Yaskawa Sigma II Series Servo System - Manual (Page 400)

Sigma II User’s Manual Chapter 9: Inspection, Maintenance, and Troubleshooting
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A.41
A.41: Main Circuit DC Voltage Error Detected: Undervoltage
Display and Outputs
Note: OFF: Output transistor is OFF (alarm state).
ON: Output transistor is ON.
Status and Remedy for Alarm
Alarm Outputs
Alarm Code Output
ALM Output
ALO1 ALO2 ALO3
OFF OFF ON OFF
Cause of the Problem Solution
A
The power supply voltage
exceeds specified range.
Check power supply voltage.
B Fuse blown.
Replace servo amplifier. C Defective rectifying diode.
D Defective servo amplifier.
A, B, C D
A, B, C
During servomotor
operation.
When main circuit
power is turned ON.
When control power
is turned ON.