the control unit determines that abnormalities have occurred when the current detected by {HEAD ~ the current sensor} exceeds a threshold value set in {TAIL ~ advance} 
the control unit determines that abnormalities have occurred when the current detected by { HEAD ~ the current sensor } exceeds a threshold value set in { TAIL ~ advance }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL