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From: <rogersda@cox.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Overvoltage
Date: Sun, 5 Oct 2003 11:03:35 -0400
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Message-Id: <20031005150335.KZX23864.fed1mtao03.cox.net@smtp.west.cox.net>

Marvin Kaye <marv@lancaironline.net> wrote:
> 
>
> ... so he purchased one of Bob Nuckoll's crowbar 
> modules and had it sitting unused.  When installing the ground power system I 
> decided to incorporate the crowbar circuit to protect us against the 
> possibility of a line guy accidentally hooking up a 24V GPU and blowing things 
> up.  

   Indeed, the contactor method does have the additional 
advantage of using lower current components for the crowbar 
circuitry, since it only has to short out the low-draw contactor coil.  I like that.  I'd like it even better if 
the contactor was a stepping relay and the crowbar actuated 
the stepper to the "off" position. 

Regards,
Dale R.


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