Today's Message Index:
----------------------
1. 04:29 AM - Re: Alternator Aux (Robert L. Nuckolls, III)
2. 06:44 AM - Re: G3i Ignition ()
3. 08:37 AM - Re: Alternator Aux (rckol)
4. 11:17 AM - Re: Molex - AMP "Mate-n-Lock" pin extraction tool (rampil)
5. 05:52 PM - Re: Re: Molex - AMP "Mate-n-Lock" pin extraction tool (Robert L. Nuckolls, III)
6. 05:54 PM - Re: Re: Alternator Aux (Robert L. Nuckolls, III)
Message 1
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| Subject: | Re: Alternator Aux |
At 09:14 PM 4/15/2009, you wrote:
>
>I am considering the use of the PlanePower regulator to control a
>SD-20 alternator. The regulator provides an Aux input that monitors
>for low voltage (or no voltage due to crowbar trip), but I am told
>by PlanePower that the expected input for low voltage monitoring is
>a half voltage (0-7 volt) output from an alternator.
>
>I don't see any such output on the SD-20. Would it be reasonable to
>produce this half voltage with a simple voltage divider made from a
>pair of identical resistors between the bus voltage and ground or is
>there more to this than I am seeing?
You're going to have to has the designer of
the regulator about that. It sounds like their
regulator is designed to exploit the old
"S" terminal that used to grace the back of
many alternators.
The "S" lead was connected to the center
junction of a wye-connected stator winding
and under normal operations this lead produced
an output about 1/2 of system voltage when
the alternator was being turned by the engine.
This output was often used to pull in a relay
that closed the field supply circuit to the
regulator. This feature provided automatic
disconnect of the field when the engine was
stopped. This was a automatic disabling of
the field supply that would prevent an unnecessary
drain on the battery.
I'm mystified as to why they would offer such
a regulator. A few alternator designs on
Wichita piston aircraft had "S" terminals
but to my knowledge, that terminal was never
used as a source for powering an excitation
control relay. I used to build a voltage
sensor that would annunciate a failed
alternator by monitoring the "S" terminal
bit I don't recall it being used any
other way.
I'm thinking the "S" terminal has all
but disappeared from modern alternator
offerings.
Assuming that my hypothesis for their
inclusion of this connection is correct . . .
and assuming further that the regulator
is needing to see this voltage just
to "come alive" then your voltage divider
suggestion may be fine. Or perhaps it just
needs to be jumpered to the field supply
input terminal.
You'll need to ask them about that. Certainly
their STC list speaks to a ton of aircraft
that will not have an alternator fitted with
"S" terminals so they'll have to do something
with that input to the alternator.
Bob . . .
----------------------------------------)
( . . . a long habit of not thinking )
( a thing wrong, gives it a superficial )
( appearance of being right . . . )
( )
( -Thomas Paine 1776- )
----------------------------------------
Message 2
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Bakerocb,
This is basically the same mod that has been available for hot rods for
the last 30 years. Better, hotter, faster and lots of other marketing
hype. I've not tried them on Lycomings, but they've helped one or more
of my projects that suffered from frequently wet distributors, cheap
wires etc. One bonus is that it should improve fuel burn.
I just got done spending 4k on my EI from Lightspeed. I'll need to wait
to upgrade.
Glenn
-----Original Message-----
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of
bakerocb@cox.net
Sent: Wednesday, April 15, 2009 9:18 PM
Subject: AeroElectric-List: G3i Ignition
4/15/200
Hello Fellow Builders, I was just introduced to G3i ignition. See here:
http://www.g3ignition.com/
I am wondering if any fellow listers have any field experience with this
system or comments regarding the concept and implementation.
Thanks.
'OC' Says: "The best investment we can make is the effort to gather and
understand knowledge."
Message 3
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| Subject: | Re: Alternator Aux |
Thanks Bob,
>From what I was told, the Aux terminal does nothing but monitor voltage and control
the low voltage/overvoltage lamp. So it sounds like it works similar to
your voltage sensor that you mention.
This regulator is intended to replace whole catalogs of other regulators, so it
probably something provided just for those that use it, although the function
has apparently changed somewhat.
If there is no Aux output on the alternator and a voltage warning light is used,
the instructions are to jumper the Aux terminal to the field control terminal.
In this case, it will only signal an overvoltage condition (after the field
breaker is crowbarred). Since the voltage it is looking for is in the neighborhood
of 6-7 volts, it is cannot provide a low voltage indication in this configuration
(until it is way too late).
I will check with them.
--------
rck
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=239528#239528
Message 4
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| Subject: | Re: Molex - AMP "Mate-n-Lock" pin extraction tool |
Hi Bob,
Sometimes your mileage may vary!
I used the AMP frame and the specified dies. One wire once pulled out
under minimal strain(and I will take the hit for that!), in the other cases,
the wire/connection pin or socket just backed out of the plastic.
Given the pain in the neck that repairing finished connectors in an airframe
can be, I chose to invest in a higher quality part which mostly translates to AMP
CPC connectors
Ira
--------
Ira N224XS
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=239562#239562
Message 5
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| Subject: | Re: Molex - AMP "Mate-n-Lock" pin extraction |
tool
At 01:16 PM 4/16/2009, you wrote:
>
>Hi Bob,
>
>Sometimes your mileage may vary!
>
>I used the AMP frame and the specified dies. One wire once pulled out
>under minimal strain(and I will take the hit for that!), in the other cases,
>the wire/connection pin or socket just backed out of the plastic.
>
>Given the pain in the neck that repairing finished connectors in an airframe
>can be, I chose to invest in a higher quality part which mostly
>translates to AMP CPC connectors
Hmmmm . . . can you send me your tool, some pins and
the connectors you're working with? Something doesn't
add up here. AMP has been in business for a very long
time and they seldom stub their toe . . . especially
on a legacy product of some 40+ years.
Bob . . .
----------------------------------------)
( . . . a long habit of not thinking )
( a thing wrong, gives it a superficial )
( appearance of being right . . . )
( )
( -Thomas Paine 1776- )
----------------------------------------
Message 6
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| Subject: | Re: Alternator Aux |
At 10:35 AM 4/16/2009, you wrote:
>
>Thanks Bob,
>
> >From what I was told, the Aux terminal does nothing but monitor
> voltage and control the low voltage/overvoltage lamp. So it
> sounds like it works similar to your voltage sensor that you mention.
>
>This regulator is intended to replace whole catalogs of other
>regulators, so it probably something provided just for those that
>use it, although the function has apparently changed somewhat.
>
>If there is no Aux output on the alternator and a voltage warning
>light is used, the instructions are to jumper the Aux terminal to
>the field control terminal.
Okay, that makes sense.
> In this case, it will only signal an overvoltage condition (after
> the field breaker is crowbarred). Since the voltage it is looking
> for is in the neighborhood of 6-7 volts, it is cannot provide a low
> voltage indication in this configuration (until it is way too late).
Don't know about the "too late" idea. Using the
aux terminal on an alternator for ANY purpose other
than the original intent of controlling field
excitation is a stretch of design goals.
LV warning should be independent of the regulator
function and have nothing to do with connections
to the alternator. This is how it works in the B&C
regulators. If the regulator you're considering
is NOT fitted with a 13.0 volt threshold LV sensor
then you'll need an external lv monitoring device.
The feature you're wrestling with was never intended
to provide that functionality with precision.
Bob . . .
----------------------------------------)
( . . . a long habit of not thinking )
( a thing wrong, gives it a superficial )
( appearance of being right . . . )
( )
( -Thomas Paine 1776- )
----------------------------------------
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