nuckolls.bob(at)aeroelect
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 Posted: Fri Oct 14, 2011 8:39 am Post subject: Toyota (denso) alternator (OOPS) |
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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)?
OOPS! I hit the 'send' button too soon.
Controlling power to the IGN lead will place the alternator
off/on-line while the engine is running. It's not
an unsafe or risky thing to do. However, there
are failures internal to the regulator that
cannot be controlled by the switched IGN lead.
Suggest you review the articles on ov protection
here:
http://tinyurl.com/3hj8gm2
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 . . . [quote][b]
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