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(Cascade Control)In single-loop control, the controller’s set point is set by an operator, and its output drives a final control element.
Cascade control has three disadvantages. One, it requires an additional measurement (usually flow rate) to work. Two, there is an additional controller that has to be tuned. And three, the control strategy is more complex – for engineers and operators alike. These disadvantages have to be weighed up against the benefits of the expected improvement in control to decide if cascade control should be implemented.
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Cascade Control is the control obtained with two or more controllers, there is one master and one slave controller as minimum. The advantage of this control is better regulation and better sensitivity in the control of controlled variable.
