Omron OMNUC W Series Manual page 240

A.C6
A.C6: Fully-closed Encoder Phase-A, -B Disconnection
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.
9-29
9.3 Troubleshooting with Alarm Displays
ALM Output
ALO3
ON OFF
1 to 3 seconds after
A
power ON
A, B,
C, D
Replace the Servo Driver.
Check the wiring and check that the connec-
tor is fully inserted on the encoder.
Separate the encoder wiring from the main
circuit.
Replace the Servomotor.
A, B,
C, D
Remedy
9