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Newbie with PM alternator feed question

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blues750

Joined: 06 Jun 2015
Posts: 56

Posted: Thu Jun 11, 2015 10:37 am Post subject: Newbie with PM alternator feed question

Running a UL Power engine with 30A PM alternator with external R/R.  Excess voltage dumped to ground via the thyristors as waste/heat.



My question - if the thyristors fail and I have an over voltage condition, what is the recommended design way to disconnect/interrupt alternator output to the batteries or primary and secondary busses?  Switch, switch/relay combo,  I do need energy to the busses from the battery to run the ECU's and fuel pumps to keep the engine running.   Specifics and general discussion appreciated.



Thanks



Dave

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nuckolls.bob(at)aeroelect
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Posted: Thu Jun 11, 2015 12:40 pm Post subject: Newbie with PM alternator feed question

At 01:37 PM 6/11/2015, you wrote:

  	  Quote: 	
		  --> AeroElectric-List message posted by: "blues750" <den_beaulieu(at)yahoo.com>



 Running a UL Power engine with 30A PM alternator with external R/R.  Excess voltage dumped to ground via the thyristors as waste/heat. 	


   This class of rectifier/regulator has never been

   used in this class of alternator . . . and fell

   from favor in small engine bikes and scooters 

   years ago.  They have been SERIES switched,

   rectifier/regulators for decades.



  	  Quote: 	
		  My question - if the thyristors fail and I have an over voltage condition, what is the recommended design way to disconnect/interrupt alternator output to the batteries or primary and secondary busses?  Switch, switch/relay combo,  I do need energy to the busses from the battery to run the ECU's and fuel pumps to keep the engine running.   Specifics and general discussion appreciated. 	


   See:



  http://tinyurl.com/7vp9g4e



   . . . for an exemplar methodology for disconnecting

   the a/c output of the PM alternator from the R/R

   during normal alternator shut-down and/or forced

   shutdown after an OV event.



 

   Bob . . .    [quote][b]

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blues750

Joined: 06 Jun 2015
Posts: 56

Posted: Thu Jun 11, 2015 2:26 pm Post subject: Re: Newbie with PM alternator feed question

Thanks Bob...more confused and curious now.



The system is described as a permanent magnet 3-phase alternator with a simple and reliable shunt type of regulator with fail safe characteristics.  They further state "the thyristors in the shunt regulator actually short the generator windings to ground (dump the load) in a pulsating like fashion..."



What class of of R/R and Alternator do I have?  Or, better yet, what is the accurate way to refer to my system. 



Not sure what a series switched R/R is with respect to my system.  Should I consider changing out my R/R for any reason?



Trying to determine how to best (if required) implement a disconnect of some sort in the event an over voltage condition occurs.



Trying to sort things out as I proceed and appreciate this forum and your literature!



Dave

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