Today's Message Index:
----------------------
1. 03:49 AM - GTX-33 Installation Manual (fasilpereira)
2. 08:43 AM - Re: Alternator Ground (AdventureD)
3. 09:05 AM - Re: GTX-33 Installation Manual (user9253)
4. 09:50 AM - Re: GTX-33 Installation Manual (fasilpereira)
5. 01:22 PM - OV relay and crowbar (Dan Ballin)
6. 01:58 PM - Re: OV relay and crowbar (Jeff Luckey)
7. 02:12 PM - Re: OV relay and crowbar (Charlie England)
8. 02:16 PM - Re: OV relay and crowbar (Charlie England)
9. 02:21 PM - Re: OV relay and crowbar (user9253)
10. 02:41 PM - Re: Re: OV relay and crowbar (Charlie England)
11. 04:55 PM - Re: OV relay and crowbar (user9253)
12. 07:57 PM - Antenna Ground Planes (AdventureD)
13. 08:38 PM - Re: Antenna Ground Planes (user9253)
Message 1
| INDEX | Back to Main INDEX |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | GTX-33 Installation Manual |
I'm looking for the GTX-33 Installation Manual. Could anybody send me a copy of
it to fasilpereira(at)yahoo(dot)com
Thank you,
Fabricio
--------
Fabricio Pereira
Engineer / Pilot
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=500244#500244
Message 2
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: Alternator Ground |
[/quote]
Correct. Both starter and alternator seek
ground through their attachments to the
engine. That fat/flexible jumper from
crankcase to firewall ground stud is
really important.
Further, this alternator has a 2-terminal
field connection. One of those terminals
should be grounded to alternator case.
Bob . . .[/quote]
Interesting. I had simultaneously contacted Continental (It's an IO550), and they
said to run a ground wire from a screw holding the (??alternator brush"")
to the case. But if the alternator is already grounded via attachment to the
case, why would that be needed? They did not mention grounding the second field
terminal to the case. So now I'm confused :(
Separately, the SD20 backup alternator field also has two leads and it takes a
connector that I either lost or was not supplied with the alternator. (See attached
pic). Anyone know where I can get that two lead connector? Maybe an auto
parts shop? And does one of those wires ground to the alternator case?
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=500246#500246
Attachments:
http://forums.matronics.com//files/alternator_field_connection_115.jpg
Message 3
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: GTX-33 Installation Manual |
Installation Manual
http://www.aeroelectric.com/Installation_Data/Garmin/GTX%203X5%20Install%20Manual%20REV%205.pdf
Maintenance Manual
http://static.garmin.com/pumac/190-00734-11_07.pdf
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=500247#500247
Message 4
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: GTX-33 Installation Manual |
Thank you Joe!
Fabricio
--------
Fabricio Pereira
Engineer / Pilot
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=500248#500248
Message 5
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | OV relay and crowbar |
I have an internally regulated Denso alternator on a Carbon Cub. I'd
like some sort of OV protection and was looking at installing a
Crowbar and OV relay. My question is do I need the relay? If I
install the OV module (crowbar) on the Field wire (and ground), seems
like when the voltage spiked, I'd cut the field current and hence the
alternator output. Am I missing something???
Dan Ballin
Message 6
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: OV relay and crowbar |
Dan,
As you may already know, the Crowbar circuit is intended to blow the circui
t breaker that feeds the regulator.=C2- The Crowbar fires, shorts the 5 a
mp breaker to ground, pops the breaker and thus turns-off the regulator/alt
ernator.
What you are suggesting is interesting but will the field circuit in your r
egulator tolerate being shorted to ground for a long period of time?
-Jeff
On Friday, January 15, 2021, 01:34:52 PM PST, Dan Ballin <dballin@gmail
.com> wrote:
I have an internally regulated Denso alternator on a Carbon Cub.=C2- I'd
like some sort of OV protection and was looking at installing a
Crowbar and OV relay.=C2- My question is do I need the relay?=C2- If I
install the OV module (crowbar) on the Field wire (and ground), seems
like when the voltage spiked, I'd cut the field current and hence the
alternator output.=C2- Am I missing something???
Dan Ballin
-
S -
WIKI -
-
=C2- =C2- =C2- =C2- =C2- -Matt Dralle, List Admin.
Message 7
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: OV relay and crowbar |
On 1/15/2021 3:17 PM, Dan Ballin wrote:
>
> I have an internally regulated Denso alternator on a Carbon Cub. I'd
> like some sort of OV protection and was looking at installing a
> Crowbar and OV relay. My question is do I need the relay? If I
> install the OV module (crowbar) on the Field wire (and ground), seems
> like when the voltage spiked, I'd cut the field current and hence the
> alternator output. Am I missing something???
> Dan Ballin
Hi Dan,
Unfortunately, yes.
Most IR alternators place the regulator between the 'ground end' of the
field winding and the ground itself. The 'high side' of the field
winding is tied to the B lead output. That means that if the regulator's
final 'output' transistor fails shorted, or any of the drive circuitry
in the regulator fails in a manner that drives the output transistor to
full conduction, there is no control over the alternator's output.
The 'field' terminal on IR alternators is not a positive (meaning
'certain') control; think of it as more of a 'suggestion box' to the
regulator. It is not connected directly to the field winding.
So if you want positive control over the B lead output, you need the
relay. There are internal mods you can do to the alternator to allow
positive control, if you are motivated and are willing to develop the
required skills. While I have the requisite skill-set, my personal
preference for my IR alternator is to just use a B lead relay; this
allows for quick/easy swap-out of the alternator, sourced from a
convenient auto parts store, if I have a failure while away from home.
Charlie
--
This email has been checked for viruses by Avast antivirus software.
https://www.avast.com/antivirus
Message 8
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: OV relay and crowbar |
On 1/15/2021 4:09 PM, Charlie England wrote:
> On 1/15/2021 3:17 PM, Dan Ballin wrote:
>>
>> I have an internally regulated Denso alternator on a Carbon Cub. I'd
>> like some sort of OV protection and was looking at installing a
>> Crowbar and OV relay. My question is do I need the relay? If I
>> install the OV module (crowbar) on the Field wire (and ground), seems
>> like when the voltage spiked, I'd cut the field current and hence the
>> alternator output. Am I missing something???
>> Dan Ballin
> Hi Dan,
>
> Unfortunately, yes.
> Most IR alternators place the regulator between the 'ground end' of
> the field winding and the ground itself. The 'high side' of the field
> winding is tied to the B lead output. That means that if the
> regulator's final 'output' transistor fails shorted, or any of the
> drive circuitry in the regulator fails in a manner that drives the
> output transistor to full conduction, there is no control over the
> alternator's output.
>
> The 'field' terminal on IR alternators is not a positive (meaning
> 'certain') control; think of it as more of a 'suggestion box' to the
> regulator. It is not connected directly to the field winding.
>
> So if you want positive control over the B lead output, you need the
> relay. There are internal mods you can do to the alternator to allow
> positive control, if you are motivated and are willing to develop the
> required skills. While I have the requisite skill-set, my personal
> preference for my IR alternator is to just use a B lead relay; this
> allows for quick/easy swap-out of the alternator, sourced from a
> convenient auto parts store, if I have a failure while away from home.
>
> Charlie
followup:
Is this a 'homebuilt' install, or a Plane Power-branded Denso
alternator? If it's a Plane Power, it likely has built-in OV protection,
but as far as I know, Plane Power has never revealed their actual OV
circuit.
Charlie
--
This email has been checked for viruses by Avast antivirus software.
https://www.avast.com/antivirus
Message 9
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: OV relay and crowbar |
Does an internally regulated alternator have a field wire?
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=500255#500255
Message 10
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: OV relay and crowbar |
On Fri, Jan 15, 2021 at 4:31 PM user9253 <fransew@gmail.com> wrote:
>
> Does an internally regulated alternator have a field wire?
>
> --------
> Joe Gores
No. (But you knew that, didn't you?) ;-)
Message 11
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: OV relay and crowbar |
Yes, the wire from a switch to an internally regulated alternator is a control
wire. It enables the alternator. A crowbar module could be connected to the
control wire. But if the internal regulator has failed, how do know that the
control circuit has not also failed? A relay in series with the alternator output
will open the output no matter what has failed inside of the alternator.
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=500258#500258
Message 12
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Antenna Ground Planes |
Here is a dumb question about ground planes. Does the ground plane serve to direct
the signal to the antenna irrespective of whether the antenna is "connected"
to the ground plane, or must the antenna itself be electrically connected
to the ground plane?
I am asking because the tech says the best approach to the ground plane in my e-glass
composite is conductive paint on the belly. what I am wondering is how,
after the conductive paint is painted over, one ensures that the antenna is
"grounded" to the conductive paint ground plane. I think it may be the case that
the ground plane has nothing to do with "grounding" the antenna to the ground
plane, but rather that the purpose of the ground plane is to absorb signal
for the antenna located in the middle of it (whether or not the antenna "touches"
the ground plane.
As you can see, I obviously don't know how antenna ground planes work.
Appreciate your help,
Dan
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=500260#500260
Message 13
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: Antenna Ground Planes |
The ground plane does not have to be connected to the aircraft ground.
But it does have to be connected to the coax shield at the antenna base.
I doubt very much that conductive paint will work. Test the paint with an ohmmeter.
Consider an internal antenna:
http://www.aeroelectric.com/articles/Antennas/Morris_Com_Loop_Antenna.pdf
There are other designs for internal antennas on fiberglass aircraft.
Bob's book has a chapter on antennas.
http://www.aeroelectric.com/Books/Connection/
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=500261#500261
Other Matronics Email List Services
These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.
-- Please support this service by making your Contribution today! --
|