On Thu, Mar 2, 2023 at 10:42 PM Tim via users
<users@xxxxxxxxxxxxxxxxxxxxxxx> wrote:
>
> On Thu, 2023-03-02 at 17:09 -0600, Chris Adams wrote:
> > Lots of the time, UPSes and generators are not actively monitored and
> > tested. An untested backup system is not a backup system, it's just
> > another point of failure! I have seen failures of big UPSes,
> > generators, transfer switches... you name it, even if it is "redundant",
> > it can (and will) still fail.
>
> I have a UPS sitting next to me, right now, in pieces, which (half)
> died in a most peculiar manner:
>
> A burning smell was eventually traced to it. There's no visible signs
> of burning, and no schematic available for the model, that I can find.
> A rather acrid smell, not one I'm used to with component failure, I'm
> beginning to suspect a large AC transformer.
>
Did you check the impedance of the transformer?
> While running off the mains its output is a (too) low voltage, but
> still high enough for most switch-mode power supplies to run normally
> (i.e. the computer and monitor). It has some kind of AC voltage
> regulation built into it to deal with under and over-voltage. The
> AC supply was normal, at the time.
>
> But running off its battery it produces the full 240 volts it's
> supposed to.
>
> --
>
> uname -rsvp
> Linux 3.10.0-1160.83.1.el7.x86_64 #1 SMP Wed Jan 25 16:41:43 UTC 2023 x86_64
>
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