ACS 400 User’s Manual147Figure 71 The control signal connections of the Pump and Fan Control (PFC) macro.PID ControllerThe ACS 400 has an internal PID controller which is in use when PFC control macro is selected.Key features of the PID controller are:• PID sleep function to stop the regulation when the output of PID controller falls below presetlimit; recovery when the process actual value falls below preset limit.• Programmable sleep and wake-up delays. Sleep mode can also be activated through a digitalinput.• Two PID parameter sets, selectable through a digital input.• PID controller parameters are in groups 40 and 41.ControlTerminalsAnalogueinputsEXT REF2SELECT1106EXT REF 1SELECT1103EXT1/ EXT 2SEL1102CONSTSPEED SEL1201AI1 EXT 1EXT 2KEYPADAI1 RemoteKEYPADLocalRemoteLocalConst.speedsMin freqMax freqCrit. sp.Acc/DecKEYPADREF SEL1101DigitalinputsDI1-DI5KeypadRefLoc/RemREF 2 (%)REF 1 (Hz)Start/Stop, DirectionNOT SELDI1KEYPADKEYPADEXT 1EXT 2LocalRemoteREQUESTFORWARDREVERSEStart/StopDirectionRUN ENABLEDIRECTIONEXT 2COMMANDS1002EXT 1COMMANDS1001NOT SEL1003 1601AI1AI2AI1AI2ACT 2ACT 1ACTUALVAL SEL4006ACTUAL 1INPUT SEL4007ACTUAL 2INPUT SEL4008PIDDI1...5NOT SELDI4PFC+
