Just built a 5x4 cnc machine and close to getting it cutting...but
I am trying to source a VFD cable (8.5amps / 2.2kw), all i can find are 100ft reels.
Can anyone point me to a UK supply! I need around 15ft.
Also any real good details of the wiring, I have some instructions but not sure about the earthing on the spindle itself.
The fourth wire doesn't seem to be connected..!!?
Here you go. CSE Cables Website Home
The 4th wire won't be connected. Personally don't bother with an earth onto spindle has the VFD and main machine frame are earthed and VFD will shut down protecting it's self if detects short or heavy load. Just make sure the shielding is taken back to main earth point.
Big tip is to make sure the VFD connector terminals are soldered securely and no stray strands wires floating about and all wires are isolated well. Also that the wire is supported well so there's no stress on the connector. If not and the wire comes loose and shorts then it WILL more than likely KILL the spindle and possibly the VFD.? . . I've done this my self killing both spindle and VFD and know of others.!!
The wiring is easy. Just connect U V W If it spins reverse when first started just swap any 2 wires and it will spin right way.
I need a little clarification on some of your instructions. I have no clue about electrics apart from wiring up a plug!!
- earth connection just by the spindle -
Do you mean attaching the earth to the z-axis? Only mine is made of MDF, although it has a strip of angle iron which holds part of the carriage. Would it need to be attached to the angle iron.
-just one tapped hole in the Z-axis plate to screw the wire on to -
So the cable attaches to the spindle! How do i get the wire to do this, do i need to leave the earth out of the plug that attaches to the spindle.
Do you have any pictures that would make things 100% crystal clear for someone like me.
Appreciate your help, as its taken me 4 months to get to this point. Its all moving just need to work out the homing and start making splinters
Seen has often the spindle cable and Z & Y stepper cables often run in the same cable trunk then noise from the VFD could get introduced across to the stepper wires so If this is going to be done then make sure that earth goes to the main Star earth point in your control box other wise the potential for ground loops increase.
This then becomes a bit more awkward using the 4th wire has often the VFD is not in control box and that is why I prefer not to do this.!
I've never had a problem with shocks and even when my cable broke and dead shorted the spindle the fuse and trip worked, unfortunately the damage was done by then.!!
Not saying don't do it but make sure you do it correctly other wise you'll be pulling your hair out chasing ghost issues, like false E-stops or limit trips, missing steps etc which you won't automaticly realise are coming from this.?
Apart from the obvious danger to yourself from burning the house down if you completely get it wrong.!! . . .It's very possible you can damage the spindle or VFD if not correctly wired or careful attention to detail with wire connections.
Like my previous post says if you feel compelled to have an earth wire then in your case just take a wire from the spindle clamp bolt or any place that makes contact with the spindle body. Then take this wire back to the main Star Earth point in your control box.
Actually On reflection now knowing Stephens using MDF for a frame then yes I probably would run an earth from spindle but back to the star point like you have drawn NOT the VFD unless VFD picks it's earth from the star point.
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