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Analog threshold trigger - problem with temperature regulation

Created by: Kukis at: 3/14/2023 6:21 AM (5 Replies)

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3/14/2023 6:21 AM	Rate (0)
Kukis Joined: 5/27/2022 Last visit: 10/25/2023 Posts: 16 Rating: (0)	Hello, I found a problem with the analog threshold trigger, when regulating the temperature. When I set the shutdown temperature to, for example, 28°C, when the temperature slowly approaches the limit temperature of 28°C, the relay does not turn off immediately, but starts to click as if the temperature fluctuates. It only does this when the tpleota is slowly rising and falling. If the temperature goes quickly, it's fine. I use a converter from Aliexpress RTD 0-10V, -50°C - 100°C and according to these parameters I have the analog input correctly set, the sensor - measurement range from -50°C to 100°C and also the analog amplifier also as 0-10V from -50°C to 100°C. When I try it through the AM2 RTD converter, it doesn't do it, then it works fine. Can it be solved? without having to change 4 converters. Thanks for every reply.

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3/14/2023 6:26 AM	Rate (0)
ixo65 Grandmaster-Expert Joined: 12/18/2014 Last visit: 12/1/2023 Posts: 31530 Rating: (3916)	Did you take a hysteresis between the ON and OFF values of the threshold trigger? Show us the settings ...

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3/14/2023 2:54 PM	Rate (0)
Kukis Joined: 5/27/2022 Last visit: 10/25/2023 Posts: 16 Rating: (0)	ixo65 Did you take a hysteresis between the ON and OFF values of the threshold trigger? Show us the settings ... Hello, thank you for the quick reply, I am sending the program and the picture in the attachment. I have it set so that the electric spiral heats the water and when the water reaches the set temperature so that the spiral turns off. Attachment Diagram1.zip (222 Downloads)

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3/14/2023 2:55 PM	Rate (0)
Kukis Joined: 5/27/2022 Last visit: 10/25/2023 Posts: 16 Rating: (0)	Attachment diagram picture.png (245 Downloads)

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3/14/2023 3:19 PM	Rate (0)
ixo65 Grandmaster-Expert Joined: 12/18/2014 Last visit: 12/1/2023 Posts: 31530 Rating: (3916)	If I understand you right? You want that Q1 is on if the temperature is lower then 25 °C and off if the temperature is higher then 25 °C. Correct? Then would I suggest the follow. Set by the analog amplifer (B002): Gain: 1,5 Offset: -500 Decimal places: 1 Then have you in the display a temperature range from -50,0 - 100,0 °C. This is better for controlling the temperature. Set the threshold trigger (B001): On: 250 Off: 240 Decimal places: 1 Between the threshold trigger and the output Q1 then a NOT block. So you have a hysteresis from 1,0 °C. Is the temperature lower then 24,0 °C switch Q1 on. Increases the temperature over 25,0 °C, Q1 switches off. Drops the temperature then under 24,0 °C, Q1 switch on again.

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This contribution was helpful to 1 thankful Users Kukis

3/14/2023 3:57 PM	Rate (0)
Kukis Joined: 5/27/2022 Last visit: 10/25/2023 Posts: 16 Rating: (0)	ixo65 If I understand you right? You want that Q1 is on if the temperature is lower then 25 °C and off if the temperature is higher then 25 °C. Correct? Then would I suggest the follow. Set by the analog amplifer (B002): Gain: 1,5 Offset: -500 Decimal places: 1 Then have you in the display a temperature range from -50,0 - 100,0 °C. This is better for controlling the temperature. Set the threshold trigger (B001): On: 250 Off: 240 Decimal places: 1 Between the threshold trigger and the output Q1 then a NOT block. So you have a hysteresis from 1,0 °C. Is the temperature lower then 24,0 °C switch Q1 on. Increases the temperature over 25,0 °C, Q1 switches off. Drops the temperature then under 24,0 °C, Q1 switch on again. You understood it well. Now it works exactly as I needed it to. Thank you for quickly solving the problem.

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This contribution was helpful to 1 thankful Users ixo65

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