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Alternators - To Fuse or not to fuse - That IS the questio

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nuckolls.bob(at)aeroelect
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Posted: Mon Aug 14, 2017 9:30 am Post subject: Alternators - To Fuse or not to fuse - That IS the questio

At 10:00 AM 8/13/2017, you wrote:

  	  Quote: 	
		  --> AeroElectric-List message posted by: "kearney" <kearney(at)shaw.ca>



 Charlie



 Your comment on the OV nuisance trip is interesting. How does one tell if the OV was a temporary, non-threatening excursion or if it is the result of something serious? Resetting the breaker seems risky. 	


   If there's a real trip of the ov protection system

   then resetting one time does not represent a big

   risk . . . the ov excursion is well under DO160

   limits.



 

  	  Quote: 	
		  Dave's comment about being able to isolate the field field when ship's power is on without the engine makes sense. In that case I wounder if a switch and a fuse would be better. Pulling breakers seems a bit kludgy. 	


   The z-figures have offered TWO approaches to dC

   POWER master switches. 



   One with the three position master where mid position

   is battery only, up position is battery+altenrator 



 [img]cid:7.1.0.9.0.20170814122057.0708bde0(at)aeroelectric.com.0[/img] 



 

   In this case, battery only ops are easily

   established with just the switch.



   In the past, we've shown that DC PWR MASTER

   could be a simple DPST toggle that brings

   battery and alternator on together. In

   this case, having a field breaker rather

   than fuse made it possible to set up

   battery only maintenance ops on the ground.



   OF course, if the ship was fitted with crowbar

   ov protection, then the breaker was already

   in place.



 



 

   Bob . . .

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kearney

Joined: 20 Sep 2008
Posts: 563

Posted: Tue Aug 15, 2017 6:03 pm Post subject: Re: Alternators - To Fuse or not to fuse - That IS the que

Hi Bob



Thank you for the helpful comments. I will likely go with a battery bus and CBs on the Alternator fields. As I also plan to use the B&C volt regulators shown in the Z12, I will also have the requisite OV protection.



Cheers



Les

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