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ErrorLib — Industrial Fault Code Library

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0434

Velocity Loop Integral Gain Overflow

Fanuc · Alpha i Series Servo Amplifier

What does 0434 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.
  • Persistent steady-state error in velocity control.
  • Incorrect tuning of velocity integral gain (P04-11).
  • External disturbance requiring excessive integral correction.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Decrease the value of the velocity loop integral gain parameter.

Browse all codes in this manual (101)
Verified technical data. Last updated: April 2026

Related Faults

0233Velocity Pulse Count Exceeded0243Position Pulse Count Exceeded0435Velocity Loop Integral Gain Overflow
Source: Fanuc Alpha i Series Servo Amplifier
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