Today's Message Index:
----------------------
1. 06:58 PM - Electrical system planning (Jump4way)
2. 07:33 PM - Alternator Noise plus Volts & Amps Fluctuating ()
3. 09:10 PM - Re: Alternator Noise plus Volts & Amps Fluctuating (Robert L. Nuckolls, III)
4. 10:15 PM - Re: Electrical system planning (Bob Verwey)
Message 1
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| Subject: | Electrical system planning |
I'm at the early stages of planning my electrical system. I've got the Aeroelectric
connection book and am studying the diagrams to see which would fit my admittedly
rough plan.
I'm strongly considering the EFII electronic fuel and ignition system. Obviously
the electrical system design would be paramount to the success of this system.
What is the opinion of the group on the best design idea to follow? The z13-8
with the sd-8 alternator and a single battery? The z19 with dual battery and
electronic ignition, or just throw my hands up in the air and pick up the bus
manager system that EFII sells?
I'm leaning toward the z13-8 but I've got a question on what would happen if a
battery were to short internally. Would the alternator or backup alternator continue
to supply power to the busses to power the engine electronics?
Like I said, early stages here. Any advice is very welcomed.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=442966#442966
Message 2
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| Subject: | Alternator Noise plus Volts & Amps Fluctuating |
I had the opportunity to do a 7+ hour X/C a week or two ago and it was
driven into my head that I have a soft ~3 CPS noise in my headsets and
the voltmeter and ammeter readings are fluctuating at the same time and
frequency as the noise. If I turn off the alternator, the noise goes
silent and the ammeter and voltmeter stabilize too.
The ammeter shunt is measuring battery charge or discharge and the
voltmeter comes off of the buss downstream of the diode. Both gauges are
analog, and the needles are bouncing up and down by a half volt
(13.5-14V) and a half amp or thereabouts. The alternator is the B&C 40
amp unit and the regulator is the Ford unit recommended 15 years ago
when the airplane was built. All of the components have been in service
for 14 years and have approximately 950 hours of use on them.
Any suggestions on rectifying this condition?
Thanks,
Kyle Boatright
Message 3
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| Subject: | Re: Alternator Noise plus Volts & Amps Fluctuating |
At 09:31 PM 6/3/2015, you wrote:
>I had the opportunity to do a 7+ hour X/C a week or two ago and it
>was driven into my head that I have a soft ~3 CPS noise in my
>headsets and the voltmeter and ammeter readings are fluctuating at
>the same time and frequency as the noise. If I turn off the
>alternator, the noise goes silent and the ammeter and voltmeter stabilize too.
>
>The ammeter shunt is measuring battery charge or discharge and the
>voltmeter comes off of the buss downstream of the diode. Both gauges
>are analog, and the needles are bouncing up and down by a half volt
>(13.5-14V) and a half amp or thereabouts. The alternator is the
>B&C 40 amp unit and the regulator is the Ford unit recommended 15
>years ago when the airplane was built. All of the components have
>been in service for 14 years and have approximately 950 hours of use on them.
>
>Any suggestions on rectifying this condition?
>
>Thanks,
>
>Kyle Boatright
The voltage regulator sense voltage shares
a path with alternator field current in this
regulator. This condition is well known in
architectures of this type and is offten called
the 'galloping ammeter'. In the older Cessnas,
I recommend replacing everything from the bus
bar to the regulator which would include breaker,
alternator switch and wires.
Doing any ONE thing might 'cure' the problem but
it's the sum-total of environmentally driven resistance
creep that finally stacks up to cause the instability.
You may cure it with one replacement but only by
replacing ALL will you get back to as-new condition.
See
http://www.aeroelectric.com/articles/Alternators/Know_Your_Charging_System.pdf
Bob . . .
Message 4
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| Subject: | Re: Electrical system planning |
As always KISS rules!
Think very carefully about your mission.....
On 4 June 2015 at 03:56, Jump4way <andydelk@gmail.com> wrote:
>
> I'm at the early stages of planning my electrical system. I've got the
> Aeroelectric connection book and am studying the diagrams to see which
> would fit my admittedly rough plan.
>
> I'm strongly considering the EFII electronic fuel and ignition system.
> Obviously the electrical system design would be paramount to the success of
> this system. What is the opinion of the group on the best design idea to
> follow? The z13-8 with the sd-8 alternator and a single battery? The z19
> with dual battery and electronic ignition, or just throw my hands up in the
> air and pick up the bus manager system that EFII sells?
>
> I'm leaning toward the z13-8 but I've got a question on what would happen
> if a battery were to short internally. Would the alternator or backup
> alternator continue to supply power to the busses to power the engine
> electronics?
>
> Like I said, early stages here. Any advice is very welcomed.
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=442966#442966
>
>
--
Best...
Bob Verwey
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