Yaskawa MP940 Reference Manual - Manual (Page 364)

MotionSuite™ MP940 Machine Controller Reference Manual Troubleshooting
10-11
A.40
A.40 is the alarm display for DC overvoltage 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 x
Cause Remedy
A The power supply voltage is not
within the range of specifications. Check power supply.
B Load exceeds capacity of the regen-
erative unit. Check the specifications of load
inertia and overhanging load.
C Regenerative transistor is abnormal. Replace servo amplifier.
D Rectifying diode defective —
E Servo amplifier defective.
—
Alarm occurs with only
brake power ON
E A, B, C, D
A, D
Alarm occurs during motor
operation
Alarm occrs at main
power ON