447

High Velocity Deviation

Fanuc · αi series AC Servo Motor

What does 447 mean?

The velocity deviation is too high, indicating a problem in the velocity control loop. This could be due to an actual velocity that does not match the commanded velocity or improper parameter settings, leading to poor motion control.

Common Causes

  • Actual velocity does not match commanded velocity
  • Parameter No.136 is incorrectly set

Repair Steps

  1. 1

    Check the actual velocity

  2. 2

    Verify and adjust the settings of parameter No.136

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