Process Controls RESET (INTEGRAL) CONTROL SYSTEMSFigure 19 Integral Output for a Fixed InputExampleofanIntegralFlowControlSystemWith integral control, the final control element’s position changes at a rate determined by theamplitude of the input error signal. Recall that:Error = Setpoint - Measured VariableIf a large difference exists between the setpoint and the measured variable, a large error results.This causes the final control element to change position rapidly. If, however, only a smalldifference exists, the small error signal causes the final control element to change position slowly.Figure 20 illustrates a process using an integral controller to maintain a constant flow rate. Alsoincluded is the equivalent block diagram of the controller.Rev. 0 Page 29 IC-07
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