Today's Message Index:
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1. 08:30 AM - Re: Re: fuses in series (Robert L. Nuckolls, III)
2. 10:35 AM - Intermittent Charging (H. Ivan Haecker)
3. 11:19 AM - Re: Intermittent Charging (Charles Kuss)
4. 01:43 PM - Re: Intermittent Charging (Radioflyer)
5. 01:53 PM - Re: Intermittent Charging (Charlie England)
6. 02:01 PM - Narco ID-825 indicator (Radioflyer)
7. 03:02 PM - Re: Intermittent Charging (H. Ivan Haecker)
8. 03:07 PM - Re: Re: Intermittent Charging (H. Ivan Haecker)
9. 04:29 PM - SD-8 Self Exciting via Z25L (andymeyer)
Message 1
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| Subject: | Re: fuses in series |
At 07:58 PM 2/25/2023, you wrote:
>So, you're pressed for time because you're flying IFR and about to
>fly an approach? Kinda violates the whole idea of saving
>troubleshooting until you're on the ground.
>
Agreed. If failure of ANY component of your project
places you at operational risk then you need to
have a back-up for it. Back-up may be totally dependent
on your personal skills. Ever shoot an approach DG-needle-
ball-and-airspeed? I used to ride shotgun for an associate that
routinely practiced that. Never watched him shoot the
approaches with everything working, "That's easy sez
he . . . I need to be prepared for the hard ones"
For every failure that manifests with open circuit
protection there are dozens of conditions equally
deleterious to system operations that DO NOT open
circuit protection. Further, if circuit protection
does open in flight, what is the probability that
restoring power will gain use of that system? If
the fuse opens, something is BROKE. Time to switch
to plan-B.
FAT wire protection goes to crash safety . . . if
your airplane is so badly balled up that FAT wires
are likely to experience hard faults . . . it's
likely your bod is equally balled up. That's
what battery master contactors and current limited
battery busses are all about.
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 2
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| Subject: | Intermittent Charging |
Something is amiss with my charging system. Upon initial start, normal
charging voltage occurs. A few minutes into flight, the voltage has dropped
to battery only. Upon landing, it=99s back up to normal charging volt
age.
This has occurred on the last three flights. I can=99t find any obvio
us loose
connections and a voltage check with a VOM in flight shows the shipboard
volt meter is accurate. So I suppose it is either an alternator or external
regulator (ford type) problem. Is there a way in flight to determine which
is the culprit? Maybe check the output voltage from the field terminal to
the alternator while in flight? Any advice would be appreciated.
Ivan Haecker
Message 3
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| Subject: | Re: Intermittent Charging |
You can bypass the voltage regulator to force the alternator generate full
output. I suggest you start by reading:
https://www.freeasestudyguides.com/alternator-full-field-test.html
On Sunday, February 26, 2023, 01:44:38 PM EST, H. Ivan Haecker <hivanh
aecker@gmail.com> wrote:
Something is amiss with my charging system. Upon initial start, normal cha
rging voltage occurs. A few minutes into flight, the voltage has dropped to
battery only. Upon landing, it=99s back up to normal charging voltag
e. This has occurred on the last three flights. I can=99t find any ob
vious loose connections and a voltage check with a VOM in flight shows the
shipboard volt meter is accurate. So I suppose it is either an alternator o
r external regulator (ford type) problem. Is there a way in flight to deter
mine which is the culprit? Maybe check the output voltage from the field te
rminal to the alternator while in flight? Any advice=C2-would be apprecia
ted.Ivan Haecker
Message 4
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| Subject: | Re: Intermittent Charging |
I think the first thing I would do is to connect a temporary extension wire from
the field wire going directly into the alternator into the cabin/cockpit so
that you can measure the field Volts. If the field Volts are not normal or go
too low, then its not the alternator. Bob N. discusses this in his book (diag.
Z-23) and advises putting a 1k Ohm resistor in this line to limit any shorting
potential.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=510283#510283
Message 5
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| Subject: | Re: Intermittent Charging |
On 2/26/2023 12:35 PM, H. Ivan Haecker wrote:
> Something is amiss with my charging system. Upon initial start, normal
> charging voltage occurs. A few minutes into flight, the voltage has
> dropped to battery only. Upon landing, its back up to normal charging
> voltage. This has occurred on the last three flights. I cant find any
> obvious loose connections and a voltage check with a VOM in flight
> shows the shipboard volt meter is accurate. So I suppose it is either
> an alternator or external regulator (ford type) problem. Is there a
> way in flight to determine which is the culprit? Maybe check the
> output voltage from the field terminal to the alternator while in
> flight? Any advicewould be appreciated.
> Ivan Haecker
>
Does it instantly drop from 14+V charge voltage to battery voltage, or
does it decay slowly from charge voltage to battery voltage? (Instant
drop might indicate a loose connection, though I'd expect an
intermittent connection issue to come and go within the same flight.
Have you checked your alternator belt for proper tension?
--
This email has been checked for viruses by Avast antivirus software.
www.avast.com
Message 6
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| Subject: | Narco ID-825 indicator |
I happen to have a Narco ID-825 indicator that can display VOR/LOC/Glideslope.
I can't find and technical info on it. Can anyone tell me if this indicator contains
an internal VOR/LOC "converter". My KX165 nav/com with glideslope has its
own converter and therefore needs an indicator without the converter. It would
be great if I can use the ID-825 with the KX-165.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=510285#510285
Message 7
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| Subject: | Re: Intermittent Charging |
I can=99t say whether it is an instant drop or not. I=99ve neve
r been watching
the volt meter when it happens. I did however observe it fluctuating one
time. The gauge showed about 13v and was moving jerkily for a few seconds
and then went to battery voltage and stayed there. It went back to 14+ at
some point but it didn=99t notice it until I was on the ground.
I did tighten the belt before the last flight yesterday thinking it was
slightly loose, but that made no difference.
I=99m back to thinking it must be an intermittent connection that I j
ust
haven=99t found....
Ivan Haecker
On Sun, Feb 26, 2023 at 3:55 PM Charlie England <ceengland7@gmail.com>
wrote:
> ceengland7@gmail.com>
>
> On 2/26/2023 12:35 PM, H. Ivan Haecker wrote:
> > Something is amiss with my charging system. Upon initial start, normal
> > charging voltage occurs. A few minutes into flight, the voltage has
> > dropped to battery only. Upon landing, it=99s back up to normal c
harging
> > voltage. This has occurred on the last three flights. I can=99t f
ind any
> > obvious loose connections and a voltage check with a VOM in flight
> > shows the shipboard volt meter is accurate. So I suppose it is either
> > an alternator or external regulator (ford type) problem. Is there a
> > way in flight to determine which is the culprit? Maybe check the
> > output voltage from the field terminal to the alternator while in
> > flight? Any advice would be appreciated.
> > Ivan Haecker
> >
> Does it instantly drop from 14+V charge voltage to battery voltage, or
> does it decay slowly from charge voltage to battery voltage? (Instant
> drop might indicate a loose connection, though I'd expect an
> intermittent connection issue to come and go within the same flight.
>
> Have you checked your alternator belt for proper tension?
>
> --
> This email has been checked for viruses by Avast antivirus software.
> www.avast.com
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Message 8
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| Subject: | Re: Intermittent Charging |
I just saw the response from =9DRadioflyer=9D and will try that
in a couple of
days when the weather improves (and recheck the connections again).
Ivan Haecker
On Sun, Feb 26, 2023 at 4:00 PM Radioflyer <skyeyecorp@airpost.net> wrote:
> skyeyecorp@airpost.net>
>
> I think the first thing I would do is to connect a temporary extension
> wire from the field wire going directly into the alternator into the
> cabin/cockpit so that you can measure the field Volts. If the field Volts
> are not normal or go too low, then its not the alternator. Bob N. discuss
es
> this in his book (diag. Z-23) and advises putting a 1k Ohm resistor in th
is
> line to limit any shorting potential.
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=510283#510283
>
>
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Message 9
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| Subject: | SD-8 Self Exciting via Z25L |
I am setting up the regulator and components from Z25L for a self exciting SD-8
to support backup power for my second ignition and backup power for the aircraft
E-Bus.
One option is to screw this stuff to an Aluminum plate and let it hang out in the
air - another is to 3D print an enclosure for everything. Question is how much
heat do I have to deal with and what's the fire risk of these components if
I have it running full tilt (not likely in my configuration, but...)
I'm not seeing more than a watt from the resistors if my math is right. How much
heat from the regulator and diode bridge?
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=510289#510289
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