Cause : PI feedback fault comes when PID feedback below lower limit. This typically relates to an issue with the PID, which is essential for regulating motor speed and torque.

"F026" fault in Schneider ATV310 drive indicate "PI feedback" fault. This means there is an issue with the feedback signal used in the PI control loop. This fault can prevent the drive from accurately controlling the motor speed or torque.

Follow these steps to correct the fault:

1. Check Sensors: Verify the proper functioning and connection of the speed and current sensors.
2. Inspect Analog Input: Check the analog input for any signs of damage or malfunction.
3. Review Motor Parameters: Ensure the motor parameters are correctly configured in the drive.