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The Cohen-Coon Method - The Cohen-Coon Tuning Rules Work Well On Processes Where The Dead Time Is Less Than Two Times The Length of The Time Constant

The Cohen-Coon tuning method uses process gain, dead time, and time constant determined from a step test to tune controllers for self-regulating processes where dead time is less than twice the time constant. It provides faster response than Ziegler-Nichols and works well for most industrial processes involving temperature, flow and pressure control that have first-order lag dynamics.

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Vishnuboy Vishnu
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667 views1 page

The Cohen-Coon Method - The Cohen-Coon Tuning Rules Work Well On Processes Where The Dead Time Is Less Than Two Times The Length of The Time Constant

The Cohen-Coon tuning method uses process gain, dead time, and time constant determined from a step test to tune controllers for self-regulating processes where dead time is less than twice the time constant. It provides faster response than Ziegler-Nichols and works well for most industrial processes involving temperature, flow and pressure control that have first-order lag dynamics.

Uploaded by

Vishnuboy Vishnu
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Cohen-Coon Method:

The Cohen-Coon tuning rules use three process characteristics: process gain,


dead time, and time constant. These are determined by doing a step test and
analysing the results.The Cohen-Coon method work well on virtually all self-
regulating processes and were designed to give a very fast response compared to
Ziegler-Nichols method. The Cohen-Coon tuning rules work well on processes where
the dead time is less than two times the length of the time constant.
Advantages: Good process model and simple model to use.
Disadvantages: Need to use equation to calculate the parameters, required First
Order Plus Dead Time (FOPDT) model and suitable for first order process
Application: 1) Cohen-Coon tuning rules are effective on virtually all control loops
with self-regulating processes. Most control loops such as flow, temperature and
pressure contain self-regulating process.
2) Cohen-Coon method is designed for use on a non-interactive
controller algorithm.
3) The modified Cohen-Coon method provides fast response and is an
excellent alternative to Ziegler-Nichols for self-regulating processes.

Cohen-Coon method equation

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