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AEC Products - Future Z Revisions?

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gordonrsmith921(at)yahoo.
Guest

Posted: Thu Jul 02, 2009 11:51 am Post subject: AEC Products - Future Z Revisions?

Given:  

Electrically Dependent Engine  

Internally Regulated Alternator  

Z-19 + Z-24  

AEC 9005 Discontinued  

AEC 9004 & AEC 9011 to be available at a later date.  

Question:  

How to best accomplish OV/LV Control with Automatic Aux Battery Contactor Control?  

My thoughts:  

AEC 9011 doesn’t appear to have an output capable of the Aux Battery Contactor Automatic control, and therefore might not be appropriate in this example as an alternate replacement for the AEC 9005.  

It appears that the #1 terminal of the AEC 9004 might be used to not only control the Alternator OV Disconnect Contactor but also to offer automatic control of the Aux Battery Contactor.  

Or would something such as the LVWAABM by Eric Jones have to be employed in addition to the AEC 9004?  

Gordon Smith  

      [quote][b]

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nuckolls.bob(at)aeroelect
Guest

Posted: Thu Jul 02, 2009 2:01 pm Post subject: AEC Products - Future Z Revisions?

At 02:44 PM 7/2/2009, you wrote:

  	  Quote: 	
		   Given:

 Electrically Dependent Engine

 Internally Regulated Alternator

 Z-19 + Z-24

 AEC 9005 Discontinued

 AEC 9004 & AEC 9011 to be available at a later date.

 Question:

 How to best accomplish OV/LV Control with Automatic Aux Battery Contactor Control?

 My thoughts:

 AEC 9011 doesn’t appear to have an output capable of the Aux Battery Contactor Automatic control, and therefore might not be appropriate in this example as an alternate replacement for the AEC 9005. 	


   Yes it does and yes it COULD be used that way

   but . . .



  	  Quote: 	
		  It appears that the #1 terminal of the AEC 9004 might be used to not only control the Alternator OV Disconnect Contactor but also to offer automatic control of the Aux Battery Contactor. 	


   No, you don't want to mix these functions

   PARTICULARLY when they're managed by a common

   microcontroller. Independence and separation is

   a keystone for non-propagating, failure-tolerant

   design.



  	  Quote: 	
		  Or would something such as the LVWAABM by Eric Jones have to be employed in addition to the AEC 9004? 	


   Yes, any of the lv-warn, aux battery management

   products can be teamed with the ACE9004. Note that

   the AEC9011 monitors for lv conditions on both

   the main bus (+14v input terminal) and on any

   second input of your choice. In this case, I'd

   make it the aux battery bus. If you want to use

   BOTH batteries for cranking, then both battery

   switches are ON from start to finish in flight.



   If the aux battery is used to support electro-

   whizzies not designed to live in the world of

   GA aircraft the aux battery switch stays off

   until after the engine is started. Then, you are

   discouraged from leaving the aux battery switch

   OFF by a flashing light that reminds you that it

   is not being charged. The AEC9011 would not

   be used to manage b-lead disconnection. The

   AEC9004 has features that manage timing of

   the power to the b-lead contactor in addition

   to clamping off any resulting load-dump transient.

   This is orchestrated by software in a dedicated

   controller that is can be pre-flight testable.



   The AEC9011 gets preflight tested in that both

   LV lights flash on first power up and stop

   flashing as their respective watch-points rise

   above 13.0 volts. The AEC9011 used to manage

   an aux battery system would not offer an automatic

   contactor control pin, only a warning light.

   This lets you do the job with a less expensive

   switch that is either OFF or ON.



 

 

        Bob . . .



         ---------------------------------------

        ( . . .  a long habit of not thinking   )

        ( a thing wrong, gives it a superficial )

        ( appearance of being right . . .       )

        (                                       )

        (                  -Thomas Paine 1776-  )

         ---------------------------------------



     [quote][b]

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