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[Probable SPAM] Z-19 E Bus feeder questions - Fuse select

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nuckolls.bob(at)cox.net
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Posted: Thu Oct 11, 2007 5:12 am Post subject: [Probable SPAM] Z-19 E Bus feeder questions - Fuse select

At 02:15 PM 10/10/2007 -0400, you wrote:



 	  Quote: 	
		  



Mike,

         I'll wait for the Bob's definitive answer but this makes no

sense. That would be like adding a 100 am panel to your home and feeding

it off a 20 amp breaker in your main panel.



         The lead from the main power bus to the endurance bus should be

a direct feed from the same terminal as the main feed. Between them is a

diode to prevent backflow if the e-bus alternate is used.



         Also, I have an issue with the orphaned switch for fuel pump #2.

Why not integrate it with the engine primary and secondary switching?

Note that if fuel pump #1 makes trouble, this diagram provides no way to

isolate it, but rather one method to switch the bus that feeds it. With

switch #2 I can turn it off/on at will which is fine as a backup, but I

want that functionality for #1 also.


	


    Wondering what you're referring to here. The Z-19 as published

    was for a specific engine and fuel system that offered only

    1 ECU and 1 fuel pump. See:



http://www.aeroelectric.com/PPS/Adobe_Architecture_Pdfs/Z19M_1.pdf



http://www.aeroelectric.com/PPS/Adobe_Architecture_Pdfs/Z19M_2.pdf



    What's the "orphaned switch"?



    Bob . . .

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longg(at)pjm.com
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Posted: Thu Oct 11, 2007 9:53 am Post subject: [Probable SPAM] Z-19 E Bus feeder questions - Fuse select

Bob,

Re: orphaned switch. Well, not exactly orphaned, it just seems randomly

placed for my situation. Specifically I am applying this to a system

with one ECU and two fuel pumps.



I'm on board with expected loads for the ebus and the system routing

stuff. The primary power and secondary power are set. If we loose

primary power, we turn on secondary - no problem.



If pump #1 is burning (figuratively) up and we turn on #2 (already has a

power source), we still have power to pump #1. Ok, you know these

automotive jobs will die quickly with no fuel pump, so if pump #1 fails

we need to turn on pump #2. Not a problem, but there is some delay

there. A more robust way may might be to use a pressure switch to catch

#1 in the event of a failure and flip over to #2 auto-magically. 



Given all that I would like to isolate #1 should the above events occur.

I would like to add auto failover or at least have the ability to switch

each fuel pump on independent of each other regardless of their

relationship to primary or secondary power.



I agree with your thoughts on limiting the e-bus (in an emergency) to

bare bones equipment, however the diagram showing the primary feed as 7

amps would be inadequate for normal use even if I only used the com

(shown 7 amps). Ok, so all of this can vary - no problem.



I would probably have an issue if under emergency mode I forget to shut

down all but non-essential (probably dark, smoke or some other ugliness)

and flip on my little 10 amp eBus alternate only to find I've just blown

a fuse which I can't replace at the moment (busy flying). I believe I

can adjust that logic and the diagram to fit.



Perhaps select items like the MX20 and 530W should be split out onto

another bus to bring the total load down. My setup is a more complex IFR

support. Just more considerations.



There rest of the diagram looks solid (at least from my understanding).

One question? Do I need both the shunt and the ANL in front of the

alternator as shown? My Subaru has the built in regulator, but I would

still like to add an OV protection module.



Thanks



--

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