The drives you have are most likely obsolete Glentek or Westamp.
Modern drives use Torque or current mode of operation rather than velocity style of your old ones, this means that you can eliminate the use of the Tach feedback on your SEM motors, just take the tach brushes off. and leave un-connected.
Tuning the drives themselves is fairly simple, the gain pot is turned to max, the feedback pot to min.
You will still have to set the PID loop up in the controller though.
Do you have scales for feedback? or Encoders on the motors?
Al.
CNC, Mechatronics Integration and Custom Machine Design
“Logic will get you from A to B. Imagination will take you everywhere.”
Albert E.