door lock relay problem

Printed From: the12volt.com
Forum Name: Relays
Forum Discription: Relay Diagrams, SPDT Relays, SPST Relays, DPDT Relays, Latching Relays, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=24213
Printed Date: July 07, 2025 at 4:45 PM

Topic: door lock relay problem

Posted By: mgeneral2000
Subject: door lock relay problem
Date Posted: January 08, 2004 at 8:50 PM

I recently bought actuators from e-bay to add to my alarm system. They are the type that have 2 wires and to lock and unlock the two wires need to switch polarity. I have tried the combinations for the relay hookups on the site and every time i hook the ground up to both 87a it blows the fuse on the +12 line. any advice would be greatly appricated.

Replies:

Posted By: dusted340
Date Posted: January 08, 2004 at 9:32 PM

What happens when you hook it up without a relay. could be a short in actuators.
If it works ok without relay check wires again, relays, switches

good luck

Posted By: auex
Date Posted: January 08, 2004 at 10:02 PM

That would mean that you have +12V at pin 30? That is wrong, here is a diagram that will help, hopefully.

posted_image

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Certified Security Specialist
Always check info with a digital multimeter.
I promise to be good.
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I've been sick lately, sorry I won't be on much.

Posted By: mgeneral2000
Date Posted: January 09, 2004 at 1:24 PM

auex]T wrote:

at would mean that you have +12V at pin 30? That is wrong, here is a diagram that will help, hopefully.

I have it hooked up exactly like the above diagram, except i don't have the 87a's hooked up to a ground because every time i hook those up to a ground it blows the fuse. without it hooked up to the ground it works fine the currents alternate for lock and unlock, untill i hook up the wires to the actuators. After i hook up the wires to the actuator it shows a +12 reading on both 30's. any ideas? please help, thanks

Posted By: xetmes
Date Posted: January 09, 2004 at 1:32 PM

you most likely have SPST relays instead of SPDT

Posted By: auex
Date Posted: January 09, 2004 at 6:38 PM

That would explain it.

-------------
Certified Security Specialist
Always check info with a digital multimeter.
I promise to be good.
Tell Darwin I sent you.

I've been sick lately, sorry I won't be on much.

Posted By: Sandungero24
Date Posted: February 25, 2004 at 8:23 PM

this diagram only applies if the "trigger" wires from the alarm provide a pulsed ground (-) to lock/unlock. If they provide a pulsed positive (+) instead, you will have to ground the opposite 85/86 terminal to allow the relay to work. Actually, my alarm allowed me to use either pulsed (-) or (+), I just chose to use the (-).

Posted By: brnichols03
Date Posted: February 25, 2004 at 10:07 PM

get a DEI 451M door lock relay module on ebay

put the WHITE/ black and BROWN / black wires to ground

put the purple and PURPLE / black wire(s) to 12v

the remaining blue/black and GREEN/ black wires will be your lock and unlock output wires which can be ran to the actuators