2 12V Ins With 1 12V Out Wiring

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=57369
Printed Date: May 09, 2024 at 12:44 AM

Topic: 2 12V Ins With 1 12V Out Wiring

Posted By: kc0rkx_finch
Subject: 2 12V Ins With 1 12V Out Wiring
Date Posted: June 09, 2005 at 3:06 PM

The relay to be used is found here

https://www.radioshack.com/product.asp?catalog%5Fname=CTLG&category%5Fnam....

I need to wire this relay to have (2) 12 Volt Inputs and (1) 12 Volt Output. Power is always to be taken from Input #1 unless its power is cutoff. Then the relay needs to switch automatically to Input #2. Its for a battery backup system. If the AC power is shutoff and my DC Power Supply shuts off, I need the battery backup to kick in instantly without me having to flip a switch in case im not home at the time.
I dont know if the image uploaded right or not but i guess well find out.

Replies:

Posted By: kc0rkx_finch
Date Posted: June 09, 2005 at 3:09 PM

i guess it didnt plz tell me how to upload them right and ill post it

Posted By: soundman65
Date Posted: June 10, 2005 at 2:55 AM

not sure of the connections for that as I can't see a pic... but it would be simple using a bosch 5-pin spdt relay.

dc supply + to pins 86, 87a
dc supply - to pin 85
batt backup to pin 87
12 volt output pin 30

Posted By: kc0rkx_finch
Date Posted: June 10, 2005 at 9:55 AM

when you say battery backup to pin 87, do you mean pos or neg to pin 87
Same with the 12volt output, pos or neg out???

Posted By: kc0rkx_finch
Date Posted: June 10, 2005 at 10:37 AM

never mind i igured it out thanx anywho though