Cascade Loop VS Feedback loop explained with Animation | Hindi | Electrical & Automation 

cascade control involves the use of two controllers with the output of the first controller providing the set point for the second controller, the feedback loop for one controller nestling inside the other.
Cascade control is an implementation that can allow an application to be more responsive to disturbances and less susceptible to downtime through the use of multiple control loops which monitor multiple signals for one manipulated variable.