Hi, thanks a lot....that answers my question....I suspected it would be so for AC which is not handed like DC with + and -.

I'm downsizing my work place and this soon to be manual mill will take care of the odd jobs......I have a large Ajax turret mill but it's taking up too much room so eventually onto Gumtree and EBAY with it etc.

Thanks for all the tech help.....we should name you Mr VFD.....LOL.

BTW, in the event of a burn out with these VFD's......would they be repairable by a DIY person.....but I suppose it would be the same as a switch mode power supply.....all circuitry and no circuit diagram and no user friendly spare parts.....mostly, too cheap to bother with I expect.
Ian.