Watlow Series 922 - Manual (Page 36)

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WATLOW Series 922 User's Manual
Programming
How To Tune and Run the Series 922, Chapter 5
Tuning
Recommended Tuning Reference
There are a number of quality references on the art of tuning electronic
controllers to the systems they control. If you are not an instrument technician
qualified to tune thermal systems, we suggest that you obtain and become
familiar with the reference below before attempting to tune your system.
Remember that the time you spend tuning your system is relative to the quality
of control you need.
Tuning of Industrial Control Systems
Armando B. Corripio
Published by the Instrument Society of America
Using A Chart Recorder
The tuning procedure will be greatly simplified if you use a chart recorder to
assist in tuning the Series 922. Connect the chart recorder to the analog
retransmit signal.
The analog retransmit signal provides a chart recorder output represented by
C1 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 significant
digit.
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 on
graph paper with an x, y axis to accomplish the same thing.
Chapter 5
How to Tune the Series 922
This chapter will explain tuning the 922 to the system it controls.