A0700 alarm in WEG CFW500 Drive indicates a Communication Fault with Remote HMI. This means the serial data link to the keypad broke, but no critical frequency references were active at the time.
Cause:
- HMI cable is disconnected.
- Communication interface with the HMI is incorrectly configured in parameter P0312.
Remedy:
Check parameter P0312 to verify that the HMI communication interface is configured correctly. Reconnect or replace the HMI serial cable.
