OK, thanks for the advice
so below is where i stand on the wiring and that makes sence...

Nvem S-Axis out1 Orange and White twisted pr goes to STF on the VFD
Nvem S-Axis out2 Green and White twisted pr goes to STR on the VFD
The other two twisted pairs blue and white,brown and white have not been connected as yet but looks like terminal 5 and 2 after reading your reply

S-axis /Gnd1 goes to terminal 5 on Vfd which is Analog Gdn
S-axis/VSO goes to terminal 2 on VFD which is 0-10V.

just a bit confused on the last part...

Doddy
Jazz is correct - you're having to short the analogue and digital ground together for the VFD. I did do this on mine, also a NVEM, and it worked, though I did get some fluctuation in final spindle speed that may or may not have been associated with this and a ground loop. I never did find out what because I replaced the analogue speed control with a £2 RS485 serial link to the VFD.
just a bit more info on what i need to do here.