I need to tune a level control loop output from oscillating to big. The level is used to control level in a column and simple feedback loop, normally in AUTO.
The problem is the pv tracks the sp ok, but the output (valve) swings too much which things downstream. I have been tasked with reducing how much the valve opening and close just to control sp.
I do not have full license Insight, but I do have Insight On Demand Tuning. However, when I try a test (with step response of about 2 or 3), I get error such as "process response from step change occurred in the wrong direction. Check the control action (revers or direct) for correct setting, or adjust tuning settings). I believe this mean, my output swings too much to perform the tuning.
http://i.imgur.com/LUrwbaO.png (L101LC, Set-point vs Process Variable)
http://i.imgur.com/XV9MTwB.png (L101LC, Set-point vs Process Variable vs output)
Is there away to tune the loop so the valve output does not oscillate so much? Is Insight On Demand Tuning giving error because my loop is oscillating too much?
In reply to Andre Dicaire:
If it is a surge tank application, I have a couple of posts you may want to see:
Hopefully these might help.
In reply to Jim Cahill:
In reply to Mark Coughran:
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