0435

Velocity Loop Integral Gain Overflow

Fanuc · Alpha i Series Servo Amplifier

What does 0435 mean?

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

Common Causes

  • Integral term in the velocity control loop has exceeded its maximum allowable value.
  • Sustained difference between commanded and actual velocity.
  • Improper velocity loop integral gain setting (P04-11).
  • Load torque variations beyond control limits.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Decrease the value of the velocity loop integral gain parameter.

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Verified technical data. Last updated: March 2026

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Source: Fanuc Alpha i Series Servo Amplifier