Using a relay to open and close a gate

Thread Starter

mmclary

Joined Mar 31, 2016
3
I installed a gate opener (Aleko) which can be controlled by a non-powered push button. I also purchased a video intercom that has an unlock feature (NO COM NC). I would like to send the unlock signal to open the gate. The NO and NC send 12V signals and cannot be hooked up directly to gate opener via the O/S/C connect (same one used by the non-powered push button) because the 12V would fry the board.

I believe a 12V relay work allow me to use the NO or NC unlock feature to power a switch that will work similar to the non-powered push button.

What type of relay did I need to buy? Am I going down the right path?

Thank you
 

wayneh

Joined Sep 9, 2010
16,399
What type of relay did I need to buy? Am I going down the right path?
An automotive relay would be easy to find and would be fine for the 12V operation.

A few questions:
What's a "non-powered" push button? Is this like a door remote?
The relay you choose will require a current (usually given in milliamps, mA) to operate. Your intercom has a max current rating on its output. You want the intercom to be rated for more than the relay requires. Can you tell what these ratings are?
Can you describe the gate "O/S/C connect" in more detail? It's possible you don't need a relay at all, you may just need to condition the intercom output to match up to the gate input.
 

Thread Starter

mmclary

Joined Mar 31, 2016
3
Thank you for responding! Really thank you....

Answers below:

What's a "non-powered" push button? Is this like a door remote? (please see product via link...http://www.alekogates.com/ALEKO-LM147-Push-Button-for-any-GateOpener-p/lm147-ag.htm)

Screen Shot 2016-03-31 at 10.49.57 PM.png



The relay you choose will require a current (usually given in milliamps, mA) to operate. Your intercom has a max current rating on its output. You want the intercom to be rated for more than the relay requires. Can you tell what these ratings are? 12V 2A


Can you describe the gate "O/S/C connect" in more detail?

This is all I have for you..."Push Button or wired keypad (optional) The red or blue wire should be inserted into either O/S/C terminal, the white wire into the other one." Screen Shot 2016-03-31 at 11.03.24 PM.png
 

Dodgydave

Joined Jun 22, 2012
9,458
I would say that the video intercom relay can be altered, try looking at the Com terminal, and remove the link to its supply, that will make it a voltage free contacts. Otherwise its using a 12v relay powered from the video unit, you could parallel the coils up, or use the No and battery negative supplies.
 
Last edited:

wayneh

Joined Sep 9, 2010
16,399
Great! Thank you everyone. Wayneh - how do I do this without a relay?
As double D said in #4, you can eliminate the connection of common to the intercom's power supply. When the intercom's relay closes the circuit, it will simulate a manual push button being pressed.

You might not even have to alter the intercom, but more testing would be needed. The push button might normally connect one of the gate inputs to ground. And you might be able to connect the commons of both devices. If that's all true, then your intercom is already able to do the job. But again, you'd need to confirm what the switch is doing and whether you can connect the two grounds without current flowing from one power supply to the other.
 
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