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Z-19 Clarifications

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mikefapex

Joined: 05 Jul 2007
Posts: 70
Location: Colorado

Posted: Tue Aug 21, 2007 7:18 pm Post subject: Z-19 Clarifications

Hi ,



I am planning to install a Z-19 system and had a couple of clarifying questions. Feedback is very much appreciated.



1. Do all of the contactors in the system have to be Amperage rated at or above the maximum output of the alternator? I guess this is not a z-19 specific question but I'm still unsure. 



2. How does the E-bus alternate feed relay work, I am not sure of its intended purpose? I can see the E-bus is normally fed from the Main power bus through a diode but I'm not sure what function the relay provides. 

Do you normally start with the E-bus relay switch OFF. Then if your alternator dies you manually switch the E-bus ON?



My E-bus load comes up to 9.5 amps. Do I even need the relay?



3. Should both batteries be connected to the same ground point on the airframe, rather than two separate locations?  In  my case it means running about 5' of wire to that designed ground stud. 



4. Parts - Diodes for the ECU and Fuel pumps - is the B&C Essential Bus Diode and the Perihelion Power-Deuce-Schottky™ Auto-Power Selector Diode Assembly essentially the same component.  In the Z-19 the it says 'Note 24', but I cannot find that in my Aeroelectric Connection manual or the website. 



Thanks very much,



Mike

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nuckollsr(at)cox.net
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Posted: Wed Aug 22, 2007 7:20 am Post subject: Z-19 Clarifications

At 08:18 PM 8/21/2007 -0700, you wrote:



 	  Quote: 	
		  



Hi ,



I am planning to install a Z-19 system and had a couple of clarifying 

questions. Feedback is very much appreciated.



1. Do all of the contactors in the system have to be Amperage rated at or 

above the maximum output of the alternator? I guess this is not a z-19 

specific question but I'm still unsure.


	


   Contactor "ratings" are much like switch ratings. Many

   times a device performs quite well even if it appears to

   be under-rated. For example, the S701-1 contactors offered

   by B&C as battery contactors are rated to switch 70A but will

   carry the starter current of several hundred amps when

   they're already closed and stable. Suggest you utilize

   the contactors recommended in the drawings and don't get

   wrapped around the axle on ratings.

 	  Quote: 	
		  2. How does the E-bus alternate feed relay work, I am not sure of its 

intended purpose? I can see the E-bus is normally fed from the Main power 

bus through a diode but I'm not sure what function the relay provides.


	


   Read chapter 17 in the book. A "lite" e-bus (7A or less) gets

   alternate power from the battery bus via direct wire and switch.

   Crash safety conventions dictate a "mini" battery contactor located

   at the battery bus for larger loads.



 	  Quote: 	
		  Do you normally start with the E-bus relay switch OFF. Then if your 

alternator dies you manually switch the E-bus ON?


	


   Yes and sorta yes. The main bus should also be shut down during

   alternator out operations to maximize endurance in the enroute

   phase of flight.



 	  Quote: 	
		  My E-bus load comes up to 9.5 amps. Do I even need the relay?


	


   See chapter 17.

 	  Quote: 	
		  3. Should both batteries be connected to the same ground point on the 

airframe, rather than two separate locations?  In  my case it means 

running about 5' of wire to that designed ground stud.


	


   What kind of airplane. See:



http://aeroelectric.com/articles/Battery_Grounds/Battery_Grounds.html

 	  Quote: 	
		  4. Parts - Diodes for the ECU and Fuel pumps - is the B&C Essential Bus 

Diode and the Perihelion Power-Deuce-Schottky™ Auto-Power Selector Diode 

Assembly essentially the same component.


	


    There are virtually thousands of diodes that will function

    as needed in this circuit. The parts offered by B&C and

    Perihelion are but two such devices cited for your convenience.



 	  Quote: 	
		     In the Z-19 the it says 'Note 24', but I cannot find that in my 

 Aeroelectric Connection manual or the website.


	


   Note 24 is on page Z-11 of

http://aeroelectric.com/articles/Rev11/AppZ_R11J.pdf





   Bob . . .

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mikefapex

Joined: 05 Jul 2007
Posts: 70
Location: Colorado

Posted: Wed Aug 22, 2007 11:11 am Post subject: Re: Z-19 Clarifications

Bob,



Thanks for your input. I found most of the answer per your referenced documents.



>> Contactor "ratings" are much like switch ratings. Many

times a device performs quite well even if it appears to

be under-rated. For example, the S701-1 contactors offered

by B&C as battery contactors are rated to switch 70A but will

carry the starter current of several hundred amps when

they're already closed and stable. Suggest you utilize

the contactors recommended in the drawings and don't get

wrapped around the axle on ratings. 

<<



Hmm, I think I see. If you start the aircraft with some initial load that is well below the 'rating' for the contactor, you could increase system load use to above those values (by some amount) since the contactors are already closed and flowing. 



My concern is that I am considering a fairly large alternator capable of 90+ amps. I know thats a lot but I am flying open cockpit in Colorado winter. The big load is the addition of heated motorcycle clothing for two people. I was also considering a Z-24 installation with an alternator cut-off contactor and wanted to understand alternator-output to contactor-rating concerns. 



Thanks again,



Mike

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