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nuckolls.bob(at)aeroelect
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 Posted: Mon Oct 09, 2023 11:28 am Post subject: 3-phase current monitor |
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See if the attached suggests a path toward your
design goals for monitoring 3-dynamo health:
See also https://www.sparkfun.com/datasheets/BreakoutBoards/0712.pdf
Bob . . .
////
(o o)
===========o00o=(_)=o00o=========
< Go ahead, make my day . . . >
< show me where I'm wrong. >
=================================
In the interest of creative evolution
of the-best-we-know-how-to-do based
on physics and good practice.
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Eric Page
Joined: 15 Feb 2017
Posts: 247
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| Posted: Mon Oct 09, 2023 12:48 pm Post subject: Re: 3-phase current monitor |
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How funny -- we were both working on this at the same time.
Here's what I came up with. LED is off under normal ops and illuminates if a phase goes missing.
-Eric
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Missing Phase Detector.pdf |
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finn.lassen(at)verizon.ne
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| Posted: Mon Oct 09, 2023 5:00 pm Post subject: 3-phase current monitor |
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Interesting device. $3.79 each at DigiKey. Amazing that with boards and connectors only $3.33 ea. on Amazon.
Tempted to insert in paths to my fuse blocks and alternator field, but would introduce additional possible points of failure.
Finn
On 10/9/2023 3:28 PM, Robert L. Nuckolls, III wrote:
| Quote: | See if the attached suggests a path toward your
design goals for monitoring 3-dynamo health:
See also https://www.sparkfun.com/datasheets/BreakoutBoards/0712.pdf
 Bob . . .
                  ////
                 (o o)
  ===========o00o=(_)=o00o=========
  < Go ahead, make my day . . .  >
  < show me where I'm wrong.     >
  =================================
Â
  In the interest of creative evolution
  of the-best-we-know-how-to-do based
  on physics and good practice.
|
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nuckolls.bob(at)aeroelect
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| Posted: Mon Oct 09, 2023 5:57 pm Post subject: 3-phase current monitor |
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At 08:00 PM 10/9/2023, you wrote:
| Quote: | Interesting device. $3.79 each at DigiKey. Amazing that with boards and
connectors only $3.33 ea. on Amazon. |
Yeah, an they come already MOUNTED in
a form factor the DIY fabricator can
work with. Those 8-pin, SOIC chips and
associated board layouts are really
'fun' to work with!
I've got some coming to fiddle with a bit
before I forward them on to you to evaluate
in your DIY DAS project.
| Quote: | | Tempted to insert in paths to my fuse blocks and alternator field, but would introduce additional possible points of failure. |
Yeah . . . I think this is mostly an academic
exercise than a practical solution for
a 'problem' with very small probability of
occurrence -and- easily noted by other
instrumentation that should already be
in the airplane.
The most useful of in-flight monitors for
electrical system the low voltage warning
light. It that light is OUT, then probability
of comfortable completion of flight is
good.
The other bells-n-whistles are best
reserved for figuring why the light is
on AFTER landing whether or not they're
on the panel or in your toolbox.
Bob . . .
////
(o o)
===========o00o=(_)=o00o=========
< Go ahead, make my day . . . >
< show me where I'm wrong. >
=================================
In the interest of creative evolution
of the-best-we-know-how-to-do based
on physics and good practice.
| | - 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:
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user9253
Joined: 28 Mar 2008
Posts: 1927
Location: Riley TWP Michigan
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| Posted: Tue Oct 10, 2023 11:04 am Post subject: Re: 3-phase current monitor |
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Alternator problems such as loosing one phase or a diode failure result in a
higher AC component of the DC output. Based on that, perhaps something
like the circuit below connected to an EFIS input will warn if the AC
component is higher than a normal setpoint. If the signal is too weak, it
could be amplified. Is this idea feasible?
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Joe Gores |
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