How to use ATX powersupply w/o motherboard attchd?

[CB]

I wish to use an ATX power supply in a disk-drive cabinet. Is there a
straightforward way to supply the power-good and/or load signals I
believe are required to enable the supply to function properly?



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[Jeff Sprinkle]

"CB" <cbaisan@dakotacom.net> wrote in message
news:3fe51c6b$1_1@corp.newsgroups.com... I wish to use an ATX power supply in a disk-drive cabinet. Is there a straightforward way to supply the power-good and/or load signals I believe are required to enable the supply to function properly?

Hook up a switch between wires 13 & 14

[daytripper]

On Sat, 20 Dec 2003 21:09:32 -0700, CB <cbaisan@dakotacom.net> wrote:
I wish to use an ATX power supply in a disk-drive cabinet. Is there astraightforward way to supply the power-good and/or load signals Ibelieve are required to enable the supply to function properly?

Nah, all you have to do is ground pin 16 of the 24 pin connector to turn the
supply on. The power good signal on pin 8 of the same connector is an output,
not an input. Use it to drive an LED or leave it unconnected.

And if you want the outputs to regulate, you should connect the 3.3V and 5V
sense lines (on pins 13 and 22, respectively) to the corresponding power leads
(on pins 1 and 4, among others).

Do mind the 5VSBY voltage on pin 9, even when the supply isn't "on"...

/daytripper

[daytripper]

On Sun, 21 Dec 2003 04:33:14 GMT, "Jeff Sprinkle" <jaylo@ilya.net> wrote:
"CB" <cbaisan@dakotacom.net> wrote in messagenews:3fe51c6b$1_1@corp.newsgroups.com... I wish to use an ATX power supply in a disk-drive cabinet. Is there a straightforward way to supply the power-good and/or load signals I believe are required to enable the supply to function properly?Hook up a switch between wires 13 & 14

Oh, crap. You're right, I'm looking at a server power supply.

My bad.

[daytripper]

On Sun, 21 Dec 2003 04:38:11 GMT, daytripper <day_trippr@REMOVEyahoo.com>
wrote:
On Sat, 20 Dec 2003 21:09:32 -0700, CB <cbaisan@dakotacom.net> wrote:I wish to use an ATX power supply in a disk-drive cabinet. Is there astraightforward way to supply the power-good and/or load signals Ibelieve are required to enable the supply to function properly?Nah, all you have to do is ground pin 16 of the 24 pin connector to turn thesupply on. The power good signal on pin 8 of the same connector is an output,not an input. Use it to drive an LED or leave it unconnected.And if you want the outputs to regulate, you should connect the 3.3V and 5Vsense lines (on pins 13 and 22, respectively) to the corresponding power leads(on pins 1 and 4, among others).Do mind the 5VSBY voltage on pin 9, even when the supply isn't "on".../daytripper

[committing the heinous crime of replying to my own post...]

The above works if you actually had an EPS12V supply (which is what I have).
If you try it on an ATX supply it'll probably let all the smoke out. That
would be bad.

As was correctly provided elsewhere ;-) ground pin 13 and you're in business.
5VSBY is still on pin 9.

/daytripper (smack me upside my haid with a crossover cable)

[CB]

daytripper wrote:
On Sun, 21 Dec 2003 04:38:11 GMT, daytripper <day_trippr@REMOVEyahoo.com> wrote:On Sat, 20 Dec 2003 21:09:32 -0700, CB <cbaisan@dakotacom.net> wrote:I wish to use an ATX power supply in a disk-drive cabinet. Is there astraightforward way to supply the power-good and/or load signals Ibelieve are required to enable the supply to function properly?Nah, all you have to do is ground pin 16 of the 24 pin connector to turn thesupply on. The power good signal on pin 8 of the same connector is an output,not an input. Use it to drive an LED or leave it unconnected.And if you want the outputs to regulate, you should connect the 3.3V and 5Vsense lines (on pins 13 and 22, respectively) to the corresponding power leads(on pins 1 and 4, among others).Do mind the 5VSBY voltage on pin 9, even when the supply isn't "on".../daytripper [committing the heinous crime of replying to my own post...]

Noted ;)
The above works if you actually had an EPS12V supply (which is what I have). If you try it on an ATX supply it'll probably let all the smoke out. That would be bad. As was correctly provided elsewhere ;-) ground pin 13 and you're in business. 5VSBY is still on pin 9.

Thanks, got it.
/daytripper (smack me upside my haid with a crossover cable)



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[CB]

Jeff Sprinkle wrote:
"CB" <cbaisan@dakotacom.net> wrote in message news:3fe51c6b$1_1@corp.newsgroups.com...I wish to use an ATX power supply in a disk-drive cabinet. Is there astraightforward way to supply the power-good and/or load signals Ibelieve are required to enable the supply to function properly? Hook up a switch between wires 13 & 14

Thanks much.



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[CB]

Jeff Sprinkle wrote:
"CB" <cbaisan@dakotacom.net> wrote in message news:3fe51c6b$1_1@corp.newsgroups.com...I wish to use an ATX power supply in a disk-drive cabinet. Is there astraightforward way to supply the power-good and/or load signals Ibelieve are required to enable the supply to function properly? Hook up a switch between wires 13 & 14

Oops, one more question - that should be a (not sure of the terminology
here) momentary contact switch? vs an on-off type?



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[daytripper]

On Sat, 20 Dec 2003 22:28:02 -0700, CB <cbaisan@dakotacom.net> wrote:
Jeff Sprinkle wrote: "CB" <cbaisan@dakotacom.net> wrote in message news:3fe51c6b$1_1@corp.newsgroups.com...I wish to use an ATX power supply in a disk-drive cabinet. Is there astraightforward way to supply the power-good and/or load signals Ibelieve are required to enable the supply to function properly? Hook up a switch between wires 13 & 14Oops, one more question - that should be a (not sure of the terminologyhere) momentary contact switch? vs an on-off type?

It's not momentary - you have to hold the enable low. Applies to both ATX and
EPS12V supplies...

/daytripper

[CB]

daytripper wrote:
On Sat, 20 Dec 2003 22:28:02 -0700, CB <cbaisan@dakotacom.net> wrote:Jeff Sprinkle wrote:"CB" <cbaisan@dakotacom.net> wrote in messagenews:3fe51c6b$1_1@corp.newsgroups.com...>I wish to use an ATX power supply in a disk-drive cabinet. Is there a>straightforward way to supply the power-good and/or load signals I>believe are required to enable the supply to function properly?Hook up a switch between wires 13 & 14Oops, one more question - that should be a (not sure of the terminologyhere) momentary contact switch? vs an on-off type? It's not momentary - you have to hold the enable low. Applies to both ATX and EPS12V supplies...

Thanks daytripper.



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[The little lost angel]

On Sat, 20 Dec 2003 21:09:32 -0700, CB <cbaisan@dakotacom.net> wrote:
I wish to use an ATX power supply in a disk-drive cabinet. Is there astraightforward way to supply the power-good and/or load signals Ibelieve are required to enable the supply to function properly?

Apart from what everybody else have said;

Most ATX PSU are cross regulated on the +5V/3.3V line. So if the hard
disks don't draw enough on the +5V to keep the +12V high enough, you
might want to add a load resistor on the +5V line.


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[CB]

The little lost angel wrote:
On Sat, 20 Dec 2003 21:09:32 -0700, CB <cbaisan@dakotacom.net> wrote:I wish to use an ATX power supply in a disk-drive cabinet. Is there astraightforward way to supply the power-good and/or load signals Ibelieve are required to enable the supply to function properly? Apart from what everybody else have said; Most ATX PSU are cross regulated on the +5V/3.3V line. So if the hard disks don't draw enough on the +5V to keep the +12V high enough, you might want to add a load resistor on the +5V line.
Thanks, the disks draw enough and jumpering the #13 and #14 pins allows
me to just use the rocker switch on the back of the unit for power
on/off. Working just fine.



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