F1303 fault in WEG CFW900 Drive indicates a Slot C Accessory Connection Error. This means the drive lost physical or electrical communication with the card installed in Slot C.
Cause:
- High electromagnetic interference/noise levels.
- Vibration levels exceed structural limits causing physical connector faults.
- Accessory card firmware corruption.
Remedy:
Trace electrical grounds and apply EMI shielding where appropriate. Secure physical slot fitment to prevent vibration issues. Re-flash card firmware if corrupted.
