Re: brown-out
From: w_tom (w_tom1_at_hotmail.com)
Date: 11/22/05
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Date: Mon, 21 Nov 2005 21:39:39 -0500
We've been through this before. Leythos claims appliances
on UPS were not damaged. That was proof sufficient of UPS
protecting appliances? Leythos again ignores something even
more interesting. He also suffered no damage to smoke
detectors, GFCIs in bathroom and kitchen, dimmer switches, and
furnace controls. They had even better protection? They had
an "Invisible UPS" protector. Since they also were not
damaged, then a UPS must have provided them with protection.
Since nobody could not see it, then Leythos must also have
"Invisible UPS" protectors. He forgot to mention those
protectors.
Ahh, but we are only repeating what was posted in that
other newsgroup. Leythos again forgets to mention his other
household appliances that have "Invisible UPS" protectors.
Reality: damage only occurs to selected appliances based
upon incoming and outgoing electrical paths during a direct
lightning strike. Remove those UPSes and appliances still
have same protection.
Somehow Leythos knows those appliances would have been
damaged without the UPS. Would have been damaged just like
the smoke detectors, GFCIs, dimmer switches, and furnace
controls that have "Invisible UPS" protection. A
contradiction he could not explain then and he forgets to
mention now.
Plug-in UPSes don't even claim to provide protection that
Leythos somehow knows must exist. But then, "Invisible UPS"
protectors also make no such claims. They must have
"Invisible Specifications" and still protected smoke
detectors, GFCIs, dimmer switches, and furnace controls.
After all, Leythos tells us that without a UPS, those
electronic appliances will be damaged? Or is his logic
flawed ....
Meanwhile, brownouts do not damage electronics. Power
supply must provide all power at correct voltages (3.3, 5, and
12 volts), or completely shutdown. A standard for power
supplies even 30 years ago as is required by Intel specs
today. Brownouts do not damage computer hardware.
Incandescent bulbs can glow at less than 40% intensity due to
a brownout - and the ATX computer must still work just fine.
This from numbers in the Intel ATX specifications. Yes, to
crash a computer, a brownout voltage must drop so low that
incandescent bulbs are less than 40% intensity. Computers
must work just fine even when line voltage drops that low.
Just another part of computer protection provided by its power
supply. A fact that some may forget when claiming brownouts
as destructive.
If brownout voltage drops below that spec level, then
computer system shuts down. Another function provided by the
power supply and a gray signal wire called Power Good or Power
OK.
Notice the claim is made AND supporting facts are provided.
If only someone would do same when claiming a UPS provides
protection. Still waiting for those UPS manufacturer's
numerical specs for the SU220 - that apparently don't exist.
If Lyethos claims the UPS provided protection, then how does
he expalin all those other devices without UPS protection that
were not damaged? UPS protection from typically destructive
transients are not claimed by plug-in UPS manufacturers.
Leythos wrote:
> Fortunately I know the difference between the two types of devices as
> I've used them both for decades.
>
> I also know that the SU2200 series UPS will protect my servers
> (devices connected to the protected side of it) from surges as well
> as brown-outs.
>
> Maybe you don't use the same definition of "Brown-out" as the rest of
> us - I see a brown-out as something less than the required minimum
> voltage necessary for proper operation of the device, but more than
> 0v.
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