Today's Message Index:
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1. 09:19 AM - Re: Re: ADS-B and Transponder antenna design... (Robert L. Nuckolls, III)
2. 01:38 PM - Re: Re: voltage monitor (skywagon185guy)
3. 02:05 PM - Re: Re: voltage monitor (Robert L. Nuckolls, III)
4. 09:13 PM - field current supplied from B lead instead of from main bus (johnbright)
Message 1
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| Subject: | Re: ADS-B and Transponder antenna design... |
>
>
>he described them with pics several days ago.
Oh yeah . . . the pix didn't come thru here but okay . . .
understand now.
Bob . . .
Message 2
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| Subject: | Re: voltage monitor |
I personally like the idea of a panel light that will make you aware of
Under and well as Over voltage conditions.
I have experienced an under voltage on start up. Caused by a defective main
circuit breaker that opened, but did not show an indication that it had
mysteriously opened. Luckily, before beginning the taxi, I noted the
amp/volt meter was amiss.
Tested the CB and could not get it to reset. Installed new CB and had no
additional problems.
On Fri, Oct 2, 2020 at 3:41 AM bobnoffs <icubob@gmail.com> wrote:
>
> i ordered the tom top unit. for $5 i gotta see how it works.
> talked to perihelion and i believe they can build their 'idiot light'
> to my specs.this is a panel light with the electronics self contained.
> any more suggestions i would like to hear.
> thanks, bob noffs
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=498628#498628
>
>
Message 3
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| Subject: | Re: voltage monitor |
At 03:35 PM 10/3/2020, you wrote:
>I personally like the idea of a panel light that
>will make you aware of Under and well as Over voltage conditions.
>I have experienced an under voltage on start up.
>Caused by a defective main circuit breaker
>that opened, but did not show an indication that it had mysteriously
opened.
Then I take it that your system was not fitted
with active notification of low voltage. This
feature is the FIRST if not the ONLY voltage
sensing/indicating device NECESSARY for flight
operations.
Preferably, this light is bright (sunlight viewable)
and located well within peripheral vision of the pilot.
Further, it should flash at 2-3 times per second
(a legacy value for optimal attention getting
arrived at by numerous human factors studies ).
This light has been a no-extra-charge built in feature
of virtually all B&C alternator controllers. From
day-one (about 35 years ago). It was B&C's mission that
no customer would be without BOTH low volts and
over volts management.
Luckily, before beginning the taxi, I noted the amp/volt meter was amiss.
>Tested the CB and could not get it to
>reset.=C2 Installed new CB and had no additional problems.
Yes, there was an element of luck associated with
that experience. I'm pleased the event resolved
without a tense-day-in-the-cockpit.
Along with active notification of low volts, you
should plan on independent management of an over
voltage condition with a system that disables
the alternator within 500 milliseconds of having
exceeded 16 volts.
Depending on design parameters of the designer,
the ov event will be over very soon thus leaving
you with a low volts condition that will be
annunciated as cited above.
Fit your airplane with those two features and
all the other voltmeters, ammeters, beeps
and squawks from the panel mounted goodies
become mere icing on the cake.
Bob . . .
Message 4
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| Subject: | field current supplied from B lead instead of from |
main bus
Hi Bob,
Someone in my sphere suggested getting field current from the B lead instead of
from the main bus.
This way if the B lead shorts to ground and the fuselink opens, the field will
be de-energized.
Marked up snip of Z101B attached.
Comments?
Thanks
--------
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
https://drive.google.com/drive/folders/1u6GeZo6pmBWsKykLNVQMvu4o1VEVyP4K
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=498646#498646
Attachments:
http://forums.matronics.com//files/is_connecting_field_supply_to_b_lead_a_good_idea_210.jpg
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