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Re: (ET) shunt for Alltrax E15 retrofit - what specs, or how to substitute?
That is true on the E20 - it has a motor current shunt (plate) and an
ammeter shunt (wire). However, at least on some E12S and E15 models, a
plate shunt was used for the ammeter. It is also wired differently from
the E20, appearing at the negative end of the battery pile instead of at
the positive end. The E12 on the other hand is wired like the E20 - go
figure....
- SteveS
Chris Zach wrote:
The E12S (and E15 too I think) use a piece of copper sheet about an
1"x3" (I'm guessing here) just about in the middle of the relay area
behind the large panel under the dash. It's set up as a four point
probe - big bolts at each end for power connections with two small
sense connections in between.
I think this is *not* the shunt you're thinking of. The center shunt
is used by the field weakening system and shows current draw across
the motor armature. When it gets too high, it raises a pair of
transistors and shuts down the field weakening resistors.
The ammeter shunt is the length of wire. If you need the size and type
I can look it up.
Chris