Power supply 26V 121A - 2x DELL POWEREDGE 6850

[kenobi36]

Recently made bought in good price 2 server power supply dell Poweredge 6850
Standard paramenters :
1470W
12V
121A.
37x20x3,5cm
Weight: Heavy

Both were different but its not a problem.
Fist one:




Turn it on by connecting together two botom pins on the lest side and second from the bottom on the right side pin.


Inside:
Red arrow - voltage regulation
Yellow arrow - ground isolation.


Second has alu chasis, made in Mexico and its level 6




Inside




Together


Connectors


Back side


They don't have built in fan's
Bad news is that we need to buy new fan's becouse they heat up strongly even without load.
Good news is we don't have to cheet electronics to make fans work quiet and we can use any lor rpm fan's.



I used two 70x70x15mm fan's, only 18dB


Done

[69fordf100]

Can you show your final wiring? I just got the 1st shown and need to see how you did your power regulation.
Thanks

[kenobi36]

I dont exactly understand what you want to know.
Ther is no power regulation. You can change only voltage a little.

[69fordf100]

I got the wires all soldered in and I found the pot that raises the voltage. Worked great. For 10minutes. I was testing out the supply on a car audio amp of only 300 watts and I heard a sound like a gunshot.. Needless to say, the power supply and the amp shut down., but the supply would never turn back on. Upon further investigating, I found a blown MOSFET inside. One of the large mosfets on the power rail completely blew to peices. Then I remembered you recommended a fan or two for the heat. Well just got two more of these in. Hopefully these will last.

On the power regulation, I meant voltage adjustment. I found it in the pic.

[power_puller]

Questions:
1. Didn't you have to (at least) connect the load sharing pins on each 6850 to the other in order to parallel these supplies safely?!
2. Do you know how to bypass (or defeat) the OVP in these units in order to get ABOVE the 13.6 vdc (top setting) or know someone that does ("Xandrios" of RCGroups did, but hasn't been available for quite sometime now, I understand. and apparently, no one else is tech saavy enough to help).?
Thanks!
power_puller

[kenobi36]

1. I have serial connection
2. No, 25-26V is enough for me.

[chakram]

Hi kenobi36,
I have same Dell PSU (China). I have now problem with it! It worked for 4 months with 800 Watts but today was 400 Watts added. After more then half of hour working Power-Supply's Fault Indicator switched on and don't work! Can you help? Did you have this problem?

[elektrinis]

Hello,

Interesting topic. Just picked up a couple of these supplies (Mexico), but unable to enable them. AC OK LED is on, DC OK is off and no output.
I have tried numerous combinations:

A1+A2+B6 (as description) - no effect.
A1+B1+B6 (as pictured) - no effect.

I have 1.45V on A1 and B6, 0V on all others.

How do I switch it on?

[Mateyhv]

Those PSUs look good but without fans I can't see how the can achieve 1400 Watts without melting for some time without melting.

I would perfer some HP DPS-1200FB 12volts 1200 watt. They are cheap, they are small, have fans (sometimes very noisy) and are some nice power monsters. As always keep in mind that whenever two units are set in series to achieve +25v the ground of the second unit must be floated, otherwise the positive from the first unit will be directed to ground from the negative of the second unit and thus shortcircuited.