nuckolls.bob(at)aeroelect
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 Posted: Sat Jun 09, 2012 9:30 am Post subject: Bad Contactor Diode? |
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At 08:56 AM 5/8/2012, you wrote:
--> AeroElectric-List message posted by: "stearman456" <warbirds(at)shaw.ca>
Recently a friend of mine purchased an RV-6A, and shortly after buying it he turned the master switch on one morning, there was a "poof", and the wire supplying the ground to the battery contactor burnt up.
This is an exceedingly rare event. So rare that legacy design goals in TC aircraft do not incorporate any form of protection for this particular wire . . .
The airplane needed some major electrical work (even prior to this). It was wired basically according to Z-11 (I recognized the architecture straight away) but CRUDE! Cripes... Anyway, we changed out the contactor as it was pretty rough looking and I had a new one on the shelf from Spruce. But it didn't have a spark catching diode so we used the old diode that the previous owner had made up. This time when he powered it up (hanging onto the ground wire) he felt the wire getting hot immediately and killed the power before anything flamed. Changed the contactor completely and put a new one from B&C (with the supplied diode) in and the problem went away.
6/9/12
The contactor and diode you sent me have been inspected. The
contactor appears functional and draws the expected
current. The diode was indeed shorted. The terminals on
the diode were of the size needed to insure proper installation
so I'm at a loss to explain the diode failure.
Bob . . .
[quote][b]
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