Process Controls PROPORTIONAL PLUS RATE CONTROL SYSTEMSFigure 29 Effect of Disturbance on Proportional Plus Rate Reverse ActingControllerApplicationsProportional plus rate control is normally used with large capacity or slow-responding processessuch as temperature control. The leading action of the controller output compensates for thelagging characteristics of large capacity, slow processes.Rate action is not usually employed with fast responding processes such as flow control or noisyprocesses because derivative action responds to any rate of change in the error signal, includingthe noise.Proportional plus rate controllers are useful with processes which are frequently started up andshut down because it is not susceptible to reset windup.Rev. 0 Page 41 IC-07
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