Re: [CAD_CAM_EDM_DRO] Sound logic breakout question

R Rogers wrote:

>james_cullins@... wrote:
>Ron,
>It sounds like you have one of the early breakout boards.
>If you want every thing off before computer power. You could pick up 5v form
>the game port or USB port to activate a relay that would power the rest
>of the system.
>Is there a particular reason why you want to wire it this way?
>
>/// Yes, I want to have the system to where the PC must be on before the servo control system can be started. My 12 year old son was in the shop one day and I've been teaching him to run the manual mill. I was up front and unbeknownst to me he decided he'd use the CNC, he was making a part for his pocket bike. He hit the start button without turning on the PC and he yelled the machine is moving. I ran back and hit the E-stop. It was creeping on the Y and headed for a crash.
>
>The Estop/capacitor dump circuit is tied to a Main relay that shuts off the entire control including the Breakout board. I would like to use the jumper4 off of the board because Mach2 must be up and cleared before it is active however the control must be on powering the Breakout board before that can occur. Its a catch 22.
>
>Possibly just another switch on my console that powers the board is the answer?. Do you have any suggestions?
>
>Bob and Jim, thanks for the fast response to my question.
>
>Ron
>

Hmmm.

You may be able to use an ATX computer power supply for the control
board (and other controls, but obviously not the motors). The standby
power would be plenty for the breakout board and a few relays - I think
it's supposed to be 2 amps or so at 5V.

You can then use the output from the heartbeat detect to close the power
switch contact on the power supply, which would enable the rest of the
controls. You'd probably need a momentary contact, since ATX supplies
generally use a short contact to toggle power. I'm not sure what kind
of other signals need to go between the controls and the power supply
(like power good or similar), so there are a few details to work out.

It Just Might Work (tm)
- Steve