Breakout board to Telemechanique Altivar 18 wiring (Mach3)

[Agathon]

I'm having some difficulty getting my head round how to connect my BOB to a nos Altivar 18 inverter. I can get the BOB to do the switching functions ie run, reverse etc, but I can't work out how to get it to control the speed. I think I have Mach3 correctly configured to the BOB, but I'm unsure how to connect for speed control.

Here's the BOB I have:


And this is the Altivar 18 wiring diagram:



I'm guessing that "0-10 Spindle Speed Output", labelled on the board as gnd and 10v, should connect to "com" and "AI2" but this doesn't work. What am I missing?