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Z-13/8 Bad if both alternators on at once?

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scott(at)randolphs.net
Guest

Posted: Tue Feb 14, 2006 4:03 pm Post subject: Z-13/8 Bad if both alternators on at once?

Would it be "bad" if the main alternator was still running and the standby

alternator were engaged?  My assumption is that which ever alternator's

regulator had the higher set point would max itself out (assuming a high

enough load) and the other alternator would pick up the rest (or idle) with

no ill effect on the system overall.  Is this true, or are there issues I'm

missing like dynamic circuit response causing some kind of feedback or the

smaller SD8 burning itself up?  A related question:  If the load is greater

than the SD-8 can support is there any consequence other than the battery

supplying the extra required current?  For instance if I flip on the battery

master and run landing lights or pitot heat or something.



Thanks again!

 

Scott.

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jon.goguen(at)umassmed.ed
Guest

Posted: Thu Feb 16, 2006 1:08 pm Post subject: Z-13/8 Bad if both alternators on at once?

Scott,



Unless special provisions are made, an over voltage condition on one 

alternator would trigger the over voltage protection on both.



Jon

Jon Goguen

jon.goguen(at)umassmed.edu

Central Massachusetts

Kitfox Series V Rotax 912S / N456JG (reserved)

Complete except for electrics and avionics



"Nothing worth knowing can be understood by the human mind"

--Woody Allen



On Feb 14, 2006, at 7:01 PM, Scott wrote:



 	  Quote: 	
		   



 Would it be "bad" if the main alternator was still running and the 

 standby

 alternator were engaged?  My assumption is that which ever alternator's

 regulator had the higher set point would max itself out (assuming a 

 high

 enough load) and the other alternator would pick up the rest (or idle) 

 with

 no ill effect on the system overall.  Is this true, or are there 

 issues I'm

 missing like dynamic circuit response causing some kind of feedback or 

 the

 smaller SD8 burning itself up?  A related question:  If the load is 

 greater

 than the SD-8 can support is there any consequence other than the 

 battery

 supplying the extra required current?  For instance if I flip on the 

 battery

 master and run landing lights or pitot heat or something.



 Thanks again!



 Scott.

- The Matronics AeroElectric-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?AeroElectric-List

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