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Z-12, Z-13

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RV7ASask

Joined: 25 Jan 2006
Posts: 36

Posted: Sun Feb 28, 2010 10:28 am Post subject: Z-12, Z-13

Early on I decided to go with the Z-12 architecture but as my wiring came together I became more uncomfortable with it as I am going to be running dual Lightspeeds. 



The question kept coming up where should I wire the second ignition? The first one is directly on the Hot battery bus lead, i.e. straight to the battery. The second was planned on the E-Bus? 



Still not happy, I then decided to review the whole architecture and to change to Z-13/8. This has not been a big change other than I am running a B&C 20A Aux alternator.



The system is pretty well done and I do not have a relay in place for the E-Bus Alternate feed. 



I still have the 1-3 switch in place as per the Z-12 and have not added a fuselink to the E-Bus Alternate feed.

 

Do I need a relay? If so why? Do I need a fuse link when the alternate feed has a 7A fuse off the Bat Bus? Do I need a fuselink between the Aux Feed Current Limiter and the Bat Contactor?



Thanks



David Lamb

RV7A Still wiring

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nuckolls.bob(at)aeroelect
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Posted: Sun Feb 28, 2010 11:46 am Post subject: Z-12, Z-13

At 12:28 PM 2/28/2010, you wrote:

 	  Quote: 	
		  



Early on I decided to go with the Z-12 architecture but as my wiring 

came together I became more uncomfortable with it as I am going to 

be running dual Lightspeeds.



The question kept coming up where should I wire the second ignition? 

The first one is directly on the Hot battery bus lead, i.e. straight 

to the battery. The second was planned on the E-Bus?


	


   Or the main bus. Keep in mind that your engine runs perfectly

   well on one electronic ignition. During battery only ops, I'd

   turn one ignition off to reduce battery loads. In the event

   of a VERY rare, dual failure (lost #1 ignition too) then you

   can still close the battery contactor and deal with what is

   now a more critical situation than the original plan-b.

 	  Quote: 	
		  Still not happy, I then decided to review the whole architecture and 

to change to Z-13/8. This has not been a big change other than I am 

running a B&C 20A Aux alternator.



The system is pretty well done and I do not have a relay in place 

for the E-Bus Alternate feed.


	


   That relay is only suggested for e-bus loads larger than

   7A. But if you have a 20A s/b alternator, suggest you

   go with Z-12, put the #1 ignition on the battery bus,

   #2 ignition on the main bus. Odds are that you'll never

   have to configure for e-bus only ops.

 	  Quote: 	
		  I still have the 1-3 switch in place as per the Z-12 and have not 

added a fuselink to the E-Bus Alternate feed.


	


   Protecting the alternate feed wire is recommended whether

   you have the relay or not. The only decision is to size that

   protection commensurate with e-bus, battery only loads.

 	  Quote: 	
		  

Do I need a relay? If so why? Do I need a fuse link when the 

alternate feed has a 7A fuse off the Bat Bus? Do I need a fuselink 

between the Aux Feed Current Limiter and the Bat Contactor?


	


   Suggest you research the e-bus feeder discussions

   in Appendix Z notes and in the matronics archives.

   Suggest also that you publish your power distribution

   diagram that speaks to features of the /8 upsizing to

   20A.



   Bob . . .

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