# Home > Automation > Control Mode

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**Topic under **Control Mode

**Source:** watlow.com

**File size:** **23.05 KB**

**File type:** **pdf**

**Last download on:**
Tue Apr 10, 2018 05:30:39 AM

__Short Desciption__:

Proportional, Integral and Derivative (PID) Control The three-mode PID control is used primarily when overshoot of the PV cannot be tolerated as in the Quarter Wave Decay response of ...

__Summary__:

This manual method that has been used on thousands of processes and
hundreds of different controllers with a very good success rate. This procedure
has been developed from many years of experience and has proven to be useful for processes where autotuning and adaptive tuning may have failed or is not available.

To avoid upsetting the process when changing PID values, place the control
in manual. While in manual, the PID values may be changed without upsetting the output. After changing PID values, place the loop back into auto. If a small upset of the output is not important, PID constants may be tuned while in auto.

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"Tuning PID Loops"

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