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(ET) Thoughts on NiCDs and card 4
Got about 60ah from the NiCD pack today; very busy one doing mowing,
sweeping, and driving all day long. Finally one side of the pack started
dropping out, so now it's all on charge again.
I think I'm going to want to put in a pair of contactors on the packs so
they are not connected when the tractor is off, and can allow me to
isolate the tractor to run/charge on one pack or the other. Anyone know
if the start switch can be tapped to power a seperate pair of
contactors, or should I put in another relay for this? Or does kicking
start alone latch any of the relays?
Card 4 is also interesting; I fixed that burned connection on it, popped
it back in the tractor, and promptly set one of the diodes on fire. Hm.
Guess it was a blown diode after all. I gave up and pulled all four of
those field diodes, drilled out the holes a bit wider, and installed
four new Radio Shack 3 amp diodes. 400 volt PIV as well; figured with
the field dropping out you might get some surges. This should fix the
problem, however I think given this and other people with problems it's
time to replace your diodes. Drill out the holes with a tiny drill bit,
and install the RS 3 amp ones. My guess is they used 1 amp diodes, and
aside from being old, they're just too small.
Another thought: The control bus is fused by a 20 amp fuse. That's way
too high for some of those components, maybe we should use a 5 or 10 amp
fuse?
Chris