What are the advantages and disadvantages of Cascade control?

Advantages of Cascade control Loop-

-Isolating the slow outer loop from valve problems and some disturbances. Fast inner loop take care of these.

Disadvantages of cascade control loop.

-Additional measurement required. -Additional control required.So controller tuning of secondary controller is required.

When to use cascade control loop?

-Inner loop should be faster (3 times) than outer loop.

What is the tuning sequence of cascade control?

First tune the inner loop Enable cascade control Tune the outer loop

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