Watlow Series 922 User's Manual - Heaters Sensors Controls

Programming TuningChapter 5How to Tune the Series 922This chapter will explain tuning the 922 to the system it controls.Recommended Tuning ReferenceThere are a number of quality references on the art of tuning electroniccontrollers to the systems they control. If you are not an instrument technicianqualified to tune thermal systems, we suggest that you obtain and becomefamiliar with the reference below before attempting to tune your system.Remember that the time you spend tuning your system is relative to the qualityof control you need.Tuning of Industrial Control SystemsArmando B. CorripioPublished by the Instrument Society of AmericaUsing A Chart RecorderThe tuning procedure will be greatly simplified if you use a chart recorder toassist in tuning the Series 922. Connect the chart recorder to the analogretransmit signal.The analog retransmit signal provides a chart recorder output represented byC1 or C2 (Actual process variable), or SP1 or SP2 (Set Point temperature).The user selectable scaling factors are 1, 2, 5, or 10mV per least significantdigit.If you don't have a chart recorder available, you can still plot the time vs.temperature system response. Record the 922's ACTUAL display readings ongraph paper with an x, y axis to accomplish the same thing.36 WATLOW Series 922 User's ManualHow To Tune and Run the Series 922, Chapter 5