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ATX PS turns off when blue(-12V) and red(+5) get loaded
Dec 3, 2009, 3:29 PM
I am using an extra ATX power supply to power some surveillance cameras that need about 17V to run.
My problem is that the power supply turns off when I try to power the cameras.
I created two rails to power the cameras, one connected to the ATX blue wire (-12V) and the other to red (+5V). A multimeter shows 16V between the two rails -- good.
I also tied the green wire to ground so that the power supply will turn on.
As soon as I connect even one camera, though, the fan stops on the power supply, and I get no more voltage.
I tried connecting a smaller "wall-wart" 17VDC power supply to my rails, and that works fine.
So why is my ATX power supply turning off??
Dec 3, 2009
Dec 3, 2009
turns blue loaded
Dec 3, 2009, 4:35 PM
Because the -12 volt line generally produces no more than 1 amp. You are overloading it.
Dec 3, 2009, 6:21 PM
JSC, I think you're right. I found that the cameras will run okay with just 12V, so using yellow (+12V) and black (0V ground) works too, and that doesn't cause the PS to shut off. Thanks!
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