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Switchology Question

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logansc

Joined: 07 Dec 2009
Posts: 2

Posted: Mon Dec 07, 2009 11:40 am Post subject: Switchology Question

Guys: I have a newly finished Rocket, wired IAW Z13-8.  My system has a big battery, a 60 amp alternator (Plane Power) and an SD-8 backup.  I have not tested the SD-8 yet and was wondering if there is a protocol for that, that I should observe.



I have a three position main DC Master switch (off, Batt, on) and no avionics master (I prefer turning each on and off individually).  I also have separate E-bus Alt Feed and Aux Alternator on-off switches.  I plan to test my SD-8 on the ground with all my avionics off except my engine monitor (which has my volt and ammeters) to see if it is wired correctly and shows Aux Alternator output.  Should I start on the main system, turn on the engine monitor, and then switch the main to Batt, and then the E-bus on, and then the Aux Alt on, and then the Batt off?  



If that is all correct, then airborne if I lose or shut down the main alternator, is the sequence the same?  Haven't got the diagrams with me at the moment and I'm trying to write a procedure.  Any help would be appreciated.



Thanks,



Lee...

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nuckolls.bob(at)aeroelect
Guest

Posted: Mon Dec 07, 2009 6:44 pm Post subject: Switchology Question

At 01:40 PM 12/7/2009, you wrote:

 	  Quote: 	
		  



Guys: I have a newly finished Rocket, wired IAW Z13-8.  My system 

has a big battery, a 60 amp alternator (Plane Power) and an SD-8 

backup.  I have not tested the SD-8 yet and was wondering if there 

is a protocol for that, that I should observe.



I have a three position main DC Master switch (off, Batt, on) and no 

avionics master (I prefer turning each on and off individually).  I 

also have separate E-bus Alt Feed and Aux Alternator on-off 

switches.  I plan to test my SD-8 on the ground with all my avionics 

off except my engine monitor (which has my volt and ammeters) to see 

if it is wired correctly and shows Aux Alternator output.  Should I 

start on the main system, turn on the engine monitor, and then 

switch the main to Batt, and then the E-bus on, and then the Aux Alt 

on, and then the Batt off?



If that is all correct, then airborne if I lose or shut down the 

main alternator, is the sequence the same?  Haven't got the diagrams 

with me at the moment and I'm trying to write a procedure.  Any help 

would be appreciated.


	


   You can't hurt anything with by mis-positioning switches.

   You won't see any output from the SD-8 without being

   well above 2000 rpm. So you can craft any procedure that

   makes sense to you.

        Bob . . .

                    ////

                   (o o)

    ===========o00o=(_)=o00o=========

    < Go ahead, make my day . . .   >

    < show me where I'm wrong.      >

    =================================

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logansc

Joined: 07 Dec 2009
Posts: 2

Posted: Tue Dec 08, 2009 4:48 am Post subject: Re: Switchology Question

Bob:  Thanks for the response.  I'll work out a "switchology" sequence today and try it this afternoon.



Regards,



Lee...

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jpx(at)qenesis.com
Guest

Posted: Tue Dec 08, 2009 11:02 am Post subject: Switchology Question

 	  Quote: 	
		       You won't see any output from the SD-8 without being

     well above 2000 rpm.


	


This caught me off guard and triggered me to look at the specs on the

B&C website.

I often cruise at 2200rpm.

Their web site says that for a Lycoming engine, the vacuum pad runs  

1.3:1 compared to the crankshaft.

So at 2200 rpm, the SD-8 is turning 2860 rpm.

Interpolating their chart idicates about 6A at that speed.

While idling, I will get a low voltage indication on my aux bus that I  

hadn't anticipated.  Perhaps I should be considering an SD-20.



Jeff Page

Dream Aircraft Tundra #10

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