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gordonrsmith921@yahoo.com
Joined: 06 Oct 2009
Posts: 24
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 Posted: Sun Jun 27, 2010 2:34 pm Post subject: LV Warn Light vs. Alternator Light |
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Given – You have installed a device for active notification of low voltage that moniters Main Bus voltage and lights an indicator lamp/Led if voltage drops below a programmed level.<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" />
The first thought if this light comes on is that the alternator is off line and not outputting to the battery or aircraft bus systems. However this is not necessarily true.
Can not there be a condition where the alternator is puitting out it’s maximum capacity but you are trying to use a total load greater than that capacity. I think this would eventually pull the battery and main bus voltage down to a point where the <?xml:namespace prefix = st1 ns = "urn:schemas-microsoft-com:office:smarttags" />LV warning light would turn on.
My thought was that maybe it would be advantageous to have an additional indicator of alternator function. Many regulators for both field wound and/or permanent magnet alternators have a “light”. But what does that light actually tell you?
On a schematic supplied by Jabiru for the J3300 the stock supplied regulator for the permanent magnet regulator system has a “light” connection. It is identified as “To Low Voltage Warning Light”. Is this just redundant LV warning or does it actually tell if the there is alternator output?
Gordon Smith
[quote][b]
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nuckolls.bob(at)aeroelect
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| Posted: Sun Jun 27, 2010 3:26 pm Post subject: LV Warn Light vs. Alternator Light |
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| Quote: |
The first thought if this light comes on is that
the alternator is off line and not outputting to
the battery or aircraft bus systems. However this is not necessarily true.
Can not there be a condition where the
alternator is puitting out it’s maximum
capacity but you are trying to use a total load
greater than that capacity. I think this would
eventually pull the battery and main bus voltage
down to a point where the LV warning light would turn on.
|
Not if one has accomplished the customary load
analysis. The legacy approach to sizing alternators
to loads makes it impossible to overload the alternator.
Now, if one PLANS to have more potential load than
the alternator can carry, then an alternator loadmeter
is indicated to assist the pilot in turning things
on/off as needed to stay within the alternator's
capabilities.
| Quote: | My thought was that maybe it would be
advantageous to have an additional indicator of
alternator function. Many regulators for both
field wound and/or permanent magnet alternators
have a “light”. But what does that light actually tell you?
|
Those are in the same class as the alternator warning
light on vehicles for 50+ years. They accurately indicate
a broken wire, broken belt and some system failures but
not all. An they're not a LV warning light.
The stand-alone, active notification of LV is still
the single most useful electrical system flight instrument.
| Quote: | On a schematic supplied by Jabiru for the J3300
the stock supplied regulator for the permanent
magnet regulator system has a “light”
connection. It is identified as “To Low
Voltage Warning Light”. Is this just
redundant LV warning or does it actually
tell if the there is alternator output?
|
Same as cited above. Not a 'real' lv warning
system.
Bob . . .
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