The Basics of PID Control

By Anonymous -
Having been introduced to the basic principles of feedback control modes, we now discuss how these modes can be applied to real life control problems.
It should now be clear that using proportional, integral or derivative mode alone cannot achieve the desired control objective. What works is a combination of these modes. 
By using all the three control modes together, we can:
(1) Hold the process near set point without major fluctuations with proportional       control.
(2) Eliminate offset with integral control.
(3) Achieve rapid response to major disturbances with derivative control.

PID Relationships:
(1) P-Control is the principle method of control and should do most of the work
(2) I-Control is added carefully just to remove the offset left behind by P-control.
(3) D-Control is there for stability only. It should be set up so that its stabilizing effect is larger than the destabilizing effect of I-control. D-Control is never used in a system that has a lot of noise.
Below is shown a feedback control system having a PID Controller
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