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Answer Posted / www.islamqa.com
# The cascade control is a control strategy used to have
more stabilization in the control loop.
# Actually we don't need to wait till we have an error in
Pv to start the corrective action, the secondary controller
start responding for any small load disturbance, so we have
more predictable response and more stabilized loop.
# For the loop structure, we have the primary control loop
(master controller) give its o/p to the set point port of
the secondary control loop (slave controller) & the o/p of
secondary controller is connected with the final control
element.
# A good example for cascade is: any process with
controller and the final control element is a "valve with
positioner", here we have the secondary contoller is the
positioner itself which has a secondary closed loop with
the valve.
Regards,
Ahmed Sabry
Control and Instrumentation Engineer
GPC - General Petroleum Company
ahmedsabry.online@gmail.com
CELL.: 00 2 0121367310
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