Originally Posted by
mactec54
So, you have more than one Grounding point in the Cabinet, you should only have (1) main Grounding Point. (Star Ground)
That Grounding Lug you have is not suitable for multiple Ground wires. there are (2) types you can use they are easy to make if you can't buy them.
Your VFD Drive and its Mounting Plate, also needs to be Grounded to this Grounding Bus, Plus your Spindle Ground.
You most likely will need an EMI Power Filter, I recommend this TDK Lambda EMI Power Filter RSEN-2030 this has to be mounted as close to the VFD Drives Ilinput Power Supply as Possible