Yaskawa Sigma II Series Servo System - Manual (Page 397)

Sigma II User’s Manual Chapter 9: Inspection, Maintenance, and Troubleshooting
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A.30
A.30: Regenerative Error Detected
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 OFF OFF
Cause of the Problem Solution
A Malfunctioning regenerative transistor. Replace servo amplifier.
B Regenerative resistor is open.
Replace servo amplifier or regen-
erative resistor.
C
Disconnected regenerative unit
(for an external regenerative resistor).
Check the wiring of the external
regenerative resistor.
D Defective servo amplifier. Replace servo amplifier.
When the control power
About 1s after main circuit
During servomotor
operation. is turned ON.
A, B
A, B, C
D
power is turned ON.