Sigma II User’s Manual Chapter 9: Inspection, Maintenance, and Troubleshooting
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A.71, A.72
A.71: Overload: High Load
A.72: Overload: Low Load.
The alarm output, status, and remedy for A.71 are the same as for A.72.
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
ON ON ON OFF
Cause of the Problem Solution
A
Incorrect or disconnected servo-
motor wiring.
Check wiring and connectors at
the servomotor.
B
Load greatly exceeds rated
torque.
Reduce load torque and inertia.
Otherwise, replace with a larger
capacity servomotor.
C Defective circuit board (1PWB). Replace servo amplifier.
When Servo ON (S-ON)
signal is turned ON.
When speed reference
is entered.
At power ON.
C
B
B
A
No servomotor
rotation.
During servomotor
operation.
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