Why are both the reactive and non-reactive types chosen for the LC controllers and FC controllers used in the three-impulse drum control system of my plant?
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For flow control valves, air-operated valves are chosen. Many online resources explain that if LC is used, a reverse-acting type should be selected, while for FC, a direct-acting type should be chosen – please provide a solution
How about three Impulse Control? Is it useful? Is the drum liquid level under stable control?
What the book says is correct, and their configuration is also right.
This post was last edited by budaoweng123 on 2017-5-26 08:16. FC represents inversion, as this valve needs to invert its output when AO is active. Otherwise, a value of 100 from your FC output corresponds to the on-site valve being fully closed.
The locator can also be changed. Actually, it doesn’t matter whether it’s positive or negative; as long as the switch is in the correct state, that’s fine.