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Advanced Regulatory Control by David W. Spitzer

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Cascade Control

A cascade control loop consists of two feedback control loops, where each control loop has its own process variable measurement, but only one control loop manipulates the final control element. Significantly improved control can often be achieved using cascade control, however two process measurements and two controllers are required for implementation.

In a regulatory control loop, the regulatory controller manipulates the final control element directly (typically varying flow).

In a corresponding cascade control loop, the output of the master controller uses the corresponding regulatory controller process variable as its process variable to set the set point of a slave controller. Based upon this setpoint, the slave controller ...

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