Electronics for New Machine + Chinese Spindle + VFD

[mturneruk]

Hey guys.

Any chance I could bother you for your input again.
Worried about my enclosure being to small, and getting EMI noise problems.



1. Is the VFD in this enclosure a problem?

Motion control and Breakout board would be mounted on a shelf above the drivers.
I have bought belden shielded mains cable for mains wiring within the enclosure.
I will also use the shielded belden cable for connection to the spindle - Should it be grounded both ends i have read contradictory advice?

2. Should i be using shielding the power / signal lines to the stepper drivers from the transformer / breakout board within the enclosure ?

3. Does my grounding look right in the schematic ?

Thanks for any tips.
Martin

[dodgygeeza]

Way too small., you will need something at least double the size, also a fan to move some air about and no problem with having the inverter in the box.

[Clive S]

Martin

Have you thought about how you will operated the VFD controls, in my opinion I would not mount the VFD inside the control box.
All the grounding sheaths should go to one central point ie star to avoid ground loops. The drivers should not be daisy chained like you have shown take each driver supply back to the PS. It is generally not needed to screen the signal wires (I tend to use cat5) You don't show any E-stop.
.
Keep the cables from the drivers to the steppers as far away as possible from any signal wires.
.
Good luck with the build.

[mturneruk]

Thanks guys.

Is it to small because of EMI or because of heat ?

It's vented and i was going to chuck a couple of fans on it.

I decided that all cables in the box would be shielded.

Also i was going to make cut outs around the VFD and 3d print some additional vent covers to increase airflow.

I am planning on removing the touch buttons from the VFD which comes off as a unit attached to a ribbon cable and mounting that on the outside...

Not arguing with you, just wanted to understand the logic.

Cheers
Martin