REFLECTOR:Alternator Terminals ...

KeithHallsten reflector@tvbf.org
Sun, 19 Oct 2003 18:22:49 -0700


Jim,

I should have also included a reference to
http://www.aeroelectric.com/FAQ/Internal_Regulator/
for a more complete discussion of internally-regulated vs.
externally-regulated alternators.

Keith

----- Original Message ----- 
From: "Jim Sower" <canarder@frontiernet.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>;
<aeroelectric-list@matronics.com>; <reflector@tvbf.org>
Sent: Sunday, October 19, 2003 5:32 PM
Subject: REFLECTOR:Alternator Terminals ...


>     Question for all you EEs out there.  I'm putting a new alternator on
my
> Velocity.  This one will be internally regulated (and have the appropriate
> "crowbar" OV protection.  The unit I am installing has two terminals
> arranged in a "T".  One is "field" and the other is "Indicator" (idiot
> light).  I am blessed that the builder didn't have a 20- or 22- ga wire to
> string from the "Alt"  (split Alt-Master) switch, so he used both
conductors
> of 2-wire shielded 24 ga for the 12 ft run from the switch to the
> regulator.  Anyway, I am betting that one will be enough to excite the
> regulator and I can use the other for an idiot light.
>
> Thing is, I have to determine which is which and how the "I" lead works
(is
> it hot or grounded when there is no output).  I aim to wire things up with
> jumpers and spin the alternator by hand, so to get the charging voltage at
> B+ I will need a resistor between B+ and the line back to the battery.
That
> done, I can connect stuff up and see if, when all ready to go, the "I"
lead
> is hot or grounded, and if it goes cold or breaks ground connection when I
> spin up the unit.
>
> My questions are:  Will this work (will I be able to easily twirl the
pulley
> and get charging voltage if I put the proper resistor in the circuit (so
it
> doesn't have to generate much current in order to build up charging
> voltage)?  What would be an appropriate resistance (and size) of the
> resistor I am placing in the circuit?
>
> I know I could have all this done at an alternator rebuild shop, but
there's
> none convenient to me
>
> Hope this will work.  Makes sense to me at this point .... Jim S.
>
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