Hello Given its age, I strongly suspect that your device is trying to tell you that you should replace at least some if not all the electrolytic capacitors
Regards, wolfy On September 20, 2023 9:40:20 PM GMT+03:00, "Marek Michałkiewicz" <[email protected]> wrote: >The UPS from 2004 still works fine otherwise (and I can monitor it with NUT >using the "bcmxcp" driver, see below). >BTW, still looking for a firmware update - SP54628.EXE is not available >anywhere, even though its SHA256 is known. >But, with or without load on the outputs, the UPS itself draws about 500 VAr >of capacitive reactive power from the mains. >Has anyone else seen this? Is this normal for these units, or just my unit >faulty in some way? >You can see it as input current (3.6A) larger than output current (2.7A), at >no load these readings are 2.2A and 0.0A. >But there is no high power loss, nothing is smoking etc. it's just a large >phase shift between voltage and current. >Reactive power is not charged here most of the time, but the utility company >reserves the right to do so if there is too much, especially capacitive >(inductive they seem to like better). >The allowed limits are tan(phi)=Q/P in the range from 0 to 0.4 where P is >active power in W (+ consumed, - produced) and Q is reactive power in VAr (+ >inductive, - capacitive). >Yes, the meter here is bi-directional (and remotely read by the utility) as I >have a small on-grid PV power plant here, to help reduce electricity bills. >Another older UPS (Liebert GXT2-3KRT230E) had higher power loss (lower >efficiency), but its power factor was purely resistive. > >$ upsc r3000xr@localhost […] _______________________________________________ Nut-upsuser mailing list [email protected] https://alioth-lists.debian.net/cgi-bin/mailman/listinfo/nut-upsuser
