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
Correct the setting of the observer parameter to (-1) × (desired value)/10.
Verified technical data. Last updated: March 2026
Related Faults
Source: Fanuc Alpha i Series Servo Amplifier