I've searched so many threads, with so many different opinions on grounding, creating a grounding loop or not, etc. Long story short, I'm hoping someone can tell me which diagram is right (my bet is on A). I'm running 3-wire shielded (2 wire would have probably worked too), to the NO and C. I'm trying to figure out how to ground the shielding correctly. I understand the BlackboxX32 has built in capacitors, so I don't need to add in any ceramic capacitors. If that is wrong, please let me know if I need to add in a 0.01UF ceramic capacitor to the GND/SIG. I also don't think I should be doing anything with the shielding at the end other than cap it off - but I do have a spare wire if I needed to connect that to bring it back to ground. IDK, so many people saying so many things - what does our community say? Option A - I believe this is right: Option B - With Capacitor: Option C - No Capacitor but ground pulled from end: Option D - Do everything, because why not:
Option E is preferable: Xtension Limit Switch Kit onboard filtering. No need for shielded wire. None of your schematics has any signal pull up either, capacitor alone won't help much. Don't mix Mains Earth and DC GND! Mains earth stays seperate at all times, don't use it for shielding either
I have a very tight space, and at a different direction where the xtension switches won't work. Hence, the creativity. Inside a C-channel is the only place I could put it, on the z axis. Tight fit. Okay, how do I solve for this. I am sorry, not a electrical engineer. Where should it go? I don't have a mains earth in my shop. Would outlet ground work?
To DC GND or a seperate Earth Spike. Not to the outlet, which is mains earth. Grbl Wiki has a basic schematic
So, like this: Seems like I dont need the capacitor since you have the pull downs on the blackbox board. Correct me if I am wrong
You do want the capacitor and resistor. Resistor 10k between SIG and V+. Capacitor 0.1uF across SIG and GND
Correct yes. Better than no filtering. Ideally at the switch though, not the near end of the cable. That's why Xtension switches runs on 3-core cable. To get V+ to the switch for the pull-up. At the Blackbox side, it has onboard RC+Opto filtering already.
