Build Thread Mach3 to Acorn

[Leo Voisine]

WOW - I am just loving this forum. Youz guyz are just awesome. I wasn't sure about the DCM connection, but I thought that would work. Glad you cleared that up. I now have a clear path and will hook it up today. Thank you

[Leo Voisine]

Everything except the connections to relay outputs 7 and 8 look correct.

Use the Normally Open (bottom in this orientation) and common (center) terminals for these connections. Put S1 and S4 to the NO terminals and then connect the relay common terminals to the DCM terminals on the VFD.

If you pull out the little 3 pin terminal block plugs from the relay board, you will see a graphic similar to what is shown on our schematics in case it is not clear which terminals are NO or NC. I have to do that myself sometimes.

Just to clarify --- Connect BOTH 7 & 8 COM to DCM on the VFD (a jumper from 7-8 COM)

[centroid467]

That would work but it is best to run the OUT7 COM to DCM through a spare or auxiliary contact on the main contactor to have the E-stop remove the run command from the spindle.

I believe you should set OUT7 to VFDEnable in the Wizard rather than SpinFWD for your wiring.

[Leo Voisine]

That would work but it is best to run the OUT7 COM to DCM through a spare or auxiliary contact on the main contactor to have the E-stop remove the run command from the spindle.

I believe you should set OUT7 to VFDEnable in the Wizard rather than SpinFWD for your wiring.

I might be able to do that. Still a lot I don't understand but there is already a set of wires from what I thing is the 220v main contactor to the Estop switch. I can connect the OUT7 COM in series to that. Does that make sense?

[centroid467]

That would work but it is best to run the OUT7 COM to DCM through a spare or auxiliary contact on the main contactor to have the E-stop remove the run command from the spindle.

I believe you should set OUT7 to VFDEnable in the Wizard rather than SpinFWD for your wiring.

I might be able to do that. Still a lot I don't understand but there is already a set of wires from what I thing is the 220v main contactor to the Estop switch. I can connect the OUT7 COM in series to that. Does that make sense?

No, that is not a good idea. Do you mind posting a picture of your contactor? The wires going between the E-stop switch and the contactor should be going to the control (coil) terminals on the contactor.

Are there any open pairs of terminals on it?

[Leo Voisine]

I hope this helps.

Here is a series of pics

One red wire goes to a main power switch to turn on the machine wirh the ESTOP button in series
The small blue wire goes to the power switch

I do not know what this is.
Seems like it only establishes a ground

I also found and downloaded the PDF for the CJX2-32

CJX2-ACContactor.pdf

(733.65 KiB) Downloaded 7 times

[centroid467]

This helps a lot!

Run the connection from the COM terminal of OUT7 to the DCM terminal on the VFD through the 13 NO and 14 NO terminals on the contactor.


The mysterious object in the last image is an EMI filter of some form. Probably best to leave it alone if you are leaving the 240V wiring as is.

[Leo Voisine]

On the EMI filter

I WAS going to use the 24v out fron the power supply that is powered from the out of the EMI to power the acorn, but when estop is pushed the 24v to acorn is disconnected. I decided not to use that source to power the acorn so that wiring is just wasted.

Maybe I can remove the wires from the EMI to the power supply and just leave the EMI there as a decoration. Seems that this is where the GND comes from?????

[suntravel]

EMI filter should be wired after the contactor close to the VFD

If it is screwed to the grounded metal plate in the cabinet, no need to connect GND from its housing, since it is already grounded.

Uwe

[centroid467]

Ok, I am starting to get confused about the original wiring on this machine. Please post some pictures of the entire cabinet so we can see what is going on in there.

From your diagram, it looks like the main 240V input to the box goes through the contactor first which is not quite right. If there's a main disconnect switch, it should be going there first then to circuit breakers and/or fuses before going out to individual devices and the contactor. As drawn, hitting the E-stop will cut power to the Acorn which you have already found out.

From your description, the main disconnect is the contactor. That is probably fine but I am curious as to why there are no fuses or breakers on the VFD. I am also curious about where the voltage that goes through the contactor coil, E-stop switch, and main power switch comes from.

You can remove the EMI filter or leave it as a decoration... It should not be supplying the ground to the whole system - there should be a ground conductor coming from where the main 240V does (from the wall or a junction box or similar) and it should terminate somewhere on the cabinet. I would probably change the input of the EMI filter to come from before the contactor and keep using it to filter the incoming power for the Acorn power supply. However, the main power switch will no longer turn everything off so that would require using a main disconnect switch (or another contactor as one) to shut down everything.