Convert Server Power Supply - RC Groups
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Jul 07, 2009, 06:26 PM
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Convert Server Power Supply

I have two server power supplies that were going to be thrown out. I'd like to convert them to bench power supplies if I can, if not bin them. I cannot find any info on the internet regarding the pinouts so I'll provide my findings and see if someone can help. As of yet I cannot get it to power up.

They are Compaq parts and here is the info on them:

Compaq Model DPS-450BB
Series ESP104
P/N: 401401-001
Spare/N: 101902-001

However I opened one up and also see Delta Model number DPS-450BP

They have two connectors on them. One is a 24pin that looks like an ATX 24 pin but has a different wire arrangement. The other is a serial port (RS232) 15 pin connector. Both are built into the back of the case since it is a hot swappable PSU.

Wires on the 24 pin are:

B B B B B R R Br Br Y Y Y
B B B B R R Br Br Br Br Y Y

The serial connector has voltage on the following pins.

8 pins top and 7 pins bottom

0v 0v 0v 0v 0v 0v 1v 0v
.2v .2v 0v .1v 5.2v 5v 1v
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Jul 08, 2009, 03:11 PM
Registered User
Don't throw them out I saw the info some where in this site. You can get 3v, 5v and 12v some have plus and minus so you can get voltage combinations.
I dont have the colour coding with me but you need to connect two of the wires so switch the system on. And a 12v (car bulb) on the 5v circuit to provide the activating resistance.
You will find the info.
Jul 08, 2009, 03:24 PM
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Yeah, I know.

I have converted plenty of ATX power supplies and know how. If you read the post, these are server power supplies with non standard connections that I was wondering if anyone else knew about.
Jul 08, 2009, 03:26 PM
Dave the Rave
dmccormick001's Avatar
You're thinking about a regular PC power supply. These are server power supplies.
Jul 09, 2009, 06:43 AM
Registered User
Andy W's Avatar
What brand and model of server did they come out of?
Jul 09, 2009, 07:09 AM
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They came out of Compaq Proliant DL580 servers but I belienve they also are used in the 6400R servers as well.
Jul 14, 2009, 06:39 PM
Soil Sampler
FlynFoam's Avatar
mt 100,
This may be of some help.
Jul 14, 2009, 08:01 PM
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Let me REITERATE for all the new folks. These are SERVER power supplies, not AT, not ATX.

Update, the RS232 connector has voltage on only two pins. The top row second to the right side and far right bottom row. Top one is about 5v and bottom is about 3v.

I don't think I am going to get them to power up.
Jul 14, 2009, 09:01 PM
Registered User

Google is our friend
Jul 14, 2009, 09:11 PM
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Already read that thread and although that PS is a server one it doesn't have the same rear connectors on it.
Jul 15, 2009, 10:58 AM
Dave the Rave
dmccormick001's Avatar
If you have only the two connectors, a 24-pin ATX style and an RS232, it doesn't sound like your unit has the connectors you would expect to find on a unit capable of delivering the higher currents most server PSUs do. If you look at the other examples of server PSUs that have been successfully converted, they seem to all have some kind of spade or other high-amp connectors on them. Is it possible that the PSUs you have are more like conventional PSUs that supply multiple voltages at lower currents? If so, maybe there's a "sense wire" or something like that similar to the AT/ATX types. Just a thought.

Edit: Oh crap, nevermind. I just saw a picture of this unit.
Last edited by dmccormick001; Jul 15, 2009 at 11:06 AM.
Jul 15, 2009, 11:15 AM
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Yeah, I poked at them last night and couldn't get a power on. These things should deliver 26 amps. I'll keep poking but I don't think I am going to find the power on signal without a lot of trial and error.
Jul 15, 2009, 09:43 PM
Dave the Rave
dmccormick001's Avatar
Can you get any clues from taking the cover off of it and having a look around inside it? On the At/ATX style PSUs, at least most of the time, the "power good" wire actually has the letters "PG" printed on the pc board next to the pad to which the wire is connected.
Jul 15, 2009, 09:50 PM
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There is stuff on the board(s) but I don't see indication of the power good signal. Still looking, will look for "PG" as suggested thank you.
Jul 16, 2009, 02:19 PM
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I pulled another one from an IBM today. It's a Delta DPS-250HB and has a flat circuit board connector on the back. I think it is a 24 pin ATX in circuit board form. We shall see.

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