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PID FOR HEATING OK WHAT ABOUT PID FOR COOLING?

Created by: ErolAyas at: 9/13/2013 1:30 PM (4 Replies)

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9/13/2013 1:30 PM	Rate (0)
ErolAyas Posts: 12 Rating: (1)	Hello; I am using F41 PID function im my program. There is a heating valve when i set the temperature for example 70 degre celcius. if the prosess value lower then set value valve is opening, if the prosess value over then set value valve is closing, it is ok. There is an other valve for cooling. if the prosess value over then set value valvemust beopening, if the prosess value lower then set value valvemust beclosing. I could not configure PID for this application. Please help me for that. I am waitting online for your repply. Best regards. Erol
ErolAyas Posts: 12 Rating: (1)
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9/13/2013 1:35 PM	Rate (1)
dchartier Grandmaster Joined: 9/27/2006 Last visit: 3/20/2023 Posts: 11992 Rating: (2573)	Hello Erol; I would consider 2 PID blocks, one acting on the heating valve, one on the cooling valve, and I would make sure logic conditions and setpoints would activate only one block at a time (the control must be exclusive), depending on environmental conditions. What did you have in mind? Hope this helps, Daniel Chartier

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9/13/2013 1:43 PM	Rate (0)
ErolAyas Posts: 12 Rating: (1)	Dear Dchartier; I am already usingdifferentPID blocks for each valve. In myapplication cooling valve PIDworking like heating valve PID block. I mean if prosess value lower then set value valve is opening, if process valueover then set value valve is closing but if prosess value over then set value valvemust beopening, if prosess valuelower then set value valve must be closing because i want to cooling the process. Thanks
ErolAyas Posts: 12 Rating: (1)
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9/13/2013 2:06 PM	Rate (1)
Wizard Diamond Member Joined: 4/24/2006 Last visit: 3/16/2023 Posts: 8586 Rating: (1125)	Hello ErolAyas, Are you using a Positive gain in "cooling" Pid? Try to use negative gain Best regards, Wizard

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This contribution was helpful to 1 thankful Users hdhosseini

9/13/2013 2:23 PM	Rate (0)
ErolAyas Posts: 12 Rating: (1)	Thank you Wizard; When i apply nagative gain it is ok. Now i must configure PID parameters according to process. Thanks.
ErolAyas Posts: 12 Rating: (1)
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