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Category Archives: Process Control Preliminaries

07
Apr 2015
43

The Normal or Standard PID Algorithm

Process Control Preliminaries controlguru

The question arises quite often, “What is the normal or standard form of the PID (proportional-integral-derivative) algorithm?” The answer is both simple and complex. Before we explore the answer, consider the screen displays shown below (click for a large view of example 1 or example 2):

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07
Apr 2015
17

A Controller’s “Process” Goes From Wire Out to Wire In

Process Control Preliminaries controlguru

A controller seeks to maintain the measured process variable (PV) at set point (SP) in spite of unplanned and unmeasured disturbances. Since e(t) = SP — PV, this is equivalent to saying that a controller seeks to maintain controller error, e(t), equal to zero.

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07
Apr 2015
36

Design and Tuning Recipe Must Consider Nonlinear Process Behavior

Process Control Preliminaries controlguru

Processes with streams comprised of gases, liquids, powders, slurries and melts tend to exhibit variations in behavior as operating level changes. This, in fact, is the very nature of a nonlinear process. For this reason, our recipe for controller design and tuning begins by specifying our design level of operation.

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