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1. 10:28 AM - Re: Pitot Heat Ground (DougW)
2. 02:28 PM - Re: Pitot Heat Ground (DougW)
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| 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
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=447162#447162
Message 2
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| 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 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
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=447172#447172
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