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

 
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scott(at)randolphs.net
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PostPosted: Tue Feb 14, 2006 4:03 pm    Post subject: Z-13/8 Bad if both alternators on at once? Reply with 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.


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jon.goguen(at)umassmed.ed
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PostPosted: Thu Feb 16, 2006 1:08 pm    Post subject: Z-13/8 Bad if both alternators on at once? Reply with quote

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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