nuckollsr(at)cox.net
Guest
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 Posted: Wed Mar 08, 2006 6:32 pm Post subject: Continuous duty contactor wiring question |
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At 10:05 AM 3/9/2006 +1100, you wrote:
| Quote: |
Robert L. Nuckolls, III wrote:
> In this case, systems integration issues go
> beyond the magnetic field collapse in the
> coils. Folks here on the list have raised
> legitimate issues with respect to the contactor's
> ability to reliably open a runaway alternator's
> output. This has almost nothing to do with
> the coil circuit and everything to do with
> contact spreading velocity and ultimate gap
> (or double gap) distance in the open contactor.
Out of curiosity, would a large capacitor across the contactor similar
to points ignition help? Or is there too much energy involved for a
reasonably sized capacitor to absorb?
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Excellent question! and I would bet that the answer is "yes". It
would function in very much the same manor as the ignition points
you cited and as arc-suppression duties as I discussed in the
'Connection in the OV Protection chapter and as shown across the
relay contacts on page 3 of:
http://www.aeroelectric.com/Catalog/AEC/9011/9011-700-1C.pdf
It could be calculated if the system characteristics were
accurately known . . . or crafted by empirically during
bench tests.
Bob . . .
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