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Cessna OV protection + DIODE across ALT side of Master Swi

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nuckolls.bob(at)aeroelect
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Posted: Sun Dec 27, 2015 3:28 pm Post subject: Cessna OV protection + DIODE across ALT side of Master Swi

At 07:35 AM 12/26/2015, you wrote:

  	  Quote: 	
		  --> AeroElectric-List message posted by: "racerjerry" <gnking2(at)verizon.net>



 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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racerjerry

Joined: 15 Dec 2009
Posts: 202
Location: Deer Park, NY

Posted: Mon Dec 28, 2015 6:10 pm Post subject: Re: Cessna OV protection + DIODE across ALT side of Master

Thank you very much, Bob. That was precisely the info that I needed.

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_________________
Jerry King

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