Hi there,
I'm not an expert on this subject, but i know a few things... i am trying to control my vfd directly on it's terminals (relay and vi speed variation)
In your case you have to configure the vfd settings pd001 and pd002 must be set to 2
Also the little jumper near the vfd terminals (right side of terminals) must be set on VI instead of VR
Another thing you must configure is baud rate on vfd settings... i don't know the pd number see owners's manual...
Then the pc should "talk" to vfd...
Hope this helps you
In my case it took me 3 days to diagnose the problem... the wiring was good, mach 3 settings good, but when instart the spindle it starts then it stops right away and mach3 says "limit switch triggered"
I think its related to the 5v rail... very strange anyway...