Quote Originally Posted by Paul53 View Post
none of you live in Hampshire by any chance?
Sorry no, I live in Exmouth. The one in Western Australia. I'm not sure my advice is worth a cup of tea anyway.

Earthing everything to a single point is supposed to prevent earth loops, the cause of much mains hum in audio equipment. This is probably the thinking behind only connecting screens at one end. As you'd be earthing the body of your machine back to the same point with fairly short wiring anyway it probably doesn't matter. Belt and braces is to make the cable so you CAN connect at both ends but be able to disconnect if you have problems.

On a safety note: The output of your VFD is at potentially lethal voltages and is isolated from the mains input so you get no protection from an RCD or other 'safety switch' on your mains supply. Make sure the spindle body is well earthed and use insulating sleeving over each connection inside the plug (this will help prevent you detonating your VFD as well). Recent spindles from Huan Yang have the body earthed via a fourth pin on the socket, but earlier versions had only 3 pins or the fourth pin was not connected.

Kit