Cause : Autotuning fault comes when the drive encountered an issue while performing the autotuning process. This fault can occur if the drive cannot successfully complete the tuning procedure.

"F028" fault in Schneider ATV310 drive indicate an Autotuning Fault. This fault occurs during the autotuning process, which is used to optimize the drive's performance for a specific motor and load.

Possible Causes:

1. Incorrect Motor Data: The motor parameters entered into the drive may be incorrect.
2. Motor Not Connected Properly: Issues with the motor connections can prevent successful autotuning.
3. Load on Motor: The motor should be unloaded during the autotuning process.
4. Drive Configuration Errors: Incorrect configuration of drive parameters related to autotuning.
5. Motor Faults: There may be issues with the motor itself, such as internal faults or damage.

Troubleshooting Steps:

1. Verify Motor Data: Ensure that all motor parameters (such as rated voltage, current, frequency, and power) are correctly entered into the drive.
2. Check Motor Connections: Verify that the motor is properly connected to the drive and that all connections are secure and correct.
3. Unload the Motor: Make sure that the motor is not under load during the autotuning process.
4. Review Drive Configuration: Check the drive configuration to ensure all settings related to autotuning are correct.
5. Inspect the Motor: Look for any signs of motor faults or damage that could interfere with the autotuning process.