Need assistance with electric enclosure please (CSMIO/AC Contactor issue)

[routercnc]

If you still want to include a contactor to the VFD, then I'm pretty sure that if you hit the e-stop (and turn off the mains power to the VFD) it will not like having the spindle spool down and feeding power back into it when it is not on. Would it damage it? Not sure. But I wouldn't risk it myself.

I see in one of your earlier posts that you have a braking resistor, which can allow quicker ramp downs (although I've not used mine as it is plenty quick enough without). If you plan to use it I would imagine that killing the power to the VFD would not allow it to use the resistor and it would coast down over a much longer period.

So if you still want to do this I think you would need a delayed timer on the contactor to switch it off after say 5 seconds, depending on your ramp down parameters. This adds complication, but I know Dean has done this so it is possible. This is in addition to the e-stop logic signal telling the VFD to stop, which you would do first to stop the spindle safely under VFD control.




I seem to remember reading some time ago that you can be specific and tell the VFD that this is an emergency (not just a regular stop / start command) and it will do an emergency ramp down / stop which is quicker.