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Grayhawk's comment reminded me of something- I had a new alternator that would drop off during climbout. I'd cycle the field breaker and that usually fixed it. Sometimes it would repeat. Once in cruise the alternator would function normally. I found that the shielded wire between the alternator and the regulator was grounded at both ends. Cutting the shield connection at the regulator cured the problem.
Voltage sensing is in reference to ground- if the ground varies (stray voltage) it can also cause problems. In my case I think the shield provided an alternate ground path that differed from the primary ground connection.
Where are the strobes grounded? -Bill W
Sky2high@aol.com wrote:
In a message dated 10/6/2007 11:19:56 A.M. Central Daylight Time, marv@lancair.net writes:
I was wondering is some of you electrical gurus may be able to
pinpoint this
problem. When my system is under heavy load (night), i.e. landing
light,
interior lighting, strobes, navs, etc...all switches in the on
position, I am
getting cycling of my alternator. It will kick on and off
intermittently, and
sometimes trip my main breaker. The strobes seem to be the major
culprit. I
have gone through individual switches and it seems to be related
to the
strobes. I can get them to do this occasionally even during the
day with no
heavy load, just strobes and the usual amenities (radios, etc.).
Think I may have a corroded connection pulling too many amps? I'm
not sure
where to begin. Thanks for any input.
Steve,
As Marv said, the battery may be weak and that only amplifies the condition. Another concern is where the regulator main bus voltage sense is located. Where is your voltmeter pickup on the main bus located? If the two are co-located, does the volt meter show abnormal fluctuations? Is it possible that the regulator sees such a low voltage at strobe initiation that the regulator kicks out? Scott Krueger AKA Grayhawk
Lancair N92EX IO320 SB 89/96
Aurora, IL (KARR)
Darwinian culling phrase: Watch This!
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