Today's Message Index:
----------------------
1. 03:53 AM - Re: Compatable Shunt (user9253)
2. 09:20 AM - Re: Re: Compatable Shunt (Robert L. Nuckolls, III)
3. 12:37 PM - Re: Re: Compatable Shunt (Carlos W Jazun)
4. 01:03 PM - Re: Compatable Shunt (user9253)
5. 07:07 PM - Re: Re: Compatable Shunt (fedico94@mchsi.com)
6. 07:09 PM - Re: Re: Compatable Shunt (fedico94@mchsi.com)
7. 07:11 PM - Re: Re: Compatable Shunt (Robert L. Nuckolls, III)
Message 1
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| Subject: | Re: Compatable Shunt |
> The G3X manual you refer to lists the calibration procedure for Hall effect sensor
on page 12020. Cn this be used with the Shunt ? I suspect there is no calibration
for the shunt.
I do not know if the calibration procedure is for only Hall Effect sensors or for
both Hall Effect and Shunts. The manual is not clear on this point. You could
ask Garmin support. If there is no calibration procedure for shunts, then
only a +/-50mV, 100amp shunt can be used, if you want the display to be accurate.
Easier than calling Garmin would be to try calibrating per page 12-20. What
do you have to lose except a little time? If it doesn't work, you can reset the
parameters back to default.
Joe
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=384452#384452
Message 2
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| Subject: | Re: Compatable Shunt |
At 05:52 AM 10/2/2012, you wrote:
>
>
> > The G3X manual you refer to lists the calibration procedure for
> Hall effect sensor on page 12020. Cn this be used with the Shunt ?
> I suspect there is no calibration for the shunt.
>
>I do not know if the calibration procedure is for only Hall Effect
>sensors or for both Hall Effect and Shunts. The manual is not clear
>on this point. You could ask Garmin support. If there is no
>calibration procedure for shunts, then only a +/-50mV, 100amp shunt
>can be used, if you want the display to be accurate.
In a customer's airplane, cutting wires and splicing
back requires different levels of inspection than simply
Pushing the pin out of a connector to route a wire
through the hall device.
The AMPLOC hall sensors are really handy. I've used
them many times especially when I needed to measure
current in a wire for which I was discouraged from
doing damage.
Over the years, I developed some tools that offered
a quick-n-dirty access to current-in-the-wire . . .
http://tinyurl.com/8n6fo2n
http://tinyurl.com/8zqqetc
The KEY series AMPLOC devices
http://tinyurl.com/8gtrsru
Are more user friendly for getting electrons-per-second
counted in fat wires.
They do have the disadvantage of needing power to
operate . . . and it must be well regulated since
the output is ratiometric to the supply voltage.
They are bi-directional devices . . . meaning that
zero amps is some value close to 1/2 that of the
applied power. Hence the need for a wide range
of offset programming to move from shunts (zero volts
at zero amps) to hall effect sensors (some volts
at zero amps).
http://tinyurl.com/8suspug
I suspect that the Garmin display value for AMPS is
derived from analog data which is then massaged
for offset and scale factor. Given the extensive references
for 50mv/100A shunts for both wiring and discussion
of AMPS sensing, I'd bet that the default programming
assumes a 50mv/100A shunt. The resolution of their
a/d system would allow the 100A shunt to be used
virtually anywhere . . . even in series with an
SD-8, without adjustment to default offset and
scale factors.
I don't recall if the subject problem was "no reading"
or inaccurate reading. Of course, no reading could be
either wiring error . . . or there's no actual current
flowing to be measured and displayed. Inaccurate reading
could be due to 60A shunt being used without re-calibration
for the higher scale-factor value.
A more detailed study of symptoms and conditions is
called for. I suspect that either of the shunts in
hand will do the job . . . just need to learn the
correct incantation and wave of the wand to get the
hardware's attention.
Bob . . .
Message 3
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| Subject: | Re: Compatable Shunt |
Hello Bob,
Got the book, good job, I'm really enjoying it.
Quick question, how do I un-suscribe from the forum??? I get about 30 email
s an hour! hard to keep up with it.
Thanks
Regards
Walter
-----Original Message-----
From: Robert L. Nuckolls, III <nuckolls.bob@aeroelectric.com>
Sent: Mon, Oct 1, 2012 9:54 pm
Subject: Re: AeroElectric-List: Re: Compatable Shunt
<nuckolls.bob@aeroelectric.com>
At 09:43 PM 10/1/2012, you wrote:
>
>The G3X manual you refer to lists the calibration procedure for Hall
>effect sensor on page 12020. Cn this be used with the Shunt ? I
>suspect there is no calibration for the shunt.
>Thanks for the reference, I have to keep up on the manual revisions
>as they add new devices all the time. After initial test flights I
>will have to update the software as well.
I downloaded the g3x manual. A search of the book
cites 82 instances of the word "shunt" where the
expected device is a 50mv/100A device. There
are also 8 instances of Hall Effect where it appears
you can use AmpLoc KEY100 style sensors.
Paragraph 8.3 speaks to the use of either. I was
unable to find any schematic references to hall
devices. They have 3 wire connections and need a
source of clean power. Also, hall effect sensors
are noted for their variability in both offset
and scale factor . . . they require individual
calibration for accuracy. Shunts are precision,
two wire devices that are very predictable. Suggest
you stay with the 100A shunt.
Bob . . .
Message 4
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| Subject: | Re: Compatable Shunt |
> Of course, no reading could be
> either wiring error . . . or there's no actual current
> flowing to be measured and displayed.
It is too bad that we are so far from the aircraft. It would be fun to do some
troubleshooting in person.
The original posting said that there was zero amperage displayed. And he said
that the 60amp shunt was installed. If anything, the 60 amp shunt should read
higher current than a 100amp shunt.
It would be helpful to know the millivolts across the shunt compared to the millivolts
at the input to the G3X. If those voltages are equal and above zero
and there is no amperage displayed, then the problem is the G3X, perhaps a software
setup problem.
Joe
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=384503#384503
Message 5
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| Subject: | Re: Compatable Shunt |
With the 80 pin (read delicate) connector I am reluctant to pull it. The information
I have from Garmin implies that the G3X will not read unless it has 5 milliohm
resister (rather than 8.3)
Job one is to test fly with voltmeter. andswap out the shunt in the next few weeks.
will recheck wiring tomorrow
----- Original Message -----
From: user9253 <fran4sew@banyanol.com>
Sent: Tue, 2 Oct 2012 15:02:29 -0500 (CDT)
Subject: AeroElectric-List: Re: Compatable Shunt
> Of course, no reading could be
> either wiring error . . . or there's no actual current
> flowing to be measured and displayed.
It is too bad that we are so far from the aircraft. It would be fun to do some
troubleshooting in person.
The original posting said that there was zero amperage displayed. And he said
that the 60amp shunt was installed. If anything, the 60 amp shunt should read
higher current than a 100amp shunt.
It would be helpful to know the millivolts across the shunt compared to the millivolts
at the input to the G3X. If those voltages are equal and above zero
and there is no amperage displayed, then the problem is the G3X, perhaps a software
setup problem.
Joe
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=384503#384503
Message 6
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| Subject: | Re: Compatable Shunt |
The readout has a red "X" through it meaning inoperable, no scale is displayed
----- Original Message -----
From: user9253 <fran4sew@banyanol.com>
Sent: Tue, 2 Oct 2012 15:02:29 -0500 (CDT)
Subject: AeroElectric-List: Re: Compatable Shunt
> Of course, no reading could be
> either wiring error . . . or there's no actual current
> flowing to be measured and displayed.
It is too bad that we are so far from the aircraft. It would be fun to do some
troubleshooting in person.
The original posting said that there was zero amperage displayed. And he said
that the 60amp shunt was installed. If anything, the 60 amp shunt should read
higher current than a 100amp shunt.
It would be helpful to know the millivolts across the shunt compared to the millivolts
at the input to the G3X. If those voltages are equal and above zero
and there is no amperage displayed, then the problem is the G3X, perhaps a software
setup problem.
Joe
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=384503#384503
Message 7
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| Subject: | Re: Compatable Shunt |
At 02:36 PM 10/2/2012, you wrote:
>Hello Bob,
>
>Got the book, good job, I'm really enjoying it.
>
>Quick question, how do I un-suscribe from the forum??? I get about
>30 emails an hour! hard to keep up with it.
>
>Thanks
>
>Regards
>
>Walter
30 an hour? I don't think I get 30 a day. In
any case, they're very easy to delete if the topic is
uninteresting to you. I have submitted an
un-subscription request. When it arrives in
your email, click on the link within the e-mail
to confirm your request.
Bob . . .
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