4' x 4' x 8" Router Build

[JonnyFive]

Whilst progress is slow on machining all the parts I need I have put together my attempt at the contrrol circuitry. I have to give a massive shout out to both ROUTERCNC & Joe Harris for their superb videos and documentation covering this side of things - I've watched / read it all several times!!! Using their content, some intense Googling and reading of manuals this is what I've come up with:


CNC CIRCUIT DIAGRAM V3.pdf

I do have a number of questions, hopefully someone will be able to help:

1. Is a mains filter required for the VFD? I notie=ced ROUTERCNC used one but Joe didn't
2. I'm assuing I don't need to connect up REV on the VFD as I'll only be running the spindle in one direction?
3. I've seen diffferent ways of connecting up the step & direction pins from the motor drivers - either commoning up the +ves or the -ves - what's the difference? Is it to do with picking up the leading or trailing edge of the signal? Which should I use? I'm using closed loop steppers if it makes a difference.
4. My motors came with long cables with extensions - are they ok to use? Or should I be making up my own screened cables?
5. Do I need to run an earth wire to the gantry & frame?
6. Is the rotary interlock switch necessary?
7. Do I need to connect the spindle pin 4 to earth? I've read contradictory things about this.
8. Do I need to connect the ENA+ & ENA-?
9. Do I need to twist the PUL & DIR wires?
10. Is it acceptable practice to crimp 2 wires into one ferrule? Or put 2 ferrules into a single terminal?
11. Should all the 24V feeds going to the AXBB-E controller be from the switched 24V or permanent supply?

I'm sure there will be many more questions to come. Any feedback would be much appreciated.

Cheers