paddy-dee
-
Posts
2 -
Joined
-
Last visited
Content Type
Profiles
Forums
Gallery
Events
Blogs
Downloads
Articles
Media Demo
Posts posted by paddy-dee
-
-
Hello forum
Have there a question about the PID controller. I use two PID controllers (auto tune) in master slave mode (cascade) to heat and cool. I switch with the BIT "action; 0 = Reverse (Heating), 1 = Direct (Cooling)" to heat or cool.
My problem is the controller output:
The controller is cool, the setpoint is not quite reached yet and the contoller output has eg a value of 20%. Now the actual value falls below the setpoint. So I switch the PID controller to "heat up". Now the controller output still has 20% at the output. When switching from cooling to heating, the controller output is not reset, also not recalculated for heating.
Is there a way to reset the controller? So that he recalculates the controller output?
I'm doing an ugly detour right now! I change the proportional band to 0.1% for one second and then back to the effective value. The controller output is calculated "new" again.
Works, but I do not like it that way.
PID CV-reset after status change heat cool
in Vision & Samba PLC + HMI Controllers & VisiLogic Software
Posted
Dear Gabriel
Thank you so much for this quick and perfect reply !!!
Kind regards
Patrick