On 1/20/2013 1:13 PM, Danpatgal wrote:
So I finally found a little more time to dissect the Curtis. I used my angle
grinder and cut around the inside edges of the very hard poured (plastic?)
resin on the front of the controller. Finally it came out (IP 65 does have
it's drawbacks).
I noticed right away that two black MOSFETs are totally destroyed. The next
one over (with a white backing) might also be damaged, I'm not sure.
I didn't see any problems with the capacitors (figures, since I already
bought a few replacements), but it actually looks like an easier repair if I
had two of them, plus the slightly different round one.
See pictures here:
http://www.evalbum.com/popupimg.php?24042
http://www.evalbum.com/popupimg.php?24043
How can I get MOSFET replacements? Two are the same, one is slightly
different, though they appear to be soldered in similarly.
The damage doesn't look too bad. It's fixable.
The BUZ30A is a standard MOSFET. You can find them at any of the usual
electronics distributors (Digikey, Mouser, etc.)
The diode (with the metal lid) is a special part; a selected Motorola
MR2406F. That will be hard to find; but if only *one* is damaged, just
leave it out and run with one less diode. Do *NOT* try to replace just
one of them with some other diode in parallel. It won't match.
Be sure to check out the gate driver circuit to make sure it wasn't
damaged. Most of the time, it is. :-( So there will be more parts to
replace.
Then clean up all the soot, and patch any burned traces. Test it on the
bench (with the circuit in the Curtis manual using light bulbs as a
dummy load).
--
There ain't no rules around here. We're trying to accomplish something!
-- Thomas A. Edison
--
Lee A. Hart, http://www.sunrise-ev.com/LeesEVs.htm
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