4503

Weighting of the velocity pre-control not allowed

Beckhoff · TwinCAT 2 NC

What does 4503 mean?

The value specified for the percentage weighting of the velocity pre-control is not allowed, as it must be within the range [0.0 ... 1.0]. This parameter, typically preset to 1.0 (100%), influences the feedforward control of velocity. An invalid value can lead to poor motion tracking, instability, or overshoots/undershoots.

Complete Troubleshooting Guide

  1. 1

    Verify the velocity pre-control weighting parameter in the NC configuration for the controller.

  2. 2

    Ensure the value is within the allowed range of 0.0 to 1.0 (inclusive).

  3. 3

    Set the parameter to 1.0 if default feedforward behavior is desired, or tune carefully if custom values are needed.

  4. 4

    Save configuration changes and restart the NC system.