Yaskawa MP940 Reference Manual - Manual (Page 362)

MotionSuite™ MP940 Machine Controller Reference Manual Troubleshooting
10-9
A.30
A.30 is the alarm display for regenerative error detection. The alarm output
appears below.
Note: The indicates the output transistor is ON; the x indicates the output transistor is OFF (alarm
state).
Status when Alarm Occurred
Alarm Output
Alarm Code Output ALM Output
ALO1 ALO2 ALO3
x x
Cause Remedy
A Regenerative transistor is abnormal. Replace servo amplifier.
B Disconnection of the regenerative
resistance unit. Replace servo amplifier or
regenerative resistance unit.
C Regenerative resistor unit discon-
nected (for more than 6.0kW). Check wiring of regenerative
resistor unit.
D Servo amplifier defective. Replace servo amplifier.
Alarm occurs during motor
operation
A, B
Alarm occurs about 1sec
after main power ON
A, B, C
Alarm occurs with only
braking power ON
D