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s.hamer(at)verizon.net
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Posted: Tue Feb 21, 2006 8:14 pm Post subject: Question for Bob or ?

I've wired up my RV-6 per figure Z-11 (mostly) and when I turn on the master switch, I'm seeing 11.5 volts on my voltage gauge.  If I add  the E-Bus switch it goes to 12.1.   With just the E-Bus switch on, my gauge shows zero volts.  I have an external shunt in the position as shown in figure Z-12, between the alternator and the starter contactor.  With the master switch off, I'm wondering how the gauge would get any juice? 

With this limited information, can anyone tell me where I messed up or is this what I should be seeing?  Just doesn't seem right.

Steve Hamer

Apple Valley, Ca.

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nuckollsr(at)cox.net
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Posted: Tue Feb 21, 2006 10:20 pm Post subject: Question for Bob or ?

At 08:10 PM 2/21/2006 -0800, you wrote:



 	  Quote: 	
		  



I've wired up my RV-6 per figure Z-11 (mostly) and when I turn on the 

master switch, I'm seeing 11.5 volts on my voltage gauge.


	


     Okay, that's about right for an e-bus driven voltmeter seeing hte main

     bus through the normal voltage drop in the bus isolation diode.



 	  Quote: 	
		     If I add  the E-Bus switch it goes to 12.1


	


     I would expect this . . . the switch is bypassing the diode

     and the voltage jumps up about .5 volts.

 	  Quote: 	
		      With just the E-Bus switch on, my gauge shows zero volts.  I have an 

 external shunt in the position as shown in figure Z-12, between the 

 alternator and the starter contactor.  With the master switch off, I'm 

 wondering how the gauge would get any juice?

With this limited information, can anyone tell me where I messed up or is 

this what I should be seeing?  Just doesn't seem right.


	


     You lost me. Z-11 suggests you wire the voltmeter to the e-bus

     and the voltages you cite agree with what I'd expect for voltage

     readings with the alternator off.



     The shunt is for the ammeter which never reads anything until

     the alternator is running and taking battery recharge and system

     loads. When you say "my gauge shows zero volts" are you meaning

     to say "zero amps"?  The ammeter will be zero until the engine

     is started and the alternator turned on.



     Bob . . .

      < What is so wonderful about scientific truth...is that >

      < the authority which determines whether there can be   >

      < debate or not does not reside in some fraternity of   >

      < scientists; nor is it divine. The authority rests     >

      < with experiment.                                      >

      <                            --Lawrence M. Krauss       >

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s.hamer(at)verizon.net
Guest

Posted: Wed Feb 22, 2006 6:58 am Post subject: Question for Bob or ?

Bob,



My voltmeter is powered by the -buss.  With just the e-bus switch on,  I'm 

reading zero volts and zero amps.  The gauge still has power to it at that 

time because the backlight is still on.



Steve

 	  Quote: 	
		  

     You lost me. Z-11 suggests you wire the voltmeter to the e-bus

     and the voltages you cite agree with what I'd expect for voltage

     readings with the alternator off.



     The shunt is for the ammeter which never reads anything until

     the alternator is running and taking battery recharge and system

     loads. When you say "my gauge shows zero volts" are you meaning

     to say "zero amps"?  The ammeter will be zero until the engine

     is started and the alternator turned on.



     Bob . . .

      < What is so wonderful about scientific truth...is that >

      < the authority which determines whether there can be   >

      < debate or not does not reside in some fraternity of   >

      < scientists; nor is it divine. The authority rests     >

      < with experiment.                                      >

      <                            --Lawrence M. Krauss       >

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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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