0475

Observer Parameter (POA1) Overflow

Fanuc · Alpha i Series Servo Amplifier

What does 0475 mean?

This invalid parameter setting alarm indicates that the internal calculation value of the observer parameter POA1 has overflowed. This suggests an incorrect setting for the observer parameter, causing internal calculation limits to be exceeded.

Common Causes

  • Observer parameter (POA1) calculation has overflowed.
  • Disturbances affecting observer state prediction.
  • Faulty observer gain tuning (P04-65).
  • Rapid acceleration/deceleration transients.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Correct the setting of the observer parameter to (-1) × (desired value)/10.

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Verified technical data. Last updated: March 2026

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Source: Fanuc Alpha i Series Servo Amplifier