0885

Machine Velocity Feedback Coefficient Overflow

Fanuc · Alpha i Series Servo Amplifier

What does 0885 mean?

This invalid parameter setting alarm indicates that the internal calculation value of the machine velocity feedback coefficient has overflowed. This usually happens if the coefficient is set too high, exceeding internal processing limits.

Common Causes

  • The calculated machine velocity feedback coefficient is too high.
  • A sensor reading related to machine speed has overflowed during coefficient calculation.
  • Parameter P601.2 (Velocity Feedback Coefficient) is set too high.
  • An internal process overflowed during the calculation of the velocity feedback gain.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Decrease the machine velocity feedback coefficient.

  2. 2

    Alternatively, utilize the vibration-damping control function, which offers an equivalent effect.

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Verified technical data. Last updated: March 2026

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Source: Fanuc Alpha i Series Servo Amplifier