Re: (ET) uh-oh what'd I do now...

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

Changing direction before the motor comes to a stop can weld or burn the 
contacts on the reversing relay (which on my tractor reverses the 
polarity on the field, not the armature).  That would fit with your 
statement that the tractor now wants to go backwards -- the motor's only 
field now comes from a bit of residual magnetism, and that's the last 
direction it ran.

Don't try to run it this way, or you'll damage the commutator and/or 
armature.  Visual inspection may reveal the problem.  The relay is 
located on the back of the vertical panel in the rear of the front 
battery compartment (at least it is on my E-15).

To confirm or test, disconnect one of the armature terminals.  Then with 
the rear wheels off the ground and trans in neutral (for safety), apply 
motor power and measure voltage across the field at the motor.  If it's 
zero, that's probably the problem.  New reversing relays are available 
from Bill Gunn.


David Roden - Akron, Ohio, USA
1991 Solectria Force 144vac
1991 Ford Escort Green/EV 128vdc
1979 General Engines ElectroPed 24vdc
1974 Honda Civic EV 96vdc
1970 GE Elec-trak E15 36vdc
= = = = = = = = = = = = = = = = = = = = = = = = = = =
NOTE: If you receive an email which exhorts you to "Send
this to everyone you know," you don't know me.
= = = = = = = = = = = = = = = = = = = = = = = = = = =