Re: (ET) NEED E-15 Traction motor profile to program Sepex controller (1268)

[john <johnreinhard rochester rr com>]

All my factory controllers are dead.

My main working E-15 has Curtis 1204M for armature control, simple DPDT 
switch on shunt field for reverse, and no variable control on the shunt 
field.

It also has Hall effect 'gas' pedal from some GM car.

For the speeds from 0 to max armature, it is so smooth, & quiet (& easy 
for those used to gas mowers with a foot pedal).

Also, since PWM, very little wasted energy in armature speeds less than 
max (though probably a bit more than OEM at max, via contactor only).

I could repair one of the OEM controls, and I might have to (very 
tedious effort, in the past, on more than one tractor).

I have all the equipment (DSO, current probe & amp, etc.) to do serious 
analysis, and that would be informative (and better than nothing).

But it would be my random use around the yard, not exactly same as motor 
design engineers specs and tested parameters, and time consuming.

So, I was really hoping to find the original GE specifications / graphs.

Thank you for contact name at Alltrax (they might help, since they no 
longer make a product customized for Elec-Trak), and other suggestions.

John


On 12/27/25 14:50, David Roden wrote:
> On 27 Dec 2025 at 13:28, john wrote:
>
> > Does anyone also have any graphs or charts that show the low current
> > (shunt) field amp curve (Faston tab terminals on E-15 motor), related to
> > armature amps ?
> Have you tried monitoring field and aramture current while operating your
> tractor with the factory controller?  They might not be optimal values, but
> could be a starting point.
>
> One way to do this is with appropriate shunts and a couple of logging
> multimeters.  I've also set up a mobile phone to shoot video of the meters
> in similar situations.
>
> You also might try getting in touch with Damon Crockett at Alltrax.  They
> designed the DC-300-ET controllers a long time ago - around 2000 or 2001, I
> think - and they must have had the motor data available then.  Maybe they
> still have it, or at least the field maps they made from it.  Whether
> they'd be willing to share it is another matter, I suppose.
>
> Good luck.
>
>
> David Roden - 25 Years with ETs
>
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