big lathe, big motors may have both armature and field windings

Big Iron Veterans and Motor experts:

I have a 1980's vintage Jones & Lamson lathe
(12,000 lb class, 20/30 HP spindle, 3.5" spindle bore,
18" swing), in other words, "Heavy Metal". Actually,
I've got two of them, and this is the smaller one.

The current Allen Bradley controls may or may not
be ok, but that doesn't matter because it is being
retrofitted to PC control (besides, someone lost the
8" boot floppy!). I know that software for constant
surface speed cutting and threading isn't quite there
yet, but I'm sure we'll have it sooner or later.

The main spindle drive ("Reliance Electric SuperRPM DC Motor")
is labeled 3 phase 240V 72A, and also field winding
"STR SHUNT" 240V 3.18A, hot amps 2.50/.40
and there are four wires going into it: two thick cables,
and two (say 14 GA) wires.

I therefore assume the motor is a 2 wire armature,
2 wire field universal AD/DC reversable motor.
( What does the "hot amps 2.50/.40 " mean?).

There is a Reliance V*S SpindleDrive variable spindle
speed control unit about 14"square x 4" thick that
seems to convert the 480V AC into 240V DC, and it looks
Ok. I think I might be able to use it as-is if I can
figure out where the input speed control is (probably
a +/- 10 volt analog signal?) and maybe control that
manually with a pot, or through the PC with a D/A card.

Q#1
If anyone wants to give me an opinion on any aspect of
the above main spindle motor, please do.

-----------------------------
The two servo motors are a mystery: Kollmorgan Corp
Inland Motor Division Model TTR-4030-102-A
continuous 15V 20 Amps 10 lb*ft torque ie 1920oz*in
peak 67V 90 Amps 45 lb*ft torque ie 8640oz*in
max rpm 2000

Like the spindle motor, they have four wires too,
two thick, two thin, and I am presuming the two thin
wires are also for the field winding (control circuit).
But maybe they are merely for a brake, I don't know.

Atop the motors is a DC tachometer (18.9V/1000 rpm)
that seems to be separate from these other four wires.

Q#2
Does anyone have an opinion on these? If there were
only 2 wires, I'd be tempted to hook up gecko's
(80 V and 20 A) and let her rip. If the motors fry,
I'd have them rewound for 80V and 20A and try it again.

I guess I have to take one of the motors out and take
it to a specialist to see what they are (Inland doesn't
answer my email inquiries). But if someone here has a
good idea of what the two extra wires are (or has some
old documentation or specs), so much the better.

Any and all (on-topic) comments welcome.

Doug Fortune
http://www.cncKITS.com