Cause : Auto tuning speed feedback fault comes when only during rotating auto-tuning and means the drive couldn't verify motor speed during the test run.

E20.00 fault in the Inovance IS580 drive means “Auto-tuning Speed Feedback Fault”. This means the drive tried to perform rotating auto-tuning, but it didn’t receive valid speed feedback from the encoder or internal estimation.

1. Encoder is not matched.
2. Set the type of encoder correctly.
3. Encoder wiring is incorrect.
4. Check the PG card power supply and phase sequence.
5. Encoder is damaged.
6. Replace encoder
7. PG card is abnormal.
8. Replace PG card.