Limit switch /vfd issue

[Bentowle]

I have been having a issue with my vfd, if I unplug the z axis limit from the control box I have no problems, when I move the limit switch near the box the spindle rpm error happens .

[Staggeble]

I fixed this issue by connecting the shielding of the limit switch to the ground.

[Bentowle]

I fixed this issue by connecting the shielding of the limit switch to the ground.

Sorry if this is dumb which ground? Do I connect it to?

[Staggeble]

I used this guide for my setup. https://wiki.printnc.info/spindle_settings.pdf

[Bentowle]

i ended up needing to add chokes.