Connect relays to 7i76
02 Aug 2017 14:46 #96917
by timmert
Connect relays to 7i76 was created by timmert
Hello
I'm not sure how to connect a relay to my 7i76 card.
It's a relay that will switch at 24V.
I already connected a 24V powersupply to my vfield. And that's working because my home switches are also connected to the vfield.
Maybe a stupid question or I'm not sure how it works. But how can I operate the vfield to go on/off? So the relay gets triggered.
The relay will operate the coolingpump
I'm not sure how to connect a relay to my 7i76 card.
It's a relay that will switch at 24V.
I already connected a 24V powersupply to my vfield. And that's working because my home switches are also connected to the vfield.
Maybe a stupid question or I'm not sure how it works. But how can I operate the vfield to go on/off? So the relay gets triggered.
The relay will operate the coolingpump
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02 Aug 2017 15:37 - 02 Aug 2017 15:38 #96919
by PCW
Replied by PCW on topic Connect relays to 7i76
7I76OUT --> RELAY-COIL.1 --> RELAY-COIL.2 --> GND
If the relay draws more than about 60 mA you need a flyback diode across the relay coil:
RELAY-COIL.1 --> DIODE-CATHODE = band (7I76 side)
RELAY-COIL.2 --> DIODE-ANODE (Ground side)
If the relay draws more than about 60 mA you need a flyback diode across the relay coil:
RELAY-COIL.1 --> DIODE-CATHODE = band (7I76 side)
RELAY-COIL.2 --> DIODE-ANODE (Ground side)
Last edit: 02 Aug 2017 15:38 by PCW.
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02 Aug 2017 16:33 #96923
by timmert
Replied by timmert on topic Connect relays to 7i76
I mean which pin on the 7i76 needs to be connected to the relay? That provides 24v?
Relay draws 70mA.
Relay draws 70mA.
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02 Aug 2017 16:45 - 02 Aug 2017 16:47 #96924
by PCW
Replied by PCW on topic Connect relays to 7i76
Outputs 0 through 7 are TB6 pins pin 17 through 24
Outputs 8 through 15 are TB5 pins 17 through 24
Outputs are sourcing, that is, they supply +24V to the relay when on
so the relay common must be at 24V GND
Outputs 8 through 15 are TB5 pins 17 through 24
Outputs are sourcing, that is, they supply +24V to the relay when on
so the relay common must be at 24V GND
Last edit: 02 Aug 2017 16:47 by PCW.
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02 Aug 2017 19:29 #96930
by rodw
Thanks PCW, you've given me a couple more jobs to do!
Replied by rodw on topic Connect relays to 7i76
If the relay draws more than about 60 mA you need a flyback diode across the relay coil:
RELAY-COIL.1 --> DIODE-CATHODE = band (7I76 side)
RELAY-COIL.2 --> DIODE-ANODE (Ground side)
Thanks PCW, you've given me a couple more jobs to do!
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02 Aug 2017 19:30 #96931
by timmert
Replied by timmert on topic Connect relays to 7i76
Ah ok!
So the voltage provided at vfield will also be used as voltage for the output?
What about the flyback diode? Can i buy these or do i need to make them? As complete electronic noob
So the voltage provided at vfield will also be used as voltage for the output?
What about the flyback diode? Can i buy these or do i need to make them? As complete electronic noob
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02 Aug 2017 19:56 #96936
by rodw
Replied by rodw on topic Connect relays to 7i76
IN4001,IN4004,IN4007, take your pick. The difference is in the voltage they can handle
See for example www.jaycar.com.au/active-components/discrete/diodes/c/211D
As you can see, they are hugely expensive![:) :)](/media/kunena/emoticons/smile.png)
Diodes only allow current to flow one way from the non banded end to the banded end. Voltage loss across a diode is 0.6 volts which is not significant with 24v signals.
See for example www.jaycar.com.au/active-components/discrete/diodes/c/211D
As you can see, they are hugely expensive
![:) :)](/media/kunena/emoticons/smile.png)
Diodes only allow current to flow one way from the non banded end to the banded end. Voltage loss across a diode is 0.6 volts which is not significant with 24v signals.
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03 Aug 2017 07:41 #96961
by timmert
Replied by timmert on topic Connect relays to 7i76
Thanks for the information.
So I just need to order a diode and solder one in between the 7i76 and relais + and one between relais - and ground?
So I just need to order a diode and solder one in between the 7i76 and relais + and one between relais - and ground?
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03 Aug 2017 08:15 #96962
by rodw
Replied by rodw on topic Connect relays to 7i76
Just bridge it across the relay terminals as PCW said is how I would do it.
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03 Aug 2017 08:28 #96963
by tecno
Replied by tecno on topic Connect relays to 7i76
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