Tank

[Medamine0101]

Hello,

i'm realising simple project controling tank level with PID controller i did simulation and get stable response but i want to add cascade loop to make system more stable and fast i don't know how to combine 2 PID controllers.

Also i didn't use setpoint to show that output take near to setpoint cause i don't know how that's works in Labview.

i opened NI exemple in Labview cascade and feedfoward tank level i tried to remove fedforward to get cascade only but i can't..

Plz any suggestion or help it will be appreciable from you.

Thanks

[Medamine0101]

i get this with (P=6, I=10,D=26) without cascade but my project is based on to realise it with cascade loop..

http://cjoint.com/12mi/BEEpDAkExFP.htm

[David-A]

Hello Medamine0101,

If you open the example finder in LabVIEW and do a search for cascade you will find a few examples.  The Tank Level example that you mentioned is one of them but two others you may want to take a look at are DC Motor Cascade Speed Control.vi and Simulation - Cascade and Selector.vi.  Both of these demonstrate PID cascade in LabVIEW without using feedforward architecture.

David A

[Medamine0101]

Hi DAvid

Thank you for response i think i finished my project it's simple one, i didn't use simulation tank it's little complicated, i saw all this examples includin cascade control that you said..

if you want to verify my loops and block diagramme i'll post it here and thank you again!!

Mohammed Amine Jazouli

[Medamine0101]

here!!