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Z13-8 how to energize standby contactor?

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scott(at)randolphs.net
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Posted: Tue Feb 14, 2006 3:48 pm Post subject: Z13-8 how to energize standby contactor?

I'm rebuilding the electrical system on my flying RV6a.  Conventional Mags

but all electric panel, so leaning strongly toward the Z-13/8 configuration.

I have developed several questions, but I'll send them individually to try

to keep the list archive most useable.



On the A13-8 diagram, it shows the Aux Alt "master" contractor energized

from the main battery side.  Is there any reason not to energize it from the

SD-8 alternator side?  My assumption is that the SD-8 will always generate a

voltage since it's got permanent magnets so it wouldn't need the battery to

energize the field before it was able to kick it's own relay on.  It should

be a fine point that wouldn't usually matter, but if somehow the main

battery went flat (I don't know, flying with the Nav lights on durring the

day and not noticing a failed main alt because the low volts light bulb was

burned out?) it seems like it'd be nice to be able to bootstrap the system

from the SD-8.



Thanks!



Scott.

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nuckollsr(at)cox.net
Guest

Posted: Thu Feb 23, 2006 8:21 am Post subject: Z13-8 how to energize standby contactor?

At 03:46 PM 2/14/2006 -0800, you wrote:



 	  Quote: 	
		  



I'm rebuilding the electrical system on my flying RV6a.  Conventional Mags

but all electric panel, so leaning strongly toward the Z-13/8 configuration.

I have developed several questions, but I'll send them individually to try

to keep the list archive most useable.



On the A13-8 diagram, it shows the Aux Alt "master" contractor energized

from the main battery side.  Is there any reason not to energize it from the

SD-8 alternator side?  My assumption is that the SD-8 will always generate a

voltage since it's got permanent magnets so it wouldn't need the battery to

energize the field before it was able to kick it's own relay on.  It should

be a fine point that wouldn't usually matter, but if somehow the main

battery went flat (I don't know, flying with the Nav lights on durring the

day and not noticing a failed main alt because the low volts light bulb was

burned out?) it seems like it'd be nice to be able to bootstrap the system

from the SD-8.


	


   Last I heard, the SD-8 still needs a battery to come on line.

   If you want something better, hammer on B&C about this. There's

   no good reason for this not to be a feature of the SD-8.



   Z-13 is a two layer system that will function in the bare minimum

   SD-8/Single battery system common to hundreds of Long and VariEz

   aircraft flying the SD-8. Closing the battery master adds a second

   layer with a main-bus.



   Even if the SD-8 came up without a battery, hooking as shown

   is recommended . . . let it bring the battery up a bit and it will

   then close the battery contactor. You don't want to close the battery

   contactor under SD-8 only ops until you have airport in sight and

   your asking whatever is left in the battery + SD-8 support to let

   you run more goodies in the approach to landing phase.



   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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