Re: e-stop sceme

Mike:

I'll be happy to email you the file tomorrow (it's on my office
computer). Is JPG format OK or do you preffer Visio?

If I should be cutting other lines to protect the drives, someone
please let me know. I have a drain resistor on the power supply
capacitor, but when I hit E-Stop, I'm currently only cutting the AC
side of the transformer. Should I throw some relay contacts in to
cut the DC side as well? Any preference as to which to cut first?
I can redesign the circuit pretty easily to let the E-Stop mushroom
kill anything (or everything for that matter), just would like to
know what to cut.

My E-Stop (on manually pushing Stop button or table hitting limit
switch) currently cuts the the AC feed to the stepper motor power
supply transformer (stopping the motors from turning), cuts the
motor controler of the Bridgeport and applies the pneumatic brake.
It also sends a signal through the breakout box to disable the
step/dir feed from Mach 1/2.

To start machine, the "Start" button must be pushed.

Regards,
Jeff

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "zbushz" <mbush@l...> wrote:
> Jeff,
> I looked at your photos... Nice work. I can't quite read the
diagram.
> The photo is small and if I enlarge it the print detail goes. My
first
> question in this e-stop question is what is the best way to shut
off
> power. I can imagine having relays on the ac to the breakout board
and
> the dc power in and cutting both with the "big red mushroom". It
would
> be good to tell the software what has occured, though maybe not
> nessasary(this is an emergency). Will this hurt the drives? Marris
> has a file that cuts off the AC to the power supply then dumps the
> capacitor( this is in the files section of cced, DC brush
servodrive
> E-stop). Is this the best way or can I use a switch(contactor) at
the
> dc input. I may use a 220 VAC power supply. It seems to me that
Marris
> suggested shuting off the ac then the dc ...can I shut off both at
> once without harming the geckos. There haas been much disscussion
> about e-stop but not much practical information.
> Thanks
> Mike Bush