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klixon cb

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rogsherriff(at)hotmail.co
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Posted: Thu Jun 08, 2017 12:20 pm Post subject: klixon cb

I notice that the top terminal on the klixon circuit breakers is marked "line." Does it matter on which terminal the bus or the LRU go?  



  

Thanks, 



  

Roger.

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nuckolls.bob(at)aeroelect
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Posted: Thu Jun 08, 2017 3:34 pm Post subject: klixon cb

At 03:19 PM 6/8/2017, you wrote:



  	  Quote: 	
		  I notice that the top terminal on the klixon circuit breakers is marked "line." Does it matter on which terminal the bus or the LRU go? 



 	


   No.



 

   Bob . . .

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alec(at)alecmyers.com
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Posted: Thu Jun 08, 2017 4:35 pm Post subject: klixon cb

I just had an issue with recharging a flat aircraft battery by running the engine after a hand start. Not enough residual battery juice to close the main contactor, so no current flowing from the alternator to the battery.

Come to think of it it might be a generator instead of an alternator because even without a power source for excitation the bus was powering the aircraft radio. Still, no current going to the battery with the contactor resolutely open.

Is this a really obvious well known phenomenon that I've never really thought about before?





On Jun 8, 2017, at 16:19, Roger Sherriff <rogsherriff(at)hotmail.com (rogsherriff(at)hotmail.com)> wrote:

       

I notice that the top terminal on the klixon circuit breakers is marked "line." Does it matter on which terminal the bus or the LRU go?  



  

Thanks, 



  

Roger.

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nuckolls.bob(at)aeroelect
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Posted: Thu Jun 08, 2017 6:56 pm Post subject: klixon cb

At 07:33 PM 6/8/2017, you wrote:

  	  Quote: 	
		  I just had an issue with recharging a flat aircraft battery by running the engine after a hand start. Not enough residual battery juice to close the main contactor, so no current flowing from the alternator to the battery.



 Come to think of it it might be a generator instead of an alternator because even without a power source for excitation the bus was powering the aircraft radio. Still, no current going to the battery with the contactor resolutely open.



 Is this a really obvious well known phenomenon that I've never really thought about before? 	


   Waaayyy back in the dark ages . . . but after Lucky Lindy,

   only generators were considered to be 'self exciting' but

   then only if the field was 'flashed' so as to possess some

   residual magnetism. Alternators too had some non-zero

   retentivity but generally too low to bring an alternator

   on line at ordinary speeds.



   There WERE notable exceptions. Alternators on the Bonanzas

   and Barons were expected to self excite at cruise rpms . . .

   and most did . . . but that's an interesting story for another

   time.



   Today's alternators, PARTICULARLY those that run nearly 10k

   rpm on the front of a Lycoming will come on line self excited

   if lightly loaded . . . and will run well. So your observation

   may not be a strange as you would think.



   Having said that, it's generally a poor idea to recharge

   a flat battery with the ship's alternator . . . use 

   jumper cables to an automobile for a few minutes to stir

   up the battery's chemistry and avoid unpredictable 

   perturbations of bus voltage during early phase of

   recharge . . . and know this is not very good for

   the battery's service life.  Putting a regulated, 10A

   charger on it for an hour or so is much preferred.  



 

 

   Bob . . .

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