Mill Retrofit with Fanuc DC Drives

What is the best way to verify the ground? Measure the resistance from the machine frame to the drive frame and mesa boards frame?

The machine was originally setup with a virtual tach using a f/v converter inside the Fanuc controller. Here is a diagram of the original setup. 


Thank you again for the help!

Do you have a document for the actual driver pinout?

 

Yes. I am connecting to the two honda connectors labeled J10 and J5 on this diagram. 

Please let me know if you see any mistakes in this. 
Machine side       ->      Mesa 7i83
Pin 1, PRDY1X    ->      TB2, Pin 1, ENA0-
Pin 2, ENBL1X     ->      TB2, Pin 1, ENA0-
Pin 3, OVL1X       ->      No Connection Currently
Pin 4, VRDY1X    ->      No Connection Currently
Pin 6, TSAX         ->      TB2, Pin 16, AOUT3
Pin 7, VCMDX     ->      TB2, Pin 4, AOUT0
Pin 13, 0G           ->      No Connection Currently 
Pin 14, PRDY2X  ->      TB2, Pin 2, ENA0+
Pin 15, ENBL2X  ->      TB2, Pin 2, ENA0+
Pin 16, OVL2X    ->      No Connection Currently
Pin 17, VRDY2X ->      No Connection Currently
Pin 19, TSAX      ->      TB2, Pin 15, AGND
Pin 20, ECX        ->      TB2, Pin 3, AGND


Machine side       ->      Mesa 7i85
Pin 1, 0V         ->      TB3, Pin 3, GND
Pin 2, 0V         ->      TB3, Pin 3, GND
Pin 3, 0V         ->      TB3, Pin 3, GND
Pin 4, +5V       ->      TB3, Pin 6, +5V
Pin 5, +5V       ->      TB3, Pin 6, +5V
Pin 6, +5V       ->      TB3, Pin 6, +5V
Pin 8, OH1X    ->      No Connection Currently 
Pin 9, OH2X    ->      No Connection Currently
Pin 14, PCZX   ->      TB3, Pin 7, IDX0
Pin 15, *PCZX  ->      TB3, Pin 8, /IDX0
Pin 16, PCAX   ->      TB3, Pin 1, QA0
Pin 17, *PCAX  ->      TB3, Pin 2, /QA0
Pin 18, PCBX   ->      TB3, Pin 4, QB0
Pin 19, *PCBX  ->      TB3, Pin 5, /QB0