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Z13-8 how to energize standby contactor?

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

Thanks!

Scott.


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nuckollsr(at)cox.net
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PostPosted: Thu Feb 23, 2006 8:21 am    Post subject: Z13-8 how to energize standby contactor? Reply with quote

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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