Today's Message Index:
----------------------
1. 12:01 AM - Re: Flashing on One side Ceases after a Minute or so (George Nielsen)
2. 09:18 AM - ULPower Alternator/Regulator (Sebastien)
3. 11:34 AM - Re: ULPower Alternator/Regulator (user9253)
4. 02:01 PM - Re: ULPower Alternator/Regulator (Robert L. Nuckolls, III)
Message 1
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| Subject: | Re: Flashing on One side Ceases after a Minute or so |
Glen, thank you for your reply. Indeed this unit has been dormant for a
few years. I reckon that I will have to switch it on regularly.
George
> Time: 11:50:09 AM PST US
> From: GLEN MATEJCEK <fly4grins@gmail.com>
> Subject: AeroElectric-List: Flashing on One side Ceases after a Minute or so
>
>
> Howdy-
> Has the unit been sitting dormant long? I seem to recall from some long time
ago
> that there were electrolytic capacitors in that power supply that could go
> bad if they sat unused for long periods. There was the possibility of recovering
> them if the went through repetitive power up cycles over time. So, you might
> just try powering on every so often to see if it starts functioning properly
> again. I
>
Message 2
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| Subject: | ULPower Alternator/Regulator |
Does anyone have experience with this system? My friend is installing a
UL350 Engine and their wiring diagram and instructions specify no
protective devices between the alternator and the battery.
Does anyone know if this alternator/regulator combination can suffer from
an overvoltage event? Or is the regulator fault tolerant?
Regards,
Sebastien
Message 3
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| Subject: | Re: ULPower Alternator/Regulator |
When the alternator "B" lead shorts to ground, the pilot will be lucky if there
is no
fire when the "B" lead turns white hot and melts from high battery current.
Now that the alternator is no longer connected, the electrical
system relies on the battery. But half of the battery energy has already been
depleted melting the "B" lead. Either a large fuse or fusible link should
protect the "B" lead from excessive battery current, regardless of what UL Power
says.
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=505365#505365
Message 4
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| Subject: | Re: ULPower Alternator/Regulator |
At 11:16 AM 12/23/2021, you wrote:
>Does anyone have experience with this system? My friend is installing a
>UL350 Engine and their wiring diagram and instructions specify no protective
>devices between the alternator and the battery.
Protecting b-lead wiring from hard faults within
the alternator itself is a legacy protocol in
T/C aircraft since the first Ford alternator was
bolted to a Cessna (approx 1964).
However, LOTS of automotive applications tie
the alternator b-lead right to battery (+)
(like my '87 GMC) with some later models
adding a fusible link at the battery end
(like the 97 Chevy I worked on last week).
What kind of alternator is on the UL350, wound
field or permanent magnet?
>Does anyone know if this alternator/regulator combination
>can suffer from an overvoltage event? Or is the regulator
>fault tolerant?
There is NO alternator system immune to OV events.
Probability, severity and risk run the gamut from
a little puff of smoke to a major incendiary event.
That needs to be sorted out in a failure mode
effects analysis with appropriate prophylactics
incorporated.
As supplier of the system, the engine manufacturer
SHOULD have conducted those studies and published
well considered protocols in their manual . . .
unfortunately, few engine suppliers have any notion
of what that process entails.
The usual answer to a query on the matter is: "we've
got xxxx of these flying with no reported events of
noteworthy magnitude."
For this List to offer any more considered advice,
much more data are needed as to system characteristics.
The SAFE thing is to incorporate b-lead and ov protection
as a matter of policy . . . it's light, cheap and better
to have it and not need it as opposed to needing and
not having.
Bob . . .
Un impeachable logic: George Carlin asked, "If black boxes
survive crashes, why don't they make the whole airplane
out of that stuff?"
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