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jgamtmann2(at)gmail.com
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 Posted: Fri Oct 14, 2011 7:35 am Post subject: Toyota (denso) alternator |
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I am using an internally regulated Toyota (Denso) alternator on my RV6. It has the normal B+ charging lead and a plug with 3 spade connectors. One is for the light, one for sense and one labeled IGN that supplies 12V to energize the alternator before it starts running. Can anyone tell me what happens to the output of this alternator if the IGN wire is disconnected during flight (i.e. while the alternator is running)? I have my alternator switch in this IGN line to take the alternator Off Line, but something tells me this is not a good idea and that the alternator output may run away.
Regards, Jürgen Amtmann
[quote][b]
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nuckolls.bob(at)aeroelect
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| Posted: Fri Oct 14, 2011 8:31 am Post subject: Toyota (denso) alternator |
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At 10:30 AM 10/14/2011, you wrote:
I am using an internally regulated Toyota (Denso)
alternator on my RV6. It has the normal B+
charging lead and a plug with 3 spade
connectors. One is for the light, one for sense
and one labeled IGN that supplies 12V to energize
the alternator before it starts running. Can
anyone tell me what happens to the output of this
alternator if the IGN wire is disconnected during
flight (i.e. while the alternator is running)? I
have my alternator switch in this IGN line to
take the alternator Off Line, but something tells
me this is not a good idea and that the alternator output may run away.
Regards, Jürgen Amtmann
The risks of uncontrollable runaway for internally
regulated alternators is very low but not zero.
Commercial offerings of automotive conversions for
aircraft either modify the alternator for EXTERNAL
regulation and OV protection (a la B&C) or get
modified to accept external OV protection (a la
Plane-Power).
No doubt there are thousands of internally regulated
alternators flying without ov protection that have
never experienced a runaway failure . . . but there
have been a few . . . with predictable results.
The choice is yours.
Bob . . .
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