405
Reference Position Return Error
Fanuc · Alpha i series AC Servo Motor
What does 405 mean?
Reference position return could not be executed correctly. This alarm can be triggered if parameter No. 032 (CMR) is configured with a value within the range of 4 to 96.
Common Causes
- Reference position return procedure not completed successfully.
- Parameter No. 032 (CMR) is set to a value between 4 and 96.
Repair Steps & Checklist
Click steps to track your progress.
- 1
Re-execute the reference position return procedure.
- 2
If parameter No. 032 (CMR) is set between 4 and 96, set bit 4 (N405) of parameter No. 001 to '1' to prevent this alarm.
Verified technical data. Last updated: March 2026
Related Faults
Source: Fanuc Alpha i series AC Servo Motor