You really need to find out what the spindle drive is. Mine was a SCR style drive (very common for DC motors), which means the speed control terminals are at near mains voltage. Connect them to anything other than an isolated 0-10V, and something will be releasing magic smoke.
Dam, I have no idea what drive it is. The machine is from 1986 and has the Lander control board. it does look like the input is 240v and there is a transformer before the motor.