nuckolls.bob(at)aeroelect
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 Posted: Fri Nov 05, 2010 10:21 am Post subject: Adding crowbar to older Z-11 architecture |
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At 04:33 PM 11/4/2010, you wrote:
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I have been flying for several years with Z-11 (no alternator OV
disc. contactor) and an internally regulated alternator. I would
like to know whether the simple and inexpensive step of installing a
crowbar OV module as in Z-24 will provide OV protection. I have read
Bob's article on load dump damage and I am able to turn off my
alternator with the panel "OFF/BATT/ON" switch.
My thanks to Bob or anyone else who can answer my question.
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The problem with adding ov protection for internally
regulated alternators is that there are failure modes
that cannot be controlled through the small wire.
So yes, some form of b-lead disconnect is called for
and Z-24 is one way to go about it. The load dump
thing is a bit of a red herring . . . first, there's
no NEED to flip the alternator on/off during normal,
loaded operations. Second, any IR alternator worth
it's salt will withstand a worst case load dump
many times in a row. See revision 12 chapter on
engine driven power sources in the 'Connection.
Bob . . .
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