The odds are very good that a G320X will drive these
motors well. If possible check to see what the power
supply voltage and current capability of the original
machine were. Voltages in the range of 18 VDC to 80 VDC
are acceptable with the G320X.
The motor wiring is typically easy to figure out. Likely
there are two heavy wires supplying current to the
actual motor brushes, and maybe a ground in the
There seem to be 3 cables on each assembly. One is
of course the motor current. A second will be the
encoder. The third may be a tachometer, or less
likely, a brake. Tachometer wiring will be relatively
small and should have a shield. Brake wiring would
likely be heavier and not need a shield.
The encoders look to have end caps that are easily
removed. If so, you might try looking inside to see
if you can easily identify an electrolytic filter capacitor
anywhere. This can lead to a way to identify the
ground connection from its negative side to one of
the pins of the connector. One hopes for meaningful
color codes like black=GND and red=V+ but there
are no guarantees. The positive side of the capacitor
is likely to be +5 VDC. The remaining signals from the
encoder should be the phase and index outputs. You
may have single ended or differential outputs. If you
have differential outputs, you can usually just use
one side of each differential pair to feed the encoder
inputs of a G320X, but a differential receiver adapter
can provide extra noise immunity. The index signal is
not used by the G320X.
If you have a tachometer output, it will not be used
with the G320X.