= controller gain or sensitivity, = the error signal.
Hence, the greater the error (environmental change) the larger is the initial corrective action which will be applied. The response to proportional control is shown in Fig. 8.17, from which it may be observed that there is a time of oscillation which is reduced fairly quickly. It should also be noted that the controlled variable attains a new equilibrium value. The difference between the original and the new equilibrium value is termed the offset.
The term Kc (controller gain) is the multiplying factor (which may be dimensioned) which relates a change in input to the change in output.
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