0445

Velocity Loop Proportional Gain Overflow

Fanuc · Alpha i Series Servo Amplifier

What does 0445 mean?

This invalid parameter setting alarm indicates that the internal calculation value of the velocity loop proportional gain has overflowed. This typically occurs when the parameter setting for the proportional gain is excessively high, leading to calculation errors.

Common Causes

  • Proportional term in the velocity control loop has exceeded its maximum allowable value.
  • Sudden changes in motor speed.
  • Inadequate velocity loop proportional gain (P04-10).
  • High frequency noise in velocity feedback.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Use the function for changing the internal format of the velocity loop proportional gain to prevent overflow.

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Verified technical data. Last updated: March 2026

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Source: Fanuc Alpha i Series Servo Amplifier