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richard(at)talbots.net.au
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nuckolls.bob(at)cox.net
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 Posted: Mon Dec 24, 2007 1:43 pm Post subject: SD-8 |
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At 09:30 AM 12/24/2007 +1100, you wrote:
| Quote: |
<richard(at)talbots.net.au>
Hi Bob,
I have a couple of questions regarding your diagram for SD8 alternator self
excitation (Z-1 .
You call out 12 AWG wiring between the dynamo and the regulator but the
dynamo already has a run of 16AWG attached to it by B&C. Everywhere else in
the diagram you specify 14 AWG. I assume you wish to minimise voltage drop
to the regulator? The only issue is that I don't have any 12 AWG wire.
What would you think is the maximum length of 14AWG that could be used here
and/or what are your design intentions as far as voltage drop?
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The 12AWG was called out for Canard Pushers with
alternator in tail and battery up front. 14AWG is
fine for what you want to do.
| Quote: | I have ordered a 5A cct breaker for the SD8 previously. Is it OK to
substitute the 20AWG to the breaker for 18 AWG and use 5A cct breaker rather
than 2A?
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Sure.
| Quote: | Lastly, does anyone have pictures of their installation particularly the
mountings of diodes and resistors? The 2k7 resistors supplied to me are in
ceramic casing due to their power ratings. I am concerned about vibration
as the legs are very thin.
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Yeah . . . resistors are generally designed to
solder to an etched circuit board. I picked
the 3W devices to get a robust package. The
actual power dissipated in these resistors
is quite small.
Put a ring terminal on each end of the resistor
mounted on the capacitor. Cut leads so that the
resistor can be dressed down against the end of
the capacitor and spotted in place with a dab
of E6000 (ShooGoo). See:
http://www.aeroelectric.com/Pictures/Alternators/SD8_SelfExcite_B.jpg
The resistor on the rectifier can be similarly
fitted with terminals. One end can go to the
rectifier's (-) terminal and the other end to
the rectifier mounting screw. See:
http://www.aeroelectric.com/Pictures/Alternators/SD8_SelfExcite_A.jpg
Bob . . .
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