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Newbie Z-21A question

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sonexpilot(at)gmail.com
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Posted: Sun Jul 20, 2008 6:44 am Post subject: Newbie Z-21A question

Hi.  I'm new to this list and am no electrical expert.  I am about to get started on the electrical system for my Jabiru 3300 Sonex, and I've been studying all of the material in the Connection web site.   I have the following questions about the Z-21A diagram.  In the diagram the wires out of the alternator are wired to a Diode Bridge but nothing is wired to the Power Load (+).  What is this Diode Bridge for?  Also the Voltage Rectifier/Regulator in my jabiru engine has an extra positive (yellow) wire.  Where in this diagram can I connect this wire? In a couple of places I see squigully lines with labeles like 1K, 3w and 3K, 3W, are these resistors?  Are they really needed?  What for?

 

Thank you all for any help.



Regards,

Jorge Rodriguez



  [quote][b]

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nuckolls.bob(at)cox.net
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Posted: Sun Jul 20, 2008 7:07 am Post subject: Newbie Z-21A question

At 10:41 AM 7/20/2008 -0400, you wrote:

 	  Quote: 	
		  Hi.  I'm new to this list and am no electrical expert.  I am about to get 

started on the electrical system for my Jabiru 3300 Sonex, and I've been 

studying all of the material in the Connection web site.   I have the 

following questions about the Z-21A diagram.  In the diagram the wires out 

of the alternator are wired to a Diode Bridge but nothing is wired to the 

Power Load (+).  What is this Diode Bridge for?  Also the Voltage 

Rectifier/Regulator in my jabiru engine has an extra positive (yellow) 

wire.  Where in this diagram can I connect this wire? In a couple of 

places I see squigully lines with labeles like 1K, 3w and 3K, 3W, are 

these resistors?  Are they really needed?  What for?


	


   Note 25 of



http://aeroelectric.com/articles/Rev11/AppZ_R11M.pdf



  speaks to this question:



--------------------------

Note 25. Making the SD-8 Come-Alive without a

battery:



Subsequent to some excellent 'skunk werks' efforts

on the part of Jim McCulley, the 'Connection is pleased to

offer a work-around to older SD-8 alternator installations

that encourages this useful product to come on line without

benefit of a battery. Adding a pair of diodes and a start-up

bias resistor as shown in Z-25, the SD-8 will come up and

run as soon as the engine is started.



I've suggested the diode bridge rectifier for this application

but you can use wired-leaded devices like 1N5400 series

devices from Radio Shack and others. The advantage of the

diode-bridge is that splices between dynamo and regulator

lead wires can happen in the same PIDG terminals used to

wire the rectifier.



Suitable parts include the following Digikey catalog

numbers:



1 each 1GBPC1204/1 Diode Bridge

1 each ALSR3F1.0K 1,000 Ohm/3W

1 each ALSR3F3.0K 3,000 Ohm/3W

2 each 1N5400 3A, 50V Diode Rectifier



These parts are chosen more for their mechanical

configuration and robustness than for electrical ratings.

Many other styles of parts may be substituted. With these

added parts, one may connect a voltmeter across the 22,000

uFd filter capacitor. A few seconds after the engine is

started, one should observe that the voltage across the

capacitor jumps up to about 6 volts at engine idle. The

voltage rises with RPM until the regulator takes over to

maintain output at about 14.2 volts at cruise RPM.

----------------------



    I don't recall now the rationale for applying this

    technique to the Jabiru drawings. The ability of the

    PM alternator to come on line without a battery is

    a function of RECTIFIER/REGULATOR design. We know

    that regulators supplied with the SD-8 have not

    exhibit this ability in the past and adding the

    resistors and diodes cited above are a reasonable

    approach to making the system work without a

    battery.



    However, I don't recall if we had specific information

    about the rectifier/regulator supplied/recommended

    for use with Jabiru's PM alternators. For now, leave

    the parts cited off. See how your particular alternator-

    rectifier/regulator behaves and then get back with us

    on the List if you determine that it will not come

    up without a battery and you would like for it to

    have that feature.



    This is not a big deal worthy of your concerns right

    now, let's take this up in the future after you've

    slain all the dragons.



    Bob . . .

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DaveG601XL

Joined: 27 Oct 2006
Posts: 351
Location: Cincinnati, Oh

Posted: Sun Jul 20, 2008 4:11 pm Post subject: Re: Newbie Z-21A question

Jorge,



The yellow wire is a voltage sense line.  Tie it in with your red output wire.  It needs to see what the output voltage of that line is in order for the regulator to do its job.



Good Luck,

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_________________
David Gallagher
Cincinnati, OH area

nuckolls.bob(at)cox.net
Guest

Posted: Sun Jul 20, 2008 5:18 pm Post subject: Newbie Z-21A question

At 05:11 PM 7/20/2008 -0700, you wrote:

 	  Quote: 	
		  

<david.m.gallagher(at)ge.com>



Jorge,



The yellow wire is a voltage sense line.  Tie it in with your red output 

wire.  It needs to see what the output voltage of that line is in order 

for the regulator to do its job.


	


   Dave, the last wiring diagram I saw for the 3300

   was this thing gleaned from the installation/instruction

   manual.



http://aeroelectric.com/Pictures/Schematics/Jabiru_3300_Alternator_Wiring.jpg



   Is there something more up to date available? This

   first cut at it was exceedingly unhelpful and doesn't

   have a yellow wire.

   Bob . . .

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