Hello,
I have a Level -Flow Cascade loop control liquid in a tank similar to this example here http://blog.opticontrols.com/wp-content/uploads/2010/03/Cascade-Control1.png
The level is controlling good at setpoint with minuum process variable swing, my problem is the flow valve swings a lot to control the level. The flow valve swings between 10-70 % valve output.
This big swing causes process pressure swings upstream of the valve. These pressure swings causes other disturbance upstream.
Is there any way I can fine tune the level flow cascade loop so the flow valve swing is not very big? I was thinking of re-tuning the entire loops again, starting with the flow loop.
Thank you kindly.
In reply to Jeffrey Mach:
In reply to DCS Newbie: