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Z-13 and SD-8

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l.p(at)talk21.com
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Posted: Mon Nov 10, 2008 3:05 am Post subject: Z-13 and SD-8

Bob.

 >     If the  rectifier/regulator were inadequately heat-sinked, it could have caused  internal damage at some point in the flight.That's about the only part of the  SD-8 system that's vulnerable. 

 My system uses the stainless steel firewall as a  heat sink... is that sufficient? Do I need conductive paste(?) between it and  the firewall? Any other suggestions?

  

 >     Check  with a voltmeter that you have AC voltage coming in while the engine is  running and that the  disconnect relay is closing.

  

 So far have only checked the disconnect relay is working  ok, it is, and the DC output at the relay. This varied from 12.9 to 12.3  volts depending on load. Are these the figures you'd expect? 

 I can't seem to find what the SD-8s dc output should  be on any website pages! I'd have hoped/thought it would be similar to the  main alternators approx 14.7v, is this correct?

  

 Would my results indicate a regulator fault, or should I  still check the ac output?

  

 Any help much appreciated.

 Kind regards

 Patrick C Elliott, Reigate, Surrey, England. G-LGEZ  

   [quote][b]

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nuckolls.bob(at)cox.net
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Posted: Mon Nov 10, 2008 10:43 am Post subject: Z-13 and SD-8

At 10:35 AM 11/10/2008 +0000, you wrote:

 	  Quote: 	
		  Bob.

 >     If the rectifier/regulator were inadequately heat-sinked, it could 

 have caused internal damage at some point in the flight.That's about the 

 only part of the SD-8 system that's vulnerable.

My system uses the stainless steel firewall as a heat sink... is that 

sufficient? Do I need conductive paste(?) between it and the firewall? Any 

other suggestions?

 >     Check with a voltmeter that you have AC voltage coming in while the 

 engine is running and that the disconnect relay is closing.

So far have only checked the disconnect relay is working ok, it is, and 

the DC output at the relay. This varied from 12.9 to 12.3 volts depending 

on load. Are these the figures you'd expect?

I can't seem to find what the SD-8s dc output should be on any website 

pages! I'd have hoped/thought it would be similar to the main alternators 

approx 14.7v, is this correct?

Would my results indicate a regulator fault, or should I still check the 

ac output?

  That's where you need to begin. If there's no power input

  to the rectifier/regulator, then there can be no output.

  Yes, the output voltage should be on the order of 14.2 to

  14.8 volts. The engine RPM will have to be much higher than

  ground idle before the alternator comes on line.

  Bob . . .

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