New CNC Mill on the horizon

[Boyan Silyavski]

So on to the safety Circuit it is....

I am confident I have the bases covered on isolating the mains supply to the drivers on fault or Estop however what is the best way to isolate the spindle? as I have been reading removing power from the inverter is not always a good thing? what are people doing to make the spindle safe in an estop senario? (chinese 3 kw spindle setup)

When BOB is reset it stops giving On signal to VFD ON input so the VFD stops, hence VFD low voltage On is chained on the Estop line.

That then brings me on to drives, when I started the machine (many moons back) the drive and motors were ordered from china I was under the impression we were getting digital drives, having glanced over them at the time I did not really take any notice but it appears we have 3 of the DM860a drivers. Now given that this much effort has been put in I am thinking its worth switching these units out for the AM882 of the EM806 drives? Would this be a good move or a waste of time?

Waste of time, these are good DSP drives. Almost the same as the AM882.

[Boyan Silyavski]

However if you have the simplest 3kw inverter like the diagram below, care should be taken what voltage flows there. So if you board is 5v and the inverter is 24v or vice versa. Best would be that you have an Estop button with double switch circuit or you just use an enable output on Mach3 and a relay on your BOB.