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Need advice on Z16 5amp circuit breaker

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Geoff Heap

Joined: 12 Jan 2006
Posts: 266
Location: Lindenwold, New Jersey

Posted: Wed Nov 18, 2009 10:20 am Post subject: Need advice on Z16 5amp circuit breaker

Ref Z16 schematic. There is a 5 amp circuit breaker on the wire from the main bus to the S700-2-10 Master. Can I use an in line 5 amp fuse. I would appreciate the advice. Thanks.....Geoff

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nuckolls.bob(at)aeroelect
Guest

Posted: Wed Nov 18, 2009 10:45 am Post subject: Need advice on Z16 5amp circuit breaker

At 12:20 PM 11/18/2009, you wrote:

 	  Quote: 	
		  



Ref Z16 schematic. There is a 5 amp circuit breaker on the wire from 

the main bus to the S700-2-10 Master. Can I use an in line 5 amp 

fuse. I would appreciate the advice. Thanks.....Geoff


	


   You're apparently unaware of why the breaker is even there . . .



   The Z-figures are intended to display various ARCHITECTURES,

   not recommended wiring diagrams and bills-of-materials. In

   the case of Z-16, it shows the use of fuseblocks in combination

   with a CROWBAR over voltage protection system. A panel re-setable

   breaker is one of the installation requirements for a crowbar

   ov protection system. So when combining with fuseblocks, the

   solitary breaker illustrated is part of the system integration

   task.



   Now, if your choice of power distribution protection is

   breakers instead of fuses then the 5A breaker would be

   right on the bus and labeled ALT FIELD. If you're

   going to use some form of field disconnect ov protection

   system, then yes, the 5A breaker could be a fuse . . . but

   not an in-line . . . it would be one of many fuses on the

   main bus.



   The simple answer to your question depends on the

   combination of components you're planning to use. In

   all cases, an in-line fuse is not a recommended

   substitute in any case. If you're using fuse blocks

   AND have crowbar ov protection, then you need the breaker

   as suggested.

        Bob . . .



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

        ( It's MATRONICS FUND RAISER MONTH!    )

        ( Do your part to keep this marvelous  )

        ( tool sharp and available to all our  )

        ( brothers in the OBAM aviation        )

        ( community.                           )

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

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mprather(at)spro.net
Guest

Posted: Wed Nov 18, 2009 11:18 am Post subject: Need advice on Z16 5amp circuit breaker

Bob,



Questions about the field breaker are a relatively common.  I know you

cover the reasoning for the breaker in the discussion about over voltage

protection but it seems there ends up being a disconnect when people look

at the Z diagrams.  I kind of suspect that many more people look at the Z

diagrams (seeking a wiring diagram/recipe) than read all parts of the

Aeroelectric connection book, so some  may miss the part about crowbars,

etc.  I see that you have a descriptive note (1 regarding the crowbar

module..



Maybe it would help people if there were an additional note next to the

field breaker that said something about this being part of the crowbar OV

circuit functionality - maybe refer to your discussion about controlling

alternators.  I realize you don't mind answering the same question

multiple times (in the interest of educating an ever changing classroom),

but this could be a place where a tiny amount of additional documentation

speeds the whole process.

Regards,



Matt-



 	  Quote: 	
		   

 <nuckolls.bob(at)aeroelectric.com>



 At 12:20 PM 11/18/2009, you wrote:

>

> <stol10(at)comcast.net>

>

>Ref Z16 schematic. There is a 5 amp circuit breaker on the wire from

>the main bus to the S700-2-10 Master. Can I use an in line 5 amp

>fuse. I would appreciate the advice. Thanks.....Geoff



    You're apparently unaware of why the breaker is even there . . .



    The Z-figures are intended to display various ARCHITECTURES,

    not recommended wiring diagrams and bills-of-materials. In

    the case of Z-16, it shows the use of fuseblocks in combination

    with a CROWBAR over voltage protection system. A panel re-setable

    breaker is one of the installation requirements for a crowbar

    ov protection system. So when combining with fuseblocks, the

    solitary breaker illustrated is part of the system integration

    task.



    Now, if your choice of power distribution protection is

    breakers instead of fuses then the 5A breaker would be

    right on the bus and labeled ALT FIELD. If you're

    going to use some form of field disconnect ov protection

    system, then yes, the 5A breaker could be a fuse . . . but

    not an in-line . . . it would be one of many fuses on the

    main bus.



    The simple answer to your question depends on the

    combination of components you're planning to use. In

    all cases, an in-line fuse is not a recommended

    substitute in any case. If you're using fuse blocks

    AND have crowbar ov protection, then you need the breaker

    as suggested.

         Bob . . .



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

         ( It's MATRONICS FUND RAISER MONTH!    )

         ( Do your part to keep this marvelous  )

         ( tool sharp and available to all our  )

         ( brothers in the OBAM aviation        )

         ( community.                           )

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

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Geoff Heap

Joined: 12 Jan 2006
Posts: 266
Location: Lindenwold, New Jersey

Posted: Wed Nov 18, 2009 11:39 am Post subject: Re: Need advice on Z16 5amp circuit breaker

Thanks for the info Bob. Correct. I did not know why it is there......Geoff

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