F0235 fault in WEG CFW500 Drive indicates a Node Guarding or Heartbeat error. This means the CANopen network timed out before receiving the next expected master telegram, triggering a fault trip.
Cause:
- Mismatched message exchange times between the master and slave.
- Master controller is not sending guarding telegrams within the assigned interval.
- Transmission delays or signal loss on the communication line.
Remedy:
Check times configured on both master and slave. To prevent conflicts, set the slave’s error detection time to be a multiple of the master’s exchange interval. Verify guarding telegram transmission.
