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Misprint in Z-16, v.12/ OV with Rotax generators?

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uuccio(at)gmail.com
Guest

Posted: Sat Sep 22, 2012 1:53 pm Post subject: Misprint in Z-16, v.12/ OV with Rotax generators?

Hello listers,



Seems like there is a small misprint in Z16 v.12: the wire between the 5A breaker (or is it a fuse?) and the S1 switch should be 18AWG not 22AWG since its the same size as the fuse link.



I was chatting to my favorite automotive mechanic the other day and telling him I was planning to include an alternator disconnect relay (as per Z16 or maybe Z17) in my electrical system.  He said that he's never heard of a Ducati regulator going in over voltage, he says they usually just  stop working.  Does anyone know of anyone who's experienced an OV problem with the inbuilt Rotax generator? 



Another question: can anyone explain why the alternator disconnect wiring is more complex in Z16 than in Z17?  What is the advantage of doing it the Z16 way? 



Sacha

Rebuilding a Kitfox IV with Rotax 80hp, almost there

Sicily, Italy

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Bob McC

Joined: 09 Jan 2006
Posts: 258
Location: Toronto, ON

Posted: Sat Sep 22, 2012 2:52 pm Post subject: Misprint in Z-16, v.12/ OV with Rotax generators?

Actually the 22ga wire is perfectly adequate to trip the 5A breaker. The

purpose of the fuse link is to protect the 18ga wire between the buss and

the breaker should it inadvertently short to ground. So the drawing is

correct as shown. 

The "normal" failure might be to "stop working" i.e. shut down, but what

about the case of the one in a million "abnormal" failure where an OV

occurs?? Not familiar with it happening, but it might, it is electronics

after all ?



Bob McC



[quote] --

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_________________
Bob McC
Falco #908
(just starting)

uuccio(at)gmail.com
Guest

Posted: Sat Sep 22, 2012 8:20 pm Post subject: Misprint in Z-16, v.12/ OV with Rotax generators?

Thanks Bob, 

I almost didn't mention it as I thought it was "obviously wrongh but now I'm glad I did as I learnt something!  (Is there a detailed discussion of how each Z figure works somewhere that beginners can read?). Still wondering about the diff between the Z16 and Z17 alternator disconnect wiring. 



On 23/set/2012, at 00:50, Bob McCallum <robert.mccallum2(at)sympatico.ca> wrote:



[quote] 

 

 Actually the 22ga wire is perfectly adequate to trip the 5A breaker. The

 purpose of the fuse link is to protect the 18ga wire between the buss and

 the breaker should it inadvertently short to ground. So the drawing is

 correct as shown. 

 The "normal" failure might be to "stop working" i.e. shut down, but what

 about the case of the one in a million "abnormal" failure where an OV

 occurs?? Not familiar with it happening, but it might, it is electronics

 after all ?

 

 Bob McC

 

> --

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klehman(at)albedo.net
Guest

Posted: Sun Sep 23, 2012 6:07 am Post subject: Misprint in Z-16, v.12/ OV with Rotax generators?

Not Ducati but I had a similar John Deere regulator for a 20 amp 

permanent magnet alternator fail full on.

My fault as I started the engine with a dead battery. The voltage went 

high as the dead battery was not immediately ready to accept current 

which is not unusual for a fully discharged AGM battery. The regulator 

failed and thereafter let unregulated full alternator output through. 

The regulator failed even though the overvoltage disconnect relay was 

between the alternator and the regulator so the voltage must have risen 

faster than the relay could open when the engine started. I credit Bob's 

crowbar ovm for keeping the buss voltage clamped though and preventing 

any further damage.



I guess the main point is that sometimes solid state devices can indeed 

fail ON instead of OFF.



Ken



On 22/09/2012 5:52 PM, s wrote:

 	  Quote: 	
		   



 Hello listers,



 Seems like there is a small misprint in Z16 v.12: the wire between

 the 5A breaker (or is it a fuse?) and the S1 switch should be 18AWG

 not 22AWG since its the same size as the fuse link.



 I was chatting to my favorite automotive mechanic the other day and

 telling him I was planning to include an alternator disconnect relay

 (as per Z16 or maybe Z17) in my electrical system.  He said that he's

 never heard of a Ducati regulator going in over voltage, he says they

 usually just  stop working.  Does anyone know of anyone who's

 experienced an OV problem with the inbuilt Rotax generator?



 Another question: can anyone explain why the alternator disconnect

 wiring is more complex in Z16 than in Z17?  What is the advantage of

 doing it the Z16 way?



 Sacha Rebuilding a Kitfox IV with Rotax 80hp, almost there Sicily,

 Italy

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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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