Hardwiring a PSU to a simple switch

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holli4pirating

[H]ard|Gawd
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Nov 13, 2005
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When hardwiring a psu to power up and run without being connected to a motherboard, I know that a connection between the power on pin and a ground pin must be made. But once the psu is on, should that connection be maintained or broken? I was under the impression that maintaining the connection would cause the psu to shut off, like holding down the power button on a computer. Therefore it would follow that the connection would need to be made and then broken, but I wanted to make sure.
 
The connection can stay on. It would only shut off if the connection is broken.
 
I see... So to turn it on then off, I'd have to make the connection, leave the connection on or break it, then make the connection again?
 
If you are using the method of connecting the Green wire to Ground (Black), the connection must be maintained for the PSU to stay on.

ie
no connection, PSU is off.
connected, PSU is on.

I think the motherboard provides the logic to flip the on/off state with a simple once only connection like the power switch.
 
Chernobyl1 said:
If you are using the method of connecting the Green wire to Ground (Black), the connection must be maintained for the PSU to stay on.
Click to expand...
This is the method I'd be using. Would breaking the connection turn it off?
 
oops, I edited my last post after you replied.

Yes, breaking the connection turns it off.
At least it does on my PSU (I just tested).
Given that its a standard ATX PSU, they should all be the same.
 
Yes. You're thinking of the power switch to mainboard which is only a momentary switch. But green is always grounded when the motherboard turns the PSU on.
 
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