Feedforward Compensation With Overrides

A convenient method for providing feedforward compensation that does not interfere with either normal reset or antireset windup involves the use of an "impulse" relay and a summer as shown in Figure 9.8. In pneumatics these functions are sometimes combined into a single device. The impulse function

Temperature Cascade Controle

FIGURE 9.6

Column base temperature control with AP override

FIGURE 9.6

Column base temperature control with AP override

PRIMARY (MASTER) CONTROLLER

PRIMARY TRANSMITTER

FIGURE 9.7

Antireset windup for cascade loops

Column With Total Reflux

TO CONTROL VALVE

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    How to control total reflux column?
    8 years ago

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