hasbroucka(at)yahoo.com
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 Posted: Tue Feb 26, 2013 9:14 am Post subject: trouble with building Contactor 'Cooler' duty controller |
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I’m building a SeaRey Rotax 914, and am close on alternator amperage output. After reviewing archives I have now attempted to construct Bob’s ‘Contactor Cooler’. I am very weak on electronics knowledge, but for the $20 investment, I gave it a shot.
I noticed that Caps come is different ratings and materials of construction, and for this stage of the experiment I decided to ignore this and simply purchase the uf ratings as listed on the schematic. Do the voltage ratings or materials of construction matter to this device?
I finished assembly today, and noticed that I did not purchase any iN400X diodes (I assume the X could be any available #?) I recognized the 400X as voltage spike protection for avionics, so I decided to proceed without a diode across the contactor coil.
The device worked for three cycles, about 5 seconds each, and simply no longer operates the contactor. There was no smoke and no detectable warmth.
I suspect that the missing diode allowed the coil V-spike to damage my assembly?
If so, can anyone tell me which device is most likely to need replacement? (timer, transistor, diodes, resistors or caps) Not knowing much of electronics, I only know how to test the resistors and diodes, but this is complicated by lack of isolation.
Alan ,
HasbrouckA(at)yahoo.com
SeaRey Amphibian, framework and hull assembled (not covered). Working on VFR avionics and wiring (Dynon Skyview full suite). Top Priority is keep it light, and place weight forward!
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