Though a variety of methods have been discovered for automatically tuning PID parameters, there are thought to be many cases in which adjustments can be made manually based on experience. The following is a procedure for manual tuning of the PID parameters that form the foundation of PID control. The method introduced here is the most well-known, the Ziegler-Nichols Critical Gain method.
Procedure
Notes
The examples given above are relatively common uses for manual PID parameter tuning, but this tuning method may not be optimal for all processes. In particular, when applying to PH control, reaction canister control, and other processes with a high degree of non-linearity, extra care must be taken since the control output can fluctuate greatly when changing the PID parameter, and the controlled objects (temperature, current, pressure, etc.) may change dramatically.
This Method is given by Yokogawa & so mainly applied to Centum Vp DCS.
Also Read: PID Controller Selection Guide
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