Hi,
Well its not the motor or the F relay, but I did find a resistor broke in half on
the small square varistor card. Could that be it? Does anyone know the values of
the components on that card? The one that is broke is smoked and I can’t
see a number.
Thanx for your help
Dean
On Sep 22, 2014, at 9:10 PM, RJ Kanary <rjkanary consolidated net> wrote:
Since this is an E-16 there is no longer a Field Reversing
relay. The only relay in the Field circuit on these is the Field Weakening
relay. With the Armature reversing contactors, the Field circuit became
much simpler.
RJ
On 9/22/2014 9:14 PM, CZ Unit wrote:
On 9/22/2014 9:01 PM, Dean Stuckmann wrote:
Hi,
Thanx for the help.
Here is some more info. I did the motor testing with the motor just on the
ground. So there was NO resistance from belts or the transmission. Could
that cause the runaway? But like I said it worked fine in reverse. In
reverse the torque made the motor jump as it got up to speed almost
immediately. In forward, the motor started at just a few RPM for the first
few seconds but then started revving up to runaway after about 5 more
seconds.
The problem is there is no power to the field when in forward. If the E16
uses the E15 type of field control there is a relay that is probably
welded shut in the reverse position. Thus when you try to go to forward
there is no field. If it's an E20 type controller then there are two
diodes that provide constant power to the field in forward and reverse.
One of them blew up.
The E15/20 motor is not really a shunt motor, it's a compound motor. There
is a shunt field that supplies almost all the power, and a small field in
series with the armature that acts as a compensating control, increasing
field strength past normal full field when the motor is heavily loaded.
With the normal field gone that little remaining field winding will
provide enough to spin the motor very quickly with no load and not at all
under any load.
C
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