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#1 pluto_26 Dec 04, 2010 10:23 PM

COnverting Server Power Supply - EMERSON
 
1 Attachment(s)
I was able to get a couple of these power supplies and would like to convert them.

This thread has been very helping but I still need a little more help to get it to work fully.

The power supplies are: rated at +12.v ---- 55.0A MAX
at +3.3Vco -- 0.2A MAX
EMERSON Module 7001484-J000 or
ACBel FS7923

These were removed from IBM X-Servers.

I have attached a image of the connections 8 signals top /bottom

01 02 03 04 05 06 07 08 P-P-P-P-P-P-P-P-P <--Top
09 10 11 12 13 14 15 16 p-p-p-p-p-p-p-p-p <--Bottom

if I short 07 and 15 the fan starts but as soon as I place any real load 2amp
or more the power supply shutsdowns. I do get a reading from the power pins between 12.2 - 12.4

when I try to get readings of these pins these are teh readings:

Top
01 02 03 04 05 06 07 08
G 4.2 G G 4.8 G G G G = reading 0.0 V

Bottom
09 10 11 12 13 14 15 16
0.2 G 0.2 G 0.1 4.6 4.6 4.6


Electricity is not my thing, understand the basics

ANy help or suggestions on what to try or how I can determine the pins would be greatly appreciated.

Thanks

#2 Marion Dec 05, 2010 01:28 PM

Some computer power supplies require a sizable load on the 5 volt line for proper operation.

I use 3 or 4 10 Ohm, 10 Watt resistors, all in parallel connected across the 5 volt line -- between the red and black wires. Hope this helps..

#3 highflyerbill Dec 06, 2010 08:39 AM

You mite want to go to www.wikihow.com/convert-a-com...b-power-supply pretty good article , should be all you need .

#4 pluto_26 Dec 06, 2010 05:56 PM

thanks, that site focuses on ATX power supplies I am trying to convert a server power supply. seems to be just enough diferrent.

#5 pluto_26 Dec 08, 2010 02:56 PM

Does anyone know ow to test the pins and what pins based on voltage I should try to jump?

I seem to be missing a third one to keep the load.

#6 lipoflyer Dec 09, 2010 04:19 AM

there are some good threads here for the HP server PSU's

#7 Maddin123 Mar 27, 2014 03:04 PM

Hi, I also have one of these PSUs here and no idea about the pinout.

Is there something new you have found out pluto_26?

#8 Mike Dubovsky Mar 27, 2014 04:46 PM

A better place to look.
 
This thread may be more informative to your questions

http://www.rcgroups.com/forums/showthread.php?t=1292514

#9 Maddin123 Mar 27, 2014 06:51 PM

I've figured it out. Top row, pin 1 and 2 and you will have stable 12V output.

I've just tested it with 2 chargers, each 150W, no problems so far.


Many greetings from Germany

#10 doug.wagner Jul 10, 2015 03:01 PM

Quote:

Originally Posted by Maddin123 (Post 27915541)
I've figured it out. Top row, pin 1 and 2 and you will have stable 12V output.

I've just tested it with 2 chargers, each 150W, no problems so far.


Many greetings from Germany

What does that mean?
"Top row, pin 1 and 2"...do you short them together?
Connect with a resisitor?
Find 12V across the pair?

#11 doug.wagner Jul 24, 2015 07:56 PM

Emerson 7001484
 
I finally got the stones up to try shorting upper pins 1 and 2 together, and sure enough, the LED labeled DC turns on (on the back), the fan turns on (very low) and there is +12V on the large copper pin, on the topside of the connector. Ground is at the large copper pin on the underside of the connector.
Right now I am charging four 3S batteries in parallel, at 12A with no apparent problems.
I think I'll put a small switch between pins 1 and 2, to use as an off/on switch.


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