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Temp control with impulse switch relays

5/2/2023 1:17 PM	Rate (0)
PatrickDG Joined: 5/2/2023 Last visit: 10/24/2024 Posts: 8 Rating: (0)	Hi, I'm trying to build a temp control setup by using Logo and external relays that are PULSE based. PULSE: IMPULSE relay on PULSE: IMPULSE relay off I get a 0-10 V signal in, that is converted to a temperature value ( 0- 32 degrees) . What I want to obtain is that once temp goes above 25: it send a pulse out to the relay ( that connects a 2500 watt heater ) ; once the temp goes below 24.8, it sends a pulse to the relay ( that then disconnects the 2500 watt heater). I'm looking for the logic to send out a pulse based on the temperature instead of keeping it on or off . Thanks already for helping me
	Last edited by: PatrickDG at: 05/02/2023 14:41:26
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5/2/2023 3:30 PM	Rate (0)
ixo65 Grandmaster-Expert Joined: 12/18/2014 Last visit: 11/12/2024 Posts: 34192 Rating: (4260)	If you parameterize your hysteresis so tightly, then your pulse relay will always switch on and off. And what I don't understand: Above 25 °C do you want to switch the heating on, below 24.8 °C switch it off? Are you sure?
	Last edited by: ixo65 at: 05/02/2023 16:04:57
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5/2/2023 4:05 PM	Rate (0)
ixo65 Grandmaster-Expert Joined: 12/18/2014 Last visit: 11/12/2024 Posts: 34192 Rating: (4260)	Here is a possible solution.

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5/2/2023 11:12 PM	Rate (0)
PatrickDG Joined: 5/2/2023 Last visit: 10/24/2024 Posts: 8 Rating: (0)	Oops, you are correct, it's the other way. 24.8 ON, 25 OFF

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5/3/2023 1:47 AM	Rate (0)
ixo65 Grandmaster-Expert Joined: 12/18/2014 Last visit: 11/12/2024 Posts: 34192 Rating: (4260)	Then you have to swap the values for ON and OFF in the analog threshold switch (based on my screenshot).

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