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Power supply relay

C

crazychicken

Platinum Member
What is the purpose of a relay to hook two PSUs together on the same switch? can i not just hook the hot and a ground from a molex of 1( the one plugged into the board) into the green and a ground of 2? or do i need the 12v relay in between?

please lmk asap

thanks alot
david
 


<< What is the purpose of a relay to hook two PSUs together on the same switch? >>


To power up both power supplies at the same time while still keeping each circuit separate.


<< can i not just hook the hot and a ground from a molex of 1( the one plugged into the board) into the green and a ground of 2? >>


No, that's not the same as grounding the green wire. Your method would try to deliver 12V to the green wire on the second PS.

Think of it this way. You take the green wire and touch it to a ground on the same PS. The PS turns on.

Now, imaging taking the green wire and a ground wire and placing a 12V battery between them. Doesn't sound right, does it?
Not only would it not work, most likely you will fry something.


<< do i need the 12v relay in between? >>


Yes. That is the only way you can ground the green wire using another PS.
 
Actually, according to this Article(link is to page 3 and provides diagrams/pics also), the only reason for the relay is to keep from having to cut the wires on the power supplies. Here is another link to a second article for reference.

Here is a quote:



<< You can achieve the same effect without a relay. But you will need to cut and reconnect some of the ATX's connection wires, which makes the modification permanent. Using the technique I explained previously, you can unplug everything and both power supplies are ready to be used on their own. But if you can't afford a relay or if you don't mind messing up your power supplies, follow the instruction below. What you have to do is to connect pin 14 from both power supplies together. So whenever pin 14 from the first one is grounded (when turned on) the second power supply will also turn on. You also have to connect a ground from each ATX connector together. >>



hth,
eplebnista
 
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