Today's Message Index:
----------------------
1. 05:27 AM - Re: Over Voltage Protection for Internal Regulated Alternators (Bubblehead)
2. 05:49 AM - TXDR & Nav/Com light sensors (Stuart Hutchison)
3. 01:06 PM - Flap control using (a) relay(s) (pmnewlon)
4. 01:50 PM - Re: Flap control using (a) relay(s) (Larry Mac Donald)
5. 02:03 PM - Re: Flap control using (a) relay(s) (B Tomm)
6. 02:13 PM - Re: Flap control using (a) relay(s) (ROGER & JEAN CURTIS)
7. 02:16 PM - Re: Flap control using (a) relay(s) (pmnewlon)
8. 04:11 PM - Re: Flap control using (a) relay(s) (Robert L. Nuckolls, III)
9. 04:14 PM - Re: Re: Over Voltage Protection for Internal Regulated Alternators (Robert L. Nuckolls, III)
10. 04:15 PM - Re: TXDR & Nav/Com light sensors (Robert L. Nuckolls, III)
11. 08:43 PM - Drawing Z-13/20 (Paul Zimmer)
Message 1
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| Subject: | Re: Over Voltage Protection for Internal Regulated |
Alternators
I agree and understand the ANL has nothing to do with OV protection.
Where would I find information on going "inside the alternator and modify it in
the same manner that Plane-Power does so that you have EXTERNAL control of the
field supply conductor while retaining use of the internal regulator. "
--------
John
Keller, TX
RV-8 N247TD
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=346876#346876
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| Subject: | TXDR & Nav/Com light sensors |
G'day Bob,
We have a KT76C transponder, a KX-165 and a KX155 radio in our Club Piper
Archer - all with gas discharge displays.
At night they're all unreadable, but display just fine in daylight or if a
torch is aimed at the light sensor (I assume an SPD like a camera light
sensor).
Before we head out to potentially get ripped off buying new circuit boards
or refurbished units etc, do you know if this is a common problem and should
it be a relatively easy fix?
Cheers, Stu
Message 3
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| Subject: | Flap control using (a) relay(s) |
I have two rows of SPST switches on the lower left of my instrument panel. I failed
to allow enough room for the DPDT flap switch and now either have to relocate
it or figure out some way to operate the flaps with the SPST (ON)OFF(ON)
switch I purchased for the job. I've looked at Newark Elec for some kind of
relay to do the job, but I can only think of how to do it using two SPST relays
such as the B/C 704-1 - one for 'UP' the other for 'DOWN'. I would appreciate
any thoughts on how to gracefully recover from my design error.
Thanks!
Phil
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=346914#346914
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| Subject: | Re: Flap control using (a) relay(s) |
Phil,
You could do that job with what is called a "Latching relay"
Larry
On Jul 18, 2011, at 4:02 PM, pmnewlon wrote:
>
> I have two rows of SPST switches on the lower left of my instrument panel. I
failed to allow enough room for the DPDT flap switch and now either have to relocate
it or figure out some way to operate the flaps with the SPST (ON)OFF(ON)
switch I purchased for the job. I've looked at Newark Elec for some kind of
relay to do the job, but I can only think of how to do it using two SPST relays
such as the B/C 704-1 - one for 'UP' the other for 'DOWN'. I would appreciate
any thoughts on how to gracefully recover from my design error.
>
> Thanks!
>
> Phil
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=346914#346914
>
>
>
>
>
>
>
>
>
>
>
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Message 5
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| Subject: | Flap control using (a) relay(s) |
You could add a flap controller such as what Vans sells. Has few nice
features.
Bevan
-----Original Message-----
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of pmnewlon
Sent: Monday, July 18, 2011 1:03 PM
Subject: AeroElectric-List: Flap control using (a) relay(s)
I have two rows of SPST switches on the lower left of my instrument panel.
I failed to allow enough room for the DPDT flap switch and now either have
to relocate it or figure out some way to operate the flaps with the SPST
(ON)OFF(ON) switch I purchased for the job. I've looked at Newark Elec for
some kind of relay to do the job, but I can only think of how to do it using
two SPST relays such as the B/C 704-1 - one for 'UP' the other for 'DOWN'.
I would appreciate any thoughts on how to gracefully recover from my design
error.
Thanks!
Phil
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=346914#346914
Message 6
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| Subject: | Flap control using (a) relay(s) |
I have two rows of SPST switches on the lower left of my instrument
panel.
I failed to allow enough room for the DPDT flap switch and now either
have
to relocate it or figure out some way to operate the flaps with the SPST
(ON)OFF(ON) switch I purchased for the job. I've looked at Newark Elec
for
some kind of relay to do the job, but I can only think of how to do it
using
two SPST relays such as the B/C 704-1 - one for 'UP' the other for
'DOWN'.
I would appreciate any thoughts on how to gracefully recover from my
design
error.
Thanks!
Phil
A simple way is to use two dpst automotive relays, one wired
for flaps up and the other for flaps down, then simply control them with
your installed spdt switch.
Roger
Message 7
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| Subject: | Re: Flap control using (a) relay(s) |
Hmmmm, from what I read of the description of one such relay on the newark site,
a latching relay stays in the last position until power is applied in the other
direction. I would need a '3 position' relay - up, no power, down.
"Magnetic Latching relays require one pulse of coil power to move their contacts
in one direction, and another, redirected pulse
to move them back. Repeated pulses from the same input have no effect. Magnetic
Latching relays are useful in applications
where interrupted power should not be able to transition the contacts."
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=346927#346927
Message 8
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| Subject: | Re: Flap control using (a) relay(s) |
At 03:02 PM 7/18/2011, you wrote:
>
>I have two rows of SPST switches on the lower left of my instrument
>panel. I failed to allow enough room for the DPDT flap switch and
>now either have to relocate it or figure out some way to operate the
>flaps with the SPST (ON)OFF(ON) switch I purchased for the
>job. I've looked at Newark Elec for some kind of relay to do the
>job, but I can only think of how to do it using two SPST relays such
>as the B/C 704-1 - one for 'UP' the other for 'DOWN'. I would
>appreciate any thoughts on how to gracefully recover from my design error.
Using the pair of relays as shown in
http://www.aeroelectric.com/PPS/Flight/Flaps/Flaps_3.pdf
is about a graceful as it gets. With both relays de-energized,
their relaxed contacts put a dead short on the motor bringing
it to a fast halt. The relays are inexpensive . . .
Emacs!
This model comes with it's own mounting bracket.
http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=255-2729-ND
Bob . . .
Message 9
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| Subject: | Re: Over Voltage Protection for Internal Regulated |
Alternators
At 07:23 AM 7/18/2011, you wrote:
>
>I agree and understand the ANL has nothing to do with OV protection.
>
>Where would I find information on going "inside the alternator and
>modify it in the same manner that Plane-Power does so that you have
>EXTERNAL control of the field supply conductor while retaining use
>of the internal regulator. "
Hmmmm . . . there was a set of instructions unique to a
particular series of ND alternators that spoke to
removing the built-in regulator and converting it
to external (a-la B&C L-series). But I've not seen
anything that shows how to leave it in.
It's something an alternator repair shop might
be able to help you with.
Bob . . .
Message 10
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| Subject: | Re: TXDR & Nav/Com light sensors |
At 07:47 AM 7/18/2011, you wrote:
>G'day Bob,
>
>We have a KT76C transponder, a KX-165 and a KX155 radio in our Club
>Piper Archer - all with gas discharge displays.
>
>At night they're all unreadable, but display just fine in daylight
>or if a torch is aimed at the light sensor (I assume an SPD like a
>camera light sensor).
>
>Before we head out to potentially get ripped off buying new circuit
>boards or refurbished units etc, do you know if this is a common
>problem and should it be a relatively easy fix?
>
I'm sorry, I've not had any experience or insight
from others as to how you might deal with this
issue. Suggest you post it to the list. Somebody
might have more knowledge than I.
Bob . . .
Message 11
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Forget my question (if you haven't done so already) regarding why Z-13/20
went away with Revision 12 of AEC. I found my answer. I'm getting this
Matronics Email-Serve thing figured out (i.e. search - Duh!). You must have
the patience of Job, being asked the same question over and over.
That said, I did an analysis of Z-12, and it is quite similar to Z-13/20
with a few notable exceptions. I have a couple of questions and
observations regarding Z-12.
The field for both alternators is fed from the main bus. If the Aux
alternator field was fed from the E-Bus, it would provide battery current
should the Battery Contactor Fail (however unlikely), with no apparent
downside to the overall design, other than the E-Bus alternate feed would
need to be switched on. Am I reading this right, or is there more to it?
This brings up a more basic question.
What is the intended normal operating position of the E-Bus Alternate Feed
Switch? It would seem that it could be operated in the "On" position
(enabled to provide battery power "when" the battery contactor fails) or Off
position (requiring it to be turned on "when" the contactor fails).
The Z-12 design powers both the main and E-Bus from both alternators. Does
this assume the pilot will shed load (if necessary) from the main bus
necessary to stay below the output of the backup alternator in order to save
the battery, until those devices are required for approach and landing?
Bob, I'm sure you know that when we ask these questions, it's because
(hopefully) we are thinking, which is a good thing. I'm sure you're beyond
taking challenges/questioning of your designs personally. I for one really
appreciate you taking the time to answer questions and being here to
educate.
Thanks
Paul
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