Re: Wiring HuangYang VFD without grounding! How dangerous is this?
Some thing is not right, Bonding everything to the service ground at a common star point should be done.
The shielding can be connected both ends, but you need a separate earth ground conductor from VFD to spindle, and the spindle frame has to be at ground.
Did you check the spindle frame for ground potential? Some spindles do not have the earth connector terminal actually connected to the frame.
Al.
CNC, Mechatronics Integration and Custom Machine Design
“Logic will get you from A to B. Imagination will take you everywhere.”
Albert E.