0444
Velocity Loop Proportional Gain Overflow
Fanuc · Alpha i Series Servo Amplifier
What does 0444 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.
- Rapid fluctuations in velocity demand.
- Incorrect tuning of velocity proportional gain (P04-10).
- System instability or oscillation.
Repair Steps & Checklist
Click steps to track your progress.
- 1
Use the function for changing the internal format of the velocity loop proportional gain to prevent overflow.
Verified technical data. Last updated: March 2026
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Source: Fanuc Alpha i Series Servo Amplifier