Earthing?

[JAZZCNC]

Hi Edward.

The PSU will need mounting either directly to the back plate using stand offs or on separate backplate(with standoffs) which then mounts to enclosure backplate or Cabinet side. My prefered way is to mount on separate plate then fasten this to cabinet side as it saves space.
In either case if Metal enclosure you won't need Separate earth as the Whole Box will be Earthed. However if you want to bolt the gate so to speak then run separet wire from Star point to one of the holding boltings. !!!!!! WARNING !!!!! DO NOT put Earth wire to the Bolt which holds transformer.!

If Plastic case and PSU isloated then Good idea to run Wire from Star point to the point plate.

The main thing is you don't have Wires Earthing to different points, if running earthing wire then always to Star point.
Personaly Even with metal back plate and the component does have Earth connection I always take it from the Star point with wire and never rely on the back plate for Earth.
Same with Shield cables, while technicly could connect to back plate I don't. Always back to Star point. This way I never have any issues or chance for ground loops to occur.
Proud to say never have any ground faults or false trips on my machines and these little details are mostly why. These and good components.

In general you want to Fuse all AC devices with MCB ie: Main PSU, 24Vpsu, VFD etc. The DC devices like Drives, fans then I use Glass type fuses.

Regarding the cheap Prox switch then depends on what usage and accuracy/repeatabilty your chasing.?
If just limits then yes they are fine. If Router/Plasma etc then they are also fine for Homing. But if it's Mill and your chasing V-High repeatabilty on Home Sw then may pay to buy better quality.