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Press to Test

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gholland(at)gemini-resour
Guest

Posted: Sat Feb 04, 2006 6:20 am Post subject: Press to Test

Hi!



I'm trying to wire in a Oak MS25041-8 Press to Test Sx. Unfortunately it's

during a severe bout of multiple senior moments!



Example can be found at http://tinyurl.com/crxvy



My aim is to press this test Sx and illuminate a panel of Annunciator lights

that are isolated by diodes from each condition feed and check bulb state

prior to start up checks and general switch on. The Sx has 3 connections and

the capability to illuminate the press button on actuation. I can not get it

to illuminate Annunciator Panel.



Any ideas. My thoughts are at best confused now but with the bulb as part of

the circuit is their a resistance load isolating power.



Any help gratefully received. Medication is the next step!



Regards



Gerry

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nuckollsr(at)cox.net
Guest

Posted: Sat Feb 04, 2006 5:27 pm Post subject: Press to Test

At 12:00 PM 2/4/2006 +0000, you wrote:



 	  Quote: 	
		  

<gholland(at)gemini-resourcing.com>



Hi!



I'm trying to wire in a Oak MS25041-8 Press to Test Sx. Unfortunately it's

during a severe bout of multiple senior moments!



Example can be found at http://tinyurl.com/crxvy



My aim is to press this test Sx and illuminate a panel of Annunciator lights

that are isolated by diodes from each condition feed and check bulb state

prior to start up checks and general switch on. The Sx has 3 connections and

the capability to illuminate the press button on actuation. I can not get it

to illuminate Annunciator Panel.



Any ideas. My thoughts are at best confused now but with the bulb as part of

the circuit is their a resistance load isolating power.



Any help gratefully received. Medication is the next step!



Regards



Gerry


	


      The press-to-test feature of this fixture is designed

      to accommodate only the lamp contained within the fixture.

      I have crafted circuits that would sense when the PTT

      feature is actuated and used that signal to do other things

      as well. Such a circuit could be used to initiate the PTT

      function for the annunciator panel. As you've noted,

      the self-contained lamp is ALWAYS in series with the

      fixture's power draw hence, if this lamp burns out, you

      loose that lamp plus press-to-test capability. But then,

      it would certainly alert you to the fact that the one lamp

      is burned out . . . cause ALL the lamps would fail PTT.



      I'd need to know more about what kind of signal tests your

      annunciator panel lights and what kind of signal illuminates

      the lamp in your MS25041-8 fixture.



      Bob . . .

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gholland(at)gemini-resour
Guest

Posted: Sun Feb 05, 2006 2:09 am Post subject: Press to Test

Bob Hi!



As ever thanks for your useful response.

 

 	  Quote: 	
		       I'd need to know more about what kind of signal tests your

     annunciator panel lights and what kind of signal illuminates

     the lamp in your MS25041-8 fixture.


	


I honesty I had not thought the whole thing through at all!



I'm applying a test voltage to my various warning lamps using diode

protected circuits and a normal press to make contact Sx.

It was one of those days!



Regards



Gerry

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nuckollsr(at)cox.net
Guest

Posted: Sun Feb 05, 2006 10:00 am Post subject: Press to Test

At 10:01 AM 2/5/2006 +0000, you wrote:



 	  Quote: 	
		  

<gholland(at)gemini-resourcing.com>



Bob Hi!



As ever thanks for your useful response.



 >     I'd need to know more about what kind of signal tests your

 >     annunciator panel lights and what kind of signal illuminates

 >     the lamp in your MS25041-8 fixture.



I honesty I had not thought the whole thing through at all!



I'm applying a test voltage to my various warning lamps using diode

protected circuits and a normal press to make contact Sx.

It was one of those days!


	


   The press to test lamp fixture has a schematic that looks

   like this:



http://www.aeroelectric.com/Pictures/Lighting/PTT_Dim_Fixture.jpg



   The details I was needing to see if your single-ptt-button

   thing would work was how your lights are wired. See:



http://www.aeroelectric.com/Pictures/Schematics/Ganged_PTT_Scheme_1.gif



   Here . . . ALL lamps are pulled up from ground to illumnate.

   In this case, you can used the PTT feature in the MS25041 fixture

   to drive a transistor that will cause ALL annunciators to receive

   PTT power when depressing the single fixture. If any of your

   lamps are pull-down-to-ground, then you need a second transistor

   and a few more parts to drive the whole array of lamps.



   Bob . . .

      < What is so wonderful about scientific truth...is that >

      < the authority which determines whether there can be   >

      < debate or not does not reside in some fraternity of   >

      < scientists; nor is it divine. The authority rests     >

      < with experiment.                                      >

      <                            --Lawrence M. Krauss       >

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