3 Axis CNC router

[Neale]

Basically, that looks fine (once pin 14 is connected!) Main problem, which is the thing I noticed when I looked at your first diagram, is the use of three inputs on the CSMIO for fault inputs from the drivers. I'm not sure that you can configure the CSMIO to do that. The CSMIO can be configured to have one "drive fault" input; it monitors this pin and will stop the machine if it sees a fault. So you need to take all the fault inputs into the same pin. Because of the way the fault signals work, wiring them in parallel like this is fine. In my case, all the driver fault "-" pins go to CSMIO pin 2; the driver fault "+" pins go to +24V (as you have them) and obviously you need to take CSMIO pin 15 to ground.

I'm sorry if I confused things a bit; I had in mind that you could wire the fault signals in series with the e-stop switches (as shown in the CSMIO manual). However, I had forgotten that when I looked at doing this, it wasn't going to work easily for various reasons so I went back to the scheme broadly that you have, with the modification I have explained above - which actually simplifies wiring a bit as you can take each fault connection on the drivers to the adjacent driver and then one wire to the CSMIO.

One thing to bear in mind is that you have to be able to clear the driver fault. Easiest way is to remove and re-apply power and you can do this on your machine by hitting e-stop or by switching off power to the driver psu as you have a switch to do this. I think that the CSMIO tells Mach3 that an e-stop has happened on a driver fault anyway, though.