I just bought a robot controller

The controller I got with my P-50 Process (welding) robot says it wants
40 amps of 440v 3 phase (ok, it isn't 440v, but I think you know what I
mean).
So when I saw a robot controller sitting outside of Penn State Surplus and
Salvage
with a 110 cord hanging out the back, and better yet, 110v written on the
back,
I bought it. Then I picked it up. Recommend the reverse order, try to pick
up
first, then buy.

The nice thing about it is that once you take the cover off, it was two
pieces,
an outdated computer and six never go out of date H-bridges. The bad thing
is
that it is H-bridges, not a chopper amp, and the chopper part is up in the
controller.
It has a monster unregulated supply. The H-bridges have 5 inputs, A,B,C,D
and EN.
I assume A,B,C,and D are the legs of the H-bridge, and EN is Japanese for
Enable.

I have 2 questions:
1 -- does it make sense to have all 4 transistors independently driven?
2 -- is it likely that if I turn it on to check the power supply that I will
smoke a H-bridge? There is a bleeder resistor across the main filter
cap, so that part is relatively safe.

Regards,
Eric "the robots can't hear you scream" Keller,
or maybe it's Eric "Joe Vicars is selling my Bridgeport on Ebay piece by
piece
and there ain't nothing I can do about it" Keller