Wiring help.

[dmgdesigns]

Help with wiring.

I don't understand all I should about this. I have a big PS that is capable of 60V at 40A. I don't think I will ever need this but that is what I have. I am using Gecko 320, Mach2 and the breakout board from Bob Campbell's web site http://www.campbelldesigns.com/ My servos are 60V 9A continuos and 20+A peak.

I have attached the layout of what I think I should do but as I mentioned I don't know all I need about this. I have a 20A DPDT switch that turns power on to the enclosure. As I see it nothing should happens when I flip the switch. On the face of the enclosure I have a small 6A switch that turns power on the the Breakout Board and 12V PS for the fans, an E-Stop DPST button and a couple of lamps just for looks. If Mach2 is not running the "Charge Pump" on the board will be 0V and the relay connecting the Xformer to power will be open so not power to Xformer or motors. Also the outputs to the relays controlling the spindle and Dust Collector will also be 0V. Now when Mach2 is running and the reset button is clicked the charge pump, pin 17 here will be active and the "Charge Pump" on the board will have 12V. This will flip relay and connect power to Xformer. All is OK while the NC E-Stop button this not pushed. Right????

Now when the E-Stop is pushed the 12V from the "Charge Pump" is lost and the Xformer relay is open and Xformer dies. This will happen with out depending on the B-Board or Mach2. Also E-Stpp jumper on the Breakout Board is open causing Mach2 and Geckos to halt and, Mach2 to have a E-Stop error. By the way this should also drop the charge pump signal pin 17 to 0V as well. With this wiring I would also get 0V from the charge pump pin 17 if the computer or Mach2 should fail. Right????

Now my questions.
1. Where do you break the power to the motors on E-Stop? Do you cut power to Xformer or after the Capacitor?
2. Is this a suitable way of wiring the machine or am I waaay out in left field here?

If anyone has a better, safer way to handle this I would appreciate the suggestion.
Thanks very much for the help.

[kevincnc]

Mark, you will definItely want to cut power on the secondary after the capacitor. Otherwise the power left in the capacitor still has the potential to move the motors far enough to cause damage.

[trubleshtr]

or just put a resistor across the capacitor to drain it.

[kevincnc]

That's true, a resistor should be used to slowly drain the capacitor when power is off for safety, but a properly sized resistor will still take too long to drain the capacitor without robbing lots of power during normal use.