Figure 31 PID Controller Response Curves

Figure 30 PID Control Action Responses

Proportional Plus Reset Plus Rate Control Summary

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Process Controls PID CONTROL SYSTEMS You must remember that these response curves are drawn assuming no corrective action is taken by the control system. In actuality, as soon as the output of the controller begins to reposition the final control element, the magnitude of the error should begin to decrease. Eventually, the controller will bring the error to zero and the controlled variable back to the setpoint. Figure 31 demonstrates the combined controller response to a demand disturbance. The proportional action of the controller stabilizes the process. The reset action combined with the proportional action causes the measured variable to return to the setpoint. The rate action combined with the proportional action reduces the initial overshoot and cyclic period. Figure 31 PID Controller Response Curves Rev. 0 Page 45 IC-07

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