What is the best way to ground a servo motor?

The power connector of the motor has a pin for grounding but it is not connected. However there is a tapped hole for grounding on the flange.

I guess the options for grounding are:
- Connect the gnd pin of the motor internally to the motor case. And that line goes to the drive's grounding input trough the power cable.
- Connect a single external grounding wire to the hole on the flange and connect other end to ... ? (fill in the ... please)

https://www.cnczone.com/forums/attac...d=407150&stc=1

Any conductor connected to the motor frame is basically needed, the one shown would go to the star point ground connection.
Wherever the service ground is connected.
Al.