paul.r.kuntz(at)gmail.com
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 Posted: Mon Aug 19, 2013 7:32 pm Post subject: Rotax 912 UL alternator drop-out |
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Thanks for the input, Bob. Your guess is in line with my own thinking and is consistent with the symptoms. The failure mode seems to be something that was in need of the first long-duration steady load to surface, and then became more consistent over the following several flight hours. I'm optimistic that replacing the regulator will provide a fix without having to make other changes.
Paul Kuntz
On Mon, Aug 19, 2013 at 7:52 PM, Robert L. Nuckolls, III <nuckolls.bob(at)aeroelectric.com (nuckolls.bob(at)aeroelectric.com)> wrote:
[quote]--> AeroElectric-List message posted by: "Robert L. Nuckolls, III" <nuckolls.bob(at)aeroelectric.com (nuckolls.bob(at)aeroelectric.com)>
| Quote: | I see a max load of 10 amps with everything running, so I am satisfied that the total load is well within the standard Rotax system capacity. I also observed that the system voltage drops to 13.5 volts at the 10 amp max load, which seems abnormal. Under this max load, the alternator dropped out after a few minutes, indicated by system voltage dropping to around 12.5 volts -- consistent with fully charged lead-acid battery.
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The symptoms you observed suggest a temperature sensitive
failure mode within the regulator . . . like a connection
that opens when the regulator warms up. While a cooling
system MIGHT mask this failure, it wouldn't necessarily
be a case of overheating beyond rated operating temperatures
rather a case of an intermittent connection that is
temperature sensitive.
Bob . . .
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