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Press to Test

 
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gholland(at)gemini-resour
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PostPosted: Sat Feb 04, 2006 6:20 am    Post subject: Press to Test Reply with quote

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
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PostPosted: Sat Feb 04, 2006 5:27 pm    Post subject: Press to Test Reply with quote

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
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PostPosted: Sun Feb 05, 2006 2:09 am    Post subject: Press to Test Reply with quote

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
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PostPosted: Sun Feb 05, 2006 10:00 am    Post subject: Press to Test Reply with quote

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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