From: Price, Ed
Sent: Monday, June 02, 2003 8:19 AM
To: 'EMC-PSTC List'
Subject: Surge Suppressors on a UPS
Hi Group!
Last Friday, I got ambushed in a meeting. I hate it when that happens!
A question was asked about whether it's OK to put a surge suppressor on the
output of a UPS
David Heald hea...@symbol.com wrote on 06/02/2003 11:51:50 AM:
Most UPS's use a stepped approximation of a sine wave when in battery
mode. While most switching supplies don't care (and are the intended
loads for these UPS's), surge suppressors can cause real issues - It has
something
This is a multi-part message in MIME format.
So much for extension cords. I assume the UPS manufacturer claims his
product is unsuitable for use with all computer products containing surge
suppressors.
Bob Johnson
ITE Safety
Title: RE: Surge Suppressors on a UPS
So much for extension
Dear EMC-PSTC colleagues;
I mentioned off-list to Ed Price that almost all of the UPS from Tripplite
are in fact back up rather than uninterruptible; they perform a switch
from conditioned line power to inverter power in the event of an AC main
failure. This means that they may produce
Chris Maxwell wrote:
Fred,
Maybe you're right. Do UPSs protect against lightning surge?
Your question resolves into two issues: 1) Marketing Hype 2) Reality
1) I have seen some marketing hype that says their UPS will do everything to
protect your system and wash the windows while it is
Chris Maxwell wrote:
To me, this whole thread begs the question: Why not put the surge
supressor in front of the UPS?
A lot of us have relied on full-time UPS's to stop transients. But the bit
about a UPS itself producing large enough ones to trigger suppressors, that
is worrisome.
Fred,
Maybe you're right. Do UPSs protect against lightning surge? I know that
they protect against low frequency, low magnitude voltage dips and surges.
However, I'm unsure of their ability to protect against lightning surge.
If the UPS is specified by its manufacturer to protect against
all copies of the original
message.
From: David Heald [mailto:hea...@symbol.com]
Sent: Monday, June 02, 2003 11:52 AM
To: ed.pr...@cubic.com; emc-p...@majordomo.ieee.org
Subject: Re: Surge Suppressors on a UPS
Most UPS's use a stepped approximation of a sine wave when in battery
mode. While
I don't believe there are any power quality requirements imposed on
inverters except those specified by buyers (in the USA, anyway). You can
still buy square-wave inverters, after all, and the modified sine wave
could be called Chock Fulla Harmonic power. Harmful interference is a
limitation, but
I disagree. One assumes some degree of surge suppression since suppression is
touted as a UPS
feature. Therefore your question is moot.
Fred Townsend
Chris Maxwell wrote:
To me, this whole thread begs the question: Why not put the surge supressor
in front of the UPS?
Chris Maxwell |
To me, this whole thread begs the question: Why not put the surge supressor
in front of the UPS?
Chris Maxwell | Design Engineer - Optical Division
email chris.maxw...@nettest.com | dir +1 315 266 5128 | fax +1 315 797 8024
NetTest | 6 Rhoads Drive, Utica, NY 13502 | USA
web www.nettest.com |
Most UPS's use a stepped approximation of a sine wave when in battery
mode. While most switching supplies don't care (and are the intended
loads for these UPS's), surge suppressors can cause real issues - It has
something to do with capacitive overload of the output circuits.
And for the
I read in !emc-pstc that michael.sundst...@nokia.com wrote (in
57a26d272f67a743952f6b4371b8f81101e42...@daebe007.americas.nokia.com)
about 'Surge Suppressors on a UPS' on Mon, 2 Jun 2003:
I also don't understand the prohibition of an extension cord. Maybe
this is a legal issue, as I
, as this sounds like something I need to know!
Michael Sundstrom
NOKIA
TCC Dallas / EMC
of: (972) 374-1462
cell: (817) 917-5021
amateur call: KB5UKT
From: ext Price, Ed [mailto:ed.pr...@cubic.com]
Sent: Monday, June 02, 2003 10:19 AM
To: 'EMC-PSTC List'
Subject: Surge Suppressors
Hi Group!
Last Friday, I got ambushed in a meeting. I hate it when that happens!
A question was asked about whether it's OK to put a surge suppressor on the
output of a UPS that is supplying power to some expensive equipment. I opined
that I didn't think it should be necessary, but that it
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