I observed this behavior with several Powercom UPSs (BNT 400/600/1000)
new and old on different computers. It didn't matter. Even replacing USB
cables or switching to another port didn't give stable results. Only
usbreset and immediately restarting/starting the service gave about 90%
result. Therefore, I slightly changed the startup script in the system
so that if the required VendorID:DeviceID was available, this port would
be restarted and NUT would be started immediately.
16.05.2025 11:16, 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
<[email protected]> 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) andimmediately launchnut-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@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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--
З Повагою
Коробейніков Олексій
Системний адміністратор
ТОВ "Флагман Сіфуд"
вул. Броварська 152, смт Велика Димерка
Київська область, 07442
р.+38 044 495-88-00
вн.6101
м.+38 067 994-40-48
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