F0234 fault in WEG CFW500 Drive indicates a Bus Off condition on the CAN interface. This means the CAN network experienced severe data collisions or wire shorts and disconnected itself to protect the network.
Cause:
- Short circuit on the CAN circuit transmission cable.
- CAN cables are misconnected or inverted.
- Not all network devices are configured with the same communication baud rate.
- Termination resistors with the right specification were not installed correctly (should only be at the physical ends of the main bus).
- CAN network was improperly installed.
Remedy:
Check CAN high and low wires for short circuits or inverted signals. Match node baud rates across the network. Check termination resistor values and placement.
