Controller Tuning Should Have a Purpose! (Booklet and Software)

Before you tune, you should know what you are trying to
do. Are you trying to draw straight lines, ie, minimize
deviations from setpoint? Perhaps there are no serious
upsets and you could be satisfied with settings which
would do as well as a drowsy person would do, controlling
it on manual. Perhaps even, you should use averaging
control, in which the object is to control as loosly as
possible without the controlled variable exceeding safety
limits. Heaven forbid that you are tuning just because
the boss says to go out and tune that loop! Will tuning
really do what you want to do?
For more information you may refer to a booklet
"Controller Tuning and Control Loop Performance, a
Primer" [SECOND EDITION, twice the size of the first],
which is available in the US for $17, postpaid if
prepaid. It has sold 29,934 copies to date. Control
Engineering Magazine has referred to it as "PID Without
the Math".
Information is at
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From this site there is a link to Companion Software ($11).
If you wish, I could e-mail you same information.

David W. St. Clair
Straight-Line Control Co.
Reply to
Dwstclair
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