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                           AeroElectric-List Digest Archive
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                     Total Messages Posted Sun 12/27/15: 1
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Today's Message Index:
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     1. 03:28 PM - Re: Re: Cessna OV protection + DIODE across ALT side of Master Swith  (Robert L. Nuckolls, III)
 
 
 
________________________________  Message 1  _____________________________________


Time: 03:28:19 PM PST US
From: "Robert L. Nuckolls, III" <nuckolls.bob@aeroelectric.com>
Subject: Re: AeroElectric-List: Re: Cessna OV protection + DIODE across   ALT side
of Master Swith

At 07:35 AM 12/26/2015, you wrote:
>
>Does anyone have any info regarding the internal circuitry of the 
>Cessna over-voltage sensor?   I am wondering if this sensor's 
>internal transistorized circuit contains the equivalent of the 
>removed diode and therefore a separate diode is no longer needed for 
>arc suppression at the ALT side of the master switch.  Hmmm.

   I proposed a latching ov sensor circuit
   to Cessna about 1970 with a schematic like
   this

http://tinyurl.com/7g7mn6l

   I never manufactured any and was not involved
   in the qualification so I don't KNOW that
   the drawing cited above exactly matches what
   went into the airplanes  . . . but a technician
   who once worked for Electro-Mech and manufactured
   the device after Hopkins lost the job says it's
   "real close."

   The diode is not included in any of my drawings
   because it is assumed that the REGULATOR already
   has the usual diode from F to ground.

   The diode was part of the original Cessna installations
   because the alternator switch actually controlled the
   field relay inside the electro-mechanical regulators

http://tinyurl.com/d7ln4mt

   This relay was not fitted with the recommended
   diode. When the electro-mechanical regulators
   were replaced with solid state . . . the diode
   became part of the regulator and no longer
   necessary at the switch.


   Bob . . . 

 

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