On 14 Aug 99, at 18:56, Constant Brouerius van Nidek wrote:
> My desktop reboots at the moment with regular intervals.
> For the moment at two or three minutes intervals. Reason why I do not
> write this email on that machine. I had just time to look into my
> addressbook for the Survpc list before it rebooted again. Does somebody
> knows exacyly what causes this sh.... effect? (shutdown effect :-))
> Voltage approx. 190/195 Volt against 220/240 normal. I disconnected the
> UPS yesterday because that machine was acting strange. It beeped every
> five or so minutes and indicated that the electricity supply was down for
> seconds. The shutdown of my desktop occured than also but not that
> regular. The UPS only raised the voltage with about 10 volts unto 205.
> Television and a XT on the same power supply act normal (as far as I can
> see) Now I have connected the UPS again and with 205 volts there have been
> no shutdowns for some time even as the volt meter reads 195/196 volt. I
> believe that the low voltage shut down the power supply of the computer
> but thought that a UPS should help preventing such occurences.
Maybe what you need is a constant voltage transformer or
ferroresonant transformer ahead of your UPS to smooth things out.
One manufacturer of these devices is Sola Electric, now Sola/Hevi-
Duty. http:www.sola-hevi-duty.com These devices were in use
before the electronic UPS was practical. The output voltage stays
+ / - 3% of nominal for a +10%/-20% change in input voltage.
Mike
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