PXR3 Instruction Manual - Coulton Instrumentation

7 Reference [About the self-tuning method]The PID constant is calculated in one of the following two methods.The method is selected automatically depending on the characteristics of the device to be controlled.• Step response method• Limit cycle methodThe following figures show the operations at power-on and changing the SV, and under unstable control.q Operations at power-onStep response methodLimit cycle methodSVPVSVPVDuring tuningTimeDuring tuningTimew Operations at changing the SVStep response methodLimit cycle methodSVPVChanging the SVSVPVChanging the SVDuring tuningTimeDuring tuningTimee Operation under unstable controlLimit cycle methodPVUnstable control During tuningSVTime100%MV30