Please help me set up my RIMS PID
Posted: Tue Jan 19, 2010 6:15 am
I set up my prototype brewery last night and ran into some problem with the PID settings. This is what I am trying to do.
Temp0 is in the RIMS
Temp1 is in the Mashtun
State0: heat to 165 when Temp1 >= 165 move to state1
State1: PID Temp0 at 165 user input to move to state2
State2: PID Temp0 at 154 for 60 minutes
State3: raise temperature to 168
I have a 10 gal Blichmann Mashtun with 3 gallons of water in it, no insulation, no lid. I am using thick walled opaque silicon tubing. My RIMS heater is a 1500 ULD element. I am cycling the water with a march pump at a very slow flow rate. The protype was in my living room, ambient was 68F.
When in state 2 I can't get the mashtun temperature correct. I raised the setpoint temperature to 160F but I am afraid to go much higher. At that set point the temperature in the MT fell to 147. Following this guideline (http://www.omega.com/temperature/Z/pdf/z115-117.pdf) I divided the proportional gain by 2 making it 10. This made the problem even worse and my MT temp fell to 140 before I stopped trying.
Am I PID controlling the wrong temperature? Are my setting wrong? Thanks for any insight or help you can give me.
Here is a picture of my prototype.
Temp0 is in the RIMS
Temp1 is in the Mashtun
State0: heat to 165 when Temp1 >= 165 move to state1
State1: PID Temp0 at 165 user input to move to state2
State2: PID Temp0 at 154 for 60 minutes
State3: raise temperature to 168
I have a 10 gal Blichmann Mashtun with 3 gallons of water in it, no insulation, no lid. I am using thick walled opaque silicon tubing. My RIMS heater is a 1500 ULD element. I am cycling the water with a march pump at a very slow flow rate. The protype was in my living room, ambient was 68F.
When in state 2 I can't get the mashtun temperature correct. I raised the setpoint temperature to 160F but I am afraid to go much higher. At that set point the temperature in the MT fell to 147. Following this guideline (http://www.omega.com/temperature/Z/pdf/z115-117.pdf) I divided the proportional gain by 2 making it 10. This made the problem even worse and my MT temp fell to 140 before I stopped trying.
Am I PID controlling the wrong temperature? Are my setting wrong? Thanks for any insight or help you can give me.
Here is a picture of my prototype.