Jazz thats a great idea, will look into it, thanks.
Just a query about the wiring. I have heard you need to wire the emergency stops to stop the ac circuit and you cant wire them in with limit switches because motors will produce power and possibly fry motor drives? Is this true?
Also ive heard a lot about a 'ground star point' or similar. Can someone take me through this, never really understood it. What grounds go back to it?

Thanks all again