Re: Calling all hardware gurus...

A tad over a year ago, I replaced the A/C and furnace at my house with
a heat pump and a new furnace. The heat pump uses the same wiring
from old thermostat to furnace, but does a lot more with it. The
interesting thing I found is that it reports the line voltage at the
heat pump. It is always reporting 207 - 208 volts. Not the
"expected" 220.

I am wondering if line voltage is ever actually 220, just like 120 is
usually a bit lower as well, like about 117.

John McKee


On Tue, Feb 14, 2012 at 12:42 PM, DrFranken <midrange@xxxxxxxxxxxx> wrote:

Youre 8204 is good for something around 90v up to something around
250v.  If you have dual power you can even run one PS on 110v and the
other on 220v and it simply will not care.  The PS will automatically
compensate by drawing more amperage to compensate for a lower voltage
and with lower amperage on a higher voltage input. Look up Georg Ohm and
his most famous law. :-)

Curiously I am installing a POWER7 770 at this moment with the left side
PDUs connected to a 208V UPS while the right side PDUs are connected to
a 240V UPS. The things you learn with monitored PDUs!

*WARNING* If you are running a larger system it may NOT run on the lower
voltages, that is those below about 200V.  Always RTFM if you are
unsure!! Each Power Supply comes with a limited quantity of
non-replaceable magic smoke. :-)

    - Larry "DrFranken" Bolhuis.

On 2/14/2012 1:08 PM, Tommy.Holden@xxxxxxxxxxxxxxxxxxxxx wrote:

That would be the man...



From:   "Jerry C. Adams"<midrange@xxxxxxxx>
To:     "'Midrange Systems Technical Discussion'"
<midrange-l@xxxxxxxxxxxx>,
Date:   02/14/2012 12:07 PM
Subject:        RE: Calling all hardware gurus...
Sent by:        midrange-l-bounces@xxxxxxxxxxxx

From Al?  No... .-)

Jerry C. Adams
IBM i Programmer/Analyst
The main idea is to win. -John McGraw
--
A&K Wholesale
Murfreesboro, TN
615-867-5070


-----Original Message-----
From: midrange-l-bounces@xxxxxxxxxxxx
[mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of
Tommy.Holden@xxxxxxxxxxxxxxxxxxxxx
Sent: Tuesday, February 14, 2012 11:50 AM
To: MIDRANGE-L@xxxxxxxxxxxx
Subject: Calling all hardware gurus...

The boss just asked me a question that I think I found the answer for but
would rather have someone confirm/deny my suspicions.  We have a Power 6
rack-mounted 8203-E4A 520 with 2 LPARs and the question was can we run
this
on 208v or does it need to be 220v.  According to the redbook
http://www.redbooks.ibm.com/redpapers/pdfs/redp4403.pdf it appears that
208v
would work but considering I'm electrically (and hardware) illiterate I
thought I'd ask those who are.  I would ask my BP but we've had some
"questionable" answers from them before...
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