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OV protection in an internally regulated alternator

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grantn

Joined: 04 Nov 2006
Posts: 11
Location: Campbell River, B.C. Canada

Posted: Tue Dec 26, 2006 10:08 am Post subject: OV protection in an internally regulated alternator

When using the aeroelectric connection diagram for crowbar overvoltage

protection for an internally regulated alternator, why is it necessary to

have the continuous duty contactor in the system? Doesn't the OV module

cause the alternator field circuit breaker to trip, effectively shutting

down the alternator? It seems a redundancy to me to have both the alternator

field circuit and the contactor. And when the circuit breaker trips and the

contactor opens is there any risk of a voltage spike or arcing from the

contactor?

Thanks for any responses. I know there must be something I'm not

getting..........

Grant Neilson

RV9A, Firewall forward

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