I got my hands on a Delta Hot-Swap Server Power Supply that's capable of 400W or 33A on the 12v rail.

I've been tinkering with it for a few hours now and can't seem to find what pins are for the Pson and Pskill.

I went down through all the pins and measured them for continuity between ground and between themselves. (Found that all rails are isolated besides 12v, Neat!) I logged all that in This spreadsheet.

I just wanted to know if anyone has ever had success with this type of PSU, or if anyone knows of some resources that could help me. I already tried following this guide to single out the pins, but I still have not gotten anything.

Any ideas or help greatly appreciated as always.

Progress Edit:

I currently have a 5.7K resistor between pin 9 and 11 on the spreadsheet. With this resistor here, I get 1.7V on the 12v rail. Now, if I short these pins, the output on the 12v rail shoots up to 5v. What gives?


With the information found previously, I decided to see what would happen if I put a higher voltage on that pin #9. Sure enough, connecting pin 4 and pin 9 together gets 8.5V on the 12v rail. Still weird though. But we're getting somewhere!

  • \$\begingroup\$ Why do you asume that the different rails are isolated? Also, these supplies could offer some form of control settting to maximize load balancing when multiple are used at the same time (I believe, though I am not sure, the generally don't run a single supply all the time: they make the supplies installed share the load, either by alternating or by just putting them in parallel). \$\endgroup\$ – Joren Vaes Aug 3 '17 at 5:54
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    \$\begingroup\$ Open it up, look at the board markings. The power on pin could be marked or obvious as it won't be grouped with other pins. \$\endgroup\$ – Passerby Aug 3 '17 at 6:25
  • \$\begingroup\$ Much appreciated. I did open it up and took a peek inside but found that the board was super dense. None of the pins are marked, the most I have to judge by is their length, and there's like, 5 shorter pins. I think I will have to take it apart again and see what I can find, but I assumed the rails were isolated because each pin that had 5v, and 3.3v did not have continuity between each other. Only the 12v pins did. \$\endgroup\$ – Bradyn Claycomb Aug 3 '17 at 13:40

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