Yaskawa MP940 Reference Manual User 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