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Z-25 (Self-excitation) Question

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jgswartout(at)earthlink.n
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Posted: Wed Feb 06, 2008 8:25 pm Post subject: Z-25 (Self-excitation) Question

If the self-excitation feature (Figure Z-25) for the SD-8 means that the SD-8 is "on" whenever the engine is running, what purpose does the Aux Alt Off/On switch serve?  Further, would that switch have to be "On" in order for the crowbar over voltage module to be able to function?

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jgswartout(at)earthlink.n
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Posted: Wed Feb 06, 2008 8:55 pm Post subject: Z-25 (Self-excitation) Question

One more thing...



In Z-25 and in Z-13/8, it appears to me that if the Aux Alt switch is "On," an over-voltage event--whether caused by the main alternator or the auxiliary alternator--could cause either the main crowbar or the aux crowbar--or both--to trip, and you wouldn't necessarily know which was the offending alternator.  If both crowbars tripped, you would be on the battery until you reset one of the circuit breakers--the correct one.  Is this correct?

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nuckolls.bob(at)cox.net
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Posted: Thu Feb 07, 2008 4:41 am Post subject: Z-25 (Self-excitation) Question

At 11:49 PM 2/6/2008 -0500, you wrote:



 	  Quote: 	
		  

<jgswartout(at)earthlink.net>



One more thing...



In Z-25 and in Z-13/8, it appears to me that if the Aux Alt switch is 

"On," an over-voltage event--whether caused by the main alternator or the 

auxiliary alternator--could cause either the main crowbar or the aux 

crowbar--or both--to trip, and you wouldn't necessarily know which was the 

offending alternator.  If both crowbars tripped, you would be on the 

battery until you reset one of the circuit breakers--the correct one.  Is 

this correct?


	


   No, the SD-8 is not intended to be run in conjunction

   with the main alternator. You turn it on only after

   the main alternator has been shown unusable for any

   reason, including an OV trip.



   Bob . . .

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