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Fuselink for battery master/ alt field

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will(at)willcrook.com
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Posted: Tue May 01, 2007 5:07 pm Post subject: Fuselink for battery master/ alt field

'Lectric Listers:

  

 I had to fun of attending Bob's seminar recently in Winterville, NC. Great time, I learned a tremendous amount.

  

 My wiring is pretty much straight Z-11, except I am using Plane Power's internally regulated alternator.

  

 The diagram shows a 22AWG fuselink off the main buss lead powering the alternater field through the batt/alt master swith (Z-11). The alt field is further protected with a 5A pullable breaker between the switch and the alternator.  The note I scribbled down is that the fuselink is there in addition to the CB to allow the Plane Power's crowbar protection module to do its job (which, as I understand it, is to cause an instant ground fault upon overvoltage, thereby forcing the breaker to trip).  I suppose the fuselink also protects the wire between the main buss and the switch.

  

 I asked the guys at Plane Power's booth at SNF to explain further, but they felt that the fuselink was not necessary.

  

 Standing by for my lesson.  Thanks,

  

 Will

 Glastar

 Waynesville, NC

  

 (PS: Bob:  any progress on the pitot tube connector?)

  

  



 [quote][b]

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nuckollsr(at)cox.net
Guest

Posted: Mon May 07, 2007 6:32 pm Post subject: Fuselink for battery master/ alt field

At 06:03 PM 5/1/2007 -0700, you wrote:



 	  Quote: 	
		  'Lectric Listers:



I had to fun of attending Bob's seminar recently in Winterville, NC. Great 

time, I learned a tremendous amount.



My wiring is pretty much straight Z-11, except I am using Plane Power's 

internally regulated alternator.



The diagram shows a 22AWG fuselink off the main buss lead powering the 

alternater field through the batt/alt master swith (Z-11). The alt field 

is further protected with a 5A pullable breaker between the switch and the 

alternator.  The note I scribbled down is that the fuselink is there in 

addition to the CB to allow the Plane Power's crowbar protection module to 

do its job (which, as I understand it, is to cause an instant ground fault 

upon overvoltage, thereby forcing the breaker to trip).  I suppose the 

fuselink also protects the wire between the main buss and the switch.



I asked the guys at Plane Power's booth at SNF to explain further, but 

they felt that the fuselink was not necessary.



Standing by for my lesson.  Thanks,


	




Any time you hook a small (read easily smoked) wire to a bus (read

many hundreds of amps of potential fault current) you provide a means

by which that run of wire is protected. Since we need a 5A breaker to

support design goals for the crowbar OV protection system, then the

breaker will be remotely mounted from the fuse bus and the chunk of

wire between the bus and the breaker falls into the category cited

above. It takes a HUSKY fuse to stay close during the faulting of

a 5A breaker . . . hence the fusible link which is indeed in the

"husky" class of circuit protection like it's giant cousins, the

ANL current limiters.



Bob . . .

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