Conn Lost fault in WEG CFW701 Drive indicates an HMI Communication Failure. This means the keypad has lost connection with the control board, usually due to a bad cable contact or electrical noise.
Cause:
A bad contact in the HMI cable, or electrical noise in the installation, can cause a failure in the communication between the HMI and the control board. In such cases, the operation through the HMI becomes impossible.
Remedy:
Inspect and clean the HMI cable connections. Minimize electrical noise in the installation by rerouting cables or adding shielding.
