Tuning Control Loops for Fast Response

Application Note by Data Forth: The well known Ziegler Nichols tuning rules work well only on processes with very long time constants relative to their dead times, and on level control loops. Its performance is not good on flow, liquid pressure, and many other loops. The Cohen-Coon tuning rules work well on virtually all self-regulating processes. These rules were originally designed to give a very fast response, but this results in loops with a very oscillatory response. With a slight modification of the Cohen-Coon tuning rules, control loops can still respond quickly, but they are much less prone to oscillations. This Application Note describes how to tune control loops using this modified Cohen-Coon tuning method.

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