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Integral (Reset) Control Theory

S Bharadwaj Reddy
Imagine a liquid-level control system for a vessel, where the position of a level-sensing float sets the position of a potentiometer, which then sets the speed of a motor-actuated control

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

Derivative Controller Principle

S Bharadwaj Reddy
RATE OR DERIVATIVE ACTION Consider a control system subjected to a disturbance, which causes the error to increase in a ramped manner. Proportional control would respond to this ramped error with a

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