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Z-19 questions (Expanded)

 
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nuckollsr(at)cox.net
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PostPosted: Sat Mar 18, 2006 9:48 am    Post subject: Z-19 questions (Expanded) Reply with quote

Sorry, I didn't accurately interpret your question (3).
For a single device and two power sources, you might
consider two single pole switches (1-3) from each battery
bus coming together at an isolation diode. It's LIKE that
scheme shown in Z-19 for handling single pump and a single
ECU through two pole switches. Since you have only one
accessory, single pole switches and only one diode array
are needed.

At 11:34 AM 3/17/2006 -0800, you wrote:

Quote:


1. Why is there a 7A fuse between the main power distribution bus and the
E-bus? The loads on the E bus are all fused.

Fuses protect wires. FAA rule of thumb is any wire over 6" is
a candidate for protection. 7A fuse and 16AWG wire sizing
(as are all other fuses and wires) are subject to adjustment
in accordance with appliance choices and bus loadings unique
to your airplane.

Keep in mind that the z-figures are ARCHITECTURE drawings,
they are not instructions on how to wire your airplane.

Quote:
2. The schematic shows alternate feeds for an ECU and fuel pump. I will
have dual Light speed ignition, dual fuel pumps, and one EFI. To
accomodate this, do I tap into the upstream legs supplying the dual diode
feeds and add another dual diode feed, each, for the 2nd pump and ignition?

Stand-alone, dual accessories like ign and fuel pumps
get independent protected (fused) supplies through independent
switches. Only single, critical accessories like your
EFI will benefit from the diode isolated, multiple
feed path illustrated.
Quote:
3. I want to have a dual feed, from Main & Engine batt. buses, w/circuit
breaker to the EFI. Any elegant ideas to do this?

Just like Z-19 shows for engine primary switch. Why circuit breakers?
Quote:
4. The E bus has an alternate feed path off the Main batt bus. Is it
overkill to have a feed path from the Engine batt bus?

Depends on how much "killing" you want to do. We generally
draw the line at accommodating single failures for any given
flight. If you feel better about stacking lots of failures
up and devising a means for dealing with all of them, then
whatever additional alternate operating schemes you wish
to devise are in order.
Quote:
5. What is the "Auto" function of the Eng/Bat/Auto switch?


See http://aeroelectric.com/Catalog/AEC/9005/9005-701B.pdf

Quote:
6. The fuse for the voltmeter is 1A at the Main Batt bus and 3A at the Eng
Batt bus. Is this a typo or is there a reason for the difference?

No reason whatsoever. See item (1) above. Make the fuses/wires
match what YOUR airplane needs.

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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