Which version of the power supply do you have? V1 is a rectangular box with a rotary dial, V2 has a beveled part with push buttons.
I have V2, and there is no grounding wire from the power supply to the table. There is a grounding wire from the junction box (where the power supply is plugged in, and where the motor is plugged in) to a gold plated grounding post the underside of the top plate of the table. There’s another gold plated grounding post attached to the AC motor, but without anything attached to it. This is how the table was configured when I bought it new.