Today's Message Index:
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1. 08:49 AM - Re: "Contactor Questions" now CONTACTOR AUTOPSY (Robert L. Nuckolls, III)
2. 09:49 AM - Re: Locking 3P switch? (johnbright)
Message 1
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| Subject: | Re: "Contactor Questions" now CONTACTOR AUTOPSY |
At 11:19 AM 6/12/2021, you wrote:
>So there I am rummaging=C2 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.
>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=C2 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?"
Message 2
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| Subject: | Re: Locking 3P switch? |
Re "N87BP_Engine_Bus_Detail.pdf" of 11 June 2021
I'm not seeing a failure mode that keeps the engine running if the SDS CPI-2 backup
power wires are connected to the engine bus.
There IS an SPOF in the form of the single connection to the engine bus. The Bussmann
15600 fuse block can be modified to add a 2nd stud... ref attached three
photos. The diode feed from the main bus goes to one stud and the relay feed
from the battery goes to the other stud.
--------
John Bright, RV-6A, at FWF, O-360
Z-101 single batt dual alt SDS EM-5-F.
john_s_bright@yahoo.com, Newport News, Va
https://docs.google.com/document/d/1YOtPiA3AdUsQEYR4nodBESNAo21rxdnx4pFs7VxXfuI/edit?usp=sharing
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=502366#502366
Attachments:
http://forums.matronics.com//files/bussmann_15600_fuse_block_add_a_2nd_stud_photo_1_of_3_956.jpg
http://forums.matronics.com//files/bussmann_15600_fuse_block_add_a_2nd_stud_photo_2_of_3_949.jpg
http://forums.matronics.com//files/bussmann_15600_fuse_block_add_a_2nd_stud_photo_3_of_3_148.jpg
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