Today's Message Index:
----------------------
1. 05:10 AM - Re: Jabiru Alternator/Regulator OVM Problem (Robert Feldtman)
2. 07:39 AM - Garmin 296 hard wire (wypaul)
3. 08:38 AM - Re: Garmin 296 hard wire (Robert L. Nuckolls, III)
4. 11:44 AM - S2-Servo (Paul McAllister)
5. 01:30 PM - Z13/8 Aux Alternator Fuselink (Jeff Page)
6. 03:59 PM - Re: S2-Servo (Bill)
7. 04:11 PM - Re: S2-Servo (Robert Feldtman)
8. 05:37 PM - Re: S2-Servo (Charlie England)
9. 05:49 PM - S2 Swevo Navaid (Jim Wickert)
10. 08:13 PM - Re: Z13/8 Aux Alternator Fuselink (Robert L. Nuckolls, III)
Message 1
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| Subject: | Re: Jabiru Alternator/Regulator OVM Problem |
I found the small 3A fuse in the voltage sample line to be loose,
intermittently allowing for a break in the circuit, this too "low" a
voltage, thus the VR would allow the voltage to rise intermittently which
would of course pop the OV circuit breaker. The cheap 3 A fust holder was
removed, and I put another 3 A in line fuse holder in place which stays
snug. problem fixed
bobf
On Sat, Sep 20, 2008 at 10:35 PM, Michael Forhan <ohioip@yahoo.com> wrote:
>
> I am running a Jabiru 2200 with about 60 hours. I have the B&C "crowbar"
> overvoltage module ("OVM") installed and it has been fine until today.
>
> Today I flew for about half an hour. When I throttled back to about 2400
> RPM for descent the 5A circuit breaker began tripping. No problems were
> noted at cruise RPM and idle/taxi RPM.
>
> There were no changes in the load on the electrical system--it's a basic
> VFR setup with only a COM radio and engine gauges on the DC bus.
>
> The analog panel voltmeter is reading about 14 VDC with the breaker in, but
> of course that would not provide any indication of transients that might be
> tripping the OVM.
>
> I'm suspecting the regulator--I previously posted here about problems with
> an unstable VDO tach reading with the tach input connected to an alternator
> lead. Perhaps the problems are related.
>
> Before I start digging into the electrical system, has anyone else seen a
> similar problem or have any suggestions?
>
> Thanks!
>
>
Message 2
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| Subject: | Garmin 296 hard wire |
I purchased an automotive charging cable that I plan to use to hard wire my 296
to my plane. When I opened the cigarette lighter end there was a small, square
ceramic in series with the positive lead. What is the function of this component?
I use a small power jack in place of the cigarette lighter so I guess
it is not really hard wired and would like to get rid of the extra bulk.
Paul Spackman
--------
Paul Spackman
Q-2 Jabiru 3300
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p 5364#205364
Message 3
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| Subject: | Re: Garmin 296 hard wire |
At 07:37 AM 9/21/2008 -0700, you wrote:
>
>I purchased an automotive charging cable that I plan to use to hard wire
>my 296 to my plane. When I opened the cigarette lighter end there was a
>small, square ceramic in series with the positive lead. What is the
>function of this component? I use a small power jack in place of the
>cigarette lighter so I guess it is not really hard wired and would like to
>get rid of the extra bulk.
>Paul Spackman
If it's a single, two-lead ceramic component, my best GUESS is
a "Polyswitch". It's a sort of self-resetting circuit breaker.
Here's a extensive description of these critters:
http://en.wikipedia.org/wiki/Polyswitch
For your purposes, an upstream fuse on the order of 2A or
less would serve the same purpose. Having your accessory
power jack fused at the bus is always a good thing.
Bob . . .
----------------------------------------)
( . . . a long habit of not thinking )
( a thing wrong, gives it a superficial )
( appearance of being right . . . )
( )
( -Thomas Paine 1776- )
----------------------------------------
Message 4
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Hi All,
I was wondering if anyone happened to know where the S2 Servo that Naviad use is
sourced from. Trio seem to use a very similar servo in their product, perhaps
it is the same unit,
Anyhow, if anyone happens to know where these are sourced from I'd appreciate an
heads up.
Thanks, Paul
Message 5
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| Subject: | Z13/8 Aux Alternator Fuselink |
There have been discussions here that the B&C SD-8 alternator can
perhaps put out as much as 10A under some conditions.
The wiring shown for it in Z13/8 is 14awg which matches the wire size
charts for 10A.
The Book indicates 4 awg sizes smaller for fuselinks, yet the fuselink
shown for the SD-8 alternator at the main battery contactor is only
20awg.
The same 14awg with 20awg fuselink combination is shown for the
connection from the Endurance bus to the Alternate Feed relay.
Should the fuselinks be 18 awg ?
Thanks !
Jeff Page
Dream Aircraft Tundra #10
Message 6
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Me also, and or any servo that will work with the navaid head.
Bill
----- Original Message -----
From: Paul McAllister
To: aeroelectric-list@matronics.com
Sent: Sunday, September 21, 2008 1:42 PM
Subject: AeroElectric-List: S2-Servo
Hi All,
I was wondering if anyone happened to know where the S2 Servo that
Naviad use is sourced from. Trio seem to use a very similar servo in
their product, perhaps it is the same unit,
Anyhow, if anyone happens to know where these are sourced from I'd
appreciate an heads up.
Thanks, Paul
-------------------------------------------------------------------------
-----
Checked by AVG - http://www.avg.com
9/21/2008 10:10 AM
Message 7
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check with trio - their's probably will. they have been very helpful
bobf
On Sun, Sep 21, 2008 at 5:57 PM, Bill <docyukon@ptcnet.net> wrote:
> Me also, and or any servo that will work with the navaid head.
> Bill
>
> ----- Original Message -----
> *From:* Paul McAllister <l_luv2_fly@yahoo.com>
> *To:* aeroelectric-list@matronics.com
> *Sent:* Sunday, September 21, 2008 1:42 PM
> *Subject:* AeroElectric-List: S2-Servo
>
> Hi All,
>
> I was wondering if anyone happened to know where the S2 Servo that Naviad
> use is sourced from. Trio seem to use a very similar servo in their
> product, perhaps it is the same unit,
>
> Anyhow, if anyone happens to know where these are sourced from I'd
> appreciate an heads up.
>
> Thanks, Paul
>
> *
>
> href="http://www.matronics.com/Navigator?AeroElectric-List">http://www.matronics.com/Navigator?AeroElectric-List
> href="http://forums.matronics.com">http://forums.matronics.com
> href="http://www.matronics.com/contribution">http://www.matronics.com/c*
>
> ------------------------------
> - - Release Date: 9/21/2008 10:10 AM
>
> *
>
> *
>
>
Message 8
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I can verify that. I bought a used Navaid & then discovered that they
were out of business. Trio says that they can modify their current servo
to work with the navaid head. Trio bought servos from Navaid until they
came up with their own 'smart' servo.
Charlie
Robert Feldtman wrote:
>
> check with trio - their's probably will. they have been very helpful
>
> bobf
>
>
> On Sun, Sep 21, 2008 at 5:57 PM, Bill <docyukon@ptcnet.net
> <mailto:docyukon@ptcnet.net>> wrote:
>
> Me also, and or any servo that will work with the navaid
> head. Bill
>
> ----- Original Message -----
> *From:* Paul McAllister <mailto:l_luv2_fly@yahoo.com>
> *To:* aeroelectric-list@matronics.com
> <mailto:aeroelectric-list@matronics.com>
> *Sent:* Sunday, September 21, 2008 1:42 PM
> *Subject:* AeroElectric-List: S2-Servo
>
> Hi All,
>
> I was wondering if anyone happened to know where the S2 Servo
> that Naviad use is sourced from. Trio seem to use a very
> similar servo in their product, perhaps it is the same unit,
>
> Anyhow, if anyone happens to know where these are sourced from
> I'd appreciate an heads up.
>
> Thanks, Paul
>
Message 9
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I believe you find this is packaged by Navaid and that it is a Micro Stepper Motor
with a Micro chopper to give the count control and positioning that is packaged
by them. Much like most of the Trim and altitude hold supplier (they will
use a stepper motor and a chopper circuit). The key is to design the control
circuit, the reduction graring and the brake. A lot of work for one off.
VOE!!!
Jim Wickert
Vision #159
Message 10
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| Subject: | Re: Z13/8 Aux Alternator Fuselink |
At 04:28 PM 9/21/2008 -0400, you wrote:
>
>There have been discussions here that the B&C SD-8 alternator can
>perhaps put out as much as 10A under some conditions.
>
>The wiring shown for it in Z13/8 is 14awg which matches the wire size
>charts for 10A.
Depending on the chart . . . 14AWG is good for 15A in
a 10C rise design . . . see below . . .
>The Book indicates 4 awg sizes smaller for fuselinks, yet the fuselink
>shown for the SD-8 alternator at the main battery contactor is only
>20awg.
>
>The same 14awg with 20awg fuselink combination is shown for the
>connection from the Endurance bus to the Alternate Feed relay.
>
>Should the fuselinks be 18 awg ?
No, current ratings for any given size of wire is
dependent upon the TEMPERATURE RISE you're willing
to tolerated along with VOLTAGE DROP you're willing
to tolerate. The wire tables like those shown in
http://aeroelectric.com/articles/Rev11/Ch8_R12.pdf
are crafted for a 10C rise above ambient.
In the case of using wire for fusible links, the
fusible part is short . . . so it contributes little
to overall voltage drop. We allow it to run a bit
hotter to keep the wire size as small as practical
(faster acting fuse for hard faults). In the cases
you cited, 20AWG is at least 4 AWG steps smaller than
14, in fact it's 6 steps for an even faster fusing
characteristic. Actually, you COULD use 22AWG for
this fusible link if you wanted. See:
http://aeroelectric.com/Pictures/Wire/22AWG_20A.pdf
In this picture, we see a length of 22AWG wire in
the foreground with a thermocouple attached. The
wire has been carrying 20 amps for the last 30
minutes or so (temperature has stabilized). Note
that the surface temperature of the wire is only
111C . . . we COULD run another 40C hotter without
pushing this wire's insulation. 10A would drop
the rise by about 1/2 down to about 85C. Even
better yet.
Fusible link fabrication is a special case that
ignores (but does not abuse) the rules we use
for sizing wire in bundles to carry power around
the airplane.
Bob . . .
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