Today's Message Index:
----------------------
1. 05:45 AM - Re: Thermocouple wire (Harley)
2. 07:03 AM - Re: RV-List: Engine Kick-Back IO-360 (Larry Mac Donald)
3. 04:39 PM - Re: Transorbs for Lancair Flap Actuator... (Eric M. Jones)
4. 08:39 PM - Noise filter noise (James Redmon)
Message 1
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| Subject: | Re: Thermocouple wire |
Message 2
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| Subject: | Re: RV-List: Engine Kick-Back IO-360 |
--> AeroElectric-List message posted by: Larry Mac Donald <lm4@juno.com>
Now here is a problem I've never heard of before.
Does anyone else have this problem and can it be
resolved without changing out starters ?
Larry Mac Donald
lm4@juno.com
Rochester N.Y.
Do not achcive
On Sat, 26 Aug 2006 11:04:12 -0500 "J. R. Dial" <jrdial@hal-pc.org>
writes:
> --> RV-List message posted by: "J. R. Dial" <jrdial@hal-pc.org>
>
> I did not break a starter but the inrush current to the
> permanent magnet starter I had dropped my voltage low enough that it
> was
> below the compliance voltage for the electronic ignition. I changed
> it
> out for a wound field starter and the problem was solved.
> If you want to know brand names etc. email me off list.
>
> DO NOT ARCHIVE
Message 3
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| Subject: | Re: Transorbs for Lancair Flap Actuator... |
--> AeroElectric-List message posted by: "Eric M. Jones" <emjones@charter.net>
> What size Transorb or MOV would be suitable for the flap motor on a Lancair ES
? They use an "FL1" 12v (or 24v) "linear actuator", Aircraft Spruce part # 05-66223
.....
>
> Lancair provided the flap actuator, limit switches, and Omrom 12vdc relays. I'm
still using the "factory standard" schematic, but it doesn't utilize diodes
or MOV's to protect the switches or relays. The flap motor is a pretty healthy
size motor, I'm guessing the amp draw is around 8 or 10 amps.
>
> The Lancair schematic shorts the two terminals of the flap motor together
> when the flap is not in operation. This acts as an electronic brake
> and noticeably minimizes any tendency to "coast".
>
> If I wanted to add a transorb - would I just wire it in parallel with the motor
leads? What size would I use? (Mine is a 12v system, but others have the 24v
model.) Thanks, Greg
Greg,
Transient supressors are installed so as to shunt the inductive coil in a relay
or motor, and also to shunt to ground the positive leads on bidirectional motors.
The SnapJack suppressors on my website are fine and I show the places to
mount them. For 24-28V systems us 600 mA 36V bidirectional transorbs.
--------
Eric M. Jones
www.PerihelionDesign.com
113 Brentwood Drive
Southbridge, MA 01550
(508) 764-2072
emjones@charter.net
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=57844#57844
Message 4
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| Subject: | Noise filter noise |
--> AeroElectric-List message posted by: "James Redmon" <james@berkut13.com>
An update to the noise issues:
Well, in short, the noise problems are solved. The test flights showed that
the filter disrupted the PWM signal to the extent that it was un-flyable.
So, the quick fix "filter" solution was not possible.
I tried various combinations of grounds and power and the only combination
that eliminated the noise was feeding the unit directly from the battery and
grounding it only to the battery as well. This meant isolating the unit's
mounting so that it did not touch a ground in the front of the plane
(battery is in the back).
So, with this combination required tearing the plane apart to install
dedicated lines (all out of spares), but at least all systems are functional
and quite happy with one another. The one combination I didn't try was to
install the filter on the intercom or audio circuit itself. I figured I'd
take the simplest route to solve the problem as protecting the audio may
have opened the door to at least 6 different sources (2 coms, audio panel,
intercom, engine monitor, etc.). Yikes!
Moral: if you are still building, do yourself a favor and pre-installed
triple the number of fore-aft wires that you think you need - you'll run our
of spares before you know it. ;-)
Anyway, the AP tracks dead-nuts-straight-on...and no noise to boot. All
smiles here...despite the bloody knuckles and pricked fingers.
Thanks to those offering explanations and ideas. I learned a lot on this
one.
James Redmon
Berkut #013 N97TX
http://www.berkut13.com
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