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
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