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"Contactor Questions" now CONTACTOR AUTOPSY

 
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nuckolls.bob(at)aeroelect
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PostPosted: Mon Jun 14, 2021 7:49 am    Post subject: "Contactor Questions" now CONTACTOR AUTOPSY Reply with quote

At 11:19 AM 6/12/2021, you wrote:
Quote:
So there I am rummaging thru 30 years worth of things I kept in case I need them...hhhhmmmm
So a contactor ends up in my grubby paws, and I decide to strip it, 'cause that's what BN would do! lol

Good work sir! Thank you for sharing.


Quote:
Wear patterns on the contacts are clearly visible, but what I noticed is that with the factory assembly process, the contacts are slightly off the horizontal, so the plane of contact is not parallel with the contact disc....accidental? I think not..when you tighten the outer nut the contact turns until it hits the coil housing, unless you wedge something in there to prevent turning.

This is a fundamental weakness in contactors with
'double-nut' fat terminals as opposed to those
captive to molded, non-metalic housings.

It's a really good idea to put a wrench on the
inside nut and apply opposing torque while
tightening the outside nut.

I've encountered several contactor failures
where the fat terminals were twisted out of
alignment during installation. This is not
necessarily an automatic precursor to
failure . . . but it sure elevates risk.



Bob . . .

Un impeachable logic: George Carlin asked, "If black boxes
survive crashes, why don't they make the whole airplane
out of that stuff?"


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