Cause: AFE contactor feedback error comes when the mains contactor feedback is inactive during DC Bus charging phase. The mains contactor feedback becomes inactive without mains phase loss detection while the drive is in operation "Ready or Run state".

"AFE" Contactor Feedback Error in a Schneider ATV950 drive indicates a problem with the Active Front End (AFE) contactor or its feedback signal. This fault means that the drive is not receiving the expected feedback from the AFE contactor, which is crucial for proper operation and safety. Here are steps to troubleshoot and resolve the AFE Contactor Feedback Error:

1. Check AFE Contactor:

• Contactor Operation: Verify that the AFE contactor is operating correctly. Listen for the audible click when the contactor engages.
• Manual Operation: If safe to do so, manually operate the contactor to ensure it can engage and disengage properly.

2. Inspect Feedback Signal:

• Signal Integrity: Check the integrity of the feedback signal from the contactor. Ensure there are no loose connections, breaks, or shorts in the feedback wiring.
• Continuity Test: Use a multimeter to test for continuity in the feedback circuit to ensure proper connection.

3. Verify Wiring and Connections:

• Connections: Ensure all connections to the AFE contactor and its feedback circuit are secure and free from corrosion or damage.
• Correct Wiring: Verify that the wiring matches the drive’s wiring diagram. Incorrect wiring can cause feedback errors.

4. Check Drive Settings:

• Parameter Settings: Verify the drive parameters related to the AFE contactor and feedback. Ensure they are set correctly according to your application and the drive's configuration.
• Factory Reset: If necessary, perform a factory reset of the drive parameters and reconfigure the drive.

5. Inspect Environmental Conditions:

• Temperature and Humidity: Ensure that the drive and contactor are operating within the specified temperature and humidity ranges. Extreme conditions can affect contactor operation.
• Dust and Contaminants: Check for dust, dirt, or other contaminants that might interfere with the contactor or feedback signal.