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Mike Easley wrote: I came across some literature from Tyco on
what they call "back EMF suppression", basically the
reason everybody installs diodes on their contactor coils. After
reading a bunch of literature, it appears that the diodes protect the switches
on panel, but severely degrade the speed that the high amperage contacts
separate. That's bad, since it increases the wear on the contacts
significantly. I remembered that Eric at Perihelion Design sold Snapjacks that are
supposed to be superior to diodes. They're Bi-Directional Zener Transient
Voltage Suppressors, what a mouthfull. That is exactly what the Tyco
literature explained.
Eric
only lists a SnapJack
kit for 12V airplanes. I need 24V and I only need a few SnapJacks. So I
decided to track down what Eric is using in his SnapJacks. By tracking
Eric's part #P6KE18CA, they also manufacture a P6KE36CA
that increases the voltage to what I need for my customer. I
figured Eric had a 50% headroom 12-18V for his Snapjacks, so I should go with 36V.
Mike,
I ordered a 24v “kit” from Eric and installed these
on my IV-P. As far as I can tell, they are at least as good as elephant repellant…no
electrical problems/failures of any components in 350+ hours/18 months of
flying. I say “elephant repellant” because this is probably pretty
early in the life of my electrical system to be making rash claims, but so far,
they have been worth the investment. Easy to install as well..
Bob
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