RE: (ET) help

["Hazen, Dwight L" <hazen indiana edu>]

Sounds like you may have a field voltage problem. Do not run the motor
with out field foltage as it will draw large amounts of current through
a non or slow moving armature and you will burn up the windings.
Disconnect one of the large cables(armature)at the motor so you can test
for field voltage with out fear of smelling the dreaded $350 a hit
winding smoke. 

Dwight


Dwight L. Hazen, Indiana University, UITS 

Bloomington, In. 47408-7378

812-855-5367 IP phone 317-278-4014    

hazen indiana edu http://php.ucs.indiana.edu/~hazen/

Ham Radio wb9tlh arrl net http://wb9tlh.ampr.us


-----Original Message-----
From: Jeff Tickner [mailto:tickners valinet com] 
Sent: Saturday, January 04, 2003 7:21 PM
To: elec-trak cosmos phy tufts edu
Subject: Re: (ET) help

Tractor update, I put the charger on until I was seeing 42V and checked
my connections.
I use some stuff from Caig Labs to prevent corrosion that seems to be
holding
up well. Anyway I guess my motor is going bad.

So I put the speed control forward and L contactor stared clicking, but
the
motor started going intermittantly too, and then the contactor stopped
clicking
and the motor was going. SO I pulled back the speed control and tried it
again
and it worked after some clicks but when I pulled back the speed control
the
motor stayed on. I thought I must have welded the L contactor shut so I
turned
off the key and the motor still stayed on (the key switch usually does
work).
I finally popped the main disconnect and that stopped it. 

But I had to play with it so I pushed the main disconnect in and out and
the
motor turned on sometimes, and sometimes it didn't, and then the motor
stayed
on WITH the main disconnect OUT. I still had the charger plugged in so I
pulled
the plug and that stopped the motor.

So I would guess I welded the L contactor shut, I guess the key wouldn't
affect
that. The motor must need some work, maybe new brushes? 
and that creates a big load? 
creates a very high power requirement for starting? 
I would guess I need to spend some quality time with the tractor looking
over
the wiring. Is there a wiring diagram that shows every wire and where it
should
go?

I don't have a garage so I'll be laying in the snow pulling my motor and
checking
my wiring, oh joy. Thanks for the help so far, any additional advice
would be
appreciated!!!