Interested to Buy Any Domain ? << Click Here >> for more details...
cascade controller is feed back or feed forward or both
- 4 Answers
- 10433 Views
- I also Faced
- E-Mail Answers
Answer Posted / rajkumar
its a feed back loop.
Cascade Control uses the output of the primary controller
to manipulate the setpoint of the secondary controller as if
it were the final control element.
Reasons for cascade control:
* Allow faster secondary controller to handle
disturbances in the secondary loop.
* Allow secondary controller to handle non-linear valve
and other final control element problems.
* Allow operator to directly control secondary loop
during certain modes of operation (such as startup).
Requirements for cascade control:
* Secondary loop process dynamics must be at least four
times as fast as primary loop process dynamics.
* Secondary loop must have influence over the primary loop.
* Secondary loop must be measured and controllable.
Reasons not to use cascade:
* Cost of measurement of secondary variable (assuming it
is not measured for other reasons).
* Additional complexity.
| Is This Answer Correct ? | 18 Yes | 2 No |
Post New Answer View All Answers
whatis range of marcury filled tempereture gague
how to calibrate corollaries (Mass flow meter)?
what is the difference between Cv and air consumption? why the customer needs Air consumption details?
How to Calibrate Vortex Flow transmitter in field
what is piezoelectric transducer?give an example in power plant n state its principle?
what is sliding spool valves?
Isometric drawings are generated during _________________ phase of a project
List three types Level Switches with their working principles
Can I calibrate the Electromagnetic Flow Meter on line and How.
Why even multiple power supplu r used in instrumentation system?
What are continuances of connecting earthing and shield of branch cables (instrument to Junction box), at the same earthing pot provided on JB? Is it ok, or may produce some problem?
What is feed factor and its Importance in cement industry? How we can solve feed factor?.
What should be the main consideration while starting the Rotating compressor when we dont know the cut in and the cut off pressure setting of the pressure switch
Can anybody tell me which type of question are asked in the interview for the FORMULATION(Pharma) as a instrumentation engineer, & question in building managment system.
POSSITIVE PULSE IS APPLIED TO AN INVERTER INPUT.THE TIME FROM THE LEADING EDGE OF THE INPUT TO THE LEADING EDGE OF THE OUTPUT IS 10 ns. THE TIME FROM THE TRAILING EDGE OF THE INPUT TO THE TRYLING EDGE OF THE OUTPUT IS 8 ns. WHAT ARE THE VALUES OF tPLH and tPHL?
