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What parts can I use to bring two 3750W UPS online in the following rack setup..?

Posted on 2011-03-18
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Last Modified: 2012-05-11
I am wiring two L6-30 plugs for
- TWO  Dell 3750W UPSs.  They are 208V in and out.   I want them because of their size and capacity.

http://www.dellups.com/DisplayUPSConfig.asp?oemUPSID=27&countryID=3&ResellerIDCode=1

However, they are going to power a rack with
6x PowerEdge 2970
2x PowerEdge 1950
and lots of peripherals....

All those run at 110Volts.

So, now I need a Power Conversion unit to make it all play together and I am running into trouble. Every PDU I find that outputs 110V also needs 110V input.     For example, everything here: http://www.apc.com/products/resource/include/techspec_index.cfm?base_sku=AP7902J

I want to use these UPSs but need a way to bring them down to 110V by the time they reach the machines; I thought i've seen APC UPSs do this....  am I going about it wrong or just trouble finding the right part?
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Question by:TrialWorks
8 Comments
 

Expert Comment

by:j33p3r
ID: 35169157
If you would use something like what this company offers to step down the voltage you should be ok.

http://www.starkelectronic.net/st500.html

I have no affiliation with this company, it was just the first site I found that had a good range of available step down transformers.

You need to work out your maximum demand for current and make sure you spec it out for the current on the output side of the transformer as this will be different to the input current.
When you start lowering the voltage the current demands will proportionately increase in accordance with Ohms Law.

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Expert Comment

by:TheTull
ID: 35169191
I suggest going with an APC PDU that has the specific adapter you need to plug into your UPS, yet has the standard outlets you need for your servers.  They have several options available.  I have done this in the past with several similar UPS devices.  APC's website has nice end-user tools to help you decide what device to buy.
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Author Comment

by:TrialWorks
ID: 35169312
J33p3, some of the bigger UPSs have step-down parts, but of course I don't see one for the Dells I had in mind.

TheTull,  if I am reading your right, you think I should scrap the Dell bit and go with APC because it's easier to find what I need?

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Expert Comment

by:WhitePhantom
ID: 35169558
I agree with TheTull.  It's better to get something that can output the voltage you need.  It may also be good to avoid voltage conversion in case it makes the power dirty.

I love my Tripp Lite unit, but it may be bigger than what you're looking for.  They probably have smaller options
http://www.tripplite.com/en/products/model.cfm?txtModelID=3812

They also have a nice PDU selector:
http://www.tripplite.com/en/products/selectors/pdu/index.cfm

WP
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Expert Comment

by:TheTull
ID: 35170024
I don't think you have to scrap the Dell UPS, you just need a PDU with an input cord (the power cord for the PDU) that matches the interface on your UPS.  What type of outlets are on the UPS for output power?  Are they all L5-20, L5-30 for example?  Many UPS devices, particularly the 3000 or 5000 VA variety come with a step-down conversion piece so that you have the outlets you need.  What is the model # of the Dell UPS?
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Expert Comment

by:aleghart
ID: 35185395
Why do you think that these servers only run on 110VAC?  I haven't seen an 110-only server in over a decade.

The PSUs are auto-switching 120/240VAC.  All you need is the proper cord sets.

PowerEdge 2970 Rack Server
Power
Standard 750 Watt hot-plug power supply
Optional redundant 750 Watt hot-plug power supply
Auto-switching universal 110/220 Volts


Get one of these for 208V (NEMA L6-20P).  They have IEC 320 C13 ouputs.

Just connect those with IEC to IEC cords.  You might have some stuffed in a drawer labeled "server extension cord".
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Accepted Solution

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TrialWorks earned 0 total points
ID: 35202912
Aleghart, I don't think they will only run on 110V... I don't plan to swap them to 240V.   We have other equipment in the server room that cannot be transitioned.  My requirements are to maintain 110V in the server room.

Either way, the solution was pretty simple: a step down transformer.  The one that would easily get the job done is http://www.provantage.com/eaton-eppdmg6000-3u-1~7EPW931E.htm

That's what I was looking for.
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Author Closing Comment

by:TrialWorks
ID: 35230132
I was looking for a part number to solve my issue, and ultimately found one myself
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