Requested set velocity is not allowed

What does 4221 mean?

The velocity value requested for a positioning task is invalid, either being zero or negative, exceeding the axis's 'maximum velocity', or, for servo drives, exceeding the axis's 'reference velocity'. An unacceptable velocity can lead to an axis not moving, overspeed conditions, or triggering other safety limits.

Complete Troubleshooting Guide

1. 1

   Check the commanded velocity value in the motion program or PLC logic.

2. 2

   Ensure the requested velocity is a positive value and less than or equal to the configured 'maximum velocity' parameter for the axis.

3. 3

   For servo drives, verify the requested velocity does not exceed the 'reference velocity' parameter in the drive configuration.

4. 4

   Adjust motion parameters or programming to keep commanded velocities within acceptable limits.