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Crowbar with Dynamos Z-16

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khurst(at)taroom.qld.gov.
Guest

Posted: Sat Jul 29, 2006 11:36 pm Post subject: Crowbar with Dynamos Z-16

Bob,



I understand how there is no external control over a dynamo like there

is with an externally regulated alternator.



However, on studying the Z16 diagram (Rotax), I am wondering if there is

any reason why the common and NO contacts of the S704-1 Alternator OV

disconnect relay cannot be placed in series with one of the yellow

output wires of the dynamo.



I know you have been there before but on the Ducati regulator, the

following words are cast "with motor running never detach battery

cables" 



Because I don't understand things well enough, I feel somewhat uneasy

going against the recommendation of the manufacturer and after having

another look at the circuit today, I couldn't help but wonder why we

cannot take the dynamo off line by breaking one of its leads.



I realise that in the event of a REAL OV event, the regulator is stuffed

anyway but in the case of a nuisance trip of the crowbar . . . .



Your comments would be most appreciated please, I'm to the point where I

now HAVE to make a decision.



Kingsley in Oz

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n821x(at)yahoo.com
Guest

Posted: Sun Jul 30, 2006 3:16 pm Post subject: Crowbar with Dynamos Z-16

   I am also interested in the reply to this question. I have a Rotax 912 with Ducati regulator with over 200 hours on it. It is wired per figure Z-7 which was the latest

  schematic for Rotax installations back in 1998. 

     

      The latest figure Z-16 Does have one of the Yellow wires from the Generator wired in series with the Common and N.O. terminals of the relay?

   

    Mike , Yuba City,CA



Kingsley Hurst <khurst(at)taroom.qld.gov.au> wrote:

  [quote]--> AeroElectric-List message posted by: "Kingsley Hurst" 



Bob,



I understand how there is no external control over a dynamo like there

is with an externally regulated alternator.



However, on studying the Z16 diagram (Rotax), I am wondering if  there is

any reason why the common and NO contacts of the S704-1 Alternator OV

disconnect relay cannot be placed in series with one of the yellow

output wires of the dynamo.



I know you have been there before but on the Ducati regulator, the

following words are cast "with motor running never detach battery

cables" 



Because I don't understand things well enough, I feel somewhat uneasy

going against the recommendation of the manufacturer and after having

another look at the circuit today, I couldn't help but wonder why we

cannot take the dynamo off line by breaking one of its leads.



I realise that in the event of a REAL OV event, the regulator is stuffed

anyway but in the case of a nuisance trip of the crowbar . . . .



Your comments would be most appreciated please, I'm to the point where I

now HAVE to make a decision.



Kingsley in

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klehman(at)albedo.net
Guest

Posted: Sun Jul 30, 2006 5:55 pm Post subject: Crowbar with Dynamos Z-16

Hi Kingsley

FWIW I have done that with a 40 amp OV relay in series with the output 

of a 20 amp John Deere dynamo (permanent magnet alternator). I reasoned 

that a false trip was less likely to damage anything that way and also 

that it provided a way of disconnecting the current to the regulator in 

the event of a regulater problem/overheat. I did have some trips with 

the old version of the homemade OVP circuit during starts with no harm 

done.  However with the latest version of the homemade OVP circuit I 

haven't had a trip in ground testing or 25 flight hours.

Ken



Kingsley Hurst wrote:



 	  Quote: 	
		  



Bob,



I understand how there is no external control over a dynamo like there

is with an externally regulated alternator.



However, on studying the Z16 diagram (Rotax), I am wondering if there is

any reason why the common and NO contacts of the S704-1 Alternator OV

disconnect relay cannot be placed in series with one of the yellow

output wires of the dynamo.



I know you have been there before but on the Ducati regulator, the

following words are cast "with motor running never detach battery

cables" 



Because I don't understand things well enough, I feel somewhat uneasy

going against the recommendation of the manufacturer and after having

another look at the circuit today, I couldn't help but wonder why we

cannot take the dynamo off line by breaking one of its leads.



I realise that in the event of a REAL OV event, the regulator is stuffed

anyway but in the case of a nuisance trip of the crowbar . . . .



Your comments would be most appreciated please, I'm to the point where I

now HAVE to make a decision.



Kingsley in Oz

- 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:

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khurst(at)taroom.qld.gov.
Guest

Posted: Sun Jul 30, 2006 9:03 pm Post subject: Crowbar with Dynamos Z-16

Michael,

  

 Many thanks for directing me to the new Z16 drawing.  After some  experimentation, I found the version to which you refer.  It appears that  on Bob's site, it depends on what route one takes as to what version one  gets.  For example, if you click on the following link, you will still  get the old version.

  

 http://www.aeroelectric.com/PPS/Adobe_Architecture_Pdf/Z16K.pdf

  

 I'm very pleased to know that this method can be used so thank you once  again for your help.

  

 Regards

 Kingsley

 Taroom Qld Aust

  

 do not archive

 [quote]   

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khurst(at)taroom.qld.gov.
Guest

Posted: Sun Jul 30, 2006 11:41 pm Post subject: Crowbar with Dynamos Z-16

Ken,



 	  Quote: 	
		   I reasoned that a false trip was less likely to damage anything


	


Exactly what I was thinking too.



 	  Quote: 	
		   I did have some trips with the old version of the homemade OVP circuit

during starts with no harm done.
	




Also exactly what I was hoping to hear.



Your response much appreciated thanks mate.



Kingsley

Taroom Qld Aust

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