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point me to the correct relays


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bradleys 
Member - Posts: 4
Member spacespace
Joined: October 21, 2009
Location: Texas, United States
Posted: October 21, 2009 at 9:28 PM / IP Logged  

I want to create a specific 12v circuit.

I have two power inputs.  Input 1 and Input 2, I need one power output.  Input 1 is a lead off the the main power, input 2 is a lead from the kill switch.  I want to add a warning bell that will indicate that main power is still on when the kill switch has been turned off.  I am looking for:

  • When Input 1 has power and Input 2 has no power - output should have power.
  • When input 1 has power and Input 2 has power - output should not have power.

Is there a relay or combination of relays that will help me do this?

i am an idiot 
Platinum - Posts: 13,709
Platinum spaceThis member consistently provides reliable informationspace
Joined: September 21, 2006
Location: Louisiana, United States
Posted: October 22, 2009 at 3:33 AM / IP Logged  

That will be a piece of cake.  I will draw you  a diagram tonight.  It will require 2 relays.   Do you want a 5 second delay before it sounds the buzzer?  That will require a few more parts.

bradleys 
Member - Posts: 4
Member spacespace
Joined: October 21, 2009
Location: Texas, United States
Posted: October 22, 2009 at 11:09 AM / IP Logged  

A five second delay would be very cool.  Yes...

To answer your question: "Will input 2 ever be powered without input 1 being powered?"  NO

i am an idiot 
Platinum - Posts: 13,709
Platinum spaceThis member consistently provides reliable informationspace
Joined: September 21, 2006
Location: Louisiana, United States
Posted: October 22, 2009 at 8:19 PM / IP Logged  
I re-read your post and figured that out.  That is why I deleted the question.  I will have to work on the delay later.  The 2 relays to do exactly as you asked need to be wired as follows.  Input 1 to terminal 86 of relay 1.  85 of relay 1 is to be grounded.  Input 2 to terminal 86 of relay 2.  85 of relay 2 needs to be grounded.  Fused 12 volts to terminal 87 of relay 1.  Terminal 30 of relay 1 is to be connected to terminal 30 of relay 2.  87A of relay 2 is the positive output that powers your buzzer, beeper or whatever the audible device may be.
bradleys 
Member - Posts: 4
Member spacespace
Joined: October 21, 2009
Location: Texas, United States
Posted: October 22, 2009 at 10:25 PM / IP Logged  
Fantastic...  Do I need SPST relays with dual outputs (87 and 87A) or the SPDT relays?
i am an idiot 
Platinum - Posts: 13,709
Platinum spaceThis member consistently provides reliable informationspace
Joined: September 21, 2006
Location: Louisiana, United States
Posted: October 23, 2009 at 5:54 AM / IP Logged  
Relay 1 can be SPST. (87 terminals in 2 locations, or missing the middle 87A connection) Relay 2 has to be SPDT.  (87 and 87A)
bradleys 
Member - Posts: 4
Member spacespace
Joined: October 21, 2009
Location: Texas, United States
Posted: October 26, 2009 at 11:01 AM / IP Logged  

Thanks!  I picked up the Relay's and will wire them together for a quick test some evening this week.  YOU HAVE BEEN A HUGE HELP!

I really appreciate it...

Scott


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