On Aug 11, 2006, at 1:18 PM, Ben Scott wrote:
I often wonder why the IT industry doesn't come up with something
along those lines. While redundant-everything is more then most
people want, the flow of power is much more appropriate. With a
conventional setup, we convert from AC to DC to AC to
Ben Scott writes:
> I suspect this type of device is perfect for situations where line
> voltage is consistently out of tolerance by a certain amount.
> However, they do not provide isolation from line transients or noise,
> nor can they cope with severe undervoltages (< 95 VAC or so). We have
>
On Aug 10, 2006, at 6:11 PM, Ben Scott wrote:
The nature of these voltage regulators also means the regulation is
somewhat approximate -- there are typically only three or four taps,
and it takes time to switch taps. I'm not sure how much that really
matters, but given that some of this test e
Out wonderful telcom system was designed by the department of redundacy
department.
Ben Scott wrote:
On 8/10/06, hewitt_tech <[EMAIL PROTECTED]> wrote:
This discussion reminds me of a Murphy's Law corollary - "An expensive
transistor being protected by a fast acting fuse will protect the
Ben Scott wrote:
I often wonder why the IT industry doesn't come up with something
along those lines. While redundant-everything is more then most
people want, the flow of power is much more appropriate. With a
conventional setup, we convert from AC to DC to AC to DC, as we go
from line to UP
On 8/10/06, hewitt_tech <[EMAIL PROTECTED]> wrote:
This discussion reminds me of a Murphy's Law corollary - "An expensive
transistor being protected by a fast acting fuse will protect the fuse by
blowing first!".
Heh. I've heard a variation on that before -- appropriately enough:
"A $1000 UPS
On 8/10/06, Matt Brodeur <[EMAIL PROTECTED]> wrote:
APC doesn't make anything that fits the above requirements. Ditto
PowerWare (formerly Best Power). Double conversion units may be
available, but they're larger then desired for this application.
Is the Powerware 9125[1] not what you're look
Ben Scott wrote:
> On 8/10/06, Mark E. Mallett <[EMAIL PROTECTED]> wrote:
...
>> (or you could get one of those flywheel systems..)
>
> Ha ha, only serious. I looked -- very briefly. Motor-generator
> sets are the best power protection money can buy, or so I'm told.
> It's hard for a voltag
On 8/10/06, Mark E. Mallett <[EMAIL PROTECTED]> wrote:
http://www.intellipower.com/
Yah, Google found them, too. They had some interesting tech papers.
The issue, as usual, is that it's all biased to sell their stuff.
:-/
While they all lasted 5+ years, most of them long enough to go thro
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On Wed, Aug 09, 2006 at 10:56:37PM -0400, Ben Scott wrote:
> APC doesn't make anything that fits the above requirements. Ditto
> PowerWare (formerly Best Power). Double conversion units may be
> available, but they're larger then desired for this a
On 8/10/06, Mike Medai <[EMAIL PROTECTED]> wrote:
Tripp Lite also makes these:
http://www.tripplite.com/products/conditioners/index.cfm
We actually have some units very like that in use now. They're APC,
but same idea. What these particular devices do is provide a
multi-tap transformer which
I used to, for some reason, insist on using online UPS rather than
standby; this led me to Intellipower:
http://www.intellipower.com/
I dunno if I ought to mention them though. We bought a number of rounds
of them over a few years (from, say, 1991 through 1997). The ones we
bought worked pre
[EMAIL PROTECTED] wrote:
You definitely take an efficiency hit. However, in this case
(extremely dirty power and extremely expensive and sensitive
equipment), I believe we don't have much choice. We need something
that can handle frequent severe sags as well as all sorts of
distortions. A sta
On 8/10/06, Bill McGonigle <[EMAIL PROTECTED]> wrote:
There was some discussion here maybe a year ago about similar things.
Try 'inverter, whole-house, room, circuit' - those kinds of things were
discussed. Someone had some brand recommendations.
You mean this thread?
http://article.gmane.or
There was some discussion here maybe a year ago about similar things.
Try 'inverter, whole-house, room, circuit' - those kinds of things were
discussed. Someone had some brand recommendations.
I seem to remember someone saying the efficiency of the always-inverting
type was very poor, increa
On Wednesday 09 August 2006 10:56 pm, Ben Scott wrote:
> Hello world!
>
> I'm looking for opinions on UPSes. I've long been buying APC
> Smart-UPS units, and while I've generally been happy with them for
> what they are, I'm encountering some situations where something else
> may be needed. Spe
Ben Scott wrote:
One thing I went looking for was on-line, double conversion units.
These are units which are always running on the inverter, AC->DC->AC.
In theory, this yields very effective protection. There's no direct
connection to the main supply, so transients (spikes, surges, sags,
etc.)
On 8/9/06, Bruce Dawson <[EMAIL PROTECTED]> wrote:
Beware! Not all inverters are the same - a lot are acoustically noisy
(e.g. constant buzzing).
As long as the electrical performance is up-to-par, I don't really
care if it makes noise. That 100 HP electric motor I mentioned isn't
exactly qui
Ben Scott wrote:
> Hello world!
...
> http://www.minutemanups.com/products/cpe.php
>
> Anyone here have any thoughts, opinions, etc., on this subject?
Beware! Not all inverters are the same - a lot are acoustically noisy
(e.g. constant buzzing).
You may want to consider building your own with a
Hello world!
I'm looking for opinions on UPSes. I've long been buying APC
Smart-UPS units, and while I've generally been happy with them for
what they are, I'm encountering some situations where something else
may be needed. Specially, high-value, sensitive computer and test
equipment in a fac
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