
(For tuning amplitude ratio and phase difference compensation) (*1) 
PA1 AD data of A phase of motor sensor (*1) 
PB1 AD data of B phase of motor sensor (*1) 
PA2 AD data of A phase of spindle sensor 
PB2 AD data of B phase of spindle sensor 
VDC DC link voltage


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VDC DC link voltage 
SFERR Semi-full error (Dual position feedback) (*1) 
SMERR Semi-closed side error (Dual position feedback) (*1) 
SPACC Spindle acceleration data (*1) 
NOTE 
*1 The data cannot be observed when the spindle is driven by a speed sensor-less 
motor. 
4.3.4.3 About the spindle control and spindle status signals 
As stated in the previous item, the SERVO GUIDE can be used to observe the PMC signals (spindle control


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signals 1, 2, and 3 and spindle status signals 1 and 2) used by the spindle. 
Listed below is the data configuration for spindle control signals 1 and 2 and spindle status signals 1 and 2. 
Refer to Chapter 3, "Input/Output Signals (CNC ↔ PMC)" of " FANUC AC SPINDLE MOTOR αi series 
/ FANUC AC SPINDLE MOTOR βi series /FANUC BUILT-IN SPINDLE MOTOR Bi series Parameter 
Manual (B-65280EN)" for explanations about each signal.


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START-UP PROCEDURE FOR βiSVSP-B B-65425EN/02
- 80 - 
4. CONFIRMATION OF THE 
OPERATION 
(a) Spindle control signal 1 (SPCT1) 
#15 #14 #13 #12 #11 #10 #9 #8 
RCH RSL INTG SOCN MCFN SPSL *ESP ARST 
#7 #6 #5 #4 #3 #2 #1 #0 
MRDY ORCM SFR SRV CTH1 CTH2 TLMH TLML 
(b) Spindle control signal 2 (SPCT2) 
#15 #14 #13 #12 #11 #10 #9 #8 
 DSCN SORSL MPOF 
#7 #6 #5 #4 #3 #2 #1 #0 
RCHHG MFNHG INCMD OVR NRRO ROTA INDX 
(c) Spindle control signal 3 (SPCT3) 
#15 #14 #13 #12 #11 #10 #9 #8


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#7 #6 #5 #4 #3 #2 #1 #0 
 
(d) Spindle status signal 1 (SPST1) 
#15 #14 #13 #12 #11 #10 #9 #8 
 RCFN RCHP CFIN CHP 
#7 #6 #5 #4 #3 #2 #1 #0 
ORAR TLM LDT2 LDT1 SAR SDT SST ALM 
(e) Spindle status signal 2 (SPST2) 
#15 #14 #13 #12 #11 #10 #9 #8 
 CSPEN 
#7 #6 #5 #4 #3 #2 #1 #0 
 EXOF SOREN INCST PC1DT 
4.3.4.4 Example of observing data 
The following figure shows an example of data (synchronization error and motor speed at rigid tapping) 
observed using the SERVO GUIDE.


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B-65425EN/02 START-UP PROCEDURE FOR βiSVSP-B
- 81 - 
4.CONFIRMATION OF THE 
OPERATION
4.4 βiSVSP-B SERVO UNIT 
4.4.1 Checking the STATUS 2 Indicator 
 (a) 260-mm width model (b) 180-mm width model 
STATUS 2
STATUS2 display Description 
Not displayed The control power is not on, or the hardware is faulty. 
See Subsection 1.3.2, “Servo Amplifier” for details. 
Alphanumeric 
characters are 
displayed. 
During a period of approximately four seconds after the power is turned on, the information


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about the software series and edition is displayed in eight installments. 
 Example) When the software series and edition are 9H00/01.0 
9 → H → 0 → 0 → 0 → 1 → . → 0
-- 
Blinking The servo amplifier is conducting a self-diagnosis. 
-- 
Lighting The system is waiting for the READY signal from the CNC. 
0 
Blinking The insulation resistance is being measured. 
0 The servo amplifier is ready. 
01 or above is 
displayed. Alarm status 
4.4.2 V Ready-off Alarm Indicated on the CNC Screen


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When the V ready-off alarm is indicated on the CNC, check the items listed below. In addition, V ready-off 
can occur also for reasons other than listed below. If the following items turn out to have not caused V 
ready-off, check diagnosis information No. 358 (V ready-off information) on the diagnosis screen and 
report it to FANUC. 
(1) Emergency stop signal (ESP) 
 Has the emergency stop signal (connector: CX4) applied to the βiSVSP-B been released?


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START-UP PROCEDURE FOR βiSVSP-B B-65425EN/02
- 82 - 
4. CONFIRMATION OF THE 
OPERATION 
(2) MCON signal 
 Hasn't setting up the axis detach function disabled the transmission of the ready command signal 
MCON from the CNC to the βiSVSP-B? 
(3) βiSVSP-B control printed-circuit board 
 The βiSVSP-B control printed-circuit board may be poorly installed or faulty. Be sure to push the 
faceplate as far as it will go. If the problem persist, replace the control printed-circuit board.


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Checking diagnosis information (DGN) No. 358 makes it possible to analyze the cause of the V ready-off 
alarm. 
Diagnosis 358 V ready-off information 
Convert the displayed value to binary form, and check bits 5 to 14 of the resulting binary number. 
When the servo amplifier starts working, these bits become 1 sequentially, starting at bit 5. When the servo 
amplifier has started normally, all of bits 5 to 14 become 1.


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Check bits 5 to 14 sequentially, starting at the lowest-order bit. The first lowest bit that is not 0 corresponds 
to the processing that caused the V ready-off alarm. 
#15 #14 #13 #12 #11 #10 #9 #8 
 SRDY DRDY INTL RLY CRDY MCOFF MCONA 
#7 #6 #5 #4 #3 #2 #1 #0 
MCONS *ESP HRDY 
 #06(*ESP) Emergency stop signal 
 #07,#08,#09 MCON signal (CNC → amplifier → converter) 
 #10(CRDY) Converter preparation completed signal 
 #11(RLY) Relay signal (DB relay energized)


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#12(INTL) Interlock signal (DB relay de-energized) 
 #13(DRDY) Amplifier preparation completed signal 
The following table lists diagnosis No. 358 values and main causes of problems. Do not insert or remove 
any connector when the power is on. 
Diagnosis No. 
358 value 
Problem Check item 
417 The emergency stop state 
persists. 
(1) Check whether the emergency stop signal input to CX4 
of βiSVSP-B has been released. 
(2) Check whether there is no problem with the connection


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or cable for communication between the amplifiers. 
(3) Replace the servo amplifier. 
993 The βiSVSP-B (common power 
supply) preparation completed 
signal (CRDY) is not output. 
(1) Check whether there is no problem with the connection 
or cable for communication (CXA2A/B) between the 
amplifiers. 
(2) Check whether the input power is supplied. 
(3) Check whether power is supplied to the operation coil of 
the magnetic contactor. Check whether there is no


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problem with connection of CX3 of the common power 
supply. 
(4) Replace the servo amplifier. 
4065 The interlock signal is not input. Replace the servo amplifier. 
225 - Replace the servo amplifier. 
481 - Replace the servo amplifier. 
2017 - Replace the servo amplifier. 
8161 - Replace the servo amplifier. 
97 - Check whether the axis detach function is set.


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B-65425EN/02 START-UP PROCEDURE FOR βiSVSP-B
- 83 - 
4.CONFIRMATION OF THE 
OPERATION
4.4.3 Method for Observing Motor Current 
This subsection explains how to observe the current that flows through the servo motor. 
(1) Method of using the SERVO GUIDE 
Refer to online help for information about how to connect to and use the servo adjustment tool "SERVO 
GUIDE" and applicable CNC systems. 
 - Setting


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- Setting 
Select an axis to be subjected to measurement in graph window channel setting. Also select IR and IS under 
Kind. Under Coef (conversion coefficient), set the maximum allowable current (Ap) for the amplifier in 
use. 
NOTE 
 The motor current sampling cycle depends on the current control cycle. 
 - Display 
Select the XTYT mode from the graph window mode (M) menu to display waveforms.


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B-65425EN/02 TROUBLESHOOTING FOR βiSVSP-B 1.OVERVIEW
- 87 - 
1 OVERVIEW 
This part describes the troubleshooting procedure. Read the section related to your current trouble to locate 
it and take an appropriate action. 
First, check the alarm number (indicated by the CNC) and the STATUS1 and STATUS2 indications in 
Chapter 2 to find the cause. 
Then, take an appropriate action according to the corresponding description in Chapter 3.


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TROUBLESHOOTING FOR βiSVSP-B B-65425EN/02
- 88 - 
2. ALARM NUMBERS AND 
BRIEF DESCRIPTIONS 
2 ALARM NUMBERS AND BRIEF 
DESCRIPTIONS 
2.1 SERVO ALARM 
LED Alarm No. 
SV Description 
SV0001 SYNC ALIGNMENT ERROR 
SV0002 SYNC EXCESS ERROR ALARM 2 
SV0003 SYNCHRONOUS/COMPOSITE/SUPERIMPOSED CONTROL MODE 
CAN'T BE CONTINUED 
SV0004 EXCESS ERROR (G31) 
SV0005 SYNC EXCESS ERROR (MCN) 
SV0006 ILLEGAL TANDEM AXIS 
SV0007 SV ALM ANOTHER PATH(MULTI AMP.) 
SV0010 SV OVERHEAT


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SV0010 SV OVERHEAT 
SV0011 SV MOTOR OVER CURRENT(SOFT) 
SV0012 4 SV DRIVE OFF CIRCUIT FAILURE 
SV0013 3 SV CPU BUS FAILURE 
SV0014 J SV CPU WATCH DOG 
SV0015 2 
(Blinking) SV LOW VOLT DRIVER 
SV0016 
b. 
C. 
d. 
SV CURRENT DETECT ERROR 
SV0017 11 SV INTERNAL SERIAL BUS FAILURE 
SV0018 11 
(Blinking) SV ROM DATA FAILURE 
SV0019 
b 
C 
d 
(Blinking) 
SV GROUND FAULT 
SV0024 PS SOFT THERMAL 
SV0031 PS ILLEGAL PARAMETER 
SV0032 PS CONTROL AXIS ERROR 1 
SV0033 PS CONTROL AXIS ERROR 2


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SV0034 PS HARDWARE ERROR 
SV0035 － SV NO FAILURE 
SV0036 A 
(Blinking) PHASE OPEN 
SV0037 9 
(Blinking) FAILURE OF SV(OPEN) 
SV0038 － FAILURE OF CURRENT CTRL. 
SV0039 8 
(Blinking) FAILURE OF SV(SHORT) 
SV0040 PS EXT-COMP. ERROR 
SV0041 PS PFB-R ERROR 
SV0042 PS PFB-C ERROR 
SV0043 PS SUB MODULE ERROR 
SV0044 MISMATCHED FUNCTION CODE


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B-65425EN/02 TROUBLESHOOTING FOR βiSVSP-B 
- 89 - 
2.ALARM NUMBERS AND 
BRIEF DESCRIPTIONS
LED Alarm No. 
SV Description 
SV0301 APC ALARM: COMMUNICATION ERROR 
SV0302 APC ALARM: OVER TIME ERROR 
SV0303 APC ALARM: FRAMING ERROR 
SV0304 APC ALARM: PARITY ERROR 
SV0305 APC ALARM: PULSE ERROR 
SV0306 APC ALARM: OVER FLOW ERROR 
SV0307 APC ALARM: MOVEMENT EXCESS ERROR 
SV0360 ABNORMAL CHECKSUM(INT) 
SV0361 ABNORMAL PHASE DATA(INT) 
SV0363 ABNORMAL CLOCK(INT) 
SV0364 SOFT PHASE ALARM(INT)


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SV0364 SOFT PHASE ALARM(INT) 
SV0365 BROKEN LED(INT) 
SV0366 PULSE MISS(INT) 
SV0367 COUNT MISS(INT) 
SV0368 SERIAL DATA ERROR(INT) 
SV0369 DATA TRANS. ERROR(INT) 
SV0380 BROKEN LED(EXT) 
SV0381 ABNORMAL PHASE (EXT) 
SV0382 COUNT MISS(EXT) 
SV0383 PULSE MISS(EXT) 
SV0384 SOFT PHASE ALARM(EXT) 
SV0385 SERIAL DATA ERROR(EXT) 
SV0386 DATA TRANS. ERROR(EXT) 
SV0387 ABNORMAL ENCODER(EXT) 
SV0401 IMPROPER V_READY OFF 
SV0403 CARD/SOFT MISMATCH 
SV0404 IMPROPER V_READY ON 
SV0407 EXCESS ERROR


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SV0407 EXCESS ERROR 
SV0409 DETECT ABNORMAL TORQUE 
SV0410 EXCESS ERROR (STOP) 
SV0411 EXCESS ERROR (MOVING) 
SV0413 LSI OVERFLOW 
SV0415 MOTION VALUE OVERFLOW 
SV0417 ILL DGTL SERVO PARAMETER 
SV0420 SYNC TORQUE EXCESS 
SV0421 EXCESS ERROR(SEMI-FULL) 
SV0422 EXCESS VELOCITY IN TORQUE 
SV0423 EXCESS ERROR IN TORQUE 
SV0430 SV MOTOR OVERHEAT 
SV0431 PS OVERLOAD 
SV0432 PS LOW VOLT. CONTROL 
SV0433 PS LOW VOLT. DC LINK 
SV0434 2 SV LOW VOLT CONTROL 
SV0435 5 SV LOW VOLT DC LINK


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SV0435 5 SV LOW VOLT DC LINK 
SV0436 SOFTTHERMAL(OVC) 
SV0437 PS OVERCURRENT 
SV0438 
b 
C 
d 
SV ABNORMAL CURRENT 
SV0439 PS OVER VOLT. DC LINK


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TROUBLESHOOTING FOR βiSVSP-B B-65425EN/02
- 90 - 
2. ALARM NUMBERS AND 
BRIEF DESCRIPTIONS 
LED Alarm No. 
SV Description 
SV0441 ABNORMAL CURRENT OFFSET 
SV0442 PS PRE-CHARGE FAILURE 
SV0443 PS INTERNAL FAN FAILURE 
SV0444 1 SV INTERNAL FAN FAILURE 
SV0445 SOFT DISCONNECT ALARM 
SV0446 HARD DISCONNECT ALARM 
SV0447 HARD DISCONNECT(EXT) 
SV0448 UNMATCHED FEEDBACK ALARM 
SV0449 
8. 
9. 
A. 
SV IPM ALARM 
SV0453 SPC SOFT DISCONNECT ALARM 
SV0454 ILLEGAL ROTOR POS DETECT


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SV0456 ILLEGAL CURRENT LOOP 
SV0458 CURRENT LOOP ERROR 
SV0459 HI HRV SETTING ERROR 
SV0460 FSSB DISCONNECT 
SV0462 SEND CNC DATA FAILED 
SV0463 SEND SLAVE DATA FAILED 
SV0465 READ ID DATA FAILED 
SV0466 MOTOR/AMP. COMBINATION 
SV0468 HI HRV SETTING ERROR(AMP) 
SV0474 EXCESS ERROR (STOP:SV) 
SV0475 EXCESS ERROR(MOVE:SV) 
SV0476 ILLEGAL SPEED CMD.(SV ) 
SV0477 ILLEGAL MACHINE POS.(SV) 
SV0478 ILLEGAL AXIS DATA(SV) 
SV0481 SAFETY PARAM ERROR(SV) 
SV0484 SAFETY FUNCTION ERROR(SV)


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SV0488 SELF TEST OVER TIME 
SV0489 SAFETY PARAM ERROR(CNC) 
SV0490 SAFETY FUNCTION ERROR(CNC) 
SV0494 ILLEGAL SPEED CMD.(CNC) 
SV0496 ILLEGAL AXIS DATA(CNC) 
SV0498 AXIS NUMBER NOT SET(CNC) 
SV0600 8 SV DC LINK OVER CURRENT 
SV0601 F SV EXTERNAL FAN FAILURE 
SV0602 6 SV RADIATOR OVERHEAT 
SV0603 
8. 
9. 
A. 
INV. IPM ALARM(OH) 
SV0604 P AMP COMMUNICATION ERROR 
SV0606 PS EXTERNAL FAN FAILURE 
SV0607 PS IMPROPER INPUT POWER 
SV0646 ABNORMAL ANALOG SIGNAL(EXT) 
SV0652 TEMP.ERROR


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SV0652 TEMP.ERROR 
SV0654 7 DB RELAY FAILURE 
SV1025 V_READY ON (INITIALIZING ) 
SV1026 ILLEGAL AXIS ARRANGE 
SV1055 ILLEGAL TANDEM AXIS 
SV1067 FSSB:CONFIGURATION ERROR(SOFT)


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B-65425EN/02 TROUBLESHOOTING FOR βiSVSP-B 
- 91 - 
2.ALARM NUMBERS AND 
BRIEF DESCRIPTIONS
LED Alarm No. 
SV Description 
SV1068 DUAL CHECK SAFETY ALARM 
SV1069 EXCESS ERROR(SERVO OFF:CNC) 
SV1070 EXCESS ERROR(SERVO OFF:SV) 
SV1071 EXCESS ERROR(MOVE:CNC) 
SV1072 EXCESS ERROR(STOP:CNC) 
SV1100 S-COMP. VALUE OVERFLOW 
SV5134 FSSB:OPEN READY TIME OUT 
SV5136 FSSB:NUMBER OF AMP. IS INSUFFICIENT 
SV5137 FSSB:CONFIGURATION ERROR 
SV5139 FSSB:ERROR 
SV5197 FSSB:OPEN TIME OUT


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TROUBLESHOOTING FOR βiSVSP-B B-65425EN/02
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2. ALARM NUMBERS AND 
BRIEF DESCRIPTIONS 
2.2 SPINDLE ALARM 
LED Alarm No. 
SP Description 
SP9001 01 MOTOR OVERHEAT 
SP9002 02 EX DEVIATION SPEED 
SP9003 03 DC-LINK FUSE IS BROKEN 
SP9004 04 PS IMPROPER INPUT POWER 
SP9006 06 THERMAL SENSOR DISCONNECT 
SP9007 07 OVER SPEED 
SP9009 09 OVERHEAT MAIN CIRCUIT 
SP9010 10 LOW VOLT INPUT POWER 
SP9011 11 PS OVER VOLT. DC LINK 
SP9012 12 OVERCURRENT POWER CIRCUIT 
13 CPU DATA MEMORY FAULT


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13 CPU DATA MEMORY FAULT 
SP9014 14 SOFTWARE SERIES MISMATCH 
SP9015 15 SPINDLE SWITCHING FAULT 
SP9016 16 RAM ERROR 
SP9017 17 ID NUMBER PARITY ERROR 
18 SUMCHECK ERROR PROGRAM ROM 
SP9019 19 EXCESS OFFSET CURRENT U 
SP9020 20 EXCESS OFFSET CURRENT V 
SP9021 21 POS SENSOR POLARITY ERROR 
SP9022 22 SP AMP OVER CURRENT 
24 SERIAL TRANSFER ERROR 
SP9027 27 DISCONNECT POSITION CODER 
SP9029 29 OVERLOAD 
SP9030 30 PS OVERCURRENT 
SP9031 31 MOTOR LOCK 
SP9032 32 SIC-LSI RAM FAULT


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SP9032 32 SIC-LSI RAM FAULT 
SP9033 33 PS PRE-CHARGE FAILURE 
SP9034 34 ILLEGAL PARAMETER 
SP9036 36 OVERFLOW ERROR COUNTER 
SP9037 37 ILLEGAL SETTING VELOCITY DETECTOR 
SP9041 41 ILLEGAL 1REV SIGN OF POSITION CODER 
SP9042 42 NO 1REV SIGN OF POSITION CODER 
SP9043 43 DISCONNECT POSITION CODER DEF. SPEED 
SP9046 46 ILLEGAL 1REV SIGN OF SCREW CUT 
SP9047 47 ILLEGAL SIGNAL OF POSITION CODER 
SP9049 49 DEF. SPEED IS OVER VALUE 
SP9050 50 SYNCRONOUS VALUE IS OVER SPEED


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SP9051 51 PS LOW VOLT. DC LINK 
SP9052 52 ITP FAULT 1 
SP9053 53 ITP FAULT 2 
SP9054 54 OVERCURRENT 
SP9055 55 ILLEGAL POWER LINE 
SP9056 56 COOLING FAN FAILURE 
SP9058 58 PS OVERLOAD 
SP9059 59 PS INTERNAL FAN FAILURE 
SP9061 61 SEMI-FULL ERROR EXCESS 
SP9065 65 SERIAL SPINDLE ALARM 
SP9066 66 COM. ERROR BETWEEN SP AMPS 
SP9067 67 FSC/EGB COMMAND ERROR 
SP9068 68 ILLEGAL SPINDLE PARAMETER 
SP9069 69 SAFETY SPEED OVER


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B-65425EN/02 TROUBLESHOOTING FOR βiSVSP-B 
- 93 - 
2.ALARM NUMBERS AND 
BRIEF DESCRIPTIONS
LED Alarm No. 
SP Description 
SP9070 70 ILLEGAL AXIS DATA 
SP9071 71 SAFETY PARAMETER ERROR 
SP9072 72 MISMATCH RESULT OF MOTOR SPEED CHECK 
SP9073 73 MOTOR SENSOR DISCONNECTED 
SP9074 74 CPU TEST ERROR 
SP9075 75 CRC ERROR 
SP9076 76 INEXECUTION OF SAFETY FUNCTIONS 
SP9077 77 MISMATCH RESULT OF AXIS NUMBER CHECK 
SP9078 78 MISMATCH RESULT OF SAFETY PARAMETER CHECK 
SP9079 79 INITIAL TEST ERROR


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SP9079 79 INITIAL TEST ERROR 
SP9080 80 ALARM AT THE OTHER SP AMP. 
SP9081 81 1-ROT MOTOR SENSOR ERROR 
SP9082 82 NO 1-ROT MOTOR SENSOR 
SP9083 83 MOTOR SENSOR SIGNAL ERROR 
SP9084 84 SPNDL SENSOR DISCONNECTED 
SP9085 85 1-ROT SPNDL SENSOR ERROR 
SP9086 86 NO 1-ROT SPNDL SENSOR 
SP9087 87 SPNDL SENSOR SIGNAL ERROR 
SP9088 88 COOLING RADI FAN FAILURE 
SP9089 89 SUB MODULE SM (SSM) ERROR 
SP9090 90 UNEXPECTED ROTATION 
SP9091 91 POLE POSITION COUNT MISS


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SP9092 92 OVER SPEED TO VELOCITY COMMAND 
A Program ROM error 
A1 Program ROM error
A2 Program ROM error
SP9110 b0 AMP COMMUNICATION ERROR 
SP9111 b1 PS LOW VOLT. CONTROL 
SP9113 b3 PS EXTERNAL FAN FAILURE 
SP9114 b4 PS CONTROL AXIS ERROR 1 
SP9115 b5 PS CONTROL AXIS ERROR 2 
SP9120 C0 COMMUNICATION DATA ERROR 
SP9121 C1 COMMUNICATION DATA ERROR 
SP9122 C2 COMMUNICATION DATA ERROR 
SP9123 C3 SPINDLE SWITCH CIRCUIT ERROR 
SP9124 C4 LEARNING CTRL ROTATION CMD ERROR


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SP9125 C5 LEARNING CTRL COMP ORDER ERROR 
SP9127 C7 LEARNING CTRL PERIOD ERROR 
SP9128 C8 SP SYNC VELOCITY ERROR EXCESS 
SP9129 C9 SP SYNC POSITION ERROR EXCESS 
SP9130 d0 TORQUE TANDEM POLARITY ERROR 
SP9131 d1 SPINDLE TUNING FUNCTION ALARM 
SP9132 d2 SER.SENSOR DATA ERROR 
SP9133 d3 SER.SENSOR TRANSFER ERROR 
SP9134 d4 SER.SENSOR SOFT PHASE ERROR 
SP9137 d7 SP DEVICE COMMUNICATION ERROR 
SP9138 d8 CURRENT LIMIT SETTING ERROR 
SP9139 d9 SER.SENSOR PULSE MISS 
SP9140 E0 SER.SENSOR COUNT MISS


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SP9141 E1 SER.SENSOR NO 1-ROT SIGNAL 
SP9142 E2 SER.SENSOR ABNORMAL 
SP9143 E3 CS HIGH SPEED CHANGE CMD ERROR 
SP9144 E4 CURRENT DETECT CIRCUIT ERROR


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TROUBLESHOOTING FOR βiSVSP-B B-65425EN/02
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2. ALARM NUMBERS AND 
BRIEF DESCRIPTIONS 
LED Alarm No. 
SP Description 
SP9145 E5 LOW VOLTAGE DRIVER 
SP9148 E8 AXIS NUMBER NOT SET 
SP9153 F3 SP NO FAILURE 
SP9154 F4 PHASE OPEN 
SP9155 F5 FAILURE OF SP (OPEN) 
SP9156 F6 FAILURE OF CURRENT CTRL. 
SP9157 F7 FAILURE OF SP (SHORT) 
SP9158 F8 MODE MISMATCH (DCS) 
SP9159 F9 MISMATCHED FUNCTION CODE 
SP9160 G0 THERMISTOR DISCONNECTION 
SP9161 G1 POW. CABLE SHORT CIRCUIT


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SP9162 G2 DELAY OF SP POS. DATA 
SP9163 G3 ILLEGAL SP POS. DATA 
SP9164 G4 FAILURE OF MASTER SENSOR 
SP9165 G5 CONTROL METHOD CHANGED 
UU FSSB master port wire break 
LL FSSB slave port wire break 
SP0756 ILLEGAL AXIS DATA 
SP9204 M4 PS SOFT THERMAL 
SP9211 L1 PS ILLEGAL PARAMETER 
SP9212 L2 PS HARDWARE ERROR 
SP9213 L3 PS EXT-COMP. ERROR
SP9214 L4 PS PFB-R ERROR
SP9215 L5 PS PFB-C ERROR
SP9216 L6 PS SUB MODULE ERROR


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B-65425EN/02 TROUBLESHOOTING FOR βiSVSP-B 
- 95 - 
3.TROUBLESHOOTING 
AND ACTION 
3 TROUBLESHOOTING AND ACTION 
3.1 TROUBLESHOOTING PROCEDURES 
3.1.1 Troubleshooting Procedure 
The smart trouble shooting function is available for the combination of the 30i-B or 0i-F series CNC and the 
βiSVSP-B series servo amplifier. The function analyzes causes of alarms and shows how to remove them. 
If an alarm occurs, switch from the CNC screen to the trouble diagnosis guidance screen and remove the


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cause of the alarm according to what is displayed on the screen. 
 ⇒ 3.2 TROUBLE DIAGNOSIS FUNCTION 
 ⇒ 3.2.1 Trouble Diagnosis Guidance 
IMPORTANT 
 To use the trouble diagnosis guidance requires keeping the trouble diagnosis 
monitor in the "SAMPLING" state. For details about how to switch to the 
"SAMPLING" state, see Subsection 3.2.3. 
The servo amplifier-related data acquired before and at the time of alarm occurrence (concerning the power


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supply, motor current, and detector) is sent to the CNC. This data can be used for troubleshooting. 
 ⇒ 3.2.2 Trouble Diagnosis Monitor 
IMPORTANT 
 The trouble diagnosis monitor can be in either of the following two states: 
"SAMPLING" and "LATCHED". 
To monitor data of new alarms, perform the "CLEAR" operation. To save the 
status observed when alarms were issued in the past, do not perform the "CLEAR" 
operation. For details of the operation, see Subsection 3.2.3.


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For lists of CNC alarm numbers related to servos and LED indication numbers on servo amplifiers, see 
Chapter 2. 
NOTE 
 Depending on the content of a failure, it may be difficult to analyze its cause 
correctly by using the smart trouble shooting function alone. In such a case, check 
the alarm number, the program associated with the alarm, and the procedure 
being performed, and contact your FANUC service representative.


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TROUBLESHOOTING FOR βiSVSP-B B-65425EN/02
- 96 - 
3. TROUBLESHOOTING 
AND ACTION 
3.2 TROUBLE DIAGNOSIS FUNCTION 
The 30i-B series CNC and 0i-F series CNC have a trouble diagnosis function, which allows you to check 
diagnostic information useful to know the status when a servo, spindle, or CNC alarm is issued, on the CNC 
screen. 
The trouble diagnosis function has the following main features: 
• "TROUBLE DGN. GUIDANCE screen": Allows you to determine the cause of an alarm according to


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the trouble diagnosis flow. 
• "TROUBLE DGN. MONITOR screen": Allows you to latch data when an alarm is issued as well as 
monitor the status of servo and spindle amplifiers during normal operation. 
• "TROUBLE DGN. GRAPHIC screen": Can display waveforms when a servo or spindle alarm is 
issued. 
Among these features, the TROUBLE DGN. GUIDANCE screen can be used to determine the cause of an


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alarm and the action to be taken for it for a short time, which can be expected to reduce the down time of the 
machines. 
The following figure shows a sample display of the TROUBLE DGN. GUIDANCE screen. 
TROUBLE DGN. GUIDANCE screen 
As the trouble diagnosis guidance, the trouble diagnosis function executes a diagnosis flow for determining 
the cause of an alarm. In most steps, the function automatically makes a decision based on information


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available in the CNC, but it may ask a question on the GUIDANCE screen in some cases. Press soft key 
[YES] or [NO] in response to the question to proceed to the next step in the guidance flow. 
NOTE 
• The most possible cause(s) and action to be taken based on obtained information 
are displayed as the cause(s) and guidance (action to be taken). Before any 
replacement, make a double check using another method (for example, detecting 
insulation resistance or checking conductivity).


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• If the result of the diagnosis is "Failure in the amplifier" for the "SV ABNORMAL 
CURRENT" alarm (SV438), "OVERCURRENT POWER CIRCUIT" alarm 
(SP9012), or "SV IPM ALARM" (SV449), check the connection and ground 
insulation between the power cable and motor before replacing the amplifier.


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B-65425EN/02 TROUBLESHOOTING FOR βiSVSP-B 
- 97 - 
3.TROUBLESHOOTING 
AND ACTION 
NOTE 
• If the result of the diagnosis is "Short-circuit on the power cable or motor winding" 
for the "SV ABNORMAL CURRENT" alarm (SV438), "OVERCURRENT POWER 
CIRCUIT" alarm (SP9012), or "SV IPM ALARM" (SV449), check the ground 
insulation between the power cable and motor as well. 
3.2.1 Trouble Diagnosis Guidance 
IMPORTANT 
 To use the trouble diagnosis guidance, the CNC must be set in the "SAMPLING"


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state. For details of operation for switchover to "SAMPLING" state, see 
Subsection 3.2.3. 
Examples of determining the cause of an alarm using the trouble diagnosis guidance are shown below using 
diagnosis of SV0411, “EXCESS ERROR (MOVING)” and SV0449, “SV IPM ALARM.” 
Example 1) When SV0411, “EXCESS ERROR (MOVING)” is issued 
(1) When this alarm is issued, perform the following steps to display the TROUBLE DGN. GUIDANCE 
screen:


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screen: 
<1> When the ALARM MESSAGE screen is not displayed, press function key . 
<2> Press the continuous menu key until soft key [GUIDE] appears. 
<3> Press the soft key [GUIDE]. 
(2) Possible causes of the alarm, “EXCESS ERROR (MOVING)” are: 
• Failure in the amplifier 
• Short-circuit on the power cable or motor winding 
• Disconnected power cable or motor winding 
• Malfunction of the servo-off signal 
• Large load change 
• Failure in the brake


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• Failure in the brake 
• Commanded speed exceeding the specification 
 As the trouble diagnosis guidance, the trouble diagnosis function executes a diagnosis flow for 
determining the cause of the alarm. In most steps, the function automatically makes a decision based 
on information available in the NC, but it may ask a question on the GUIDANCE screen in some cases. 
Press soft key [YES] or [NO] in response to the question to proceed to the next step in the guidance 
flow.


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3. TROUBLESHOOTING 
AND ACTION 
Example) When the disconnected power cable causes the alarm, “EXCESS ERROR (MOVING)” to 
be issued 
When soft key [GUIDE] is 
pressed, the message shown at 
left is displayed. The guidance 
shows an instruction to "turn the 
power off". The function performs 
a self-diagnosis to check the 
servo amplifier for a failure when 
the power to the CNC is turned 
off, then on again. 
The function performs a


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The function performs a 
self-diagnosis immediately 
after power on of the CNC. 
Then, the PHASE OPEN 
alarm is issued. Press the 
soft key [GUIDE] again to 
display the TROUBLE 
DGN. GUIDANCE screen. 
On the TROUBLE DGN. 
GUIDANCE screen, a message 
appears, which indicates that a 
possible cause is the 
disconnected power cable or 
motor winding. 
Take action according to the 
instruction in the message.


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3.TROUBLESHOOTING 
AND ACTION 
Example 2) When SV0449, “SV IPM ALARM” is issued 
(1) When this alarm is issued, perform the following steps to display the TROUBLE DGN. GUIDANCE 
screen: 
<1> When the ALARM MESSAGE screen is not displayed, press function key . 
<2> Press the continuous menu key until soft key [GUIDE] appears. 
<3> Press the soft key [GUIDE]. 
(2) Possible causes of the alarm, “SV IPM ALARM” are: 
• Failure in the amplifier


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• Failure in the amplifier 
• Short-circuit on the power cable or motor winding 
• Disconnected power cable or motor winding 
• Current control disturbance 
 As the trouble diagnosis guidance, the trouble diagnosis function executes a diagnosis flow for 
determining the cause of the alarm. In most steps, the function automatically makes a decision based 
on information available in the NC, but it may ask a question on the GUIDANCE screen in some cases.


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Press soft key [YES] or [NO] in response to the question to proceed to the next step in the guidance 
flow. 
Example) Example of the IPM alarm resulting from a short-circuited power cable 
When soft key [GUIDE] is pressed, the 
message shown at left is displayed. The 
guidance shows an instruction to "turn the 
power off". The function performs a 
self-diagnosis to check the servo amplifier 
for a failure when the power to the CNC is 
turned off, then on again. 
Press soft key [GUIDE].


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3. TROUBLESHOOTING 
AND ACTION 
Self-diagnosis was conducted 
immediately after the servo 
amplifier was turned on, and the 
"FAILURE OF CURRENT CTL" 
alarm occurred. The trouble 
diagnosis guidance screen is 
displayed again. 
The guidance displays "Is the value of SV 
DGN. INFO. set to 1 in trouble diagnosis 
monitor". See the trouble diagnosis 
monitor screen. 
Display the trouble diagnosis monitor


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screen, go to the page containing the item 
"SV DNG. INFO.", and then press the 
"CURRENT" button. 
Press [Current].


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3.TROUBLESHOOTING 
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Check the value of "SV DNG INFO.", 
which is either "0" or "1." 
"1" means that a short-circuited power 
cable or motor winding was detected 
during the servo amplifier self-diagnosis. 
Display the trouble diagnosis guidance 
screen, and press "YES." 
Press [YES]. 
The guidance suggests a possibility of a 
short-circuited power cable or motor 
winding. 
Take action according to the message.


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3. TROUBLESHOOTING 
AND ACTION 
3.2.2 Trouble Diagnosis Monitor 
IMPORTANT 
 The trouble diagnosis monitor can be in either of the following two states: 
"SAMPLING" and "LATCHED". 
To monitor data when a new alarm will be issued, perform "CLEAR" operation. On 
the contrary, to save the status when alarms were issued in the past, do not 
perform "CLEAR" operation. For details of the operation, see Subsection 3.2.3.


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The trouble diagnosis monitor can display the information described below. 
The procedures to display the TROUBLE DGN. MONITOR screen are below, 
• Press function key to display the ALARM MESSAGE screen. 
• Press the continuous menu key until the soft key [MONITOR] appears. 
• Press the soft key [MONITOR] to display the TROUBLE DGN. MONITOR screen. 
How to check the data at an alarm or just before an alarm 
On the TROUBLE DGN. MONITOR screen, you can check the following data: 
• Current data


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• Current data 
• Data at an alarm 
• Data just before an alarm during several sampling cycles 
The current data are displayed. The data at the alarm are displayed. 
 The data just one sampling cycle before are displayed. 
When an alarm is 
issued and the soft 
key [NEW] is 
pressed 
By pressing the soft 
key [BEFORE], the 
data up to five 
sampling cycles before 
the alarm can be 
displayed.


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Details of monitor screens related to servo amplifiers 
Data (unit) Description Displayed 
page number
COM. PULSE (pulse) Position command pulse 1/8 
F.B. PULSE (pulse) Position feedback pulse (Note 3) 1/8 
REF. COUNT (pulse) Reference counter 1/8 
POS. ERROR (pulse) Position error 1/8 
ACT. SPEED (1/min) Actual speed 1/8


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3. TROUBLESHOOTING 
AND ACTION 
Data (unit) Description Displayed 
page number
AMR DATA Magnetic pole position data of the motor rotor 
(256/rotation in electrical angle) 
1/8 
TORQUE CMD (%) Torque command (Maximum torque =100%) 2/8 
EFFECTIVE CURRENT (%) Maximum amplifier current =100% 2/8 
MOTOR CURRENT (A) Actual motor current 2/8 
DISTURBANCE LEVEL (%) Alarm level when unexpected torque detection is used =100% 2/8


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HEAT SIMLT (%) Result of heat simulation (OVC alarm level =100%) 2/8 
ARBITRARY DATA 1 (Note 2) 2/8 
ARBITRARY DATA 2 (Note 2) 2/82 
DC LINK VOLT. (V) Instantaneous DC link voltage value (Note 3) 3/8 
PS VOLTAGE RMS (Vrms) Average PS input voltage value during one power cycle (Note 3) 3/8 
PS VOLT. UMBALANCE (%) Average PS input voltage value during one power cycle (Note 3) 3/8 
PS VOLTAGE THD (%) Average PS input voltage THD (Total Harmonic Distortion) during 
one power cycle (Note 3) 
3/8


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3/8 
PS CURRENT (A) Average current amplitude during one power cycle (Note 3) 3/8 
PS STATUS FLAG1 (Note 4) 3/8 
PS STATUS FLAG2 (Note 4) 3/8 
PS STATUS FLAG3 (Note 4) 3/8 
PS STATUS FLAG4 (Note 4) 3/8 
PS INPUT FREQ (Hz) Average frequency value during one power cycle (Note 3) 3/8 
SV INS. INFO. Status flag of the Insulation deterioration detection function 4/8 
SV INS.RESISTANCE (MΩ) Motor insulation resistance when the Insulation deterioration 
detection function is enabled (Note 3) 
4/8


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4/8 
PS INT. TMP. (°C) PS internal temperature (Note 3) 4/8 
PS HEAT SINK TMP. (°C) PS heat sink temperature (Note 3) 5/8 
SV INT.TMP. (°C) SV internal temperature (Note 3) 5/8 
SV HEAT SINK TMP. (°C) SV heat sink temperature (Note 3) 5/8 
AMP GROUP/SLAVE Group number and slave number for each Power Supply (PS) 5/8 
PS DGN. INFO. Power Supply (PS) alarm cause determination data for use by the 
trouble diagnosis function (Note 5) 
5/8


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5/8 
AMP COMM. ERR. INF. Error status flag of inter-amplifier communication 5/8 
SV DGN. INFO. Status flag of the servo amplifier (SV) 5/8 
SV FSSB UPR. ERR. FSSB error in SV (Note 6) 6/8 
SV FSSB LWR. ERR. FSSB error in SV (Note 6) 6/8 
SV FSSB UPR. JTR. FSSB jitter in SV (Note 6) 6/8 
SV FSSB LWR. JTR. FSSB jitter in SV (Note 6) 6/8 
SDU FSSB UPR. ERR. FSSB error in SDU (Note 6) 6/8 
SDU FSSB LWR. ERR. FSSB error in SDU (Note 6) 6/8 
SDU FSSB UPR. JTR. FSSB jitter in SDU (Note 6) 6/8


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SDU FSSB LWR. JTR. FSSB jitter in SDU (Note 6) 6/8 
INT. DTCT. INTP. CNT Built-in detector interpolation counter 
Number of times that built-in sensor data were distorted by noise 
(Number of times that data errors were detected) 
7/8 
INT. DTCT. COM. CNT Built-in detector communication error counter 
Number of times that built-in sensor data were distorted by noise 
(number of communication errors were detected) 
7/8 
INT. DETECTOR WRN. Built-in sensor warning information 7/8


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EXT. DTCT. INTP. CNT External detector interpolation counter 
Number of times that separate sensor data were distorted by noise 
(umber of times that data errors were detected) 
7/8 
EXT. DTCT. COM. CNT External detector communication error counter 
Number of times that separate sensor data were distorted by noise 
(number of communication errors were detected) 
7/8 
EXT. DETECTOR WRN. Separate sensor warning information 7/8


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Data (unit) Description Displayed 
page number
SV DATA1 (Note 2) 7/8 
SV DATA2 (Note 2) 7/8 
SV DATA3 (Note 2) 7/8 
SV DATA4 (Note 2) 7/8 
LAST LATCH DATE The latest date when data are latched 8/8 
LAST LATCH TIME The latest time when data are latched 8/8 
EXECUTED FILE NAME Executed program file name at the alarm 8/8 
EXECUTED N-NUM. Executed N-number at the alarm 8/8 
NOTE


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NOTE 
1 The specified range in this list is just the range within which the monitor function 
can display data, and does not indicate the performance or rating of the system. 
2 ARBITRARY DATA 1 and ARBITRARY DATA 2, and SV DATA1 to SV DATA4 are 
used by FANUC for maintenance. 
3 The displayed values related to voltage, current, frequency, and temperature are 
approximate and contain some errors. If you require a precise value, measure the 
target item using a specific measurement instrument.


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4 PS STATUS FLAG1 to PS STATUS FLAG4 are used by FANUC for maintenance. 
5 The data is used by the trouble diagnosis function inside the CNC to automatically 
determine the alarm cause if an alarm is issued in a Power Supply (PS). To use 
this data, operate the system in the "monitoring" state, as indicated on the trouble 
monitor screen. If an alarm is issued in the "monitoring" state, the trouble 
diagnosis guidance presents the cause, by using this data.


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6 FSSB error and jitter data items indicate the FSSB communication status and are 
used by FANUC for maintenance.


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3. TROUBLESHOOTING 
AND ACTION 
Details of monitor screens related to spindle amplifiers


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3.TROUBLESHOOTING 
AND ACTION 
Data (unit) Description Displayed 
page number
OPERATION Operation mode 1/9 
GEAR/OUT SEL Selected gear kind and selected output power 1/9 
COMMAND PULSE (pulse) Position command pulse 1/9 
COMMAND SPEED (1/min) Speed command (Note 2) 1/9 
CONTROL INPUT Input signals for spindle control 1/9 
CONTROL OUTPUT Output signals for spindle control 1/9 
SPINDLE SPEED (1/min) Actual spindle speed 2/9


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ACT.MOTOR SPEED (1/min) Actual spindle motor speed (Note 2) 2/9 
LOAD METER (%) 2/9 
TORQUE COM (%) Torque command (Maximum torque = 100%) 2/9 
MOTOR CURRENT (A) Actual motor current 2/9 
HEAT SIMU.(MOTOR) (%) Result of heat simulation for motor (OVC alarm level = 100%) 2/9 
HEAT SIMU.(AMP) (%) Result of heat simulation for amplifier (OVC alarm level = 100%) 2/9 
POS. ERROR (pulse) Position error 2/9 
SYN ERR (pulse) Synchronous error for rigid tapping 2/9


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DC LINK VOLT. (V) Instantaneous DC link voltage value (Note 3) 3/9 
PS VOLTAGE RMS (Vrms) Average PS input voltage value during one power cycle (Note 3) 3/9 
PS VOLT.UMBALANCE (%) Average PS input voltage value during one power cycle (Note 3) 3/9 
PS VOLTAGE THD (%) Average PS input voltage THD (Total Harmonic Distortion) during 
one power cycle (Note 3) 
3/9 
PS CURRENT(A) Average current amplitude during one power cycle (Note 3) 3/9 
PS STATUS FLAG1 (Note 5) 3/9 
PS STATUS FLAG2 (Note 5) 3/9


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PS STATUS FLAG2 (Note 5) 3/9 
PS STATUS FLAG3 (Note 5) 3/9 
PS STATUS FLAG4 (Note 5) 3/9 
PS INPUT FREQ (Hz) Average frequency value during one power cycle (Note 3) 3/9 
SP INS.INFO. Status flag of the insulation deterioration detection function 4/9 
SP INS.RESISTANCE (MΩ) Motor insulation resistance when the insulation deterioration 
detection function is enabled (Note 3) 
4/9 
PS INT.TMP. (°C) PS internal temperature (Note 3) 5/9 
PS HEAT SINK TMP. (°C) PS heat sink temperature (Note 3) 5/9


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SP INT.TMP. (°C) SP internal temperature (Note 3) 5/9 
SP HEAT SINK TMP. (°C) SP internal temperature (Note 3) 5/9 
AMP GROUP/SLAVE Group number and slave number for each Power Supply (PS) 5/9 
PS DGN.INFO. Status flag of the Power Supply (PS) 5/9 
AMP COMM.ERR.INF. Error status flag of inter-amplifier communication 5/9 
SP DGN.INFO. Status flag of the spindle amplifier (SP) 5/9 
SP FSSB UPR.ERR. FSSB error in SV (Note 6) 6/9 
SP FSSB LWR.ERR. FSSB error in SV (Note 6) 6/9


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SP FSSB UPR.JTR. FSSB jitter in SV (Note 6) 6/9 
AMP FSSB LWR.JTR. FSSB jitter in SV (Note 6) 6/9 
INT.A/B AMPLITUDE (V) Built-in analog sensor A/B phase signal amplitude 7/9 
INT.A/B MAX FLUCT (%) Maximum fluctuation rate of the built-in analog sensor A/B phase 
signal 
7/9 
INT.A/B OFFSET A (mV) Phase A offset of the built-in analog sensor 7/9 
INT.A/B OFFSET B(mV) Phase B offset of the built-in analog sensor 7/9


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INT.A/B NOISE CNT Number of times that built-in analog sensor data were distorted by 
noise (number of times that data errors were detected)
7/9 
EXT.A/B AMPLITUDE (V) Separated analog sensor A/B phase signal amplitude 7/9 
EXT.A/B MAX FLUCT (%) Maximum fluctuation rate of the separated analog sensor A/B 
phase signal
7/9 
EXT.A/B OFFSET A(mV) Phase A offset of the separated analog sensor 7/9 
EXT.A/B OFFSET B(mV) Phase B offset of the separated analog sensor 7/9


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3. TROUBLESHOOTING 
AND ACTION 
Data (unit) Description Displayed 
page number
EXT.A/B NOISE CNT Number of times that separated analog sensor data were distorted 
by noise (number of times that data error were detected)
7/9 
INT.SRAL INTP.CNT Built-in serial sensor interpolation counter 
Number of times that built-in serial sensor data were distorted by 
noise (number of times that a data errors were detected)
8/9


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8/9 
INT.SRAL COM.CNT Built-in serial sensor communication error counter 
Number of times that built-in serial sensor data were distorted by 
noise (number of communication errors were detected.)
8/9 
INT.SRAL WRN. Built-in serial sensor warning information 8/9 
EXT.SRAL INTP.CNT External serial sensor interpolation counter 
Number of times that separated serial sensor data were distorted 
by noise (number of times that data errors were detected)
8/9


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8/9 
EXT.SRAL COM.CNT External serial sensor communication error counter 
Number of times that separated serial sensor data were distorted 
by noise (number of communication errors were detected.)
8/9 
EXT.SRAL WRN. Separated serial sensor warning information 8/9 
SP DATA1 (Note 4) 8/9 
SP DATA2 (Note 4) 8/9 
SP DATA3 (Note 4) 8/9 
SP DATA4 (Note 4) 8/9 
LAST LATCH DATE The latest date when data are latched 9/9 
LAST LATCH TIME The latest time when data are latched 9/9


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EXECUTED FILE NAME Executed program file name at the alarm 9/9 
EXECUTED N-NUM. Executed N-number at the alarm 9/9 
NOTE
1 The specified range in this list is just the range within which the monitor function 
can display data, and does not indicate the performance or rating of the system. 
2 To display COMMAND SPEED and ACT.MOTOR SPEED, set the parameters 
related to the maximum motor speed: 
• No.4020: Maximum motor speed of the main spindle


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• No.4196: Maximum motor speed of the sub-spindle (when the spindle switch 
function is used) 
3 The displayed values related to voltage, current, frequency, and temperature are 
approximate and contain some errors. If you require a precise value, measure the 
target item using a specific measurement instrument. 
4 SP DATA1 to SP DATA4 are used by FANUC for maintenance. 
5 PS STATUS FLAG1 to PS STATUS FLAG4 are used by FANUC for maintenance.


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3.TROUBLESHOOTING 
AND ACTION 
3.2.3 How to Switch the Trouble Diagnosis Guidance and Trouble 
Diagnosis Monitor to the "SAMPLING" State 
The trouble diagnosis monitor can be in either of the following two states: "SAMPLING" and 
"LATCHED". 
When an alarm is issued, it enters into the "LATCHED" state. 
When "CLEAR" operation is performed at the "LATCHED" state, the saved data when the alarm was


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issued are erased and the CNC returns to the "SAMPLING" state. 
So, 
• To monitor data when a new alarm will be issued, perform "CLEAR" operation. 
• On the contrary, to save the status when an alarm was issued in the past, do not perform "CLEAR" 
operation. 
To perform "CLEAR" operation to switch back to the "SAMPLING" state, follow the procedure below: 
 
 
Press the soft 
key [(OPRT)]. 
"SAMPLING" 
starts blinking. 
Press the soft 
key [EXEC].


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TROUBLESHOOTING FOR βiSVSP-B B-65425EN/02
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4. REPLACING SERVO 
AMPLIFIER COMPONENTS
4 REPLACING SERVO AMPLIFIER 
COMPONENTS 
This chapter describes how to replace a fan motor, absolute Pulsecoder battery, fuses, and printed-circuit 
board. 
 WARNING 
 Because the Servo Amplifier uses a large-capacitance electrolytic capacitor 
internally, the Servo Amplifier remains charged for a while even after the power is


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turned off. Before touching the Servo Amplifier for maintenance or other purposes, 
ensure your safety by measuring the residual voltage in the DC link with a tester 
and confirming that the charge indication LED (red) is off.


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4.REPLACING SERVO 
AMPLIFIER COMPONENTS 
4.1 REPLACEMENT OF A FAN MOTOR 
4.1.1 Removing the Fan Unit 
(a) 260-mm width model 
(1) Unlock the cover of the DC link terminal block, open the cover, check that the DC link is discharged 
(that the LED is off), and remove the DC link short bar. 
(2) Insert the screwdriver from the opening beside the DC link terminal block, and loosen the lower 
screws (three places) of the fan unit.


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(3) Loosen the upper screws (three places) of the fan unit. 
(4) Open the cover of the DC link terminal block, and pull out the fan unit toward you. 
(5) When mounting the fan unit, perform the procedure in reverse order. 
Check that 
the link is 
discharged. 
(1) (2) 
Upper screws (3 places) (3) (4) 
Screw holes of lower screws (3 places)


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4. REPLACING SERVO 
AMPLIFIER COMPONENTS
(b) 180-mm width model 
(1) Unlock the cover of the DC link terminal block, open the cover, check that the DC link is discharged 
(that the LED is off), and remove the DC link short bar. 
(2) Insert the screwdriver from the opening beside the DC link terminal block, and loosen the lower 
screws (two places) of the fan unit. 
(3) Loosen the upper screws (two places) of the fan unit.


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(4) Open the cover of the DC link terminal block, and pull out the fan unit toward you. 
(5) When mounting the fan unit, perform the procedure in reverse order. 
Check that 
the link is 
discharged. 
(1) (2) 
Upper screws (2 places) (3) (4) 
Screw holes of lower screws (2 places)


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4.REPLACING SERVO 
AMPLIFIER COMPONENTS 
4.1.2 Removing the Fan Motor from the Fan Unit 
(a) 260-mm width model 
(1) Remove the relay connector from the fan connector. For details, see the figure below. 
(2) Remove the two or four screws fastening the fan motor. (A screwdriver whose handle diameter is 4 
mm or less is required.) 
(3) Remove the two screws fastening the fan motor connector. 
Screws fastening 
the connector


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the connector 
Relay connector Screws fastening the fan motor
Screws fastening 
the connector 
Screws fastening the fan motor Relay connector 
When there is 1 fan motor
(when viewed from the bottom side of the amplifier) 
When there are 2 fan motors 
(when viewed from the bottom side of the amplifier)
(b) 180-mm width model 
(1) Remove the relay connector from the fan connector. For details, see the figure below.


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(2) Remove the two screws fastening the fan motor. (A screwdriver whose handle diameter is 4 mm or less 
is required.) 
(3) Remove the two screws fastening the fan motor connector. 
Screws fastening 
the connector 
Relay connector Screws fastening the fan motor
When viewed from the bottom side of the amplifier


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4. REPLACING SERVO 
AMPLIFIER COMPONENTS
4.1.3 Specifications of Fan Units and Motors for Maintenance 
(a) 260-mm width model 
Internal cooling fan Radiator cooling fan Model name 
Fan unit Fan motor Fan unit Fan motor 
βiSVSP20/20-7.5-B 
βiSVSP20/20-11-B 
βiSVSP40/40-15-B 
βiSVSP20/20/40-7.5-B 
βiSVSP20/20/40-11-B 
βiSVSP40/40/40-11-B 
βiSVSP40/40/40-15-B 
βiSVSP40/40/80-15-B 
- - A06B-6320-C601 A90L-0001-0598#A
βiSVSP40/40-18-B


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βiSVSP40/40-18-B 
βiSVSP80/80-18-B 
βiSVSP40/40-18 HV-B 
βiSVSP40/40/80-18-B 
βiSVSP80/80/80-18-B 
βiSVSP40/40/40-18 HV-B
- - A06B-6320-C602 A90L-0001-0598#B
(b) 180-mm width model 
Internal cooling fan Radiator cooling fan Model name 
Fan unit Fan motor Fan unit Fan motor 
βiSVSP20/20-7.5-B 
βiSVSP20/20-11-B 
βiSVSP10/10-11 HV-B 
βiSVSP20/20/40-7.5-B 
βiSVSP20/20/40-11-B 
βiSVSP40/40/40-11-B 
βiSVSP20/20/20-11 HV-B
- - A06B-6321-C601 A90L-0001-0598#A


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4.2 REPLACING BATTERY FOR ABSOLUTE PULSECODERS 
4.2.1 Overview 
• When the voltage of the batteries for absolute Pulsecoders becomes low, alarm 307 or 306 occurs, with 
the following indication in the CNC state display at the bottom of the CNC screen. 
Alarm 307 (alarm indicating the voltage of the battery becomes low) : 
 The indication "APC" blinks in reversed display. 
Alarm 306 (battery zero alarm) : 
 The indication "ALM" blinks in reversed display.


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• When alarm 307 (alarm indicating the voltage of the battery becomes low) occurs, replace the battery 
as soon as possible. In general, the battery should be replaced within one or two weeks, however, this 
depends on the number of Pulsecoders used. 
• When alarm 306 (battery zero alarm) occurs, Pulsecoders are reset to the initial state, in which absolute 
positions are not held. Alarm 300 (reference position return request alarm) also occurs, indicating that


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reference position return is required. 
• In general, replace the batteries periodically within the service life listed below.
- A06B-6050-K061 or D-size alkaline dry cells (LR20) : Two years (for each six-axis 
configuration) 
- A06B-6093-K001 : One years (for each three-axis configuration)


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B-65425EN/02 TROUBLESHOOTING FOR βiSVSP-B 
- 115 - 
4.REPLACING SERVO 
AMPLIFIER COMPONENTS 
NOTE 
The above values indicate the estimated service life of batteries used with FANUC 
absolute Pulsecoders. The actual battery service life depends on the machine 
configuration based on, for example, detector types. For details, contact the 
machine tool builder. 
4.2.2 Replacing Batteries 
To prevent absolute position information in absolute Pulsecoders from being lost, turn on the machine


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power before replacing the battery. The replacement procedure is described below. 
<1> Ensure that the power to the servo amplifier is turned on. 
<2> Ensure that the machine is in the emergency stop state (the motor is inactive). 
<3> Ensure that the DC link charge LED of the servo amplifier is off. 
<4> Detach the old batteries and attach new ones. 
The replacement of the batteries in a separate battery case and the replacement of the battery built into the


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servo amplifier are described below in detail. 
 WARNING 
1 The absolute Pulsecoder of each of the αi series servo motors and the βi series 
servo motors (βiS0.4 to βiS40, βiSc, and βiF) has a built-in backup capacitor. 
Therefore, even when the power to the servo amplifier is off and the batteries are 
replaced, reference position return is not required if the replacement completes 
within less than 10 minutes. Turn the power on and replace the batteries if the


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replacement will take 10 minutes or more. 
2 To prevent electric shock, be careful not to touch metal parts in the power 
magnetics cabinet when replacing the batteries. 
3 Because the servo amplifier uses a large-capacitance electrolytic capacitor 
internally, the servo amplifier remains charged for a while even after the power is 
turned off. Before touching the servo amplifier for maintenance or other purposes, 
ensure your safety by measuring the residual voltage in the DC link with a tester


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and confirming that the charge indication LED (red) is off. 
4 Be sure to replace the batteries with specified ones. Pay attention to the battery 
polarity. If a wrong type of battery is used or a battery is installed with incorrect 
polarity, the battery may overheat, blow out, or catch fire, or the absolute position 
information in the absolute Pulsecoders may be lost. 
5 Ensure that the battery connector is inserted in the correct position.


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4.2.3 Replacing the Batteries in a Separate Battery Case 
Use the following procedure to replace the batteries in the battery case.
<1> Loosen the screws on the battery case and detach the cover. 
<2> Replace the batteries in the case (pay attention to the polarity). 
<3> Attach the cover to the battery case. 
Battery case (with a cover)
A06B-6050-K060 
Batteries 
Four A06B-6050-K061 batteries or 
D-size alkaline dry cells


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TROUBLESHOOTING FOR βiSVSP-B B-65425EN/02
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4. REPLACING SERVO 
AMPLIFIER COMPONENTS
 CAUTION 
1 Four D-size alkaline dry cells (LR20) that are commercially available can be used 
as batteries. A set of four A06B-6050-K061 batteries is optionally available from 
FANUC. 
2 Replace all the four batteries with new ones. If old and new batteries are mixed, 
the absolute position information in the absolute Pulsecoders may be lost. 
4.2.4 Replacing the Battery Built into the Servo Amplifier


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Use the following procedure to replace the special lithium battery. 
<1> Detach the battery case. 
<2> Replace the special lithium battery. 
<3> Attach the battery case. 
 CAUTION 
1 Purchase the battery from FANUC because it is not commercially available. It is 
therefore recommended that you have a backup battery. 
2 When the built-in battery is used, do not connect BATL (B3) of connector 
CXA2C/CXA2A. Also, do not connect two or more batteries to the same BATL


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(B3) line. These connections are dangerous because battery output voltages may 
be short-circuited, causing the batteries to overheat. 
3 Install the battery in the servo amplifier in a direction that allows slack in the cable. 
If the battery cable is under tension, a bad connection may occur. 
4 If the +6 V pin and 0 V pin of CX5X are short-circuited, the battery may overheat, 
blow out, or catch fire, or the absolute position information in the absolute 
Pulsecoders may be lost.


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Pulsecoders may be lost. 
5 When inserting the connector, align it to the connector pins. 
Battery 
βiSVSP-B 
Battery case 
Insertion direction 
Red: +6 V 
Black: 0 V 
CX5X 
+6V 
 0V 
Connector 
Cable side


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B-65425EN/02 TROUBLESHOOTING FOR βiSVSP-B 
- 117 - 
4.REPLACING SERVO 
AMPLIFIER COMPONENTS 
[Battery sets and outlines] 
Battery ordering drawing 
number 
Manufacturer model 
number 
Battery case ordering 
drawing number Outline 
A06B-6114-K504 BR-2/3AGCT4A 
(Panasonic) A06B-6114-K506 
Used batteries 
Old batteries should be disposed as "INDUSTRIAL WASTES" according to the regulations of the country 
or autonomy where your machine has been installed.


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TROUBLESHOOTING FOR βiSVSP-B B-65425EN/02
- 118 - 
4. REPLACING SERVO 
AMPLIFIER COMPONENTS
4.2.5 Notes on Replacing a Battery (Supplementary Explanation) 
4.2.5.1 Battery connection modes 
The battery for the absolute Pulsecoder can be connected using [Connection method 1] and [Connection 
method 2] explained below. 
For details, refer to "Connecting the Battery" in the FANUC SERVO AMPLIFIER βi Series Descriptions 
(B-65322EN).


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(B-65322EN). 
[Connection method 1] Method of supplying battery power from one battery to 
multiple βiSVSP-B amplifiers 
βiSVSP-B 
Battery case 
A06B-6050-K060 
Battery 
A06B-6050-K061 
Connector 
A06B-6130-K201 
CX5X 
• If a low battery voltage or a battery voltage of 0 V is indicated by an APC (absolute Pulsecoder) alarm, 
replace the battery. If a battery voltage of 0 V is indicated, you need to make a zero point return.


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• The absolute Pulsecoder of the αi series servo motors and the βi series servo motor (βiS 0.4 to βiS 40, 
βiSc, and βiF) is incorporated with a backup capacitor as standard. This backup capacitor enables an 
absolute position detection to be continued for about 10 minutes. Therefore, no zero point return need 
be performed if the time during which servo amplifier power is kept off for battery replacement is 
within 10 minutes.


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within 10 minutes. 
 The Pulsecoder of some of the βiS series servo motors (βiS 0.2 to βiS0.3) does not include a backup 
capacitor. Be careful when replacing the battery for this Pulsecoder. See Subsection 4.2.5.2, 
“Connecting the battery for the βiS 0.2 to βiS 0.3” for details. 
• The battery service life is about two years for the αi series servo motors and the βi series servo motors 
(βiS 0.4 to βiS 40, βiSc, and βiF) if servo motors for six axes are connected. For some of the βi series


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servo motors (βiS 0.2 to βiS0.3), the battery service life is about one year. 
 FANUC recommends that you replace the batteries periodically according to the battery service life. 
• The battery unit consists of four LR20 alkaline batteries. Commercial batteries can be used in the 
battery unit. The optional battery offered by FANUC is A06B-6050-K061. 
 WARNING 
1 Do not connect more than one battery to the same BATL (B3) line. If the output


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voltage is different between the batteries, they may be short-circuited, resulting in 
the batteries becoming very hot. 
2 Install the battery with correct polarity. If the battery is installed with incorrect 
polarity, it may overheat, blow out, or catch fire.


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B-65425EN/02 TROUBLESHOOTING FOR βiSVSP-B 
- 119 - 
4.REPLACING SERVO 
AMPLIFIER COMPONENTS 
[Connection method 2] Method of building a built-in battery into each 
βiSVSP-B 
βiSVSP-B 
バッテリ
A06B-6073-K001
Battery case 
A06B-6114-K506
バッテリ 
A06B-6114-K504 
CX5X 
Battery 
• If a low battery voltage or a battery voltage of 0 V is indicated by an APC (absolute Pulsecoder) alarm, 
replace the battery (A06B-6114-K504). If a battery voltage of 0 V is indicated, you need to make a


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zero point return. 
• The absolute Pulsecoder of the αi series servo motors and the βi series servo motor (βiS 0.4 to βiS 40, 
βiSc, and βiF) is incorporated with a backup capacitor as standard. This backup capacitor enables an 
absolute position detection to be continued for about 10 minutes. Therefore, no zero point return need 
be performed if the time during which servo amplifier power is kept off for battery replacement is 
within 10 minutes.


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within 10 minutes. 
 The Pulsecoder of some of the βi series servo motors (βiS 0.2 to βiS0.3) does not include a backup 
capacitor. Be careful when replacing the battery for this Pulsecoder. See Subsection 4.2.5.2, 
“Connecting the battery for the βiS 0.2 to βiS 0.3” for details. 
• The battery service life is about one year for the βi series servo motors (βiS 0.4 to βiS 40, βiSc, and 
βiF) if servo motors for three axes are connected.


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FANUC recommends that you replace the batteries periodically according to the battery service life. 
• The built-in batteries are not commercially available. They must be purchased from FANUC. So, 
FANUC recommends that you keep spares. 
 WARNING 
1 When using the built-in batteries (A06B-6114-K504), do not connect them to the 
BATL(B3) of connector CXA2C. 
 The output voltages from different batteries may be short-circuited, resulting in the 
batteries becoming very hot.


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batteries becoming very hot. 
2 Do not connect more than one battery to the same BATL(B3) line. If the output 
voltage is different between the batteries, they may be short-circuited, resulting in 
the batteries becoming very hot. 
3 Install the battery with correct polarity. If the battery is installed with incorrect 
polarity, it may overheat, blow out, or catch fire. 
4.2.5.2 Replacing βiS 0.2 to βiS 0.3 batteries


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Some servo motors of the βi series (βiS 0.2 to βiS 0.3) do not have a backup capacitor in the Pulsecoder as a 
standard feature. Therefore, to avoid losing the absolute position data of the absolute Pulsecoder, you need to 
have the control power on when replacing the battery. The replacement procedure is described below.


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TROUBLESHOOTING FOR βiSVSP-B B-65425EN/02
- 120 - 
4. REPLACING SERVO 
AMPLIFIER COMPONENTS
[Replacement procedure] 
1 Check that the power of βiSVSP-B is on (that the "POWER" LED of STATUS LED is on). 
2 Check that the emergency stop button of the system has been pressed. 
3 Check that the motor is not excited. 
4 Check that the DC link charge LED of βiSVSP-B is off. 
5 Remove the old battery, and attach the new one.


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6 The replacement procedure is complete. You are ready to turn off the power of the system. 
 WARNING 
1 When replacing the battery, be careful not to touch bare metal parts in the power 
magnetics cabinet. Particularly, touching a high voltage part may cause electric 
shock. 
2 Before replacing the battery, check that the DC link charge LED on the front side 
of the servo amplifier is off. Replacing the battery when this LED is on may cause 
electric shock.


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electric shock. 
3 When connecting the battery, pay attention to its polarity. If connected with the 
wrong polarity, the battery may overheat, burst, or catch fire. 
4 Be careful not to short-circuit '+6V' and '0V' of the battery. If short-circuited, the 
battery may overheat, burst, or catch fire. 
4.2.6 Notes on Attaching Connectors 
If an excessive strain is applied to a connector when it is inserted or removed, a poor contact may result.


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When inserting and removing the battery connector, therefore, be careful not to apply an excessive 
wrenching force to it; just follow the instructions given in the following table. 
(1) Attaching connectors 
<1> Check the attachment 
position. 
<2> 
10 degrees or less
Plug the cable connector while 
raising it slightly. 
<3> 
5 degrees or less
Here, the angle of the cable 
connector to the horizontal 
must be 5 degrees or less. 
<4> After passing the lock pin,


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B-65425EN/02 TROUBLESHOOTING FOR βiSVSP-B 
- 121 - 
4.REPLACING SERVO 
AMPLIFIER COMPONENTS 
(2) Detaching the connector 
<1> 
Hold both the sides of the 
cable insulator and the cable, 
and pull them horizontally. 
<2> 
10 degrees or less
Pull out the cable side while 
raising it slightly. 
<3> 
5 degrees or less
Here, the angle of the cable to 
the horizontal must be 5 
degrees or less. 
4.3 HOW TO REPLACE THE FUSES AND PRINTED CIRCUIT 
BOARDS


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BOARDS 
4.3.1 How to Replace the Fuses and Printed Circuit Boards 
In the βiSVSP-B, a printed circuit board can be removed and inserted from the front of the servo amplifier. 
NOTE 
1 If the fuse has blown, the cause may be that another device (e.g., sensor) 
connected to the servo amplifier is short-circuited with the power supply. 
 Check that the other device is not faulty, and then replace the fuse. 
 If the cause is not eliminated, it is likely that the fuse will blow again.


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2 Do not use a fuse other than the one supplied from FANUC. 
3 Check the indication on the printed circuit board against that printed on the fuse to 
ensure that the rating is correct.


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TROUBLESHOOTING FOR βiSVSP-B B-65425EN/02
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4. REPLACING SERVO 
AMPLIFIER COMPONENTS
Hold the upper and 
lower hooks, and 
remove the face plate. 
Pull out printed circuit 
board B toward you. 
Printed circuit board A 
Locations of screws 
Remove the screws fastening the printed circuit boards, and pull 
out printed circuit board B. 
Printed circuit board B 
When removing the fuse 
When inserting the printed circuit board, perform the procedure above in reverse order.


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Ensure that the upper and lower hooks snap into the housing. 
If the printed circuit board is not completely inserted, the housing remains lifted. In that case, pull out the 
printed circuit board and insert it again. 
Poor connector contact may cause an unpredictable problem. 
Fuse specification 
Symbol Ordering number 
FU1 A60L-0001-0290#LM50C 
When replacing the fuse, be sure to confirm the fuse specification. 
Insert the fuse in the fuse socket securely.


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Tighten the screws to securely fasten the printed circuit board. 
Poor connector contact may cause an unpredictable problem.


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B-65425EN/02 TROUBLESHOOTING FOR βiSVSP-B 
- 123 - 
4.REPLACING SERVO 
AMPLIFIER COMPONENTS 
4.3.2 Fuse Locations 
There is one fuse on the βiSVSP-B printed-circuit board. 
Printed circuit board A 
FU2(5.0A) (Rating indicated in white)


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B-65425EN/02 
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MOTOR/DETECTOR/AMPLIFIER 
PREVENTIVE MAINTENANCE 
1.MOTOR/DETECTOR/AMPLIFIER 
PREVENTIVE MAINTENANCE 
1 MOTOR/DETECTOR/AMPLIFIER 
PREVENTIVE MAINTENANCE 
This chapter describes preventive maintenance of motors, detectors, and amplifiers that is to be performed 
by the customer the machine uses.
Contents 
1.1 LIST OF MANUALS RELATED TO MOTORS AND AMPLIFIERS...........................................128


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1.2 PREVENTIVE MAINTENANCE OF MOTORS AND DETECTORS...........................................129 
1.2.1 Warnings, Cautions, and Notes on Preventive Maintenance of Motors and Detectors ........129 
1.2.2 Preventive Maintenance of a Motor (Common to All Models) ............................................131 
1.2.2.1 Main inspection items ...........................................................................................131


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1.2.2.2 Periodic cleaning of a motor..................................................................................134 
1.2.2.3 Notes on motor cleaning........................................................................................134 
1.2.2.4 Notes on the cutting fluid (informational).............................................................134 
1.2.3 Routine Inspection of a Spindle Motor with a Through Hole ..............................................135


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1.2.4 Preventive Maintenance of a Linear Motor ..........................................................................135 
1.2.4.1 Appearance inspection of the linear motor (magnet plate)....................................136 
1.2.5 Maintenance of a Detector....................................................................................................136 
1.2.5.1 Alarms for built-in detectors (αi and βi Pulsecoders) and troubleshooting


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actions....................................................................................................................137 
1.2.5.2 Alarms for separate detectors and troubleshooting actions ...................................137 
1.2.5.3 Detailed troubleshooting methods.........................................................................138 
1.2.5.4 Maintenance of βiS servo motor (40 and 60) Pulsecoders.............................139


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1.3 PREVENTIVE MAINTENANCE OF SERVO AMPLIFIERS........................................................140 
1.3.1 Warnings, Cautions, and Notes on Operation of Servo Amplifiers......................................140 
1.3.2 Preventive Maintenance of a Servo Amplifier......................................................................143 
1.3.3 Maintenance of a Servo Amplifier........................................................................................144


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1.3.3.1 Display of the servo amplifier operation status.....................................................144 
1.3.3.2 Replacement of a fan motor ..................................................................................144 
1.4 REPLACING BATTERY FOR ABSOLUTE PULSECODERS......................................................144


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B-65425EN/02
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MOTOR/DETECTOR/AMPLIFIER 
PREVENTIVE MAINTENANCE 
1.MOTOR/DETECTOR/AMPLIFIER 
PREVENTIVE MAINTENANCE 
1.1 LIST OF MANUALS RELATED TO MOTORS AND 
AMPLIFIERS 
Details of individual motors and amplifiers are described in the manuals listed in the table below. Before 
performing periodic inspection or any other maintenance work, consult with the machine tool builder and, if


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necessary, obtain the latest version of the corresponding manual shown in the list. The information about 
the specifications of each device, such as the weight and winding resistance value, is given in the relevant 
"DESCRIPTIONS" manual. 
Manual name Type of manual Specification 
number 
FANUC AC SERVO MOTOR αi–B/αi series DESCRIPTIONS B-65262 
FANUC AC SERVO MOTOR βi –B/βi series DESCRIPTIONS B-65302 
FANUC SYNCHROUNOUS BUILT-IN SERVO MOTOR DiS series DESCRIPTIONS B-65332


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FANUC LINEAR MOTOR LiS series DESCRIPTIONS B-65382 
FANUC AC SPINDLE MOTOR αi series DESCRIPTIONS B-65272 
FANUC AC SPINDLE MOTOR βi series DESCRIPTIONS B-65312 
FANUC BUILT-IN SPINDLE MOTOR BiI series DESCRIPTIONS B-65292 
FANUC SYNCHROUNOUS BUILT-IN SPINDLE MOTOR BiS series DESCRIPTIONS B-65342 
FANUC - NSK SPINDLE UNIT series DESCRIPTIONS B-65352 
FANUC SERVO AMPLIFIER αi series DESCRIPTIONS B-65282 
FANUC SERVO AMPLIFIER βi series DESCRIPTIONS B-65322


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FANUC SERVO AMPLIFIER βi-B series DESCRIPTIONS B-65422 
FANUC AC SERVO MOTOR αi series 
FANUC AC SERVO MOTOR βi series 
FANUC LINEAR MOTOR LiS series 
FANUC SYNCHRONOUS BUILT-IN SERVO MOTOR DiS series 
PARAMETER MANUAL B-65270 
FANUC AC SPINDLE MOTOR αi/βi series 
BUILT-IN SPINDLE MOTOR Bi series PARAMETER MANUAL B-65280 
FANUC AC SERVO MOTOR αi series 
AC SPINDLE MOTOR αi series 
SERVO AMPLIFIER αi series 
MAINTENANCE MANUAL B-65285 
FANUC AC SERVO MOTOR βi series


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AC SPINDLE MOTOR βi series 
SERVO AMPLIFIER βi series 
MAINTENANCE MANUAL B-65325 
FANUC SERVO AMPLIFIER βi series MAINTENANCE MANUAL B-65395 
FANUC SERVO GUIDE OPERATOR’S MANUAL B-65404 
FANUC AC SERVO MOTOR αis/αi/βis series SERVO TUNING 
PROCEDURE (BASIC) B-65264


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B-65425EN/02 
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MOTOR/DETECTOR/AMPLIFIER 
PREVENTIVE MAINTENANCE 
1.MOTOR/DETECTOR/AMPLIFIER 
PREVENTIVE MAINTENANCE 
1.2 PREVENTIVE MAINTENANCE OF MOTORS AND 
DETECTORS 
1.2.1 Warnings, Cautions, and Notes on Preventive Maintenance of 
Motors and Detectors 
This subsection contains the safety precautions for motor and detector preventive maintenance, which are 
classified into "warnings", "cautions", and "notes" according to their bearing on safety. Make sure that you


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understand and comply with these precautions when carrying out the maintenance work. 
 WARNING 
• Make sure that you are safely dressed and have a safe working environment when 
performing preventive maintenance for a motor. 
- Be dressed safely, e.g. by wearing gloves and safety shoes, to protect against injury due to an 
edge or protrusion and electric shock. 
- Have the work done by more than one person, where possible, so that immediate action can be


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taken if an accident occurs when handling a motor. 
- A motor is heavy. When moving it, use a crane or other appropriate equipment to protect against 
injury. For information about the weight of the motor, refer to its DESCRIPTIONS manual 
(shown earlier). 
- Clothes or fingers can be caught in a rotating motor or come into contact with a moving part of it. 
Standing in the direction of motor rotation (direction of motion) can pose a risk of injury. Before


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rotating a motor, check that there is no object that is thrown away by motor rotation. 
• Be careful about electric shock, fire, and other accidents. 
- Do not handle a motor with a wet hand. 
- To prevent electric shock, make sure that no conductive object, such as a terminal, is exposed 
when the motor is powered on. 
- Before touching a motor or any surrounding part, check that the power is shut off and take 
appropriate safety precautions.


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- High voltage remains across power line terminals of a motor even after the power is shut off (for 
at least twenty minutes). Do not touch a motor in such a condition or connect it to other 
equipment. 
- A loose or disconnected terminal, short-circuited terminals, or a terminal connected to the ground 
can cause overheating, spark, fire, or damage to the motor. Take appropriate precautions to 
prevent these accidents.


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prevent these accidents. 
- When placed near any inflammable object or material, a motor can be ignited, catch fire, or 
explode. Avoid placing it near such object or material. 
• Do not disassemble or modify a motor.
 Motors such as linear motors, synchronous built-in servo motors, and synchronous built-in spindle 
motors contain very strong magnets. If electronic medical apparatus comes near, these motors can


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cause the apparatus to malfunction, potentially putting the user's life in danger. Also, disassembling or 
modifying a motor can cause a failure, regardless of the type of motor. Do not disassemble or modify 
a motor in any way not specified by FANUC.


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B-65425EN/02
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MOTOR/DETECTOR/AMPLIFIER 
PREVENTIVE MAINTENANCE 
1.MOTOR/DETECTOR/AMPLIFIER 
PREVENTIVE MAINTENANCE 
 CAUTION 
• Ensure that the specified cooling conditions are met. 
If the specified cooling conditions are not met (the motor is insufficiently or excessively cooled), the 
motor can fail. Problems that can cause a motor failure, such as liquid piping clog, leakage, and fan 
motor trouble, should be eliminated through periodic inspection. Do not drive the motor when the


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cooling system is in an abnormal condition. 
• Do not change the system configuration. 
Do not change the configuration of the system when it is running normally. Doing so can cause an 
accident or failure. If you disconnect a cable for maintenance or some other purpose, take an 
appropriate measure, such as putting a mark on it, to ensure you can restore the original state. 
• Use the tapped holes of a motor only to move the motor.


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Do not use the tapped holes of a motor to lift or move any other object along with the motor. Doing so 
can damage the motor. Depending on the type of motor, the place and direction in which the motor can 
be lifted may be predetermined. For details, refer to the DESCRIPTIONS manual of the motor (shown 
earlier). 
• Do not touch a motor when it is running or immediately after it stops. 
A motor may get hot when it is running. Do not touch the motor before it gets cool enough. Otherwise,


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you may get burned. 
NOTE 
• Do not remove a nameplate from a motor. 
The nameplate is used to identify the motor during maintenance work. If a nameplate comes off, be 
careful not to lose it. 
• Do not step or sit on a motor, and avoid applying shock to a motor. 
 Any of these acts can deform or break the motor or affect its component, crippling the normal motor 
operation. Do not put a motor on top of another motor.


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• Comply with the specified conditions when conducting an electric test (winding 
resistance test, insulation resistance test, etc.) for a motor or other device or 
supplying power. 
- Conduct an electric test according to the specified method. Conducting such a test by any method 
that is not specified can damage the motor. 
- Do not conduct a dielectric strength test or insulation test for a Pulsecoder or other detector, or do


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not apply a commercial power source voltage. Doing so can destroy the internal elements. 
• Perform preventive maintenance (inspection of the external appearance, 
measurement of winding resistance, insulation resistance, etc.) and cleaning on a 
regular basis. 
 To use a motor safely throughout its entire service life, perform preventive maintenance and cleaning 
on a regular basis. Be careful, however, because excessively severe inspection (dielectric strength test,


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etc.) can damage its windings. For information about winding resistance values, refer to the 
DESCRIPTIONS manual of the motor (its specification number is shown in this manual). Information 
about insulation resistance is given later in this manual.


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B-65425EN/02 
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MOTOR/DETECTOR/AMPLIFIER 
PREVENTIVE MAINTENANCE 
1.MOTOR/DETECTOR/AMPLIFIER 
PREVENTIVE MAINTENANCE 
NOTE 
• This manual is focused on the preventive maintenance work to be performed for a 
single FANUC motor or detector alone. The information contained herein may not 
apply depending on the type or configuration of the machine. When reading this 
manual, refer to the manual of the machine as well. If you have any questions or


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doubts, do not act on your own; please contact the machine tool builder or 
FANUC. 
• For detailed information about a motor, see the manual list shown earlier and, if 
necessary, obtain the latest version of the corresponding manual. 
1.2.2 Preventive Maintenance of a Motor (Common to All Models) 
This subsection describes the common preventive maintenance items to be handled regardless of the model


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of the motor. For the items specific to a particular motor model, see one of the subsequent subsections that 
pertains to that particular motor model. 
 CAUTION 
• The preventive maintenance method differs from machine to machine in many 
respects. Depending on the machine in use, it may be difficult for the user to 
perform periodic inspection or cleaning. If you are not sure about anything as to 
preventive maintenance, consult with the machine tool builder and ensure that you


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can perform periodic inspection and cleaning. 
• The machine should be used within the scope of specification defined by the 
machine tool builder. Using the machine in any way that is outside the specified 
scope can reduce the motor's service life or cause a failure. 
1.2.2.1 Main inspection items 
The following table summarizes the main inspection items for a motor. If any of these items is found to be


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abnormal, stop the use of the machine immediately and fix the abnormal part by repairing or replacing 
it. At the same time, identify and remove the cause and take a measure to prevent its recurrence. If it is 
difficult to take a preventive measure or to prevent its recurrence, consult with the machine tool builder or 
FANUC. 
Crack or 
deformation 
- Check the motor for any scar, crack, deformation, bulge, etc. 
- If the interior of the motor is visible or there is interference with a


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peripheral component, it is imperative to replace the motor or the 
peripheral component. 
- A light peel-off or scar of the surface may be repairable; consult with 
FANUC. 
Appearance of 
the motor 
Wet or dirty part - If you find any wet or dirty part, clean it immediately. 
- A preventive measure is needed if the part in question remains wet 
continually due to cutting fluid or dew condensation. 
Operating 
conditions 
Temperature, 
humidity, etc.


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Temperature, 
humidity, etc. 
- Comply with the operating conditions of the machine. For details of the 
operating conditions of a specific motor, refer to the corresponding 
DESCRIPTIONS manual. Generally, the ambient temperature should be 
0°C to 40°C (or 30°C for a spindle unit) and dew condensation is not 
allowed. In a place subject to severe vibration, the components of the 
motor may be broken.


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PREVENTIVE MAINTENANCE 
1.MOTOR/DETECTOR/AMPLIFIER 
PREVENTIVE MAINTENANCE 
Cable - Check for any cable sheath damage, exposed conductor, damaged 
conduit or cable bearing, abnormal bending, loose terminal, etc. 
- If there is any trace of fluid flowing, the fluid may have entered the inside 
of the motor or connector. It is necessary to make a check and take a 
measure to prevent recurrence. 
Connection 
state


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Connection 
state 
Connector/terminal - Check for any cracked, exposed, loose, or removed terminal or 
connector, etc. 
- Fluid causes a failure; be sure to remove fluid. 
- A scarred or damaged connector or terminal needs to be replaced. In the 
case of a resin molded motor, such as a linear motor, the motor needs to 
be replaced. 
Noise/vibration - Check for any abnormal noise or vibration not only when the motor is 
running (the spindle is rotating) but also when it is stopped.


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- Abnormal noise heard when the motor is rotating indicates an 
abnormality of the bearing or a failure inside the motor. 
- If abnormal noise is generated from the connection section of a Spindle 
Amplifier, check the following items: 
Belt connection: Check whether the belt tension is appropriate. 
Gear connection: Check whether an appropriate value is set for the gear 
backlash. 
Coupling connection: Check whether the coupling is free from 
deformation, crack, and looseness.


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Movement - Check that the motor operates normally and smoothly. 
- If the circuit breaker trips at the same time the motor starts to operate, it 
indicates abnormal motor windings. 
Operation of 
the motor 
Heat Check whether the motor does not overheat during the normal operation 
cycle. 
Note: While the motor is running or immediately after it is stopped, the motor 
surface may become very hot. Instead of touching the motor directly by hand, 
use a thermolabel, surface thermometer, etc.


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Winding resistance If the resistance value exceeds the specified range, the motor needs to be 
replaced. 
Note: When conducting winding resistance measurement, disconnect the 
motor from the amplifier and measure the resistance at the power line or 
connector closest to the motor. 
Electric 
characteristics 
of the motor 
Insulation 
resistance 
For the measuring method and judgment criteria, see the table that follows.


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Noise/vibration - Check that the fan blows air normally without causing abnormal noise or 
vibration. 
- If abnormal noise is heard even when the motor is stopped, it indicates a 
fan motor failure. 
Cooling fan 
(for a model 
with a fan 
motor) 
Movement - If the power is on and if the fan does not operate or the fan blades cannot 
be moved even manually, or if the fan blades are rotating but no cooling 
wind is blown out, the fan motor may have cutting chips or sludge


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accumulated in it and needs to be cleaned. 
- If the fan does not operate normally for any other reason, the fan motor 
needs to be replaced.


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1.MOTOR/DETECTOR/AMPLIFIER 
PREVENTIVE MAINTENANCE 
Dew condensation 
(over-cooling) 
- Check that forcible cooling does not cause dew condensation on the 
motor surface. Dew condensation is likely particularly when the cooling 
unit continues to run after the machine is stopped. In that case, be sure 
to make this check. 
- Dew condensation or water drop on the motor surface can reduce the


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motor's service life. It is necessary to wipe it dry and take a measure to 
prevent recurrence. 
Forcible 
cooling unit 
(when using an 
external 
cooling unit 
such as liquid 
cooling unit) 
Liquid 
leakage/clog 
- Check the cooling pipe for leakage or clog. Do not drive the motor unless 
the leakage or clog is fixed. 
- Liquid leakage from a spindle motor with a through hole indicates a 
failure of the coolant joint. In this case, the joint needs to be replaced.


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- In the case of liquid leakage from a linear motor (coil slider), the linear 
motor (coil slider) needs to be replaced. 
- If the motor gets wet due to liquid leakage or any other cause, it is 
necessary to clean and dry the motor and perform electric characteristic 
checks (winding resistance/insulation resistance). 
Insulation resistance measurement 
The following table shows the judgment criteria to be applied when measuring insulation resistance


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between winding and frame using a megohmmeter (500 VDC). 
Insulation resistance Judgment 
100M Ω or higher Acceptable 
10M to 100M Ω The winding has begun deteriorating. There is no problem with the performance at present. 
Be sure to perform periodic inspection. 
1M to 10M Ω The winding has considerably deteriorated. Special care is in need. Be sure to perform 
periodic inspection. 
Lower than 1M Ω Unacceptable. Replace the motor.


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If insulation resistance drops sharply during a short period of time or if the circuit breaker trips, the cutting 
fluid or other foreign matter may have entered the inside of the motor or cable. In that case, contact the 
machine tool builder or FANUC for instructions. 
 CAUTION 
• Let the motor dry and cool to room temperature before winding or insulation 
resistance is measured. Otherwise, not only an accurate measurement cannot 
be performed but also the motor may be damaged.


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• The winding or insulation resistance measurement should be performed on the 
motor alone, with its power line disconnected. 
Measuring insulation resistance with the motor connected to the amplifier may 
damage the amplifier. 
• During insulation resistance measurement, applying voltage to the motor for a 
long time may further deteriorate the insulation of the motor. Therefore, the 
measurement of insulation resistance should be performed in a minimum amount 
of time where possible.


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of time where possible. 
• When disconnecting the power line and other cables, take an appropriate 
measure, such as labeling, to ensure that they can be restored to their original 
state.


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1.MOTOR/DETECTOR/AMPLIFIER 
PREVENTIVE MAINTENANCE 
1.2.2.2 Periodic cleaning of a motor 
Periodic cleaning is necessary to remove an accumulation of cutting chips or sludge that may eventually 
cause a failure. Also, leaving the cutting fluid or other chemical substance attached for a long time can 
reduce the motor's service life substantially. When forcible cooling is provided by a liquid or air cooling


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unit, check the unit for pipe clog, fan failure, etc. and perform cleaning periodically to ensure that the 
coolant flows smoothly and that the motor is cooled properly. 
 WARNING 
 Depending on the type of motor, the handling may involve a risk and require safety 
education in advance. Also, some machines are difficult for users to clean on their 
own. If you are to clean the motor, consult with the machine tool builder in advance 
with regard to the cleaning method, safety education, etc.


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1.2.2.3 Notes on motor cleaning 
A motor is an electric product, which is incompatible with most kinds of fluid. When removing cutting 
chips, sludge, cutting fluid, etc. during cleaning, note the following. 
Note on cleaning Measure 
Do not sprinkle fluid. 
Do not wash by 
submerging. 
Do not sprinkle or spray detergent or any other fluid over the motor (including its 
peripheral components), or do not wash the motor by submerging it in such fluid. When


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cleaning the motor, use a cloth moistened with a small amount of neutral detergent so 
that the fluid does not enter the inside the motor. 
Do not use solvent. 
Solvent may damage the motor; do not use one. If the dirt is difficult to remove with 
neutral detergent, use a cloth moistened with a small amount of industrial alcohol (e.g., 
IPA). Be careful, however, because rubbing with force or repeatedly may damage the 
coated or resin surface. 
Do not leave the motor 
wet or moistened.


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wet or moistened. 
If the motor is wet or moistened after cleaning, dry it before supplying power and before 
performing electric tests. When drying the motor in an oven, make sure that the 
temperature is below 40°C and that hot air does not blow directly against the motor. 
1.2.2.4 Notes on the cutting fluid (informational) 
Depending on the type of cutting fluid used, the motor and amplifier may be affected greatly. Take due care


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because, even if you ensure that they do not come into direct contact with the fluid, a mist or atmosphere of 
the fluid can cause the problems described below. 
Type of cutting fluid 
requiring care 
Expected problem 
Cutting fluid containing 
highly active sulfur 
Some types of cutting fluid contain highly active sulfur. If such cutting fluid enters the 
inside of the motor or amplifier, it causes copper, silver, and other kinds of metal to 
corrode, leading to a component failure.


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Synthetic cutting fluid 
with high permeability 
Some types of cutting fluid containing such substance as polyalkylene glycol have 
very high permeability. Such cutting fluid permeates into the inside of the motor, 
causing insulation deterioration or component failure. 
Highly alkaline, 
water-soluble cutting 
fluid 
Some types of cutting fluid that enhance their alkaline property using such substance as 
alkanolamine remain highly alkaline - pH10 or higher - when diluted. If such cutting


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fluid is left attached for a long time, its chemical change will deteriorate the resin and 
other materials of the motor and amplifier. 
Other types of cutting fluid not mentioned above may cause various unexpected problems. If any problem 
arises for which the cutting fluid is thought to be responsible, consult with the machine tool builder or 
FANUC.


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1.MOTOR/DETECTOR/AMPLIFIER 
PREVENTIVE MAINTENANCE 
1.2.3 Routine Inspection of a Spindle Motor with a Through Hole 
• Check whether coolant does not always leak from the drain on the rotation joint support housing. (See 
Fig. 2) 
• Check whether coolant does not always leak from the notch on the rotation joint support housing. (See 
Fig. 2)


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Fig. 2) 
• Check whether coolant leaking from the coolant joint does not leak from the coupling. (See Fig. 3) 
• Check whether leaking coolant is not collected in the coupling box. 
Coupling Rotation joint support housing
Fig. 1: Example of using a coolant-through spindle motor 
Coolant joint 
φd
φd
凸タイプ 凹タイプ
Fig. 3: Example of a coolant joint 
Drain 
Notch Spare drain 
Rotation joint support 
housing
Fig. 2: Rotation joint support housing 
Convex type Concave type


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Convex type Concave type 
1.2.4 Preventive Maintenance of a Linear Motor 
The magnet plate of a linear motor contains very strong magnets. When performing the maintenance work, 
make sure all those engaged in the work fully understand the potential risks involved.


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1.MOTOR/DETECTOR/AMPLIFIER 
PREVENTIVE MAINTENANCE 
 WARNING 
• The FANUC linear motors use very strong magnets. Improper handling of the 
motor is very dangerous and can lead to a serious accident. Particularly, a person 
wearing a pacemaker or other medical apparatus should stay away from the linear 
motor; otherwise, the apparatus may malfunction, potentially resulting in a 
life-threatening accident.


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life-threatening accident. 
• Those who will come near or touch a linear motor for maintenance work should 
receive safety education in advance. For details, contact the machine tool builder 
or FANUC. 
1.2.4.1 Appearance inspection of the linear motor (magnet plate) 
Perform an appearance inspection as well during cleaning or other maintenance work. A crack, chip, 
deformation, or any other abnormality in appearance of the motor can lead to a serious failure in the


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not-so-distant future. If you find any such abnormality, be sure to report it to the machine tool builder. A 
scratch or other slight scar on the motor surface can also be a sign of future trouble and needs to be 
addressed with care. Some suggested appearance inspection items for the magnet plate are described below. 
* For the coil slider (the side to which the power line is connected), see "Main inspection items" earlier 
in this manual.


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in this manual. 
Appearance of the magnet plate (which may have a stainless cover) 
Appearance inspection item Measure 
Crack or chip in the magnet plate resin 
Deformation or bulge of the magnet plate or 
softening of the resin 
The magnet plate needs to be replaced. If unattended, it can cause 
trouble in the not-so-distant future. If the problem is extremely 
minor, consult with the machine tool builder or FANUC. 
The magnet is exposed, or the resin or


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magnet is floating The magnet plate needs to be replaced urgently. 
Scratch on the magnet plate 
Foreign matter may have entered into the motor, or interference 
between parts is likely. It is necessary to eliminate the cause and 
take a measure to prevent recurrence. 
Floating, bulging, or deformed stainless 
cover The cover or magnet plate needs to be replaced. 
1.2.5 Maintenance of a Detector 
 CAUTION 
• Detectors such as Pulsecoders are precision equipment. When handling a


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detector, avoid applying shock to it. Also, exercise care to prevent cutting powder, 
dust, cutting fluid, or other foreign matter from attaching to it. 
• Make sure that all connectors are connected properly and securely. A connection 
failure can cause an alarm or some other problem. 
• If the detector and/or connectors are not installed securely, cutting fluid may enter 
the inside of the detector, making it necessary to replace the detector. In that case,


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contact the machine tool builder or FANUC. 
NOTE 
If you use a detector not manufactured by FANUC, contact the machine tool 
builder or detector manufacturer for detailed information on the detector.


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1.MOTOR/DETECTOR/AMPLIFIER 
PREVENTIVE MAINTENANCE 
1.2.5.1 Alarms for built-in detectors (αi and βi Pulsecoders) and 
troubleshooting actions 
These alarms concern built-in detectors that are connected directly to the control unit (CNC/servo 
amplifier). 
Based on the alarm number and description, take an appropriate action as described in the following 
subsection, "Detailed troubleshooting methods".


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Alarm No.: Alarm Description Possible cause Action 
Detailed 
troubleshooting 
method 
361: ABNORMAL PHASE 
DATA(INT) 
- Communication 
error in the 
Pulsecoder 
- ID data error 
- Pulse coder failure 
- Noise 
Replace the 
Pulsecoder. 
(3) 
(4) 
364: SOFT PHASE 
ALARM(INT) Position data alarm - Noise 
- Entry of cutting fluid 
Check the effect 
of noise. 
Replace the 
Pulsecoder. 
(1) 
(3) 
365: BROKEN LED(INT) LED disconnection - Pulse coder failure Replace the


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Pulsecoder. (3) 
366: PULSE MISS(INT) Small internal signal 
amplitude 
- Pulse coder failure 
- Noise 
Replace the 
Pulsecoder. 
(3) 
(4) 
367: COUNT MISS(INT) Position data count 
error 
- Pulse coder failure 
- Noise 
Replace the 
Pulsecoder. 
(3) 
(4) 
368: SERIAL DATA 
ERROR(INT) 
Communication 
interruption 
- Cable disconnection
- Pulse coder failure 
- Noise 
Check the cable. 
Replace the 
Pulsecoder. 
(2) 
(3) 
(4) 
369: DATA TRANS. 
ERROR(INT) 
Communication data


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Communication data 
alarm - Noise Check the effect 
of noise. (1) 
453: SPC SOFT 
DISCONNECT ALARM 
Position - pole data 
error 
- Pulse coder failure 
- Entry of cutting fluid 
Replace the 
Pulsecoder. (3) 
1.2.5.2 Alarms for separate detectors and troubleshooting actions 
These alarms concern separate detectors that are connected to the control unit via a separate detector 
interface unit (SDU).


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interface unit (SDU). 
Based on the alarm number and description, take an appropriate action as described in the following 
subsection, "Detailed troubleshooting methods". 
Alarm No.: Alarm Description Possible cause Action 
Detailed 
troubleshooting 
method 
380: BROKEN LED(EXT) LED disconnection
382: COUNT MISS(EXT) Position data count 
error 
383: PULSE MISS(EXT) Small internal 
signal amplitude 
384: SOFT PHASE 
ALARM(EXT) Position data alarm
- Detector failure Replace the


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detector. (4) 
385: SERIAL DATA 
ERROR(EXT) 
Communication 
interruption 
- Cable disconnection 
- Noise 
- Detector failure 
Check the cable. 
Check the effect 
of noise. 
Replace the 
detector. 
(2) 
(1) 
(4)


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PREVENTIVE MAINTENANCE 
Alarm No.: Alarm Description Possible cause Action 
Detailed 
troubleshooting 
method 
386: DATA TRANS. 
ERROR(EXT) 
Communication 
data alarm - Noise Check the effect 
of noise. (1) 
381: ABNORMAL PHASE 
(EXT) 
387: ABNORMAL 
ENCODER(EXT) 
For details, contact the machine tool builder or detector manufacturer. 
1.2.5.3 Detailed troubleshooting methods


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(1) Checking the effect of noise 
Check CNC diagnosis information No.356 (Built-in detector), No.357 (Separate detector). 
Normally, 0 is displayed. However, if the position data from the Pulsecoder becomes unstable due to noise 
or some other factor, this value is incremented. The value is cleared when the CNC unit is powered off. 
Immediately after the power is turned on, 0 is displayed. 
(2) Checking the cable


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(2) Checking the cable 
Check whether the feedback cable is not disconnected and whether the connector is properly plugged. 
(3) Replacing the Pulsecoder 
(3)-1 Pulsecoder replacement procedure 
<1> Remove the four M4 hexagon socket head cap 
screws fastening the Pulsecoder. The M3 bolts 
fastening the Pulsecoder cover do not need to 
be loosed. (See the figure at right.) 
<2> Remove the Pulsecoder and Oldham's coupling 
(see the following figure).


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(see the following figure). 
<3> Set the new Pulsecoder and Oldham's coupling on 
the motor. Adjust the direction of the mate 
Oldham's coupling to that of the Oldham's coupling 
so that the teeth are engaged. 
 Push in the Pulsecoder until the O ring fits in the 
joint between the motor and Pulsecoder. Take care 
so that the O ring of the Pulsecoder is not bitten. 
Attach the Pulsecoder in such a direction that the 
power connector of the servo motor and the feedback


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cable of the Pulsecoder face the same direction or that 
the thermistor connection parts of the servo motor 
and Pulsecoder match each other (see the figure at 
left). 
Bolt fastening the Pulsecoder cover M3 
× Do not loosen 
○ Remove 
Oldham's coupling
Mate Oldham's coupling 
O ring
Adjust the connector direction 
Bolt fastening the Pulsecoder M4
Adjust the connection parts 
Thermistor connector 
Pulse coder Servo motor


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1.MOTOR/DETECTOR/AMPLIFIER 
PREVENTIVE MAINTENANCE 
<4> Fastening the Pulsecoder with the four M4 hexagon socket head cap screws. (Appropriate torque: 1.5 
Nm) 
(3)-2 Feedback cable plugging procedure 
Plug in the feedback cable connector, as instructed in the 
procedure below, and check that the connector is securely 
connected. 
<1> Check the plugging side and key direction.


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Check that the plugging side is free of foreign matter, 
such as dirt or oil. 
 
<2> Plug in the feedback cable connector. 
 Hold the connector, as shown in the figure at 
right. Plug in the connector until you hear a 
click. 
<3> Check the connection condition. 
1. Check that the arrow mark of the 
connector is at the center, as shown in 
the figure at right. If the arrow mark is 
not at the center, turn the coupling nut 
manually until the mark comes to the 
appropriate position.


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appropriate position. 
2. Hold the connector by the same part as in <2>, and pull it lightly to check that the connector does 
not come off. Do not pull the cable. 
(4) If troubleshooting is difficult for the user 
If the problem is difficult for the user to troubleshoot because it is due to a detector failure or noise, consult 
with the machine tool builder or FANUC. 
1.2.5.4 Maintenance of βiS servo motor (40 and 60) Pulsecoders


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Problems concerning the Pulsecoders of the motors listed in the table below require the maintenance 
(replacement) of the entire motor (it is not possible to maintain the Pulsecoder alone). 
Motor model Motor specification Remarks 
βiS 0.2/5000 A06B-0111-Bcc3#dddd 
βiS 0.3/5000 A06B-0112-Bcc3#dddd 
Frame size 40 
βiS 0.4/5000 
βiS 0.4/5000-B
A06B-0114-Bcc3#dddd 
A06B-2114-Bcc3#dddd 
βiS 0.5/6000 
βiS 0.5/6000-B
A06B-0115-Bcc3#dddd 
A06B-2115-Bcc3#dddd 
βiS 1/6000 
βiS 1/6000-B


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βiS 1/6000 
βiS 1/6000-B
A06B-0116-Bcc3#dddd 
A06B-2116-Bcc3#dddd 
Frame size 60 
(cc, dddd : Any) 
Main key Coupling nut 
Straight type Right angle type
Caution) 
Do not hold the coupling nut. 
1mm or less


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PREVENTIVE MAINTENANCE 
1.3 PREVENTIVE MAINTENANCE OF SERVO AMPLIFIERS 
1.3.1 Warnings, Cautions, and Notes on Operation of Servo 
Amplifiers 
This subsection contains the safety precautions on preventive maintenance of a servo amplifier (a generic 
term to refer to the βiSV-B and βiSVSP-B). These precautions are classified into "warnings", "cautions",


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and "notes" according to their bearing on safety. Make sure that you understand and comply with these 
precautions when carrying out the maintenance work. 
 WARNING 
• Make sure that you are safely dressed and have a safe working environment when 
performing preventive maintenance for a servo amplifier. 
- Be dressed safely, e.g. by wearing gloves and safety shoes, to protect against injury due to an 
edge or protrusion and electric shock.


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- Have the work done by more than one person, where possible, so that immediate action can be 
taken if an accident occurs when handling a motor. 
- A servo amplifier and AC reactor contain heavy components. Be careful when transporting them 
or mounting them on the power magnetic cabinet. Also be careful not to get your fingers caught 
between the power magnetics cabinet and servo amplifier.
• Before turning on the power, check that the door of the power magnetics cabinet and 
all other doors.


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all other doors. 
- Ensure that the door of the power magnetics cabinet containing the servo amplifier, as well as all 
other doors, are closed and locked except during maintenance work. 
• When the need arises to open the door of the power magnetics cabinet, only a person 
trained in the maintenance of the corresponding machine or equipment should do the 
task after shutting off the power supply to the power magnetics cabinet by opening


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both the input circuit breaker of the power magnetics cabinet and the factory switch 
used to supply power to the cabinet. 
• Be careful about electric shock, fire, and other accidents. 
- If the machine must be operated with the door open for adjustment or some other purpose, the 
operator must keep his or her hands and tools well away from any dangerous voltages. Such work 
must be done only by a person trained in the maintenance of the machine or equipment.


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- Ensure that the door of the power magnetics cabinet is locked so that the door cannot be opened 
by anyone, except service personnel or a qualified person trained in maintenance to prevent 
electric shock, when the servo amplifier is powered on.
- When the need arises for an operator to open the door of the power magnetics cabinet and 
perform an operation, ensure that the operator is sufficiently educated in safety or that a


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protective cover is added to prevent the operator from touching any dangerous part.
- The servo amplifier contains a large-capacity electrolytic capacitor in it and remains charged for 
a while after the power is shut off. Before touching the servo amplifier for maintenance or some 
other purpose, measure the residual voltage of the DC link connection using a tester and check 
that the red LED for indicating charging is in progress is not lit, in order to ensure safety.


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- After wiring, be sure to close the servo amplifier cover. 
- A loose screw or poor connector contact can cause a motor malfunction or overheating, 
connection to ground, or short-circuit. Be extremely careful with power supply lines, motor 
power lines, and DC link connections through which a large electric current flows, because a 
loose screw or poor connector contact may lead to a fire. Tighten screws and connectors using the 
specified screw tightening torque.


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MOTOR/DETECTOR/AMPLIFIER 
PREVENTIVE MAINTENANCE 
1.MOTOR/DETECTOR/AMPLIFIER 
PREVENTIVE MAINTENANCE 
- The surfaces of the regenerative discharge unit and heat radiator may become very hot. Do not 
touch them directly by hand.
• When operating the machine for the first time after preventive maintenance, check 
that the machine operates as instructed. 
- To check whether the machine operates as instructed, first specify a small value for the motor and


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then increase the value gradually. If the motor operates abnormally, perform an emergency stop 
immediately. 
- When pressing the emergency stop button, check that the motor stops immediately and that the 
power being supplied to the amplifier is shut off by the magnetic contactor. 
• Notes on alarms 
- If the machine stops due to an alarm, check the alarm number. Depending on the alarm issued, if 
the power is supplied without replacing the failed component, another component may be


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damaged, making it difficult to identify the original cause of the alarm. 
- Before resetting an alarm, ensure that the original cause of the alarm has been removed. 
• If the motor causes any abnormal noise or vibration while operating, stop it 
immediately. 
- Using the motor in spite of the abnormal noise or vibration may damage the servo amplifier. 
 
• Do not disassemble or modify a servo amplifier.


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Do not disassemble or modify a servo amplifier in any way not specified by FANUC; doing so can 
lead to a failure. 
 CAUTION 
• Notes on servo amplifier replacement and wiring 
- The work of servo amplifier replacement and wiring should be carried out by a person trained in 
the maintenance of the machine and equipment concerned.
- When replacing a servo amplifier, check that the combination of the amplifier and the motor is 
appropriate.


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appropriate.
- Check that the servo amplifier is securely mounted on the power magnetics cabinet. If there is 
any clearance between the power magnetics cabinet and the surface on which the amplifier is 
mounted, dust entering the gap may hinder the normal operation of the servo amplifier. 
- Ensure that the power supply lines, motor power lines, and signal lines are each connected to the 
correct terminal or connector.


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correct terminal or connector.
- Unless otherwise instructed, do not unplug a connector and plug it back with the power on; doing 
so may cause the servo amplifier to fail.
- When mounting or unmounting the servo amplifier, exercise care not to get your fingers caught 
between the servo amplifier and power magnetics cabinet.
- Take care not to lose track of removed screws. Turning on the power with any lost screw left in 
the unit may damage the machine.


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- Exercise care to prevent the power supply lines and motor power lines from being connected to 
the ground or being short-circuited.
- Protect the lines from any stress such as bending. Handle the line ends appropriately.
• Be careful about the handling of a servo amplifier. 
- Do not disassemble a servo amplifier. Doing so poses the risk of electric shock, because the 
capacitor may remain charged.
- Do not apply shock to a servo amplifier. Doing so may damage its components, potentially


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B-65425EN/02
- 142 - 
MOTOR/DETECTOR/AMPLIFIER 
PREVENTIVE MAINTENANCE 
1.MOTOR/DETECTOR/AMPLIFIER 
PREVENTIVE MAINTENANCE 
- Do not apply an excessively large force to plastic parts. If a plastic section breaks, it may damage 
internal parts, thus hindering normal operation or leading to a risk of injury due to a broken 
section. 
• Be careful about the operating environment of a servo amplifier. 
- Prevent conductive, combustible, or corrosive foreign matter, mist, or drops of water from


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entering the inside of the unit. The entry of any such material may cause the unit to explode, 
break, malfunction, etc. 
- Exercise care to prevent cutting fluid, oil mist, cutting chips, or other foreign matter from 
attaching to the radiator or fan motor exposed to the outside of the power magnetics cabinet. 
Otherwise, the servo amplifier may become unable to meet its specifications. The service lives of 
the fan motor and semiconductors can also be reduced.


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• Clean the heat sink and fan motor on a regular basis. 
- Replace the filter of the power magnetics cabinet on a regular basis. 
- Before cleaning the heat sink, shut down the power and ensure that the temperature of the heat 
sink is as cool as the room temperature. The heat sink is very hot immediately after power 
shutdown, touching it may cause burn injury. 
- When cleaning the heat sink by blowing air, be careful about dust scattering. Conductive dust


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attached to the servo amplifier or its peripheral equipment can lead to a failure. 
NOTE 
• Make sure that there is sufficient maintenance clearance around the doors of the 
machine and equipment. 
• Do not step or sit on the servo amplifier, or do not apply shock to it. 
• Do not remove a nameplate from a motor. 
- The nameplate is necessary to identify the servo amplifier during maintenance work. 
- If a nameplate comes off, be careful not to lose it. 
NOTE


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NOTE 
1 This manual is focused on the preventive maintenance work to be performed for a 
FANUC servo amplifier. The information contained herein may not apply 
depending on the type or configuration of the machine. When reading this manual, 
refer to the manual of the machine as well. If you have any questions or doubts, do 
not act on your own; please contact the machine tool builder or FANUC. 
2 For detailed information about a servo amplifier, see the manual list shown earlier


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B-65425EN/02 
- 143 - 
MOTOR/DETECTOR/AMPLIFIER 
PREVENTIVE MAINTENANCE 
1.MOTOR/DETECTOR/AMPLIFIER 
PREVENTIVE MAINTENANCE 
1.3.2 Preventive Maintenance of a Servo Amplifier 
To use a servo amplifier safely throughout its entire service life, perform daily and periodic inspections. 
 CAUTION 
1 The preventive maintenance method differs from machine to machine in many 
respects. Depending on the machine in use, it may be difficult for the user to


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perform periodic inspection or cleaning. If you are not sure about anything as to 
preventive maintenance, consult with the machine tool builder and ensure that you 
can perform periodic inspection and cleaning. 
2 The machine should be used within the scope of specification defined by the 
machine tool builder. Using the machine in any way that is outside the specified 
scope can reduce the servo amplifier's service life or cause a failure. 
Inspection Inspection interval


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part Inspection item Routine Periodic Judgment criterion 
Ambient 
temperature V Around the power magnetics cabinet: 0°C - 45°C 
Inside the power magnetics cabinet: 0°C - 55°C 
Humidity V 90% or below RH (dew condensation not allowed)
Dust/oil mist V There shall be no dust or oil mist attached near the 
servo amplifier. 
Cooling air path V The cooling fan shall be operating normally without 
the air flow being interrupted. 
Abnormal 
vibration/noise V


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Abnormal 
vibration/noise V 
- No abnormal noise or vibration shall be present 
that has not been experienced in the past. 
- Vibration near the servo amplifier shall be 0.5 G 
or less. 
Operating 
environment 
Supply voltage V 200-V input type: Within 200 - 240 V 
380-V input type: Within 400 - 480 V 
General V There shall be no abnormal noise or smell, and 
there shall be no dust or oil mist attached. 
Screw V There shall be no loose screw. 
Fan motor (NOTE 1, 2) V


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Fan motor (NOTE 1, 2) V 
- There shall be no abnormal vibration or noise, 
and the fan blades shall be rotating normally. 
- There shall be no dust or oil mist attached. 
Connector V There shall be no loose or broken connector. 
Servo 
amplifier 
Cable V There shall be no sign of overheating or sheath 
deterioration (discoloration pr crack). 
CNC Absolute (NOTE 2)
Pulse coder battery V 
The machine operator's panel or screen shall not 
display the alarm indicating the battery voltage of


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the absolute Pulsecoder is low. 
Magnetic contactor V The contactor shall not rattle or chatter. 
Ground fault 
interrupter V The interrupter shall be able to trip. External 
equipment 
AC reactor V There shall be no hum. 
NOTE 
1 Fan motors are periodic-replacement parts. It is recommended to inspect fan 
motors on a routine basis and replace them in a preventive manner. 
2 Fan motors and batteries are periodic-replacement parts. It is recommended to 
keep spare parts.


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B-65425EN/02
- 144 - 
MOTOR/DETECTOR/AMPLIFIER 
PREVENTIVE MAINTENANCE 
1.MOTOR/DETECTOR/AMPLIFIER 
PREVENTIVE MAINTENANCE 
1.3.3 Maintenance of a Servo Amplifier 
1.3.3.1 Display of the servo amplifier operation status 
The STATUS LEDs on the front of the servo amplifier indicate the operation status of the servo amplifier 
(whether it is operating normally, the type of alarm, etc.). Use these LEDs for maintenance, inspection, 
troubleshooting, etc. 
 CAUTION


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CAUTION 
 A servo amplifier failure may arise from a combination of multiple causes, in which 
case it can be difficult to identify all those causes. Handling the failure in an 
improper way may worsen the problem. It is therefore important to analyze the 
failure status minutely and identify the true cause or causes of the failure. There 
may be cases in which the failure appears to have been fixed but later recurs or 
cause a more serious trouble. If you are not sure about the root cause of or


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corrective action for a failure, do not act on your own; please contact the machine 
tool builder or FANUC for instructions on proper action. 
(1) βiSV-B: See Chapter 4, “CONFIRMATION OF THE OPERATION” in Part I, “START-UP 
PROCEDURE FOR βiSV-B.” 
(2) βiSVSP-B: See Chapter 4, “CONFIRMATION OF THE OPERATION” in Part III, “S START-UP 
PROCEDURE FOR βiSVSP-B.” 
1.3.3.2 Replacement of a fan motor 
(1) βiSV-B: See Section 4.1, “REPLACEMENT OF A FAN MOTOR” in Part II, 
“TROUBLESHOOTING FOR βiSV-B.”


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“TROUBLESHOOTING FOR βiSV-B.” 
(2) βiSVSP-B: See Section 4.1, “REPLACEMENT OF A FAN MOTOR” in Part IV, 
“TROUBLESHOOTING FOR βiSVSP-B.” 
1.4 REPLACING BATTERY FOR ABSOLUTE PULSECODERS 
(1) βiSV-B: See Section 4.2, “REPLACING BATTERY FOR ABSOLUTE PULSECODERS” in Part II, 
“TROUBLESHOOTING FOR βiSV-B.” 
(2) βiSVSP-B: See Section 4.2, “REPLACING BATTERY FOR ABSOLUTE PULSECODERS” in Part 
IV, “TROUBLESHOOTING FOR βiSVSP-B.”


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B-65425EN/02 MOTOR MAINTENANCE 
- 147 - 
1.SERVO MOTOR 
MAINTENANCE
1 SERVO MOTOR MAINTENANCE 
1.1 SERVO MOTOR MAINTENANCE PARTS 
1.1.1 Pulsecoder 
The following lists the ordering specification numbers for maintenance. 
(1) Pulsecoder: ordering specification 
Motor model Motor specification Pulsecoder: ordering specification 
βiS-B series 
βiF-B series 
A06B-2aaa-BccX 
A06B-2aaa-BccX #0100 X=3 A860-2070-T321 βiA1000 
Standard 
specification IP67 
specification 
Common


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specification 
Common 
βiSc-B series A06B-2aaa-BccX 
A06B-2aaa-BccX #0100 X=7 A860-2070-T371
βiA1000 
(dedicated to the 
βiSc-B) 
Standard 
specification IP67 
specification 
Common 
(aaa, cc : Any) 
 
Motor model Motor specification Pulsecoder: ordering specification 
A06B-0aaa-BccX X=3 A860-2020-T301 βiA128 Standard 
βiS series specification 
βiF series 
A06B-0aaa-BccX #0100 X=3 A860-2020-T321 βiA128 IP67 specification 
A06B-0aaa-BccX X=7 A860-2020-T361
βiA128 
(dedicated to the


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βiA128 
(dedicated to the 
βiSc) 
Standard 
specification 
βiSc series 
A06B-0aaa-BccX #0100 X=7 A860-2020-T371
βiA128 
(dedicated to the 
βiSc) 
IP67 specification 
(aaa, cc : Any) 
(2) Oldham's coupling: ordering specification 
Motor model Motor specification Oldham's coupling: ordering specification 
βiS-B series 
βiSc-B series 
βiF-B series 
A06B-2aaa-BccX 
βiS series 
βiSc series 
βiF series 
A06B-0aaa-BccX 
A290-0501-V535 
(aaa, cc, X : Any) 
NOTE


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(aaa, cc, X : Any) 
NOTE 
 Problems concerning the Pulsecoders of the motors listed in the table below 
require the maintenance (replacement) of the entire motor. 
 (It is not possible to maintain the Pulsecoder alone.)


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MOTOR MAINTENANCE B-65425EN/02
- 148 - 
1. SERVO MOTOR 
MAINTENANCE 
Motor model Motor specification Remark 
βiS 0.2/5000 A06B-0111-Bcc3#dddd 
βiS 0.3/5000 A06B-0112-Bcc3#dddd 
Frame size 40 
βiS 0.4/5000 
βiS 0.4/5000-B 
A06B-0114-Bcc3#dddd 
A06B-2114-Bcc3#dddd 
βiS 0.5/6000 
βiS 0.5/6000-B 
A06B-0115-Bcc3#dddd 
A06B-2115-Bcc3#dddd 
βiS 1/6000 
βiS 1/6000-B 
A06B-0116-Bcc3#dddd 
A06B-2116-Bcc3#dddd 
Frame size 60 
(cc, dddd : Any)


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B-65425EN/02 MOTOR MAINTENANCE 
- 149 - 
2.SPINDLE MOTOR 
MAINTENANCE PARTS
2 SPINDLE MOTOR MAINTENANCE PARTS 
2.1 SPINDLE MOTOR MAINTENANCE PARTS 
(1) Parts of the terminal box (βiI, βiIP, and βiIC series) 
Model Terminal box assembly Lid of terminal box 
βiI 3/12000, βiI 6/12000 
βiIC 3/6000, βiIC 6/6000 A290-1404-T400 A290-1402-V410 
βiI 8/12000 to βiI 15/8000 
βiIP 8/6000 to βiIP 30/8000 
βiIC 8/6000 
A290-1406-T400 A290-1406-V410 
sβi IP 40/6000 A290-1410-T400 A290-1410-V410


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(2) Parts of the terminal box (βiIT series) 
Model Terminal box assembly Lid of terminal box 
βi IT 12/10000、βi IT 15/8000 A290-1406-T400 A290-1406-V410 
(3) Fan motor parts (βiI, βiIP, and βiIC series) 
Model Fan assembly (*1) Fan cover Fan motor Exhaust 
direction
βiI 3/12000, βiI 6/12000 A290-1404-T500 A290-1404-X501 A90L-0001-0538/R Rear 
βiIC 3/6000, βiIC 6/6000 A290-1404-T501 A290-1404-X501(*2) A90L-0001-0538/F Front


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βiI 8/12000 to βiI 12/10000 A290-1406-T500 A290-1406-X501 A90L-0001-0515/R Rear 
βiIP 8/6000, βiIP 12/6000 
βiIC 8/6000 A290-1406-T501 A290-1406-X501(*2) A90L-0001-0515/F Front 
βiI 15/8000 A290-1408-T500 A290-1408-X501 A90L-0001-0548/R Rear 
βiIP 15/6000 to βiIP 30/8000 A290-1408-T501 A290-1408-X501(*2) A90L-0001-0548/F Front 
A290-1412-T510 A290-1412-X502 A90L-0001-0554/RW Rear βiIP 40/6000 
A290-1412-T511 A290-1412-X502(*2) A90L-0001-0554/FW Front 
NOTE


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NOTE 
1 These drawing numbers include fan motors. 
2 Performing maintenance on the fan covers only requires the label indicating the 
rotation direction (A370-1204-0006). 
(4) Fan motor parts (βiIT series) 
Model Fan assembly (*1) Fan cover Fan motor 
βi IT 12/10000 A290-1466-T500 A290-1406-X501 A90L-0001-0515/RL 
βi IT 15/8000 A290-1469-T500 A290-1408-X501 A90L-0001-0548/RL 
NOTE 
1 These drawing numbers include fan motors.


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B-65425EN/02 INDEX
i-1 
INDEX 
<A> 
A specified speed cannot be obtained. ...........................73 
About the spindle control and spindle status signals......79 
ALARM NUMBERS AND BRIEF DESCRIPTIONS 
...............................................................................18,88 
Alarms for built-in detectors (αi and βi Pulsecoders) and 
troubleshooting actions............................................137 
Alarms for separate detectors and troubleshooting


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actions ......................................................................137 
Alarms Related to Pulsecoder and Separate Serial 
Detector ......................................................................29 
Amplifier group number.................................................61 
An overshoot or hunting occurs. ....................................74 
Appearance inspection of the linear motor (magnet 
plate).........................................................................136


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Automatic Spindle Parameter Initialization ...................66 
<B> 
Battery connection modes.......................................45,118 
<C> 
Caution.................................................... s-11,s-13,s-4,s-9 
Check Procedure ............................................................10 
Checking the STATUS 2 Indicator ................................81 
Checking the Voltage and Capacity of the Power.......7,59 
CONFIGURATIONS..................................................4,56


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CONFIRMATION OF THE OPERATION ..............10,68 
Connecting a Protective Ground .................................8,60 
CONNECTING THE POWER ...................................7,59 
Connector and STATUS LED Locations .......................68 
Converter: Control Power Supply Undervoltage............23 
Converter: DC Link Overvoltage...................................22 
Converter: DC Link Undervoltage .................................21


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Converter: Excessive Deceleration Power .....................22 
Cutting power weakens or acceleration/deceleration 
slows down.................................................................74 
<D> 
DEFINITION OF WARNING, CAUTION, AND 
NOTE ........................................................................s-2 
Detailed troubleshooting methods................................138 
Diagnosis Screen............................................................26


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Display of the servo amplifier operation status............144 
<E> 
Example of observing data.............................................80 
<F> 
FANUC AC SERVO MOTOR βi-B/βi series, FANUC 
AC SPINDLE MOTOR βi series..............................s-3 
FANUC SERVO AMPLIFIER βi-B series ...................s-8 
Feedback Disconnected Alarm.......................................28 
FOR Series 0i/0i Mate-D................................................19


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FOR Series 30i/31i/32i/35i-B, Power Motion i-A, 0i-F .18 
FOR Series 30i/31i/32i-A...............................................18 
FSSB Communication Error ..........................................25 
Fuse Locations ........................................................52,123 
<H> 
How to Replace the Fuses and Printed Circuit Boards49,121 
How to Switch the Trouble Diagnosis Guidance and 
Trouble Diagnosis Monitor to the "SAMPLING"


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State..........................................................................109 
<I> 
INITIALIZING PARAMETERS...................................61 
INITIALIZING PARAMETERS (SWITCHES AND 
DUMMY CONNECTORS) .........................................8 
INITIALIZING SETTINGS ............................................9 
Invalid Servo Parameter Setting Alarm..........................29 
Inverter: Cooling Fan Stopped of the Radiator ..............23


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Inverter: Internal Cooling Fan Stopped..........................23 
Inverter: IPM Alarm.......................................................23 
Inverter: IPM Alarm (OH) .............................................24 
Inverter: Motor Current Alarm.......................................24 
βiSVSP-B Power Supply Section .............................61,71 
βiSVSP-B Servo Section................................................62 
βiSVSP-B SERVO UNIT ..............................................81


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βiSVSP-B Spindle Section.............................................65 
βiSVSP-B SPINDLE UNIT ...........................................72 
<L> 
LIST OF MANUALS RELATED TO MOTORS AND 
AMPLIFIERS...........................................................128 
List of spindle data that can be observed using the 
SERVO GUIDE .........................................................78 
<M> 
Main inspection items ..................................................131


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Maintenance of βiS servo motor (40 and 60) 
Pulsecoders...............................................................139 
Maintenance of a Detector ...........................................136 
Maintenance of a Servo Amplifier...............................144 
MAJOR COMPONENTS ...........................................5,57 
Method for Observing Motor Current.......................14,83 
MOTOR/DETECTOR/AMPLIFIER PREVENTIVE 
MAINTENANCE.....................................................127


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<N> 
Note............................................................... s-10,s-14,s-6 
Notes on attaching connectors ................................47,120 
Notes on motor cleaning ..............................................134 
Notes on Replacing a Battery (Supplementary 
Explanation) ........................................................45,118 
Notes on the cutting fluid (informational)....................134 
<O> 
Observing Data Using the SERVO GUIDE...................78


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Other Alarms..................................................................31 
OUTLINE OF βiSVSP-B...............................................68 
Overheat Alarm..............................................................28


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INDEX B-65425EN/02
i-2 
Overload Alarm (Soft Thermal, OVC)...........................27 
OVERVIEW ....................................3,17,42,55,78,87,114 
<P> 
Parameter setting for specifying the PS control axis......62 
Parameters Related to Spindle Serial Output .................65 
Periodic cleaning of a motor ........................................134 
PREFACE .................................................................... p-1


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Preventive Maintenance of a Linear Motor..................135 
Preventive Maintenance of a Motor (Common to All 
Models).....................................................................131 
Preventive Maintenance of a Servo Amplifier .............143 
PREVENTIVE MAINTENANCE OF MOTORS AND 
DETECTORS...........................................................129 
PREVENTIVE MAINTENANCE OF SERVO 
AMPLIFIERS...........................................................140


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PS control axis ...............................................................61 
Pulsecoder ....................................................................147 
<R> 
Removing the Fan Motor from the Fan Unit................113 
Removing the Fan Motor from the Fan Unit 
(βiSV40/40-B)............................................................40 
Removing the Fan Motor from the Fan Unit (βiSV40-B, 
βiSV80-B, βiSV10HV-B, βiSV20HV-B,


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βiSV40HV-B, βiSV20/20-B) .....................................39 
Removing the Fan Motor from the Fan Unit (βiSV4-B, 
βiSV20-B) ..................................................................38 
Removing the Fan Unit ................................................111 
Removing the Fan Unit of βiSV40/40-B........................36 
Removing the Fan Unit of βiSV4-B or βiSV20-B .........34 
Removing the Internal Cooling Fan Unit of βiSV40-B, 
βiSV80-B, βiSV10HV-B, βiSV20HV-B,


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βiSV40HV-B, or βiSV20/20-B ..................................35 
Removing the Radiator Cooling Fan Unit of βiSV80-B 
or βiSV40HV-B..........................................................37 
REPLACEMENT OF A FAN MOTOR...........34,111,144 
Replacing Batteries .................................................42,115 
REPLACING BATTERY FOR ABSOLUTE 
PULSECODERS ..........................................42,114,144 
REPLACING SERVO AMPLIFIER COMPONENTS


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.............................................................................33,110 
Replacing the Batteries in a Separate Battery Case.43,115 
Replacing the Battery Built into the Servo Amplifier 
.............................................................................43,116 
Replacing βiS 0.2 to βiS 0.3 batteries .....................47,119 
Routine Inspection of a Spindle Motor with a Through 
Hole ..........................................................................135 
<S>


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<S> 
SAFETY PRECAUTIONS ...........................................s-1 
Selecting the Ground Fault Interrupter That Matches the 
Leakage Current ......................................................8,61 
Servo Adjustment Screen ...............................................25 
Servo Alarm .........................................................18,19,88 
Servo Amplifier................................................................5 
SERVO AMPLIFIER MODULE..............................10,21


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SERVO CONTROL SOFTWARE.................................25 
SERVO MOTOR MAINTENANCE ...........................147 
SERVO MOTOR MAINTENANCE PARTS..............147 
Servo parameter initialization procedure .......................62 
Specifications of Fan Units and Motors for Maintenance
..................................................................................114 
Specifications of Fan Units for Maintenance .................41


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SPINDLE ALARM........................................................92 
SPINDLE MOTOR MAINTENANCE PARTS...........149 
Start-up of an individual servo axis................................63 
START-UP PROCEDURE....................................6,58,70 
START-UP PROCEDURE (OVERVIEW) ................6,58 
STATUS 1 Indicator......................................................72 
Status Error Indication Function ....................................74 
<T>


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<T> 
The motor does not turn. ................................................73 
The STATUS 1 indicator is blinking with "--." .............73 
The STATUS LED Is Off. .............................................71 
TROUBLE DIAGNOSIS FUNCTION..........................96 
Trouble Diagnosis Guidance..........................................97 
Trouble Diagnosis Monitor..........................................102 
TROUBLESHOOTING AND ACTION...................21,95


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Troubleshooting at Startup.............................................73 
Troubleshooting Procedure ............................................95 
TROUBLESHOOTING PROCEDURES ......................95 
<V> 
V Ready-off Alarm Indicated on the CNC Screen....12,81 
<W> 
Warning ...................................................s-11,s-12,s-3,s-8 
Warnings and Cautions Relating to a Pilot Run..........s-11 
Warnings and Cautions Relating to Maintenance .......s-12


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Warnings and Cautions Relating to Mounting ..............s-8 
Warnings, Cautions, and Notes on Operation of Servo 
Amplifiers ................................................................140 
Warnings, Cautions, and Notes on Preventive 
Maintenance of Motors and Detectors.....................129 
When cutting is not performed, the spindle vibrates, 
making noise. .............................................................73


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B-65425EN/02 REVISION RECORD
r-1 
REVISION RECORD 
Edition Date Contents 
02 Jul., 2015 
 - Change of the title to FANUC AC SERVO MOTOR βi-B/βi series 
 - Addition of models to the βiSVSP-B series lineup (180-mm width models and 400-V input 
models) 
01 Nov., 2014


