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