Greetings Everyone,
I am currently writing a program that controls a chemical reactioin chamber. At a certain point I need automatically control the temperature of the fluid inside the tank. The system is comprised of a hot oil skid and a chiller skid. I send this skid a setpoint and it either diverts the hot oil to the chiller or heater as needed to match my setpoint. There is an RTD in the tank that shows the actual fluid of the temperature. I tried using a PID loop to send the output to the hot oil system based on the RTD signal from the vessel but this resulted in huge over and undershoots. The oil runs around the outer jacket of the tank. I think the problem is that I am using a pid loop to control another pid loop that is built into the hot oil system. Does anyone have any ideas of how I could get better automatic control of this system? I am using a panelview 7 plus 10" and a control logix 5571 controller. Thanks in advance.
Russell
I am currently writing a program that controls a chemical reactioin chamber. At a certain point I need automatically control the temperature of the fluid inside the tank. The system is comprised of a hot oil skid and a chiller skid. I send this skid a setpoint and it either diverts the hot oil to the chiller or heater as needed to match my setpoint. There is an RTD in the tank that shows the actual fluid of the temperature. I tried using a PID loop to send the output to the hot oil system based on the RTD signal from the vessel but this resulted in huge over and undershoots. The oil runs around the outer jacket of the tank. I think the problem is that I am using a pid loop to control another pid loop that is built into the hot oil system. Does anyone have any ideas of how I could get better automatic control of this system? I am using a panelview 7 plus 10" and a control logix 5571 controller. Thanks in advance.
Russell