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From: gof@crash.CTS.COM (Jerry Fountain)
Newsgroups: comp.sys.ibm.pc
Subject: Re: HELP! Compaq Reboots while on UPS!
Message-ID: <1604@crash.CTS.COM>
Date: Tue, 25-Aug-87 00:12:21 EDT
Article-I.D.: crash.1604
Posted: Tue Aug 25 00:12:21 1987
Date-Received: Wed, 26-Aug-87 05:42:43 EDT
Reply-To: gof@crash.CTS.COM (Jerry Fountain)
Organization: Crash TS, El Cajon, CA
Lines: 31
Keywords: Compaq,Deskpro,UPS,Glitch

In article <3744@ecsvax.UUCP> cjl@ecsvax.UUCP (Charles Lord) writes:
>I have a curious problem that I wonder if anyone else has seen.
>I have an otherwise functioning Compaq Deskpro that will reboot
>sporatically (sp?) every few hours on its own if left on a 
>Tripp-Lite UPS.  It has done it so far with two separate UPS units
>that work great with IBM, Zenith, No-Name Taiwan, Wells-American,
>and other computers in the building, but the Deskpro will not run
>without rebooting every few hours while plugged into the UPS.
>
>Mind you, the power did not go off during that time as the UPS
>alarm never sounded!

One test I would recommend.  Pull the plug on the unit while it is
running.  If the compaq reboots (perhaps 1 out of three pulls) your UPS
response time is not good enough.  Many early IBM-XT's had a problem with
UPS's because the UPS would pull up the line *just* after the the machine
had reset.  The solution is to replace a capacitor on the power supply
with one of a larger value.

Also a recommendation for anyone using a UPS.  Pull the plug on it at least
once a month any deep cycle the gel-cell.  Otherwise they tend to die (and
of course at the wrong time :-).  By deep cycling them you will lengthen
their lives a bit (and assure yourself that they are still functional).




-- 
-----Jerry Fountain-----
UUCP: {hplabs!hp-sdd,sdcsvax,nosc}!crash!pnet01!gof   ARPA: crash!gof@nosc.mil
MAIL: 523 Glen Oaks Dr., Alpine, Calif. 92001         INET: gof@pnet01.CTS.COM