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CAIRO BOOKS's Description
Practical Process Control (loop tuning and troubleshooting). This book differs
from others on the market in several respects. First, the presentation is
totally in the time domain (the word "LaPlace" is nowhere to be found). The
focus of the book is actually troubleshooting, not tuning. If a controller is
"tunable", the tuning procedure will be straightforward and uneventful. But if
a loop is "untunable", difficulties will be experienced, usually early in the
tuning effort. The nature of any difficulty provides valuable clues to what is
rendering the loop "untunable". For example, if reducing the controller gain
leads to increased oscillations, one should look for possible interaction with
one or more other loops. Tuning difficulties are always symptoms of other
problems; effective troubleshooting involves recognizing the clues, identifying
the root cause of the problem, and making corrections.
Furthermore, most loops are rendered "untunable" due to some aspect of the
steady-state behavior of the process. Consequently, the book focuses more on
the relationship of process control to steady-state process characteristics
than to dynamic process characteristics. One prerequisite to effective
troubleshooting is to "demystify" some of the characteristics of the PID
control equations. One unique aspect of this book is that it explains in the
time domain all aspects of the PID control equation (including as the
difference between the parallel and series forms of the PID, the reset feedback
form of the PID equation, reset windup protection, etc.) The book stresses an
appropriate P&I (process and instrumentation) diagram as critical to successful
tuning. If the P&I is not right, tuning difficulties are inevitable. Developing
and analyzing P&I diagrams is a critical aspect of troubleshooting.