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                           AeroElectric-List Digest Archive
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                     Total Messages Posted Wed 01/13/10: 1
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Today's Message Index:
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     1. 10:49 AM - AeroElectric-List Digest:  (Jesse Jenks)
 
 
 
________________________________  Message 1  _____________________________________


Time: 10:49:13 AM PST US
From: Jesse Jenks <jessejenks@hotmail.com>
Subject: AeroElectric-List: AeroElectric-List Digest:


Time: 06:36:34 AM PST US
From: "Robert L. Nuckolls=2C III" <nuckolls.bob@aeroelectric.com>
Subject: Re: AeroElectric-List: planning


>So=2C I guess the jumper is what causes the run-on=2C and whatever I do 
>I don't want it in there. I don't already have a separate contactor=2C 
>so the way I understand it my options are=3B 1) use Z-22 with a relay=2C 
>2) just use a push button rated for 30 amps and no relay.

   Yes.

>Can you explain why run-on is a problem if it only lasts a couple seconds?

   The design goal for engagement solenoids with
   integral contactors is to effect immediate retraction
   of the pinion gear when the starter button is
   released. There ARE over-run clutches in the starter
   gearing that prevents the engine from back-driving
   the starter. These are VERY important . . .

   For a small starter to be efficient=2C the armature
   is highly geared down to crank the engine at 150
   to 300 rpm. when the engine starts=2C it's suddenly
   running at 4x that speed. Were it not for over-run
   clutches=2C this would immediately spin the armature
   up to 4x it's operating speed and probably throw
   windings=2C commutator bars=2C or strip gear teeth.

   The run-on phenomenon simply exercises the over-run
   mechanism and increases pinion wear for reasons that
   do not add value . . . and would not happen except
   for an unintended consequence of using the solenoid/
   contactor in a manner contrary to original design
   goals.

   Bob . . . 

Thanks Bob. I think I finally get it.
  		 	   		  
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