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nuckolls.bob(at)aeroelect
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 Posted: Wed May 20, 2009 2:57 pm Post subject: Alternator Failure |
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At 05:16 PM 5/20/2009, you wrote:
| Quote: | Hi Bob,
Could you please help me with a low voltage problem that I am having
in my RV7. Voltage indicators on the Dynon and engine monitor both
show fluctuations between 12.5V and 11.5V while in flight.
|
These are the voltages you can expect from a battery
that is NOT benefiting from support by the alternator.
| Quote: | This is something that just started during the last few flights, I
have 300h on the airplane with this being the first problem. I have
had the ND 60A internally regulated alternator form Vans in the
shop and it checked out fine.
|
If the alternator is okay, then it's deprived of
an ON/OFF command that controls it . . . or is
otherwise disconnected from the system.
With the engine not running but with battery and
alternator switches ON, you should measure some
voltage close to the battery output at all wires
attached to the alternator. If no/low voltage at
the b-lead terminal, perhaps your b-lead fuse or
current limiter is open. If no/low voltage to
the control terminal, then there is a failure in
the wiring between that terminal and the bus.
| Quote: | I also have put in a new battery with no improvements. Airplane
wired as per Z11 with an added electronic ignition on the top side
|
I wouldn't expect a battery to fix this. The alternator
is definitely not being allowed to do its job
for some reason.
Bob . . .
----------------------------------------)
( . . . a long habit of not thinking )
( a thing wrong, gives it a superficial )
( appearance of being right . . . )
( )
( -Thomas Paine 1776- )
----------------------------------------
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franz(at)lastfrontierheli
Guest
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| Posted: Wed May 20, 2009 3:52 pm Post subject: Alternator Failure |
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Thanks for your prompt reply, I will investigate further
Franz
On 20/05/09 3:55 PM, "Robert L. Nuckolls, III"
<nuckolls.bob(at)aeroelectric.com> wrote:
| Quote: |
<nuckolls.bob(at)aeroelectric.com>
At 05:16 PM 5/20/2009, you wrote:
> Hi Bob,
> Could you please help me with a low voltage problem that I am having
> in my RV7. Voltage indicators on the Dynon and engine monitor both
> show fluctuations between 12.5V and 11.5V while in flight.
These are the voltages you can expect from a battery
that is NOT benefiting from support by the alternator.
> This is something that just started during the last few flights, I
> have 300h on the airplane with this being the first problem. I have
> had the ND 60A internally regulated alternator form Vans in the
> shop and it checked out fine.
If the alternator is okay, then it's deprived of
an ON/OFF command that controls it . . . or is
otherwise disconnected from the system.
With the engine not running but with battery and
alternator switches ON, you should measure some
voltage close to the battery output at all wires
attached to the alternator. If no/low voltage at
the b-lead terminal, perhaps your b-lead fuse or
current limiter is open. If no/low voltage to
the control terminal, then there is a failure in
the wiring between that terminal and the bus.
> I also have put in a new battery with no improvements. Airplane
> wired as per Z11 with an added electronic ignition on the top side
I wouldn't expect a battery to fix this. The alternator
is definitely not being allowed to do its job
for some reason.
Bob . . .
----------------------------------------)
( . . . a long habit of not thinking )
( a thing wrong, gives it a superficial )
( appearance of being right . . . )
( )
( -Thomas Paine 1776- )
----------------------------------------
|
| | - 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:
http://www.matronics.com/Navigator?AeroElectric-List |
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franz(at)lastfrontierheli
Guest
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| Posted: Mon May 25, 2009 1:34 pm Post subject: Alternator Failure |
|
|
Hi Bob,
Just letting you know that after some trouble shooting I found the culprit
of my problems, a loose connection that I overlooked many times, all is
working as it should again
Thanks
Franz
On 20/05/09 3:55 PM, "Robert L. Nuckolls, III"
<nuckolls.bob(at)aeroelectric.com> wrote:
| Quote: |
<nuckolls.bob(at)aeroelectric.com>
At 05:16 PM 5/20/2009, you wrote:
> Hi Bob,
> Could you please help me with a low voltage problem that I am having
> in my RV7. Voltage indicators on the Dynon and engine monitor both
> show fluctuations between 12.5V and 11.5V while in flight.
These are the voltages you can expect from a battery
that is NOT benefiting from support by the alternator.
> This is something that just started during the last few flights, I
> have 300h on the airplane with this being the first problem. I have
> had the ND 60A internally regulated alternator form Vans in the
> shop and it checked out fine.
If the alternator is okay, then it's deprived of
an ON/OFF command that controls it . . . or is
otherwise disconnected from the system.
With the engine not running but with battery and
alternator switches ON, you should measure some
voltage close to the battery output at all wires
attached to the alternator. If no/low voltage at
the b-lead terminal, perhaps your b-lead fuse or
current limiter is open. If no/low voltage to
the control terminal, then there is a failure in
the wiring between that terminal and the bus.
> I also have put in a new battery with no improvements. Airplane
> wired as per Z11 with an added electronic ignition on the top side
I wouldn't expect a battery to fix this. The alternator
is definitely not being allowed to do its job
for some reason.
Bob . . .
----------------------------------------)
( . . . a long habit of not thinking )
( a thing wrong, gives it a superficial )
( appearance of being right . . . )
( )
( -Thomas Paine 1776- )
----------------------------------------
|
| | - 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:
http://www.matronics.com/Navigator?AeroElectric-List |
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nuckolls.bob(at)aeroelect
Guest
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| Posted: Tue May 26, 2009 3:06 pm Post subject: Alternator Failure |
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At 04:31 PM 5/25/2009, you wrote:
| Quote: |
<franz(at)lastfrontierheli.com>
Hi Bob,
Just letting you know that after some trouble shooting I found the culprit
of my problems, a loose connection that I overlooked many times, all is
working as it should again
Thanks
Franz
|
Very good sir. Keep the dirty side down and the pointy
end forward!
Bob . . .
----------------------------------------)
( . . . a long habit of not thinking )
( a thing wrong, gives it a superficial )
( appearance of being right . . . )
( )
( -Thomas Paine 1776- )
----------------------------------------
| | - 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:
http://www.matronics.com/Navigator?AeroElectric-List |
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