Re: IBM rack ups issues

Well you are correct they do expect, and MOST equipment can handle both 110v and 220v input with no changes, some older stuff has a slide switch for 110 or 220. Odd that you would have a lot of stuff, especially in the DC, that doesn't do 220. Clearly someone didn't do their homework. :-(

BUT you do so you have choices.

a) Replace it (Yes that was a tad obvious. :-) )
b) Find an alternative power source for that equipment. Unfortunately this may mean an additional UPS.
c) Replace the UPS with one that has both 110V and 220V output. These are actually quite common.
d) Get one of the units that down-converts the 220V to 110V. These things are generally not cheap as they maintain the balance of power draw across the two legs of the UPSs 220v circuit. With standard 'wall power' you simply use one leg of the circuit and shazaam you have 110v. On 'wall power' this is normal everyday setup. However the 'balance point' there is the nearest upstream transformer and it's likely good for A LOT of power. It won't be upset by higher draw on one leg or the other. A smaller UPS however would be upset when one leg is drawing 20 Amps and the other 10 Amps. Depending on the unit it may actually have to 'burn' the 10 Amps on the low side just to stay in balance and that kills battery life. I have even seen some just shut down. (Though those were older units).

- Larry "DrFranken" Bolhuis

On 2/19/2011 5:30 PM, Jim Franz wrote:

so how does one deal with rack equipment that must have 120 power only and a
UPS that outputs 208/240 (and not spend big $$$)?
I've searched several pdu sellers, APC, TrippLite,& others and find they
expect your equipment to handle both(. The 9910 E65 has C13& C19
receptacles so need a pdu with C14 or C20 to plug in,.
jim

----- Original Message -----
From: "DrFranken"<midrange@xxxxxxxxxxxx>
To: "Midrange Systems Technical Discussion"<midrange-l@xxxxxxxxxxxx>
Sent: Saturday, February 19, 2011 3:09 PM
Subject: Re: IBM rack ups issues

Unlikely the 720 is damaged as it auto-switches from 100 to 200v ranges.
That's one of the benefits of 'international power supplies' - they can
deal with about anything from round about 90 V up to 250 V or so with no
harm no foul.

This is however one down site to the rack mounted PDUs that have nothing
but the C13 outlets. They are valid for both 110V and 220V but just
lookin at 'em it's hard to say what's coming out! A DMM is your friend!!!

- DrFranken

On 2/19/2011 11:39 AM, Jim Franz wrote:

They have backed down to the old UPS, will have to fix or replace various
components, and don't know yet if they damaged the Power 720.
jim
----- Original Message -----
From: "Jeff Crosby"<jlcrosby@xxxxxxxxxxxxxxxx>
To: "Midrange Systems Technical Discussion"<midrange-l@xxxxxxxxxxxx>
Sent: Saturday, February 19, 2011 10:59 AM
Subject: Re: IBM rack ups issues

110v vs 220v?

All the plugs in our rack look like 110 but they're 220. Don't ask me
how
I
know that.

--
Jeff
Sent from my mobile. Please excuse the brevity, punctuation, and
spelling.

On Feb 19, 2011 10:37 AM, "Jim Franz"<franz400@xxxxxxxxxxxx> wrote:

Have a customer switching their standalone ups to a IBM (Eaton) rack
ups-same kVa, and when they plugged in a power cable from phone closet
that
had internet router it blew the power supply in the router. 2 other
older
pc's blew power supplies.
But the i and rest of servers/switches came up fine. I'm remote& can't
see
what's going on. Any ideas i can point them to? I've recommended they
call
svc on the UPS.
Jim Franz
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