3 Axis CNC router

[JoeHarris]

Not very easy to read labels but I suspect your using the HV option on controller to turn on contactor.?
Don't use it my self because it's pain in arse.? It will drop the power to drives every time you put mach into reset. This means because the motors jump when powering drives you'll have to home the machine everytime mach goes into reset. Many times that will be ok but there are others when you don't want that. Like when making simple setting change etc.
I'd just have the E-stop safety relay switch contactor on.

Couple of small things I see.

#1 Fuse the Water pump.
#2 Run water pump 0V thru VFD relay so only comes on when spindle running.

Regards VFD power then wouldn't get too OCD about it.! The controller will Stop it spinning when see's E-stop so could leave it out of the E-stop system if you like.
But if you do want to Kill it then use Timer relay which is set to drop power after spindle stops spinning. Personaly I wouldn't bother because the few times you will Kill power while spindle is spinning won't hurt the VFD. Plus the VFD takes several sec's to power down anyway because of Caps. By which time spindle will have stopped.! . . . . . Anyway If Cutter is embedded in your hand you won't really care because you'll passout before VFD powers down.

Thanks for the Help!

I have added a fuse to the water pump (not sure what ampage for that yet as haven't chosen a pump yet.)

I have added another contactor and a switch on the 24v circuit to control the pump and VFD

I'm not sure what you mean when you say you just have the E-stop safety relay switch the contactor on. Presumably I still want the drive fault signals connected to the pilz?



Also, I am struggling with grounding the various components. Do I need to connect the motors or drives back to the star ground and if so, how?!

Also should the earth terminal on the VFD just go back to the earth terminal on the plug or the star ground and should the CSMIO just go back to the star ground or should this also be connected back the earth on the power plug?

I know similar questions have been asked and answered elsewhere but I'm struggling to piece it all together...

Thanks guys.

[JAZZCNC]

Thanks for the Help!

I have added a fuse to the water pump (not sure what ampage for that yet as haven't chosen a pump yet.)

I have added another contactor and a switch on the 24v circuit to control the pump and VFD

I'm not sure what you mean when you say you just have the E-stop safety relay switch the contactor on. Presumably I still want the drive fault signals connected to the pilz?

Also, I am struggling with grounding the various components. Do I need to connect the motors or drives back to the star ground and if so, how?!

Also should the earth terminal on the VFD just go back to the earth terminal on the plug or the star ground and should the CSMIO just go back to the star ground or should this also be connected back the earth on the power plug?

I know similar questions have been asked and answered elsewhere but I'm struggling to piece it all together...

Thanks guys.

Sorry Joe just looking back at your build and didn't see these questions. So here goes.

I'm not sure what you mean when you say you just have the E-stop safety relay switch the contactor on. Presumably I still want the drive fault signals connected to the pilz?

Yes still want fault signals in E-stop. What I meant was use another contact on the Relay and run 24V thru it which then turns on Mains Contactor.

Also, I am struggling with grounding the various components. Do I need to connect the motors or drives back to the star ground and if so, how?!

Only the Shield of the Motor cable and only the control box end needs grounding to Star point. To save wasting wire and stripping insulation back so shield wire reachs star point and drives just run single wire from Star point to point near drives and solder to the Shields or use connector block.

Also should the earth terminal on the VFD just go back to the earth terminal on the plug or the star ground and should the CSMIO just go back to the star ground or should this also be connected back the earth on the power plug?

The Earth wire on the Plug and the Star point should be the same thing, that's the whole idea. You have one Point that the main Earth comes into which is then distributed to all that need Earth. You also take all shields back to this point.

So in this case if the VFD is in the main Control box case (which personally I don't like) and turns on with control box you would take to Star earth point.
The shield for Spindle cable is best or easier if connected to the Earth Terminal in VFD.

If the VFD is external then just use the cables earth wire back to Plug. Same connection as above applies with shield.

IP-M Earth goes to the Star point.

[JoeHarris]

Sorry Joe just looking back at your build and didn't see these questions. So here goes.

Thanks Dean. I will digest this and revisit the circuit diagram. No doubt there will be more questions! I would also like to pick your brains on the power supply if possible...


belt tensioner pulleys are in.


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