nuckolls.bob(at)aeroelect
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 Posted: Thu Sep 18, 2014 4:40 pm Post subject: alternator knocked off line when strobes turned on |
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At 12:31 2014-09-18, you wrote:
| Quote: | Joe,
Thank you for your input.
About all I know about the strobes is that they are old Whelans. The alternator kicks out immediately, within 2 or 3 SECONDS upon switching on the strobes. I have seen no failure in the strobes as they continue to operate normally, on battery power, after the alternator is kicked off line. Per another suggestion, I am going to look for power supplies for the strobe system in the wings in addition to the one next to the battery which may be just for the tail. |
What we're witnessing is one or more incursions on
the design limits for an aircraft device to either
emit or succumb to noise. Ostensibly, both the strobes
and ov protection system in the regulator were qualified
to their intended purposes . . . both have a long service
history.
The ov protection system is supposed to be pretty robust.
You have to ELEVATE the bus voltage above trip limits
for a pretty good interval of time . . . hundreds of
millisecond. Even if the strobe were to suffer it's worst
possible failure . . . what mechanism would pump energy
BACK into the system with sufficient magnitude to irritate
a normally functioning ov protection system?
On the other hand, one or more components within the
ov protection system could have aged sufficiently to
decrease voltage excursion or duration necessary to
trip it. This scenario seems more likely than an
'energy dump' from the strobe back into the system.
Bob . . . [quote][b]
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