F0700 fault in WEG CFW500 Drive indicates a Remote HMI Communication Fault. This means the serial data link to the keypad was broken while the drive was actively relying on it for commands.
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.
