I set mine to low when I install them due to that same post I've seen over the years.
Josh Luthman 24/7 Help Desk: 937-552-2340 Direct: 937-552-2343 1100 Wayne St Suite 1337 Troy, OH 45373 On Mon, Sep 21, 2020 at 11:00 AM Larry Smith <lesm...@ecsis.net> wrote: > We had to set the sensitivity (sp?) setting on all our APC > UPS to medium (drop from default of HIGH) or they would > not accept the generator current (would stay on battery). > > -- > Larry Smith > lesm...@ecsis.net > > On Mon September 21 2020 09:43, Ken Hohhof wrote: > > 110v at the generator or the other end of the 175 feet of 10 AWG wire? > > > > > > > > And total load is 5-6 amps each including the UPS charging the > batteries? > > What kind of UPS? Something like an APC will have a relatively low > > charging current, other setups may be quite a bit higher. I know our > Alpha > > UPS units have programmable charging current and I had to lower it in > case > > the only generator I have available is our smallest Honda 1000 VA, > > otherwise the generator would run for a minute or two and then trip on > > overload. > > > > > > > > Doing the math on voltage drop in the wire, 10 AWG is around 1 ohm per > 1000 > > feet, and you have 350 feet of wire including hot and neutral. So 0.35 > ohm > > times 5.5 amps is 2 volts. Assuming the generator is putting out 120 > > volts, that wouldn’t account for a 10 volt drop. > > > > > > > > Sounds like you suspect the generator can’t handle the load and as a > result > > is putting out low voltage. > > > > > > > > What kind of generator is this? Is it an inverter style? What is the VA > > rating? If it’s just a standard generator for power tools and stuff, a > UPS > > will sometimes find the voltage or frequency out of spec or unstable and > > refuse to run off it. If it’s just an APC UPS or something like that, > > sometimes they have a sensitivity setting that you can set lower. > > > > > > > > > > > > From: AF <af-boun...@af.afmug.com> On Behalf Of Josh Luthman > > Sent: Monday, September 21, 2020 9:22 AM > > To: AFMUG <af@af.afmug.com> > > Subject: [AFMUG] Generator power supply questions > > > > > > > > So Friday we have another 3 phase go down in the building. They > unplugged > > it all so that wing had nothing. > > > > > > > > As a precaution I start up the generator. When they're cutting the other > > phases we are using I move it to the generator. The generator complains > > and the UPS units don't switch over. I drop it to say 90% open choke and > > the UPS switches over - but it's only 110v. I'd like to know what's > going > > on here. > > > > > > > > I have 175 feet of 10 gauge (times 2). Two circuits on the generator, > two > > runs of copper, two UPS. UPS is doing about 5-6 amps each. > > > > > > What can I do better? Should I? It runs but I'd like to keep it as > simple > > as possible to avoid "teaching someone" to lower it from full open choke. > > > > > > > > Josh Luthman > > 24/7 Help Desk: 937-552-2340 > > Direct: 937-552-2343 > > 1100 Wayne St > > Suite 1337 > > Troy, OH 45373 > > -- > AF mailing list > AF@af.afmug.com > http://af.afmug.com/mailman/listinfo/af_af.afmug.com >
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