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Proportional-only Control Theory

S Bharadwaj Reddy
Imagine a liquid-level control system for a vessel, where the position of a level-sensing float directly sets the stem position of a control valve. As the liquid level rises, the...

How to Select the Right Type of Controller

S Bharadwaj Reddy
Distinguishing Characteristics  P-only Accelerates the response of controlled process Produces offset except for integrating (1/s) processes PI Eliminates offset Usually higher maximum deviations than P-only Sluggish, long oscillating responses Increased...

Proportional Controller Principle

S Bharadwaj Reddy
If the outflow (Qo) increases then the level in the tank will fall. The pressure sensed by the level transmitter, which is representative of the level in the tank, will also fall...

Why Offset in Proportional Controller ?

S Bharadwaj Reddy
Proportional controller: With proportional band, the controller output changes in “proportion” to the error between process variable and set point. The amplitude of the change is adjustable from 1% to...

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