Right! I’ve managed to crack it now……for all of you that need to get this working here’s what I did.
0-10 and ground went to 10v in and ground.
Because on the askpower VFD all connections are pre supplied with 12v all I needed to do was link forward and ground to get it to spin.
The trick that I was missing was PN07 set to 2 which allows for multi start signal. Then the other settings already discussed was PN03 to 4 (0-10) and PN04 to 2 external signal.
Thanks for all the help and I hope this finding also helps someone