It wasn't, during normal outage the switchover was perfectly good, but during self test there was additional garbage being generated for a brief moment, as if it was cutting in and out additional filtering stages for some unknown reason, this behavior was knocking out power supplies and computers were shutting down. I've made a long thread on APC forums about this issue but they have taken the forums down since. They deemed the UPS faulty as well. It started misbehaving few years into commission. Noticed equipment reset not during power outages but when it was doing the impossible to disable self tests.
LOL ok there is "simulated sine wave"... and then there is "inverter so cheap it is a 3 state plus/minus/zero without any filtering". Sadly this is what the UPS companies get away with in a non-professional/consumer market.
Some kind of LC resonation when UPS or PC PSU is adjusting to correct the power factor by active PFC? Problem may be caused by different ups operation in self test mode where mains is also available.
Something like that, it was cutting in and out some filtering stages during self tests but not during outages, over the years it's gotten worse and worse resulting in equipment dropping offline during the self tests, it has been replaced with true sine wave model since.
I am a physicist with experience using these things both at home for a PC and in a lab to power expensive/sensitive electronics. I understand the direction of your thinking but I think you are (sadly) giving WAY too much credit to APC (and most companies that try and make them for
It wasn't, during normal outage the switchover was perfectly good, but during self test there was additional garbage being generated for a brief moment, as if it was cutting in and out additional filtering stages for some unknown reason, this behavior was knocking out power supplies and computers were shutting down. I've made a long thread on APC forums about this issue but they have taken the forums down since. They deemed the UPS faulty as well. It started misbehaving few years into commission. Noticed equipment reset not during power outages but when it was doing the impossible to disable self tests.
It is written in manual/specification "Stepped approximation to a sinewave". But yes, this su(ks.
What is the issue? It's supposed to output "approximated sine wave", so that's what we see when running off the battery.
It wasn't, during normal outage the switchover was perfectly good, but during self test there was additional garbage being generated for a brief moment, as if it was cutting in and out additional filtering stages for some unknown reason, this behavior was knocking out power supplies and computers were shutting down. I've made a long thread on APC forums about this issue but they have taken the forums down since. They deemed the UPS faulty as well. It started misbehaving few years into commission. Noticed equipment reset not during power outages but when it was doing the impossible to disable self tests.
LOL ok there is "simulated sine wave"... and then there is "inverter so cheap it is a 3 state plus/minus/zero without any filtering". Sadly this is what the UPS companies get away with in a non-professional/consumer market.
Sadly I don't have any clue about those things. But they are really interesting.
Some kind of LC resonation when UPS or PC PSU is adjusting to correct the power factor by active PFC? Problem may be caused by different ups operation in self test mode where mains is also available.
Something like that, it was cutting in and out some filtering stages during self tests but not during outages, over the years it's gotten worse and worse resulting in equipment dropping offline during the self tests, it has been replaced with true sine wave model since.
I am a physicist with experience using these things both at home for a PC and in a lab to power expensive/sensitive electronics. I understand the direction of your thinking but I think you are (sadly) giving WAY too much credit to APC (and most companies that try and make them for
Is this happening on all APC Smart UPS during self-test?
No, only the garbage consumer low end ones. Use true sine wave UPS only.
@@FrozenHaxor what's better than APC Smart UPS for a desktop computer? Actually I don't know.
@@LightsnRoses Product like APC SMT750IC would serve you well, it's data center rated and has true sine wave output.
What kind of loads are you trying to run. Newer PC PSU's may have PFC which couldscrewe up the UPS.
Normal.
It wasn't, during normal outage the switchover was perfectly good, but during self test there was additional garbage being generated for a brief moment, as if it was cutting in and out additional filtering stages for some unknown reason, this behavior was knocking out power supplies and computers were shutting down. I've made a long thread on APC forums about this issue but they have taken the forums down since. They deemed the UPS faulty as well. It started misbehaving few years into commission. Noticed equipment reset not during power outages but when it was doing the impossible to disable self tests.