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PID Chap. 5 - Controller Features

Other Controller Features


Gain on process rather than error

In applications with high gain, a step change can result in a sudden, large movement in the valve.

• Not as severe as the derivative effect, but still can upset the process

• Solution: let gain act only on process rather than error.

Derivative on process rather than error

A step change in the setpoint results in a step change in the error.

• The derivative term acts on the rate of change of the error.

• The rate of change of a step change is very large.

• An operator step change of the setpoint would cause a very large change in the output, upsetting the process.

• Solution: let derivative act only on process rather than error.

back to index

go to chapter 4: Additional PID Concepts

go to chapter 6: PID tuning


ControlSim  The PID controller and process simulator based on MS Excel spread sheets.    $45.00 Click here to get more details, buy, and download

Buy and download my eBook: The PID Control Algorithm: How It Works, How To Tune It, and How to Use It. 2nd ed. 62pp
Adobe .pdf file                      only $15

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