Re: [CAD_CAM_EDM_DRO] Re: E-STOP SWITCH

Jeff:

Xylotex message is thanks to you.

Robert Williams

----- Original Message -----
From: <xylotex@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Sunday, December 08, 2002 5:48 PM
Subject: [CAD_CAM_EDM_DRO] Re: E-STOP SWITCH


>
> Hello,
> A 'momentary' switch is like a door bell switch. When you press
> it, it makes contact. When you let go, the circuit opens up. The
> important thing about an E-stop is that is 'latch' the event. If
> your motors were to be just shut down WHILE you were pressing E-STOP,
> they could come back ON when you let go of the button. For safety,
> what you want, is to hit the button once, and have everything shut
> down until you specifically remove the E-STOP input condition. There
> are two ways to handle this. 1) Mechanical: Once you press the E-STOP
> button, you must twist the button to release it from E-STOP
> condition. 2) Logic/electrical The First press of the E-STOP sets a
> latch that will hold the E-STOP state until you press another button
> to release the system from the E-STOP condition.
> Normally E-STOP circuits should be wired with a NORMALY CLOSED
> (NC) switch. Thus, if the E-STOP wire breaks(or gets cut), the
> circuit goes to an 'open' state, and the E-STOP condition is entered.
>
> Jeff
> www.xylotex.com
>
>
> --- In CAD_CAM_EDM_DRO@yahoogroups.com, "res0clvs" <rob.will@v...>
> wrote:
> > I think I understand what normally open and normally closed means,
> but can't guess what momentary means, will someone please
> explain "momentary"?
> >
> > Robert Williams
> >
> > [Non-text portions of this message have been removed]
>
>
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