Quote Originally Posted by Radu_Andrei View Post
Hi Clive,
What do you mean by a star point?
So I should connect all the shieldings at one end for the spindle, the steppers and the limit switches, to a common point in the case. The frame has a common ground/earth with the spindle, which goes into the vfd and from there into one iron rod in the ground. Everything else, has the ground wires sent into the main electrical grid.

After all the shields are connected to this star point, where should this star point be wired to?

Regards,
Andrei
OK I am not familiar with how you receive you incoming mains in your country In the UK the electric company supplies a ground point (that in general is also connected to our neutral) But in Spain in the country areas the supply does not include a ground So you have you use an earth rod in the property.

In your case I think I would connect the shield of the cy4 core going to the spindle to the star point at the control box end only. Ie don't connect the other end to the earth in the VFD.

Thee start point is connected to the main ground (if that is a earth rod then that)

What you are trying to achieve is not to get any ground loops.

Do you need to take the mains for the VFD into the control box.