[SML] DMX through an E-stop button

[Dale Farmer]

If you can find an e-stop button that doesn't screw up the signal during normal operation than this would work.   But I seem to recall that one of the requirements of an e-stop button is that it bypasses the normal control routes and forces a safe halt to the process even if the control system is commanding it to go.  Also forcing depower of equipment so firefighters can go in to do what they need to do.    
  I don't know what the electrical code there in brasil might say, but I would consult with a local expert to find out minimum requirements.  
Dale
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-------- Original message --------
From: Michael Sauder via Stagecraft <stagecraft at theatrical.net> 
Date: 06/16/2015  15:29  (GMT-05:00) 
To: Stagecraft <stagecraft at theatrical.net> 
Cc: Michael Sauder <michael.sauder at gmail.com> 
Subject: [SML] DMX through an E-stop button 

Has anyone ever run a DMX feed through an E-Stop button? (One of those big red buttons mounted on machinery and such).
And/Or through a relay? (I have both solid state and mechanical available).
I posted before about a special effect I'm doing for a project in Brazil (I'm finally here! Been here for 3.5 weeks so far, expect to open around July 4th barring any unforeseen problems), in which we have 40kW of heat lamps running off a 12-pack of dimmers.
If anything happens to the DMX feed or show control system, we would like to ensure the heat lamps go off. The best way, presumably, would be something that cuts off power to the whole rack, but that would be more complicated and expensive.
The way I'm tentatively looking at is to set the dimmer packs to go to zero on loss of signal. The e-stop button or relay would be a way of forcing loss of signal, even if the DMX source is still online but the system is in some undesirable state.
Any experience with this?
Thanks!Michael S.

-- 
Michael SauderEmail: michael.sauder at gmail.comWeb: www.shownet.io

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