First time build - Steel Frame CNC Router

[JAZZCNC]

Will look at this properly for you later but see one thing I'd change. Use contactor rather than relay contact for turning on transformer. Still use relay for safety but have turn it on contacter which is better suited to high current.

Also what kind of limit switch are you using.? On quick look if Proximity then think you have them wired wrong. If Prox what type NPN or PNP.?

[examorph]

Will look at this properly for you later but see one thing I'd change. Use contactor rather than relay contact for turning on transformer. Still use relay for safety but have turn it on contacter which is better suited to high current.

Also what kind of limit switch are you using.? On quick look if Proximity then think you have them wired wrong. If Prox what type NPN or PNP.?

Thanks Dean, they are NPN proximity switches, I think you recommended these for another user http://www.ebay.co.uk/itm/1417817891...c=1&rmvSB=true
Another thing I noticed I had cocked up on was showing them as "limits" on the diagram, they are actually homes and I was planning on using soft limits within Mach3, will get the drawings updated showing this and the contactor. Thanks

EDIT: Is it also worth running the VFD through the same contactor as the transformer or should I keep that one running through the relay?

[JAZZCNC]

Ok had good look and only see few things would change.

First home or limits makes no difference to how wired and you had it wrong. See pic how to wire Npn correctly.
Now if you have the switch travel with the axis and sense target you can have one switch work has home and limits for that Axis. Just few settings inside mach3.

Regards the VFD then yes it would be better run thru contactor than Relay contact.
However personally I wouldn't Kill power to VFD just sending it stop signal is enough IMO. While strictly it's safer to Kill power it's also pain in the arse waiting for VFD to power up just because you put machine in Reset mode. It's personal thing really but IME it's more trouble than it's worth and spindle being forced into stopping is safe enough at DIY level. The Controller will also drop the Spindle output so stops anyway when E-stop occurs.

Next I would control the Water pump using the VFD on board Relay. This way the pump only comes on when spindle is spinning.

Fuse sizes for drives are too large. 5A is more than enough.

Edit: Noticed on pic forgot to change input numbers but you should get the picture.

[examorph]

Thanks Dean, drawings almost updated but I am still struggling with figuring out how to wire the water pump direct to the VFD on board Relay
Also, after searching many posts I noticed that most people seem to be using a pump ran off of mains voltage instead of 24VDC as shown, so would something like this be more suitable? http://www.ebay.co.uk/itm/2000-L-H-W...3D390532181450
If so, how would I wire it direct to the VFD so that it has mains supply only when spindles running please? Thanks.

[Davek0974]

If using a small mains pump, as i do, use a separate relay to control it from the vfd.

The vfd has a relay - you need to set the parameter which turns this on when the vfd is in the 'run' condition.

Next, feed this relay a 24v supply to the 'com' or common contact, then from the 'n/o' or normally open contact you go to the +(if marked) terminal on your pump relay, the - terminal then goes back to your 24v supply.

Now you have a separate relay which turns on with the vfd. The relay will have common and normally open contacts - feed a fused live supply (1A or 2A fuse) into the common, then normally open to your pump, other pump lead back to neutral.

That should be it :)

The reason i would do this is for isolation - i don't like having 240v mains anywhere near the logic side of the vfd terminals.

[JAZZCNC]

Exactly like dave says but here's pretty pic just in case. Don't forget to change VFD param.

If you do end up using 24Vdc pump you can Dump the Extra Relay just run 0Vdc thru FA FB terminals straight to pump.

[examorph]

Thanks for all the help guys, this makes things so much more clear! If I understand this right, would using terminals FB & FC have the same result for 250VAC? Sorry if its a daft question as i'm clueless when it comes to electronics!!

Please if you get the chance could you give the updated schematics a final once over? Only additional thing I changed further to the suggestions was earthing the Spindle to the VFD rather than star point as I guess will make wiring easier.

I noticed that AliExpress have a sale going on Friday, so would I be OK going ahead and buying the below whilst the deals are on?
3x - https://www.aliexpress.com/item/New-...2-5560f2d46d31
1x - https://www.aliexpress.com/item/Wate...a-7162575c4107

I already have a 80mm spindle clamp but sale price seems to beat all eBay offers I can find for just the spindle/VFD alone

Schematics