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1. 05:30 AM - Re: Ground power (GLEN MATEJCEK)
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| Subject: | Re: Ground power |
Sorry for the late reply, but there is a significant detail about the
operation of my circuit that I neglected to mention. Given that I expect
that the use of external power to be an extremely rare event, the normal
position of the CB is open. Prior to applying external power I will close
the CB and let the circuit do its work. When done with the external power,
I will open the breaker which will open the contactor. While I certainly
don't advocate using a CB as a switch, this would be such a rare event it
would be less wear than cycling the CBs during the annual.
>
> I like your circuit. It will not pop the breaker in case the aux power
> polarity
> is
> reversed. Nothing will happen except that the red light will come on.
> But the circuit does not solve the problem of the contactor remaining
> energized until the aircraft battery is depleted, that is if the pilot
> does not
>
> shut off the aux power switch. Ideally the aux contactor would drop out
> when the aux power plug is removed.
>
> --------
>
>
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