F0234 fault in WEG CFW500 Drive

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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.

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