Error Code Database
Yaskawa Alarm A.C90
Encoder Communications Error
Possible Causes
1. Poor contact in encoder connectors.
2. Broken wire in encoder cable.
3. Faulty receiver chip on the drive.
Recommended Solution
- Reseat the CN2 connector.
- Continuity test the encoder cable.
- If cable is good, the receiver IC on the drive is damaged.
Still seeing Error A.C90?
If the troubleshooting steps above didn't resolve the issue, your Yaskawa hardware likely has a component failure.
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