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Z31-B Ground power disconnect?

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scott(at)randolphs.net
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Posted: Tue Feb 14, 2006 3:56 pm Post subject: Z31-B Ground power disconnect?

Reviewing the diagram of the "piper" style ground power plug in Z-31B it

appears that once external power is applied, the contactor would stay

energized forever (at least until the battery was killed) since the

engergizing current would flow backward through the contactor and through

the solenoid coil.  Is there a key point I'm missing or is an interrupt

switch of some kind called for?  



Thanks!

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nuckollsr(at)cox.net
Guest

Posted: Wed Feb 15, 2006 5:28 am Post subject: Z31-B Ground power disconnect?

At 03:54 PM 2/14/2006 -0800, you wrote:



 	  Quote: 	
		  



Reviewing the diagram of the "piper" style ground power plug in Z-31B it

appears that once external power is applied, the contactor would stay

energized forever (at least until the battery was killed) since the

engergizing current would flow backward through the contactor and through

the solenoid coil.  Is there a key point I'm missing or is an interrupt

switch of some kind called for?


	


    Yup, it's called the ground power control switch illustrated

    in this case as a switch-breaker in the lower left quadrant

    of the drawing. If you want to use a miniature push-pull breaker,

    then an additional switch is called for . . . or you could use

    the breaker itself as the controlling device. It's a VERY low

    usage item and I'd have no heartburn about using the breaker

    as a switch in this case.



    Bob . . .

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