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Old Feb 21, 2011, 09:15 PM
TJin(Guy + Tech)
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Looks like you are getting some good use of my photo.
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Old Feb 21, 2011, 09:19 PM
Dale
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Hoped you don't mind, it saved me a bit of work and it is nice to have continuity in the process of figuring these things out.
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Old Feb 21, 2011, 09:41 PM
TJin(Guy + Tech)
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Credit would have been nice but otherwise no I don't really care.
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Old Feb 21, 2011, 10:18 PM
Dale
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Credit has been added.

And, thanks for keeping up your site, I have found many useful tidbits and I have found your reviews useful.
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Old Feb 21, 2011, 11:23 PM
TJin(Guy + Tech)
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No problem and thank you for figuring out the fan switch deal!
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Old Feb 23, 2011, 10:15 PM
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I posted this one the Dual Power supplies thread. But my Power supplies are the same as these in this thread.

http://www.rcgroups.com/forums/showp...&postcount=424

Can anyone confirm i have the right DC ground?

Thanks for your time and help,
Nick
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Old Mar 11, 2011, 02:55 PM
Steven
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Converted Dell ASTN 7000245 Poweredge 6650 PS?

Converted Dell Poweredge 6650 PS for 72 amps at 12v.
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Old Mar 11, 2011, 04:19 PM
ancora imparo
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Melbourne, Australia
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Thanks. i have added a link to the sticky thread for this one.

John
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Originally Posted by xandrios View Post
Converted Dell Poweredge 6650 PS for 72 amps at 12v.
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Old Mar 13, 2011, 09:42 AM
Dale
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Hi Xandrios,

Are there any high speed fan problems with this one?

Thanks,
Dale
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Old Mar 13, 2011, 03:06 PM
Steven
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Hi. There are no problems with high speed fans on the poweredge 6650 model. The fans are nice and quiet. It sounds like when you boot up a normal computer to me. Plus these models are dirt cheap on ebay. You can probably get 2 for like $20 shipped. The 6650 are about twice the size of the HP PROLIANT DL580/ML570G3 that started this thread. Older technology I guess. And although there is one speed control pin on the 100 amp ML570G3, it only seems to be an output that runs up to 6v at max amperage drawn. It's the pin on column 3 row 1, if anyone is interested. The HP PROLIANT DL580/ML570G3 is actually good for 100 amps even at 120v. Amazing unit except for the necessity to internally modify those 2 black hole fans inside. Hope this helps ya.
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Last edited by xandrios; Mar 13, 2011 at 10:20 PM.
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Old Mar 13, 2011, 08:09 PM
Steven
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Fan control speed based on amperage draw from Poweredge 2850

Hello KiloOne. Instead of opening the Poweredge 2850 u could have done this and based the fan speed upon the amperage drawn from the PS.
The voltage of the speed controler out (green) pin {column 2, row 4} is relative to the amount of power being drawn from the power supply. Its peaks at around 6V. Maximum fan speed seems to be set at around 3v at the speed control in (red) pin {column 2, row 3}. So just create a voltage divider between the speed control out (green) pin and ground with a couple of 1k ohm resistors to get the 3v we need to control the fan. With this set up, the speed of the fan increases to maximum when the PSU is running full power. With a 1k ohm pot at R2, you can set the fans maximum speed depending on how much current you plan to draw. Makes for a very flexible fan speed control. Oh yeah. Original picture by tjinguy. Thank you.
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Last edited by xandrios; Mar 13, 2011 at 08:34 PM.
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Old Mar 13, 2011, 09:14 PM
Dale
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Xandrios,

Wow, I did not know about the c2r4 pin whose voltage varies with the power being drawn.

Very elegant external solution to the variable speed fan idea.

I have 11 more to mod so I will likely use this concept which saves a few dollars each by not needing the LM34DZ.

I still have to open them up though since I want to isolate the -ve output for series use. The 7000814-0000 can be modified for this fairly easily.

Again, great find. I have to believe that other supplies have these same pins too.

Dale
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Old Mar 14, 2011, 04:28 AM
ancora imparo
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Melbourne, Australia
Joined Jul 2005
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Oh Boy! If only someone could figure out which pins do this on the original 100A supply you would have our eternal gratitude.

John
Quote:
Originally Posted by KiloOne View Post
Xandrios,

Wow, I did not know about the c2r4 pin whose voltage varies with the power being drawn.

Very elegant external solution to the variable speed fan idea.

<snip>

Again, great find. I have to believe that other supplies have these same pins too.

Dale
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Old Mar 14, 2011, 08:04 AM
Dale
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Joined Jul 2004
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Naw, that would just up the price and make them harder to find , just kidding.

Looks like Xandrios is very close to your solution by his edits to #460.

Go Xandrios!

How is that for a thread that wanders and comes back.
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Old Mar 14, 2011, 10:45 AM
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Joined May 2004
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Hey jj604,
I was looking at your original conversion of the HP supply and had a question. How did you tie those heavy gauge output wires from the 12V blades into your Deans connectors? Looks like you did something under the heatshrink but it sure is a neat job. And is it standard operating procedure for these conversions to tie all the +12V blades together and all the grounds together to get the most capacity? Or do you just figure out how many chargers you want to power and figure your outputs from there? Thanks for any replies.

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