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When to select P-I controller? Give any two application of P-I controller.

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Selection of P-I controller: 

The PI mode of controller is commonly selected for slow-to- moderate speed processes. 

Fast response of the system is not required. 

Large disturbances and noise are present during operation of the process. 

There is only one energy storage in process (capacitive or inductive). 

There are large transport delays in the system.

Applications of P-I controller: 

PI controller is used in the control system with frequent or large load changes. 

Because of the integration time, the process must have relatively slow changes in the load to prevent conditions indicated by the integral overshoot. 

Used in industry where speed of response is not an issue. 

As a adaptive controller for flow process. 

Real time pressure control process.

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