F0789 fault in WEG CFW701 Drive indicates a High Level of the External PID 1 Process Variable. This means the external PID feedback sensor remained above the safe threshold, triggering a system fault.
Cause:
Parameter P1075 is programmed in 2 and the External PID controller 1 feedback value is remaining above the value programmed in P1078 for the time programmed in P1079.
Remedy:
Verify that the process pressure, level, or variables are within expected system parameters. Check the sensor output and parameter values for P1075, P1078, and P1079.
