405

Reference Position Return Error

Fanuc · αi 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

  1. 1

    Re-execute the reference position return procedure.

  2. 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.

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Verified technical data. Last updated: March 2026
Source: Fanuc αi series AC Servo Motor