24V power supply from 2x DPS-700CB

[willkho]

Hi all,

I'm trying to build a 24V power supply using HP DPS-700CB A power supply.
I've googled around the wiring and found out it's not too hard with the wiring.

I'm just want to make sure few things before I get started:
1. based on the image I found, there are 2 set of negative output and 2 set of positive output, does it mean I can use any of those? Can I plug 2 chargers to the psu? (please refer to link for the pic)
https://www.helifreak.com/attachment...1&d=1334201160

2. I have two of this DPS-700CB, so I will get 4 sets of those output. I'm wondering how to connect them together to get 24V?

many thanks
Will

[willkho]

hi again all,

I just made a diagram.
Just want to have a confirmation if I got it right.



many thanks

[gabeoravitz]

Actually you only need to remove the "earth pin" (ground) from the 2nd supply. This will work but it is not safe. You should never remove the AC ground. A malfunction of the PS could kill you if you touch it wrong.

You should isolate the DC ground inside the 2nd supply instead. I did this a few times before on these same supplies. Basically what you want to do is to take apart the 2nd supply in the series and remove all the screws from the PCB to the metal case. You should replace them with plastic screws, or in my case, I just used shims to keep it away. When you connect the supplies in series, if they now both work instead of flipping off from short circuit protection, you did it right.

In my opinion, the cases should always remain grounded to earth.

[pctomlin]

Totally agree with Gabe, very unsafe to remove the AC ground. Here is a link that shows what screws need to be isolated on the DC connection.

http://www.ajvde.nl/forumfoto/Server...ifications.pdf