Understanding Lags is Essence of Control (Booklet and Software)

Tuning controllers is a matter of matching the time and
amount parameters of the controller to those of the
process. The time parameters of the controller (reset and
derivative) are set in accordance with the natural period
(a time parameter) of the loop. It is a paradox that it
is the smaller lags in the loop which determine the
natural period, not the largest. This is perhaps an
oversimplification, but it is essential to understand why
this is so.
For more information you may refer to a booklet
"Controller Tuning and Control Loop Performance, a
Primer, Second Edition", which is available in the US at the
cash discounted price of $17, postpaid if prepaid. It has
sold 29,663 copies to date. Control Engineering Magazine
has referred to it as "PID Without the Math".
Information is available at
formatting link
There is a link
from there to a page about companion software ($11).
If you wish, I could e-mail you a brochure on either.
David W. St. Clair
Straight-Line Control Co.
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