[Nut-upsuser] POWERCOM UPS USB : UPS Shutdown

[Jim Klimov]

Well, it is always (quite) possible that the hardware is... subpar, leading
to loss of connection.

Try a different USB port (maybe on a different MoBo hub if there's a
choice), different cable (check if you have a shielded/grounded one to
minimize EMI noise), revise if there are any motors (fridges, dishwashers)
or luminescent lighting starters etc. nearby on the electric line and
physically near the cabling, etc.

Maybe there is some vendor-provided way to update the UPS firmware?

You mentioned the device may be from 2017 - maybe it collected a lot of
dust over time and just overheats or has random static discharge inside -
so some internal physical maintenance with a toothbrush, vacuum cleaner,
and proper electrotechnical hygiene for your safety could also do wonders?
On similar note, is the battery also as old? PbAc tend to not live that
long, maybe replacing it could stabilize things.

Jim


On Fri, May 16, 2025 at 9:41 AM Alexey Korobeinikov <alexey at fseafood.com>
wrote:

> On Devuan Linux daedalus (no systemd).
> I try to manualy start nut-service or just usbhid-ups drivers. I have
> observed such problems before. They were solved by usbreset on this
> device (0d9f:0004) and immediately launch nut-service/drivers. But
> sometimes it wasn't necessary to do that.
>
>
> 16.05.2025 00:01, Jim Klimov:
>
> Are you on Linux? Did you check if NDE created a service instance like
> `nut-driver at UPS` that starts automatically and your manually started
> driver instance tries to steal from it?
>
> *
> https://github.com/networkupstools/nut/wiki/nut%E2%80%90driver%E2%80%90enumerator-(NDE)
>
> Jim
>
>
> --
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