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Z-12 Architecture - Parallel Master Contactors

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rckol

Joined: 14 Nov 2008
Posts: 36

Posted: Fri Feb 26, 2010 8:23 pm Post subject: Z-12 Architecture - Parallel Master Contactors

In "A Short Discussion of the Endurance Bus" on page Z-2 of Rev 12A of The AeroElectric Connection it states that "Unless you're planning TWO alternators (Z-12, Z-13 or Z-14) then the purpose of the e-bus is to provide a minimum consumption mode of operation in a battery only condition..."



Z-14 has no ebus



In Z-13, the ebus is tied to the output of the 8 AMP alternator and it functions to limit the load on the alternator (as plan B) but also provides for a battery only mode (Plan C) in the event of an unlikely simultaneous failure of both alternator systems.



In Z-12, it seems the function of the e-bus is a battery only mode of operation for either either of the following:



  a. A Plan B in the event that an open master contactor failure renders both alternators unusable or

  b. A Plan C in the event of an unlikely failure of both alternator systems for other reasons on the same tank of fuel.



For Z-12, if instead of an e-bus, a parallel master contactor was provided:

  a. Plan B in the case of an open master contactor would be to close the parallel contactor resulting in a fully functioning alternator(s) and 

  b.  Plan C would be unchanged.  



The cost and complexity of an extra contactor compared to an e-bus would seem to be about a wash.



What would be the downside other than the need to thoughtfully manage the electrical loads in Plan C?

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rck

user9253

Joined: 28 Mar 2008
Posts: 1921
Location: Riley TWP Michigan

Posted: Sat Feb 27, 2010 8:55 am Post subject: Re: Z-12 Architecture - Parallel Master Contactors

Re: A second parallel battery contactor in lieu of an E-Bus.



The cost of the E-Bus and diode and switch and relay are relatively inexpensive and weigh less than a second contactor and associated heavy wire.  When I am faced with a decision, I ask myself, "What is best in the long run?" 

   Your proposal is feasible for a backup in case of contactor failure in Z-12 (two alternators).  I do not see any safety issues.  You have double the chance of leaving the master switch on.  

Joe

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Joe Gores

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