December 2002
Intermediate to advanced
800 pages
18h 7m
English
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8.11. Manipulated Variable Saturation
The reader should note that if the actual manipulated variable signal is used by the model, then manipulated variable saturation is not a problem because the system becomes open-loop and the model prediction is the same as the process output (if there are no disturbances and the model is perfect). In conventional PID controllers, special precautions must be taken to prevent reset or integral windup from occurring when manipulated variables hit constraints. This phenomenon is discussed more fully in Chapter 11.
The IMC block diagram for the case where the actual manipulated variable value that is implemented on the process is also used by the model is shown in Figure 8-20. Integral “wind-up” will not be a ...
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