For those of you following the drama:
A few days ago my main HV fuse blew.
I used a lightbulb to test the Curtis 1231C controller and it was able
to control the bulb when I pressed on the throttle, so I thought it
might be a problem with my motor or wires. After I checked out the motor
and wires and everything appeared OK, I put a new fuse in and gave the
truck a test drive after I was able to spin the motor in neutral just fine.
Everything was fine at low speeds and current (100A or less) but as soon
as I tried to accelerate to 25-35 mph speeds I noticed that my motor was
only getting 300 amps max. In the past I've had it peg my 500 amp meter
under heavy acceleration.
(This is the point I probably should have let up on the throttle ;>)
After holding the throttle down for about 5 seconds longer than I should
have, the controller failed completely and I was no longer able to get
any current to the motor. (But I had built up enough speed to coast back
home....)
My guess:
When my HV fuse blew the first time, it was because one or more of the
IBGT's in the controller had fried (shorted I assume, blowing the fuse).
At some point later, they became "un-shorted" and the remaining
controllers were able to drive the lightbulb and even my motor at low
current draws, but when I tried to use the vehicle at street speeds they
became overwhelmed and then also blew. (At least they did not take out
my replacement fuse this time....)
I assume it may be possible to repair the controller by replacing just
the IGBT's if nothing else was fried?
Any pointers on repair procedures?
(I'm also in the market for a replacement controller, see my other
email...I'm thinking of attempting the repair mostly to have a spare and
for the experience...)
Thanks,
Jay
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