Parameters98 M-Max Series Adjustable Frequency Drive MN04020003E—October 2013 www.eaton.comActivating/Deactivating PID ControllerWith a digital input (in FS DI6) configured as PID, PID controlcan be switched on and off through control signal terminals.When you activate the PID input, PID control is disabled. Thefrequency inverter then works with its standard frequencycontrol again.This function is available only when PID control is active(P9.1 = 1).Do not switch the PID controller on and off while thefrequency inverter is in RUN mode (RUN LED is lit).Parameterize one of the digital inputs 1 to 6 as a PID, bysetting the parameter (P3.12 = 1–6) (factory setting(P3.12 = 6).The Activate/Disable PID Control function is optional. If youwant PID control to be active all the time, you only need toset P9.1 = 1.PID-System Deviation (OD)The PID-system deviation (e) is the difference betweenreference and actual value (process variable PV).The digital output configured as OD is activated if a freelyselectable control deviation (P9.17) is exceeded with the PIDcontroller (P9.1 = 1) active. The OD output stays activateduntil this limit value is exceeded.If you wish to configure a parameterizable digital output orsignalling relay as OD, you must set the limit value thatactivates the OD signal when exceeded at P9.17.Action: Then parameterize one of the digital inputs as ODoutput by setting the value 12 at P5.1–P5.3.Function Chart for OD (PID System Deviation)Feedback Value Check Signal (FBV)The FBV (Feedback Value Check) signal is issued when:● The actual value (PV) drops below the lower limit value(P9.16) in RUN mode. It remains active until:● The actual value exceeds the upper limit value (P9.15)● The frequency inverter changes from RUN mode to STOPmode (deceleration with the set ramp time)ItemNumber Description1 Setpoint value2 Actual valueODP9.17P9.1712
