F0787 fault in WEG CFW500 Drive indicates a Low Level of the External PID Process Variable. This means the external PID feedback sensor remained below the safe threshold, triggering a system fault.
Cause:
Parameter P1075 is programmed for 2, and the process variable of the external PID controller remained below the value programmed in P1076 for the duration set in P1077.
Remedy:
Verify the process feedback loops and verify configurations in parameters P1075, P1076, and P1077.
