Some UPS don't care for an unregulated AC. Either run your current generator through a line conditioner or go with inverter generators. The latter would be my choice and is what I use. Way back in the day I had cisco t1 routers that would not run on a 6kw portable generator. I had to use my truck inverter to power the site.
On Mon, Sep 21, 2020, 10:49 Adam Moffett <dmmoff...@gmail.com> wrote: > Ken's answer of "use an inverter generator" is probably the simplest > thing. You'll have way fewer problems than with any other portable > generator. Also "dramatically oversize the generator" would be a good > solution too. > > Half the windings on the generator give you a 110v phase. The other half > give you the other 110v phase. Both together gives you the 220v. > > Are both UPS's about 5-6 amps, or is one much heavier loaded than the > other? Are they both on the same phase or are they on opposite phases? A > wiring diagram for the Troy-Bilt 6250 shows two separate circuit breakers > feeding two separate duplexes, so you'd want to distribute load across them > both. > > If one phase has more load than the other, then there's more resistance on > one side of the stator. That'll make the engine run rough and that'll make > the frequency unstable. Lights and power tools won't care, but UPS's will. > If that was the issue, then the engine would run better with a 220v UPS. > If the imbalance is real bad you can even stall the engine. A bigger engine > won't care so much, and an inverter generator doesn't have this issue at > all. At one time when the server room had to run on a 6KW generator I had > lots of problems until I carefully balanced the loads....so there's my > anecdotal/experimental evidence. > > There might also be a sensitivity setting on the UPS. I'm not sure about > that specific model, but on some of them you can get into the management > software and change them to be less sensitive about the AC input. > > -Adam > > > > > On 9/21/2020 10:22 AM, Josh Luthman wrote: > > 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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