travispedley
Member
OK, 1st off, I have almost 0 pid experience.
I have a tank that holds a product. I need to regulate the temperature of the product using steam / chiller. each has a 4-20mA flow control valve. i set up a cascading loop like the one shown in the attached manual. it isn't working. like, not even close. The pid won't respond until its well passed the setpoint in each direction (heating and cool). I have 2 sets of these cascading loops, one for the heating circuit and one for the cool. I have to be able to hold 0.25deg C for 30 minutes. What do i need to set as far as parameters in the loops?? nothing i do in the gains seems to make it stop overshooting.
there is a 0.25 degree deadband between the two actions.
i need some serious guidance on how to setup these loops, thanks for any help.
I have a tank that holds a product. I need to regulate the temperature of the product using steam / chiller. each has a 4-20mA flow control valve. i set up a cascading loop like the one shown in the attached manual. it isn't working. like, not even close. The pid won't respond until its well passed the setpoint in each direction (heating and cool). I have 2 sets of these cascading loops, one for the heating circuit and one for the cool. I have to be able to hold 0.25deg C for 30 minutes. What do i need to set as far as parameters in the loops?? nothing i do in the gains seems to make it stop overshooting.
there is a 0.25 degree deadband between the two actions.
i need some serious guidance on how to setup these loops, thanks for any help.