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Re: (ET) GE controller

Does it always go forward? You need to ensure that the field stays the same polarity regardless of the armature polarity if it reverses by driving the armature with reverse voltage. Otherwise if you have the field and the armature wired together it will always go in the same direction.
Technically the E15 and E20 motors do have a "preferred" forward. They're not quite shunt motors, the armature circuit does go through a very small (and thick) field winding alongside the normal small shunt current field. The reason for this is that when the tractor goes uphill in forward the field strength will be increased as current draw goes up slowing down the motor and giving it more torque.
If you go up a hill in reverse the field will actually get weaker and the motor will try to pull more current which is not great. I think this is why they lock out field weakening in reverse. 

C

On 7/25/2021 2:35 PM, JOHN J CASEY via Elec-trak wrote:

My ET is 26AE12CA, bought in ’99.   The wiring is oem, no Rube Goldberging 
here.  Years back I changed the drive motor to one from an E20 with minor 
modification to the motor field.  In 2017 I upgraded to a Curtis 1204m operating 
system.
Works great.

Oem E20 ’s and I think, E15’s,  have a separate fwd/rev switch…same for 
the Curtis.  Settin on my bench for three years is a GE 262FS1 controller.  Jerry Rhodes (may 
he rest in peace) used this controller when he built METI tractors; I bought it from him.
Because GE does not require a fwd/rev switch, I’d like to use it in my tractor.  Jerry 
provided instruction but I could not make the GE work.  I can follow instruction but 
don’t have the electronics chops to figure out why the GE don’t work.

When upgrading to Curtis I did not cut out wiring that was no longer needed, just 
folded them back.  Anyone have GE instruction that I can compare to what I have 
now…must have missed a step.

Thanks,  Cheers
Jack
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