jessejenks(at)hotmail.com
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 Posted: Wed Jan 13, 2010 10:49 am Post subject: AeroElectric-List Digest: |
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| Quote: | | Time: 06:36:34 AM PST USFrom: "Robert L. Nuckolls C III" <nuckolls.bob(at)aeroelectric.com>Subject: Re: planning >So C I guess the jumper is what causes the run-on C and whatever I do >I don't want it in there. I don't already have a separate contactor C >so the way I understand it my options are; 1) use Z-22 with a relay C >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 C the armature is highly geared down to crank the engine at 150 to 300 rpm. when the engine starts C it's suddenly running at 4x that speed. Were it not for over-run clutches C this would immediately spin the armature up to 4x it's operating speed and probably throw windings C commutator bars C 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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