423

Speed Exceeds Limit

Fanuc · Alpha i series AC Servo Motor

What does 423 mean?

This alarm indicates that the specified speed exceeds 32767000 detection units per second. This suggests an incorrect configuration of motion parameters, potentially leading to instability or performance issues.

Common Causes

  • Speed setting (CMR) is too high
  • CMR (Compound Motion Ratio) setting is incorrect

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Re-examine and adjust CMR settings

  2. 2

    Re-examine and adjust speed settings

Browse all codes in this manual (60)
Verified technical data. Last updated: March 2026

Related Faults

409Unexpected Disturbance Torque Detected400Servo Motor Overheat (Estimated)090Reference Position Setting Error
Source: Fanuc Alpha i series AC Servo Motor
Open Manual (Page 230)Search more codes in this manual