Re: (ET) Reverse draws a lot of current: Why?

["David Roden (Akron OH USA)" <roden ald net>]

On 23 Feb 2002 at 18:51, Christopher Zach wrote:

> Actually, I checked the wiring schematic, and don't think the reversing
> relay is the problem.
> 
> On an E20, field current is not reversed when you reverse the tractor.

I have an E15, not E20.  On mine reverse is accomplished by reversing the 
field.  I believe that some E20s reversed the field also, despite what 
the diagram says; not sure.  Check your own tractor.

Regardless, the symptoms you describe -- high current and high speed with 
little torque -- strongly suggest low or no field current.  They are 
occuring in reverse only.  So, if it's not the reverse relay, and I still 
suspect that it is, you'll have to trace things out to discover what is 
causing low/no field current in reverse.

Perhaps the reverse relay operates, but doesn't actually reverse the 
field?  Odd, but possible ...


David Roden - Akron, Ohio, USA
1991 Solectria Force 144vac
1991 Ford Escort Green/EV 128vdc
1970 GE Elec-trak E15 36vdc
1974 Avco New Idea 36vdc
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