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airlincoln(at)sbcglobal.n
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 Posted: Tue Jun 08, 2010 9:44 am Post subject: twisted pairs -- turns per inch |
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I'm now installing a roll servo in the right wing of my RV-7A and I know I read this somewhere in the AEC but can't find it now -- how many twists per inch (or per foot) should there be for a twisted pair of 22 AWG wires (does this vary by wire size?)? Also, is grounding the negative lead for the servo out at the wing going to possibly create problems that could be eliminated by running the ground back to the firewall grounding block? Thanks.
Do not archive
Lincoln Keill
RV-7A
[quote][b]
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nuckolls.bob(at)aeroelect
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| Posted: Tue Jun 08, 2010 9:56 am Post subject: twisted pairs -- turns per inch |
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At 12:42 PM 6/8/2010, you wrote:
| Quote: | I'm now installing a roll servo in the right wing of my RV-7A and I
know I read this somewhere in the AEC but can't find it now -- how
many twists per inch (or per foot) should there be for a twisted
pair of 22 AWG wires (does this vary by wire size?)?
|
For the most part, twisting is a physical convenience
for bundling a group of wires while minimizing the
numbers of string-ties or tie-wraps necessary to
keep the wires in close proximity. 5 turns per
foot are enough, 10/ft are probably too tight.
| Quote: | Also, is grounding the negative lead for the servo out at the wing
going to possibly create problems that could be eliminated by
running the ground back to the firewall grounding block? Thanks.
|
What do the manufacturer's drawings say? If I were
manufacturing an autopilot system, the servos
would get power from, signals from, and grounds
returned to the black box that holds the servo
drive electronics.
In other words, keep ALL wires to the servo
in close proximity bundle for full length of
the run. Ground the servo to assigned pin in
a connector or to the SAME ground as electronics
in black box that drives the servo.
Bob . . .
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ralphmariafinch(at)gmail.
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| Posted: Tue Jun 08, 2010 5:01 pm Post subject: twisted pairs -- turns per inch |
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Bob, if the twisted pair is shielded, where would you ground the shield?
Locally at the servo, or same place as the electronics?
Ralph Finch
Davis, California
RV-9A QB-SA
<nuckolls.bob(at)aeroelectric.com>
| Quote: | Also, is grounding the negative lead for the servo out at the wing
going to possibly create problems that could be eliminated by
running the ground back to the firewall grounding block? Thanks.
|
What do the manufacturer's drawings say? If I were
manufacturing an autopilot system, the servos
would get power from, signals from, and grounds
returned to the black box that holds the servo
drive electronics.
In other words, keep ALL wires to the servo
in close proximity bundle for full length of
the run. Ground the servo to assigned pin in
a connector or to the SAME ground as electronics
in black box that drives the servo.
Bob . . .
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database 5183 (20100608) __________
The message was checked by ESET Smart Security.
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nuckolls.bob(at)aeroelect
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| Posted: Tue Jun 08, 2010 6:34 pm Post subject: twisted pairs -- turns per inch |
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At 07:59 PM 6/8/2010, you wrote:
| Quote: |
<ralphmariafinch(at)gmail.com>
Bob, if the twisted pair is shielded, where would you ground the shield?
Locally at the servo, or same place as the electronics?
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Unless the instructions call for something different,
one end only and at the same end as the electronics
box.
Bob . . .
////
(o o)
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< Go ahead, make my day . . . >
< show me where I'm wrong. >
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