On 9/24/20 6:53 PM, Michael Barnes wrote:
You need to verify the wiring from your generator through the transfer
panel. Depending on how it is configured, it is possible the ground does
not make it all the way through when on generator. This can easily be
checked with one of those 3 light circuit testers. I have run into this in
the field using generators. In many generators, the ground and neutral are
not bonded. A UPS will see this as a fault and not accept the power.
For a building, a transfer panel may be wired a couple of different ways.
For a large "whole house" system, the transfer panel simply switches
between commercial power and a big generator prior to the main service
panel. In that case, the ground-neutral bond takes place in the service
panel and all should be good. In some cases, however, the generator is not
big enough for the whole house. In those situations, there will be a sub
panel for the "priority" circuits. The transfer switch then toggles between
the feed from the main service panel and the generator. Sometimes, the
transfer panel is wired incorrectly and does not provide the G-N bond when
on the generator.
Most modern generators are pretty well regulated, so the UPS rejecting due
to frequency or voltage is not likely. (Unless it is a cheapo Harbor
Freight or similar generator.)
Working a lot of field communications activity and back-up power for
critical sites, I have run into this quite often.
Check the wiring before worrying about power conditioners.
The transfer panel was installed by an electrician about 20 years ago.
The installation was done under a building permit, so I'm pretty sure
all the wiring is correct. And we never had this problem with our first
generator.
--
Regards,
Dick Steffens
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