Re: Grounding VFD
Yes, normally you would set up a star ground point that includes the system Earth conductor.
Both VFD GND ands the VFD cable shield would be connected at this point.
There is also a recommendation by Siemens to carry out equi-potential bonding, this as all metallic parts of the machine be bonded to an earth conductor.
I have posted the Siemens paper here a few times.
CNC, Mechatronics Integration and Custom Machine Design
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Albert E.