Re: Sound logic breakout question

I am still building mine and I'm not using this breakout board so i
know nothing about this board, so no expert here, but the way i put
mine together is, (If I can explain it right)!

I am using two relays with a reset switch on what I call a controll
panel mounted by the computer screen. My power supply has two voltage
outputs, one at 62VDC and the other at 24VDC. So what i did is wire
one 24VDC relay to supply the AC into the power supply, this relay is
also tied to the E-Stop and hard limits, so if any is hit it kills
the AC to the power supply and inturn kills the voltage to the relay,

Now, I took a 12VDC relay and tied it to the reset switch and use
power from the computer power supply for this relay, when the
computer is on I can hit the reset button (a momantary push button)
it engages the 12VDC relay and supplies AC to the power supply and
the power supply inturn 'LATCHES' the 24VDC relay to maintain power
to the power supply, then the 12VDC relay disengages, and the 24VDC
relay mantains the power supply utill I hit the E-Stop or a hard
limit.

This also has the beniffit of if the computer is off I can not
energize the 12VDC relay to turn on the power supply.
This is using an AT style computer power supply, I do not know about
the ATX type power supply. but wiring a small 12VDC transformer in
with the computer power to power the 2nd relay could also work.

Maybe a little food for thought.........
Good Luck.....Jimmy



--- In CAD_CAM_EDM_DRO@yahoogroups.com, R Rogers <rogersmach@y...>
wrote:

> Hi all,
>
> My machine control is wired so everything in the control is turned

on and off through a main relay wired to the "Start" and "E-stop"
circuit. When I shut down, it shuts the whole control down even the
Mach2 breakout board.

>
> I want to wire it so if the computer is off, the machine control

cannot be started. I'm aware that output 4 is activated when the
software is up and software E-stop cleared however, I have to start
the control which energizes the B/out board so the output 4 would be
energized. I'm wanting to add a solid state relay in the start
circuit off of output 4. But I have to start the control to energize
it. I dont want to wire the Breakout board seperate from the rest of
the control. I like the fact that when I shut down, it kills
everything.

>
> Here is my question: I noticed with the control shut down and the

PC running there is an LED in the middle of the board illuminated
obviously receiving power from the LPT port. Is there somewhere on
the board in this state that I can get a low voltage that is isolated
from the LPT port to control a solid state relay that would in turn
allow the control to be started?

>
> So, if the PC is on I can start the control. If the PC is off the

control Start circuit would be inactive. It would be nice if the PC
on and Mach2 loaded and cleared were the only way the control could
be started. Possibly an unused output pin at the LPT in Mach2? Or
maybe just another switch/relay to turn the B/out board on first at
start up?

>
> Ron
>
>
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