Hello!
I am upgrading a furnace control system that will be using natural gas and combustion air ratio control. This will be done on a plc5/20e using rslogix5. I have done alot of programming on plc/5s, but have never actually gotten into this type of control scheme. I am hoping one of you experts can guide me generally in how to set this up. Of course Im not looking for a specific bunch of logic, just a general feel on how to proceed. I suppose the best way would be to use P.I.D. instructions, just not sure exactly how to set this up. My fuel range is 0-35000 scfh, and air is 0-350,000 scfh, both 4-20ma. The fuel will always get its setpoint from the air, (fuel follows air) controlled by temperature. Thank you, Jim
I am upgrading a furnace control system that will be using natural gas and combustion air ratio control. This will be done on a plc5/20e using rslogix5. I have done alot of programming on plc/5s, but have never actually gotten into this type of control scheme. I am hoping one of you experts can guide me generally in how to set this up. Of course Im not looking for a specific bunch of logic, just a general feel on how to proceed. I suppose the best way would be to use P.I.D. instructions, just not sure exactly how to set this up. My fuel range is 0-35000 scfh, and air is 0-350,000 scfh, both 4-20ma. The fuel will always get its setpoint from the air, (fuel follows air) controlled by temperature. Thank you, Jim