saultgeorge
Lifetime Supporting Member
Hey, folks!! I need professional input on a sequencing I'm creating in RS5K V. 20.04. I have to have this done by the 5th, next week!!
I have a cooling and heating routine in an Air handler I've written logic for. The unit is used for extreme cooling and heating in a test cell for prototype cars.
Their system uses a liquid called Syltherm, which will get to minus 40 and up to 140 Deg. F.
Their spec calls for sequencing from 140 to 30 Deg either raising or lowering not more than 20 Deg/hour. From say, 29 to -40 no more than 10 Deg/hour. I'm assuming this is so the mechanical systems (plumbing, valves, etc.) do not experience extreme thermal shock. Makes sense. So far I have 2 different gain rungs for each PID (Cool and Heat valves) that are conditioned by limit instructions and I have a timer that I can use with logic to calculate how much time it needs to take based on the difference between the temp and the new setpoint. Do y'all think I'm on the right track? Maybe someone can tell me how to do this in one rung, which is usually what happens. Thanks and have a great weekend. I can post snips of some of the logic if one of you folks needs it.
I have a cooling and heating routine in an Air handler I've written logic for. The unit is used for extreme cooling and heating in a test cell for prototype cars.
Their system uses a liquid called Syltherm, which will get to minus 40 and up to 140 Deg. F.
Their spec calls for sequencing from 140 to 30 Deg either raising or lowering not more than 20 Deg/hour. From say, 29 to -40 no more than 10 Deg/hour. I'm assuming this is so the mechanical systems (plumbing, valves, etc.) do not experience extreme thermal shock. Makes sense. So far I have 2 different gain rungs for each PID (Cool and Heat valves) that are conditioned by limit instructions and I have a timer that I can use with logic to calculate how much time it needs to take based on the difference between the temp and the new setpoint. Do y'all think I'm on the right track? Maybe someone can tell me how to do this in one rung, which is usually what happens. Thanks and have a great weekend. I can post snips of some of the logic if one of you folks needs it.