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Old December 23rd, 2014, 08:21 AM
rezabejd's Avatar
rezabejd rezabejd is offline
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Join Date: Dec 2003
Posts: 4,294,967,295
This is a challenge, but more of a valve sizing and controller tuning challenge that a fieldbus one.

Is there any surge capacity e.g. a suction drum? A bigger suction drum would reduce the demands on the control system for quick response.

The valve positioner has tuning parameters that you can adjust for fast response (although it could become unstable) and once you've optimized that, you can look at your controller tuning and try to find some settings that minimize overshoot while still getting to setpoint.

Is it possible to add a delay to the shutdown?

You should also configure the fastest possible macrocycle, assuming this is a fieldbus application.
John Rezabek, Process Control Specialist
Ashland, Inc. Lima Site, 1220 S Metcalf St, Lima, OH. 45804 USA
Chairman, FF EUAC


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