HP DPS-800GB or ATSN 7001044-Y000 Power supply

Recently I got my hands on a big batch of HP DPS-800GB & ATSN 7001044-Y000 Power supplies.

These PSU’s deliver a solid constant +/- 80Amps @ 12VDC

Great in combination with high power chargers for charging (multiple)big LiPo packs.

To activate (turn on) these psu’s, 1 small wire is needed to solder from top to bottom of the pcb.

To make a good PSU for my charging system I needed 24V.
But connecting them in series and mounting them togheter is a bit of tricky.
This due the fact the negative side of the DC output is connected to the chassis / earth pin at the 110/230VAC side.
In the past I have used DPS-600 PSU’s where the negative DC side was rather easy to disconnect from the chassis by removing some PCB copper traces at the top and bottom of the PCB.

But with the  HP DPS-800GB or ATSN 7001044-Y000 that is not so easy to do.
This because the PCB of these PSU’s  are multilayer PCB’s.

Only option is to isolate everything that could connect both PSU’s housings togheter.

Luckily this is simple.

1. Cut the Earthing on the 110/230VAC side.
2. Place isolation between both PSU chassis.

WRONG
Earth wires are connected, and both chassis are touching each other.

 

WRONG
Earth wires are connected, and both chassis are isolated from each other.

 

CORRECT
Earth wires are cut and not used, and both chassis are isolated from each other.

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