Cause : Speed feedback comes when the drive may operate at an incorrect speed, affecting the performance of the system. The drive may lose control of the motor if it cannot accurately measure its speed.

F522 speed feedback fault in ABB DCS800 drive indicates a speed feedback fault. This means that the drive is unable to accurately measure or receive feedback about the motor's speed.

1. Inspect the wiring between the speed sensor and the drive for any signs of damage, loose connections, or corrosion.
2. Test the wiring for continuity using a multimeter.
3. Check for any physical damage, loose connections, or signs of overheating on the drive's control circuitry or communication interface.
4. Test the drive with a different speed sensor to isolate the issue.