Cause : PID feedback error comes when PID feedback offline. A "PID feedback fault" in "INVT" drive typically refers to an error or issue related to the PID (Proportional-Integral-Derivative) feedback control system used in various control systems, such as in industrial automation, robotics, and process control.

1. Check PID feedback line.

2. Disable PID feedback detection (F8.24=0.0%).

3. Increase PID feedback offline detection time (F8.25).