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Heater and fan control

Created by: AutoGen_7313799 at: 3/16/2024 4:50 PM (7 Replies)

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3/16/2024 4:50 PM	Rate (0)
AutoGen_7313799 Joined: 9/27/2023 Last visit: 11/6/2024 Posts: 4 Rating: (0)	Hello all! I have a little project of temperature control. Here is the assignment: The system maintains the room temperature. The room temperature is measured with a pt100 sensor. The room temperature can be controlled with a heater and a fan. The heating must be switched on when the room temperature falls below the temperature value [Lower limit]. The heating must be switched off when the room temperature value [Upper limit]. Room ventilation must be switched on if the room temperature exceeds the temperature value [Upper limit] by 2 °C. Ventilation must be switched off when the room temperature falls below the temperature value [Upper limit]. All temperature setting values are made using the LOGO PLC function keys. For control LOGO PLC's own user interface is used as the user interface I have a problem with then fan control since it must turn on when the upper temperature limit is exceeded. Is it possible to set temperature limit somehow that the upper limit threshold trigger also controlls the cooler? Here is how I made is so far: Attachment thumbnail_image (1).png (228 Downloads)
	Last edited by: Jen_Moderator at: 03/18/2024 12:28:12 Text formatting optimized.
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3/16/2024 5:08 PM	Rate (0)
ixo65 Grandmaster-Expert Joined: 12/18/2014 Last visit: 11/6/2024 Posts: 34150 Rating: (4254)	I don't understand your question. You use a third threshold switch to turn the fan on and off. What do you think is wrong?

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3/16/2024 5:16 PM	Rate (0)
AutoGen_7313799 Joined: 9/27/2023 Last visit: 11/6/2024 Posts: 4 Rating: (0)	Thanks for your reply. The assignment says that the fan should always go on +2 celsius from upper temperature limit. The upper temperature limit should be controlled via user interface. Upper temperature limit is the same as when heater goes off. Does that clarify? I'm not sure if it is possible to do it that way but that's how I understood the assignment. I translated is from my native language so it may be a bit unclear as English.

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3/16/2024 5:30 PM	Rate (0)
ixo65 Grandmaster-Expert Joined: 12/18/2014 Last visit: 11/6/2024 Posts: 34150 Rating: (4254)	If I understand you correctly, you want to keep the upper temperature limit variable and be able to set it via the display. But only in one place. Am I getting you right?

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3/16/2024 5:32 PM	Rate (0)
AutoGen_7313799 Joined: 9/27/2023 Last visit: 11/6/2024 Posts: 4 Rating: (0)	Yes that´s right! Also the fan should have +2 celsius higher upper limit. Is that possible?

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3/16/2024 5:34 PM	Rate (0)
ixo65 Grandmaster-Expert Joined: 12/18/2014 Last visit: 11/6/2024 Posts: 34150 Rating: (4254)	Yes. I make you an example.

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3/16/2024 5:37 PM	Rate (0)
AutoGen_7313799 Joined: 9/27/2023 Last visit: 11/6/2024 Posts: 4 Rating: (0)	Thank you so much!

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3/16/2024 5:48 PM	Rate (2)
ixo65 Grandmaster-Expert Joined: 12/18/2014 Last visit: 11/6/2024 Posts: 34150 Rating: (4254)	See attachment. Attachment Heater+Fan_control_0BA8.Standard.zip (324 Downloads)

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