What method are you thinking of using for controlling the spindle speed and direction?
If you have a KDMD that is complete with enclosure and direction switch, you will need to reproduce the reversing switch set up with a reversing relay and ensure the I1 & I2 contacts are used as it is in the present system.
To run remote analogue input you require an isolated controller as the KDMD is at line potential and not isolated.
Al.
CNC, Mechatronics Integration and Custom Machine Design
“Logic will get you from A to B. Imagination will take you everywhere.”
Albert E.