mprather(at)spro.net
Guest
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 Posted: Fri Jul 24, 2009 3:20 pm Post subject: Voltage Drop / amp |
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| Quote: | From the discussion, I still haven't seen evidence that either alternator
is putting anything on either bus - the voltage reported doesn't
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correspond with them charging - I think that's what I was saying before.
Maybe they are charging, but no values have been reported that would
indicate as such.
It doesn't sound like you have a design or component selection problem - I
think you have all of the right pieces, but maybe not all of the
connections are exactly like they should be. I don't think adding a diode
here or there is going to make any difference. I suppose it is possible
that ended up with a diode some place there shouldn't be - but that means
it wasn't put together according to one of the Z-diagrams.
| Quote: | From my experience debugging problems like this, it always helps to have
an extra set of eyes (hopefully with a brain behind them) to which I
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explain how the system is supposed to work. I'll take the wiring diagram
(do you have one?) and point to each item on it and then to each item in
the real system. Then I point to each wire (connection) on the diagram
and then point to each wire in the system. Sometimes I'll even grab each
wire and tug on it a little to make sure I can tell where it's routed.
Often (the) problem(s) will become apparent well short of going through
the whole process. If I uncover something I don't understand I'll make
notes about that (sometimes just writing it down helps figure it out), and
then find someone I can explain my question to - even if they probably
won't have an answer.
I'm interested in seeing values for each of Bob's queries. I suspect the
solution to the problem may become apparent to you while taking the data.
Regards,
Matt-
| Quote: | At 10:51 AM 7/24/2009, you wrote:
>Thanks Bob for the info. My next trip to the airport will begin the
>process of trouble shooting as you suggest.
>
>In regards to this part of the email I made a typo..
>
>Now the questions. 1. Why the addition of the S204-1/diode combo(
>should have been S704-1 / diode combo) added at
>the endurance bus switch and will it be of value in my configuration to
> add
>it?
Okay. The normal e-bus feed path diode shown on Figure
Z-11 . . .
http://www.aeroelectric.com/PPS/Adobe_Architecture_Pdfs/Z11M.pdf
shows an isolation diode between the main bus and
the endurance bus. The purpose of this device is
to PREVENT the main bus from being powered up
from the E-bus during battery-only operations.
If you're subscribing to the design goals described
for the endurance bus, then this diode is necessary.
Do I deduce correctly that this diode is not presently
a part of your current configuration?
Bob . . .
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( . . . a long habit of not thinking )
( a thing wrong, gives it a superficial )
( appearance of being right . . . )
( )
( -Thomas Paine 1776- )
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