*BSD News Article 37547


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From: lpedlow@csn.net (Lee Pedlow)
Newsgroups: comp.os.linux.development,comp.os.linux.misc,comp.os.386bsd.questions,comp.os.386bsd.misc,sci.electronics
Subject: Re: APC SmartUPS series serial-port protocol anyone?
Date: 5 Nov 1994 05:22:26 GMT
Organization: Colorado SuperNet, Inc.
Lines: 50
Message-ID: <39f4qi$42h@burgundy.csn.net>
References: <CMETZ.94Oct30051603@itchy.inner.net> <SRA.94Oct30162124@rurha-pente.epilogue.com> <CMETZ.94Oct30192816@itchy.inner.net> <1994Nov3.012516.8955@csustan.csustan.edu> <rgarito.783901485@thunder> <39dkjf$2jt@darykon.darykon.wa.com>
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Gerry Simmons Jr. (simmons@darykon.wa.com) wrote:
: Since we're talking about Best Power UPS's, I Just got one from a friend of mine a few weeks
: ago. It's the 350VA version, a little old, but what the hell. I didn't have a manual for it,
: called their technical support, and they shipped me out a manual in 3 days (for what I understand
: is an almost 5-year old product.) My question to you Best UPS owners is this:

: 	My machine is a 486/66 VLB with 32MB RAM
: 	2 WD Hard Drives 450MB and 540MB
: 	Orchid 1280 VLB Video Board
: 	Sound Blaster 16
: 	NEC CD-ROM
: 	Adaptec SCSI controller
: 	Archive 150MB Tape Drive

: 		and

: 	NEC 4FG Monitor

: I calculted the power drawn by the above. The Computer itself draws worst case 150W. The NEC is
: rated at 105W. Now I understand W and VA aren't the same and the 150W, I tried to put a 85%
: efficiency factor in (switching supply.) My problem is this: When I have my monitor turned off
: for more than an hour, when I turn it on, it resets my system. Just turning the monitor on and
: off doesn't do this. Any Ideas?

: ---
: Gerry Simmons
: simmons@darykon.wa.com

--
Gerry:

There is a degaussing coil built into the monitor that is activated when
power is applied to the monitor. That coil draws a large surge of current
for a short period when you first turn on a COLD monitor. (That's the buzz
you hear when turning on a cold monitor). There is a thermistor that
limits the current and cuts the circuit off when it heats up, hence no
surge on a warm monitor. Once it cools off again, another surge at
turn-on. This is probably the reason you're having power problems when the
monitor is cold. I'd reccommend that you get the monitor off the UPS
anyway, as that's a waste of back-up capacity and is not "mission critical".

Lee Pedlow
Staff Engineer
Product Development Group                          Did It, Been There! ;-)
SONY MSD					   li-zo, Itta!
Boulder, CO

email:					  			      AppleLink:
pedlowl@ccmail.sgo.sony.com	cc:Mail - Lee Pedlow, SEL-BOULDER     DSLBLD
lpedlow@dsl.sema.com