Re: [CAD_CAM_EDM_DRO] latching E-stop button and relay vs. momentary E-stop button and latching relay

Monte.

The typical Estop (EPO) button is a normally closed push button (switch)
that needs to be twisted to release it.

I use mine in my electrical enclosure and our breakout board. The switch
that I use has two sets of contacts. One set goes back to my breakout board.
The second set turns off power to my power supply.

In the breakout board the EPO switch connection turns off all outputs and
drops the 5 volts to the optical isolators in the Gecko drive. It also tells
Mach3 that the EPO switch has been pushed. Mach3 then drops the charge pump
(safety signal) and stops sending step and direction signals to the drives.

In my enclosure. twisting and releasing the Estop button will not restart my
power supply or have Mach start sending pulses again.

Once the emergency has been cleared, then I can release the Estop button,
click on the Mach reset button on the screen. Once Mach starts sending the
charge pump signal My breakout board turns on a relay in my power supply
board which turns on my power supply.

I hope that this sequence helps you.


Robert Colin Campbell
Bob Campbell Designs
www.Campbelldesigns.net
Mach 2/3 breakout boards
Relay boards
Spindle Speed boards
Stepper motors
Plasma Torch Height control

----- Original Message -----
From: "Monte" <montejw@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Sunday, May 11, 2008 12:47 PM
Subject: [CAD_CAM_EDM_DRO] latching E-stop button and relay vs. momentary
E-stop button and latching relay


> Is this an either/or? I've seen diagrams showing both, does it make a
> difference which to use, other than it depends on the e-stop button
> you might have on hand?
>
> I bought an e-stop button some time ago (can't locate it right now),
> and I think it's a mechanically latching button. I wouldn't need to
> wire the relay as a latching relay would I? Or can it be wired as a
> latching relay for another layer of redundancy of sorts.
>
> For a small mill (Taig, 200 some oz steppers, 100 ipm rapids MAX,
> probably more like 50, 20 tpi leadscrews) would cutting the power
> supply to the stepper drivers and spindle be adequate? I don't have a
> BOB as yet, so I'll deal with lost position and all that with Mach.
>
> Monte
>
>
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