In article , Gunner Asch says...

... so micky
moused up a 1/2hp 110vt 3450 moter, pulley and flat belt to spin the
big motors shaft directly, before applying single phase power to it.

That's a terrible idea, it'll never work. :^)

Anyways...plugging the Airco mig into the impromptu RPC. I found the
motor itself was idaling at about 18 amps on each input leg, and the
output legs generate 240, 2399, and 233 volts across the output legs,
with the manufactured leg provideing 233 volts.

Hmm. Not sure about the 2.3 kV leg there....

With the Airco turned on, simply ideling, current went up to about 22
amps per leg, and here is the funny part...at 25 volts, burning .45
DualSheild, with 150 amps indicated on the welder, total current draw
only went up to 28 amps, raising the voltage to its top 35 volts...far
far into the OH **** spray transfer mode, only raised the total amps
to 35 with an indicated 250 amps of weld current.

One thing you have to realize is that the amperage you are measuring
on the legs (probably via an amp-clamp meter, right?) is mostly
reactive power when you are not loading the idler. When you load it
by welding, the power factor is coming closer to one, which means
it's spinning your meter more. The idea is that the amp clamp does
a poor job of showing the real power draw, because the unloaded
condition has such a low power factor.

The good news is, the 18 amps you measure with it unloaded is mostly
reactive current. You are probably drawing something like 500 watts
total when it's not loaded, if my stone age converter is a guide.

Jim


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