Thread: Wiring Diagram check
I think you mean the 'star ground'. This means all grounds from shields etc. all meet at one point, and this one point is then connected to the ground from your mains cable.
I'm not an electronics whizz but I think the idea is to avoid 'ground loops'.
Here is one of my older diagrams (a few changes since) - see the yellow cables which all join at a single point. This is then connected to the mains cable earth.
Here is a picture of my control cabinet - ground is yellow and green. You can see that all of these cables meet up at a group of terminal blocks that are right next to each other (this is my star ground point). Because they are special earth terminal blocks they also connect to the metal DIN rail underneath which effectively joins them all together at that point. The middle terminal block then has a single wire which goes back out to the mains earth.
Note that my VFD is completely separate (separate mains cable, shielding and earthing), but many people run everything off one socket.
Thanks routercnc for you explanations :) your cabinet looks great ! I've actually got the same DIN rail mounted terminal blocks / relays / yellow-green terminal blocks :)
My question was more about how you stop the spindle. On your diagram, I see the line that goes through the relay and connects to FWD and FVD control interface, but what powers it ? Is that wire getting 24V, or is it just a loop on the VFD itself ? Here is how I understand it: when you power up everything, the spindle can move forward because the loop DCM/FWD is closed. If the relay goes off, the circuit opens and the VFD stops the spindle because its DCM/FWD loop is broken. I am wrong again ?
Also, could you take another photo of your linear PSU please :) ? I like the way you did it but the resolution won't let me clearly see how you connected the capacitors together (it looks very neat).
Last edited by eurikain; 16-01-2016 at 11:35 PM.
As Dean says just a simple circuit connecting 2 wires together.
Away from pc and workshop but there are photos of power supply on my build log 'router mk 3' or something like that
Capacitor cables are one cable with the sleeve cut out at the right intervals then soldered to the terminals
Last edited by eurikain; 30-01-2016 at 12:02 AM.
You can walk away from the machine and Know it will stop the spindle when finished. It will Stop the Spindle between Tool changes and Start again when press Cycle start. Which is great when learning because it's common for people to push Cycle start after tool change then realise they haven't started the spindle.!!
Last edited by cropwell; 31-01-2016 at 01:27 PM.
Rob I see the trouble with this is starting the machine code with the switch not in the correct position and then not getting to the Osh#t button fast enough..Clive
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