YASKAWA MECHATROLINK Sigma 2 Series User Manual page 187

9 Troubleshooting
A.C7
A.C7: Fully Closed Encoder Phase-C Disconnection Alarm
Display and Outputs
Alarm Outputs
Alarm Code Outputs
ALO1 ALO2
ON OFF
Note: OFF: Output transistor is OFF (alarm state). ON: Output transistor is
ON.
Status and Remedy for Alarm
At power ON
During servomotor
operation
Cause
A
Circuit board (1PWB) is defective.
B Encoder wiring error or faulty contact.
C
There is noise in the encoder wiring.
D
Encoder is defective.
ALM Output
ALO3
ON OFF
1 to 3 seconds after power
A
ON
A, B,
C, D
Replace the SERVOPACK.
Check the wiring and check that the con-
nector is fully inserted on the encoder
side.
Separate the encoder wiring from the
main circuit.
Replace the servomotor.
9-12
A, B,
C, D
Remedy