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E-Bus Off/On Indicator Light

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gordonrsmith921@yahoo.com

Joined: 06 Oct 2009
Posts: 24

Posted: Tue Jul 27, 2010 8:33 am Post subject: E-Bus Off/On Indicator Light

I would like to include an Off/On indicator light (LED) for the E-Bus alternate feed when using a relay as in Z-32 for a heavy duty E-Bus Alternate Feed.  I understand that the LED will have to include a series resistor in any case.  

   

My questions are regarding both the plus 14V. source for the light and the pull to ground for the light.  Can the plus 14V. come from the power to the relay or must it be a separate source?  Can the ground side of the LED be tied to the ground side of the relay coil going to the switch or must it be separate? Can these be mixed and matched in any way.  

   

I have illustrated the 4 combinations using Z-32 as a basis.  Please see the attached drawings.  

   

Gordon Smith

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nuckolls.bob(at)aeroelect
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Posted: Tue Jul 27, 2010 9:24 am Post subject: E-Bus Off/On Indicator Light

At 11:31 AM 7/27/2010, you wrote:

  	  Quote: 	
		   I would like to include an Off/On indicator light (LED) for the E-Bus alternate feed when using a relay as in Z-32 for a heavy duty E-Bus Alternate Feed.  I understand that the LED will have to include a series resistor in any case.

  

 My questions are regarding both the plus 14V. source for the light and the pull to ground for the light.  Can the plus 14V. come from the power to the relay or must it be a separate source?  Can the ground side of the LED be tied to the ground side of the relay coil going to the switch or must it be separate? Can these be mixed and matched in any way.

  

 I have illustrated the 4 combinations using Z-32 as a basis.  Please see the attached drawings.

  

 Gordon Smith 	


   Suggest you wire the LED in parallel with the

   relay coil. If the light is lit, at least there

   is power to the coil terminals and it's because

   the switch is closed. Further, if you put the

   LED current limiting resistor at the relay, then

   potential fault current in the LED "hot" wire is

   inherently limited by the resistor and no fuse

   or other protection is called for.



   Alternatively, you can take power directly from

   a tap on the e-bus itself.



 

   Bob . . .    [quote][b]

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gordonrsmith921@yahoo.com

Joined: 06 Oct 2009
Posts: 24

Posted: Wed Jul 28, 2010 6:43 am Post subject: Re: E-Bus Off/On Indicator Light

Therefore I assume it is OK to tie the ground sides from the LED and the relay coil together through a single pole switch.

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nuckolls.bob(at)aeroelect
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Posted: Wed Jul 28, 2010 7:00 am Post subject: E-Bus Off/On Indicator Light

At 09:43 AM 7/28/2010, you wrote:

 	  Quote: 	
		  

<gordonrsmith921(at)yahoo.com>



Therefore I assume it is OK to tie the ground sides from the LED and 

the relay coil together through a single pole switch.


	


   Sure . . . as long as multiple loads (coil and LED)

   that share ground through switch also share the same

   source of power.

   Bob . . .

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gordonrsmith921@yahoo.com

Joined: 06 Oct 2009
Posts: 24

Posted: Wed Jul 28, 2010 7:51 am Post subject: Re: E-Bus Off/On Indicator Light

So if the power source for the LED came directly from a tap on the e-bus itself as you suggested as an alternate, in that case a double pole switch would be required?

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nuckolls.bob(at)aeroelect
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Posted: Wed Jul 28, 2010 12:45 pm Post subject: E-Bus Off/On Indicator Light

At 10:51 AM 7/28/2010, you wrote:

 	  Quote: 	
		  

<gordonrsmith921(at)yahoo.com>



So if the power source for the LED came directly from a tap on the 

e-bus itself as you suggested as an alternate, in that case a double 

pole switch would be required?


	


   Not necessarily. But it does drive a requirement

   to evaluate unintended consequences (sneak path)

   for flow of current should one of the separate

   sources go to zero.



   What's the design goal for this light?

   Bob . . .

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gordonrsmith921@yahoo.com

Joined: 06 Oct 2009
Posts: 24

Posted: Thu Jul 29, 2010 3:58 am Post subject: Re: E-Bus Off/On Indicator Light

The design goal for this light:



This light is to be an indicator that the E-bus alternate feed switch is in the on position even though in most cases there would be other indications.



My thought go to shutting down and exiting the aircraft.  Although I would never do this some pilots have been known to leave the master on.  The LV warning light would be an indication that the master is on.



The exiting check list would be "All Lights Off!"



I am also considering the use of a Brownout Battery employed as in Z10-8.  I envision turning the E-bus alternate switch on to load flight plans, communicate, etc. before turning on the master and starting the engine.  The E-bus alternate feed would be left on during cranking to start in order for the anti-brownout feature to function.  The light would be a reminder to turn off the E-bus alternate feed switch after start.  Although, I guess it would not be a great sin if it were left on continuously during aircraft operation.



Gordon Smith

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nuckolls.bob(at)aeroelect
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Posted: Thu Jul 29, 2010 8:25 am Post subject: E-Bus Off/On Indicator Light

Design goals:



 This light is to be an indicator that the E-bus alternate feed switch is in the on position even 

 though in most cases there would be other indications.



 I am also considering the use of a Brownout Battery employed as in Z10-8.  I envision turning the 

 E-bus alternate switch on to load flight plans, communicate, etc. before turning on the master and 

 starting the engine.  The E-bus alternate feed would be left on during cranking to start in order 

 for the anti-brownout feature to function.  The light would be a reminder to turn off the E-bus 

 alternate feed switch after start.



     Okay, the idea is to annunciate a closed

     switch that controls a relay. The best

     way to do that is put the lamp across the

     coil of that relay.



 

 [img]cid:7.1.0.9.0.20100729112236.01ed1468(at)aeroelectric.com.0[/img] 



 



 

   Bob . . .

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dfritzj(at)yahoo.com
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Posted: Fri Jul 30, 2010 9:56 am Post subject: E-Bus Off/On Indicator Light

For what it's worth, I plan to put my nav/strobes (probably of the LED  

variety) on my E-bus as just such a reminder. Pretty hard to miss the  

strobes flashing as you give the plane a last look before walking away.



Dan

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