How to start PSU without motherboard - Dell PowerEdge 6850 1470W

[nuvatchai]

Hello,

I need to use 12 voltage. But I do not know how to make it start with a PIN?

Sorry, My English is not good.

 

[rikkitikkitavi]

Pinout is similar to other dell server supplies. Perhaps. Just more powerconnectors to supply more amps.

Google for dell+ 700W + 2850 you find info, especially at rcgroups.com


Note this is a fanless supply, the server rack chassi has the fans tunneling air through the supplyies when they are fitted. Dont expect to pull more than tops 10% of rated current without some heavy blowing, expect about 90% efficiency.

 

[DQ828]

I suggest you google it threw a fair bit of info out there, you will need to have a load on one of the pins or it won't start I used a resistor for the load with a different computer psu

 

[rikkitikkitavi]

Could be. My dell supplies, 670W starts fine without any load, just connecting three pins (grounding PSKILL and PSON)

First is good to check which pins are GND. Chassi is GND, half of the power connectors are GND and a lot of the smaller signal pins.

 

[nuvatchai]

I have read form :
http://static.rcgroups.net/forums/attachments/6/9/1/2/6/a5980505-192-DPS-1470 Full Pinout final.jpg
A simple high quality 12Volt 100Amp Power Supply- Part1 - Page 153 - RC Groups
Power supply 26V 121A - 2x DELL POWEREDGE 6850 - HeliFreak

I'm get by below picture. Please confirm is that Correct or Incorrect.
If incorrect please provide an accurate picture for it.

----------------
Sorry, My English is not good.

 

[DQ828]

Have you tried shorting A1 & B6 to ground?

Your image is not showing up.

Your English is great compared to my, any other language 🙂

 

[nuvatchai]

I have upload new image.

 

[DQ828]

I have upload new image.
[/QU
OTE]

I think you are correct with the pins you have chosen. I think the 5 large pins beside the 12v+ pins are the Ground, I would just check they are all connected together using a multimeter. If they are all connected together I would say they are ground then you could use one of them to check the small pins to see which ones are ground which I think would be A3. B1, B3 etc

 

[nuvatchai]

Thank you very much 🙂 I will try. And come back for confirm again.

 

[rikkitikkitavi]

I think you are riight too. Dont use body as gnd connection for any large currents, use the six connectors for this. Each is rated to abot 20-25 Amps. Parallell as needed.

 

[rikkitikkitavi]

Body is also connected to PE , and GND secondary side via a few screws holding PCB to the chassis. Replace these with nylon screws you get a 12 V supply floating from PE, and then it is possible to stack for higher voltages. Done it myself. But with schottky diodes on the + 12V rail out for reverse current protection.