[Arche]

Ah, ok, I understand now, this left screw, when there is no continuity in my case. I can use just for easier attachment
of wiring from terminal 9 with additional wire and connect it with power cord earth since I would need longer earth wire from power cord to right side, which is not practical.

Thank you for advices and clarification

[mactec54]

Ah, ok, I understand now, this left screw, when there is no continuity in my case. I can use just for easier attachment
of wiring from terminal 9 with additional wire and connect it with power cord earth since I would need longer earth wire from power cord to right side, which is not practical.

Thank you for advices and clarification

Then you install a Ground Bus like this Snip and connect all Grounds to this one point

Connect to Bus
Input Power Ground
VFD Drive Ground #9
Spindle Ground