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What is cascade control in process instrumentation?
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Answer Posted / abhishek vyas srf limited
Best example of cascade control is level control of a
tank. first taking care of it's actual level( getting
signal from level transmitter) then controlling it's flow.
so only controlling element is flow and level singnal will
work as a setpoint for flow controlling.
There are two controller used one for level whose
controller o/p will work as a set point for flow controller
then final control signal from flow controller will actuate
the control valve. Thus actual level will achived.
| Is This Answer Correct ? | 25 Yes | 3 No |
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Q1: Consider part of a control loop, which excludes the transmitter, consisting of a process, a controller and a control valve which may be represented by two dead times of 0.5 min each and three exponential lags of 0.8 min., 1.0 min. and 1.5 min. respectively. We wish to express this system as an overall first order plus dead time (FOPLD) model ie gain, time constant and process dead time. (We will see later that this is often done, to simplify controller tuning). For this exercise, gain is considered to be 1.0. (A) If the transmitter is a flow transmitter whose behaviour can be described by a dead time of 0.2 min. and an exponential lag of 0.5 min. in terms of the overall dead time and overall first order lag how can the system behaviour be approximated ? Overall dead time = Overall time constant = (B) If the transmitter is a temperature transmitter with a temperature sensor in a protecting well whose behaviour can be described by a dead time of 0.7 min. and an exponential lag of 15 min. how can the overall system behaviour be approximated now? Overall dead time = Overall time constant =
