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