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controlling a variable speed pump with a temperature difference

7/29/2020 7:15 PM	Rate (0)
harewoods Regular Member Joined: 6/22/2020 Last visit: 9/21/2022 Posts: 10 Rating: (0)	Hi, I'm hoping to find a way to proportionally control a pump with an analog output depending on the temperature difference between two pt1000 sensors. The output signal needs to be between 0-5V. If the difference is 4°C the pump should switch on en start to ramp up till 100% (5V analog output) at 10°C difference. So if the difference is bigger, the pump goes faster. if it goes beyond 10°C difference it should stay at 5V. if the difference goes below 4°C it is switched off. At 7°C difference the pump should thus go at 50% (2.5V analog output). How can i make this work in Soft Comfort?

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7/29/2020 7:20 PM	Rate (0)
ixo65 Grandmaster-Expert Joined: 12/18/2014 Last visit: 11/2/2024 Posts: 34125 Rating: (4249)	Hello herewoods, at first welcome to the forum. Without more precise information about the hardware would be used, I can only give a general answer: Yes, it is possible.

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This contribution was helpful to 1 thankful Users harewoods

7/29/2020 11:12 PM	Rate (0)
harewoods Regular Member Joined: 6/22/2020 Last visit: 9/21/2022 Posts: 10 Rating: (0)	thank! I have a Siemens Logo! With an AM2 RTD for the sensors and an AM2 AQ to output an analog signal to control the pump. The question now however is mainly how to make the FBD in Soft Comfort that takes the difference of these two analog inputs and convert them to one analog output with the requirements above. I managed to get it working in the attached file. At least.. i get the desired output.. But is there a more elegant way to get the same effect? Attachment modulating pump.lsc.zip (204 Downloads)

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7/30/2020 5:40 AM	Rate (0)
ixo65 Grandmaster-Expert Joined: 12/18/2014 Last visit: 11/2/2024 Posts: 34125 Rating: (4249)	Without documentation of the program and without a functional description, it is very difficult to understand the function of the program. You haven't written anything about 2 valves, 2 temperatures, etc. before. But if the program works the way you want it to be, it's fine.

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7/30/2020 9:41 AM	Rate (0)
Scorp Platinum Member Joined: 2/22/2008 Last visit: 8/6/2024 Posts: 2698 Rating: (208)	See attachment for a program with less blocks. It seems to be the same, if i have understand your program correct. Regards, Scorp Attachment Modulating pump V2.zip (234 Downloads)

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