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Engine analyzer OFF for engine start?

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Kellym

Joined: 10 Jan 2006
Posts: 1706
Location: Sun Lakes AZ

Posted: Sun Sep 10, 2006 6:13 am Post subject: Engine analyzer OFF for engine start?

I'm installing an EI UBG16. The instructions are very clear that they 

believe the unit should be on an avionics switch and turned OFF for 

engine start. Which of course raises the question in my mind, why?

Did they shortcut on voltage regulation or spike/noise protection for 

the units power supply?



The aircraft in question has a Delco 50 amp generator and a Zeftronics 

solid state regulator, which appears to be very good at holding 14.1 v 

at all rpms above 1100.

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_________________
Kelly McMullen
A&P/IA, EAA Tech Counselor # 5286
KCHD

nuckollsr(at)cox.net
Guest

Posted: Sun Sep 10, 2006 9:51 am Post subject: Engine analyzer OFF for engine start?

At 07:12 AM 9/10/2006 -0700, you wrote:



 	  Quote: 	
		  



I'm installing an EI UBG16. The instructions are very clear that they 

believe the unit should be on an avionics switch and turned OFF for engine 

start. Which of course raises the question in my mind, why?

Did they shortcut on voltage regulation or spike/noise protection for the 

units power supply?



The aircraft in question has a Delco 50 amp generator and a Zeftronics 

solid state regulator, which appears to be very good at holding 14.1 v at 

all rpms above 1100.


	


   I'm saddened that any product offered to general aviation

   or any other market is still burdened with such admonitions

   in their installation instructions. It's a blatant admission

   that they're incapable or unwilling to make their product

   live in the real-world environment of DC power systems and/or

   simply don't understand the world in which they choose to

   live. See:



http://www.aeroelectric.com/articles/Whats_all_this_DO160_Stuff_Anyhow.pdf#search=%22avionics%20master%22



http://www.aeroelectric.com/articles/avmaster.pdf

    It's the engineering equivalent of child's play to

    craft products totally compatible with DC vehicular

    power systems.



    One can only guess at the rational behind their inclusion

    of such a statement . . . and maybe it's for the same reasons

    cited by a number of engineers I've queried over the past

    30 years:



    "Sir, why do the instructions for your product recommend

    powering it from an 'avionics' bus 'protected' by an avionics

    master switch?"  The replies something like, "Gee, I guess

    just 'cause other folks are doing it. I personally don't care."



    Call them up and ask . . .



    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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klehman(at)albedo.net
Guest

Posted: Sun Sep 10, 2006 11:50 am Post subject: Engine analyzer OFF for engine start?

Hi Kelly

Just an observation but the GRT engine monitor specifically recommends 

powering it up before engine start and confirming zero oil pressure 

indication. On my particular installation it resets anyway during start 

but I have not investigated whether it is voltage dropout during 

cranking or momentary loss of power from my marine key switch which 

controls power to it and the starter. It is back up in a second or so 

anyway.

Ken L.



Kelly McMullen wrote:



 	  Quote: 	
		   

 <kellym(at)aviating.com>



 I'm installing an EI UBG16. The instructions are very clear that they 

 believe the unit should be on an avionics switch and turned OFF for 

 engine start. Which of course raises the question in my mind, why?

 Did they shortcut on voltage regulation or spike/noise protection for 

 the units power supply?



 The aircraft in question has a Delco 50 amp generator and a Zeftronics 

 solid state regulator, which appears to be very good at holding 14.1 v 

 at all rpms above 1100.

- The Matronics AeroElectric-List Email Forum -

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:

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