 |
Matronics Email Lists
Web Forum Interface to the Matronics Email Lists
|
| View previous topic :: View next topic |
| Author |
Message |
DougW
Joined: 16 Sep 2015
Posts: 14
Location: Washington
|
 Posted: Thu Sep 17, 2015 9:26 am Post subject: Re: Pitot Heat Ground |
 |
|
Bob,
This has been a rather lengthy thread. Being somewhat confused by various elements of the discussion, and as a recent acquirer of the Dynon heated pitot, I decided to look at the latest installation instructions.
On page 3-1, it states to keep wires to the controller and between the controller and pitot away from any magnetometer/ADHRS, as well as audio devices.
On page 3-2, it states "Do not connect the Black (Ground) wire to the airframe as a Ground connection."
On page 3-4, the figure shows the black wire going "To permanent connection to aircraft ground"
I could not find anywhere where it indicated that the metal case of the controller was and electrical ground for the controller.
As a longtime follower of your comments and advice, I have avoided using the airframe as a ground except at one point on the firewall where it is grounded to the electrical system ground. For my installation, I will be generally following this comment of yours even though my magnetometer is in the tail cone, well away from the pitot heat wiring path:
Were I designing such a beast, all power wiring
between tube and box . . . and from box to ship's power
would be on twisted pairs with the box providing
EMC grounding only . . . power would float (this
is the way the BIG guys do it).
However, given the state of the conversation, I am wondering it a resistance measurement has been made between the proposed installation site and a common electrical ground point. Also, as the current must flow through the single +12v wire to power the controller/pitot provide the electromagnetic interference that the originator of this thread is trying to avoid?
Regards,
Doug Windhorn
| | - The Matronics AeroElectric-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?AeroElectric-List |
|
|
|
| Back to top |
|
 |
DougW
Joined: 16 Sep 2015
Posts: 14
Location: Washington
|
| Posted: Thu Sep 17, 2015 1:26 pm Post subject: Re: Pitot Heat Ground (edited) |
|
|
Bob,
This has been a rather lengthy thread. Being somewhat confused by various elements
of the discussion, and as a recent acquirer of the Dynon heated pitot, I decided
to look at the latest installation instructions.
On page 3-1, it states to keep wires to the controller and between the controller
and pitot away from any magnetometer/ADHRS, as well as audio devices.
On page 3-2, it states "Do not connect the Black (Ground) wire to the airframe
as a Ground connection."
On page 3-4, the figure shows the black wire going "To permanent connection to
aircraft ground"
I could not find anywhere where it indicated that the metal case of the controller
was and electrical ground for the controller.
As a longtime follower of your comments and advice, I have avoided using the airframe
as a ground except at one point on the firewall where it is grounded to
the electrical system ground. For my installation, I will be generally following
this comment of yours even though my magnetometer is in the tail cone, well
away from the pitot heat wiring path:
Were I designing such a beast, all power wiring
between tube and box . . . and from box to ship's power
would be on twisted pairs with the box providing
EMC grounding only . . . power would float (this
is the way the BIG guys do it).
However, given the state of the conversation, I am wondering if a resistance measurement
has been made between the proposed installation site and a common electrical
ground point. I don't trust my airframe to conduct low resistance currents as it has been corrosion proofed internally.
As the current for the heated pitot also must flow through the single +12v
wire to power the controller/pitot, would this not provide the electromagnetic interference that
the originator of this thread is attempting to avoid?
Regards,
Doug Windhorn
| | - The Matronics AeroElectric-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?AeroElectric-List |
|
|
|
| Back to top |
|
|
|
|
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum
|
Powered by phpBB © 2001, 2005 phpBB Group
|
Get Email Distribution Too!
FAQ
Search
Memberlist
Usergroups
Register
Profile
Log in to check your private messages
Log in
