Sigma II User’s Manual Chapter 9: Inspection, Maintenance, and Troubleshooting
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A.40
A.40: Main Circuit DC Voltage Error Detected: Overvoltage
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
Power supply voltage is not within
the range of specifications.
Check power supply.
B
Load exceeds capacity of the regen-
erative unit.
Check specifications of load iner-
tia and overhanging load.
C
Malfunctioning regenerative transis-
tor.
Replace servo amplifier.
D Defective rectifying diode.
E Defective servo amplifier.
A, B, C, D E
A, D
During servomotor
operation.
When main circuit
power is turned ON.
When control power
is turned ON.
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