---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Thu 08/11/22: 3 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 03:56 AM - Ground power (GLEN MATEJCEK) 2. 06:35 AM - Re: Ground power (Robert L. Nuckolls, III) 3. 11:12 AM - Re: Ground Power Z-31 (user9253) ________________________________ Message 1 _____________________________________ Time: 03:56:05 AM PST US From: GLEN MATEJCEK Subject: AeroElectric-List: Ground power On Thu, Aug 11, 2022 at 6:38 AM AeroElectric-List Digest Server < aeroelectric-list@matronics.com> wrote: > * > > I don't know if a reverse voltage or reverse current sensor is available > at a reasonable > price. > If so, the sensor could monitor the current or voltage drop on the cable > that goes > between the ground power contactor and aircraft battery > contactor and could open the ground-power contactor coil circuit when > current > is reversed. > Consider this: [image: latest Ground power OV.bmp] ________________________________ Message 2 _____________________________________ Time: 06:35:41 AM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: Ground power >Consider this: >latest Ground power OV.bmp That's what most of the folks decided on . . . but the ground side of the annunciator needs to go on the other side of the control-breaker so that the light goes out when the breaker is open. The series diode on the coil circuit is not necessary . . . the spike catcher across the coil prevents energizing the ground power contactor with reversed polarity power. Bob . . . Un impeachable logic: George Carlin asked, "If black boxes survive crashes, why don't they make the whole airplane out of that stuff?" ________________________________ Message 3 _____________________________________ Time: 11:12:37 AM PST US Subject: AeroElectric-List: Re: Ground Power Z-31 From: "user9253" PIPER TYPE GROUND POWER SOCKET Aircraft Spruce Part# 11-00500 MFR Model# 11041 is described as Diecast housing, spring-loaded door. Assuming that the door is aluminum (non magnetic), a bar magnet could be epoxied to it. Then a magnetic reed switch could be mounted out of sight, but within the magnetic field. The switch should close when the door is open, thus enabling the aux contactor coil circuit. -------- Joe Gores Read this topic online here: http://forums.matronics.com/viewtopic.php?p=507656#507656 ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message aeroelectric-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/AeroElectric-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/aeroelectric-list Browse Digests http://www.matronics.com/digest/aeroelectric-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.