Today's Message Index:
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1. 12:38 PM - Re: Primary Power Diagram RV-14 (Mudfly)
2. 02:47 PM - Re: Primary Power Diagram RV-14 (Ceengland)
3. 04:15 PM - Re: Intermittent Charging (H. Ivan Haecker)
4. 05:22 PM - Re: Primary Power Diagram RV-14 (Mudfly)
5. 06:04 PM - Re: Primary Power Diagram RV-14 (Mudfly)
6. 06:04 PM - Re: Primary Power Diagram RV-14 (johnbright)
7. 07:53 PM - Re: Primary Power Diagram RV-14 (user9253)
Message 1
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| Subject: | Re: Primary Power Diagram RV-14 |
I have made changes to the Primary Power system design. I switched
from CBs to fuses as recommended my several. I eliminated one bus
completely, and moved the Hot Batt Bus firewall fwd. I am still reviewing
fuse and wire sizing. For Busses, I will be using the Eaton 15711-20-11A
for the Main Power Bus, and the Bussmann 156-14-20 for the
Avionics/Essential Bus. The Main Power Bus will be located in the cabin
on the fwd portion of the center tunnel. There is a vertical post there in
the RV14 that works well for fuses and CBs. The avionics bus will also be
in the cabin located under the Rt side of the avionics compartment..just
above co-pilots knees. It will be mounted with fuses facing the deck.
One question I have regards the avionics relay. I've read that some
prefer a normally closed relay in case of switch failure. Would it
also allow less "wear and tear" on the relay during normal use?
Most of the time, this relay will be closed which requires constant
power to close the relay. Will this cause heat / pre-mature wear? Just curious.
Please feel free reply with any observations/suggestions for this new
design.
Thanks.
Shawn
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=510322#510322
Attachments:
http://forums.matronics.com//files/primary_power_system_mar2_130.pdf
Message 2
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| Subject: | Re: Primary Power Diagram RV-14 |
If you use a normally closed relay, it will be closed unless the coil is powered.
If you need to 'load shed', then you'll be adding the relay load to shed the
rest of the load.
My purchased RV6 has a center post under the instrument panel. It is an unbelievable
pain in the backside (and back) every time I have to dumpster dive under
the panel. I'd just take it out, but the builder routed every single wire going
aft of the spar down that post. If the -14 console is there, you might want
to give that some thought. ;-)
Can you maybe use a jpg attachment instead of pdf? That way we could see the image
of the drawing without having to download & save it to our computers each
time.
--------
Charlie
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=510324#510324
Message 3
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| Subject: | Re: Intermittent Charging |
To those who have been following my sad tale of woe, I have good news to
report. Today I took my alternator to another auto parts store and had
another test run performed. Again I was told that the alternator was
performing normally. So I purchased a new regulator (Ford type) and
installed it. Everything has now returned to normal as the onboard volt
meter stayed steady at about 14.5 volts no matter what the rpm. My
conclusion is that despite the original regulator seeming to provide
expected input to the field of the regulator, it wasn=99t. Perhaps if
I had
measured the current flow as Joe suggested, I could have determined that.
In any case, I appreciate all the responses to my original post.
Ivan Haecker
On Wed, Mar 1, 2023 at 10:41 PM H. Ivan Haecker <hivanhaecker@gmail.com>
wrote:
> No flying today, so I decided to remove the alternator and have it tested
> at an auto parts store. Much to my surprise, they said it was fine. I
> rechecked the connectors at both the alternator and the voltage regulator
> and can=99t find anything wrong there. I still want to check for an
y AC
> voltage coming to the main bus dispute what the auto place said. There mu
st
> be a smoking gun somewhere.
> Ivan Haecker
>
> On Wed, Mar 1, 2023 at 10:15 AM Robert L. Nuckolls, III <
> nuckolls.bob@aeroelectric.com> wrote:
>
>> At 09:20 PM 2/28/2023, you wrote:
>>
>> Yes, as the engine rpm goes up, field voltage begins to go down and the
>> panel voltmeter goes down to battery voltage (12.5v). At idle, the field
>> voltage goes up and the panel voltage in turn rises back to ~14.5v. The
>> plane is an rv-4 which I=C3=A2=82=AC=84=A2ve been flying for 31 yr
s. The regulator is a
>> NAPA ford type (VR 440) that has been in service for 7 yrs. The alternat
or
>> is an Auto Zone #14184 (I think 30 amp or so),
>>
>>
>> that's a 35 amp alternator which was Van's
>> first pick many, many moons ago. 14184 is
>> the Lester number for a Denso part that
>> was used on a constellation of automobiles.
>>
>> https://tinyurl.com/2zxwvabs
>>
>> and it has been in service 14 yrs.
>>
>>
>> You got your money's worth out of that one!
>>
>> Also I have lately noticed a whine in the radio audio that
>> changes with rpm. I don=C3=A2=82=AC=84=A2t know if that is relate
d to my problem or
>> not.=C3=82
>>
>>
>> May very well be . . . loss of performance in
>> one or more phases of the alternator causes
>> a profound increase in the AC ripple voltage
>> riding on the DC output . . . it also manifests
>> in a degraded output capability.
>>
>> The increased ripple voltage is often manifest
>> by a sudden presence of alternator whine
>> in an audio system.
>>
>> The numbers you cited for regulator behavior
>> seem reasonable . . . I'd vote for an alternator
>> replacement. Many parts stores can run your
>> alternator on a test bench while being
>> able to offer an off-the-shelf replacement.
>> That '14184' is the key to a drop-in
>> replacement.
>>
>>
>>
>> Bob . . .
>>
>> Un impeachable logic: George Carlin asked, "If black boxes
>> survive crashes, why don't they make the whole airplane
>> out of that stuff?"
>>
>
Message 4
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| Subject: | Re: Primary Power Diagram RV-14 |
[quote="Ceengland"]If you use a normally closed relay, it will be closed unless
the coil is powered. If you need to 'load shed', then you'll be adding the relay
load to shed the rest of the load.
My purchased RV6 has a center post under the instrument panel. It is an unbelievable
pain in the backside (and back) every time I have to dumpster dive under
the panel. I'd just take it out, but the builder routed every single wire going
aft of the spar down that post. If the -14 console is there, you might want
to give that some thought. ;-)
Can you maybe use a jpg attachment instead of pdf? That way we could see the image
of the drawing without having to download & save it to our computers each
time.[/quote]
Thanks Charlie.
I'll have to think about the relay scenarios over coffee in the morning. I
have an essential switch that will load shed the main power bus. The avionics/essential
bus can then be powered by the stby alt or the batt. I suppose there
could be a situation where I may need to only shed the avionics/esential bus.
However, unless there's a good reason to have the relay normally closed, I would
prefer to keep it normally open. I'm using a lighted honeywell AML34 rocker
switch for the avionics switch. If I have to turn it upside down the lighted
portion won't match the others in the row.
Also, thanks for the idea to convert my attached pdf files to jpg. I will
see if I can make that happen.
Shawn
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=510329#510329
Message 5
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| Subject: | Re: Primary Power Diagram RV-14 |
Attempting to attach jpg file of Primary Power system.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=510330#510330
Attachments:
http://forums.matronics.com//files/primary_power_system_mar2_134.jpg
Message 6
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| Subject: | Re: Primary Power Diagram RV-14 |
Ceengland wrote:
> Can you maybe use a jpg attachment instead of pdf? That way we could see the
image of the drawing without having to download & save it to our computers each
time.
Im happy with PDFs and if the JPG is large in pixels it will force the text in
the thread to be small. Either way, I generally download an attached schematic.
JPG will be fine for me if the fidelity is good. Maybe attach both.
--------
John Bright, RV-6A, at FWF, O-360
Z-101 single batt dual alt SDS EM-5-F.
john_s_bright@yahoo.com, Newport News, Va
<a href="https://docs.google.com/document/d/1YOtPiA3AdUsQEYR4nodBESNAo21rxdnx4pFs7VxXfuI/edit"
target="_blank">N1921R links</a>
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=510331#510331
Message 7
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| Subject: | Re: Primary Power Diagram RV-14 |
I prefer pdf also.
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=510332#510332
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