Here is a photo.
Regards
Dean Stuckmann
------------------------------------------------------------------------
*From: *"Dean Stuckmann" <dstuck lakefield net>
*To: *"Dean Stuckmann DStuckmann" <DStuckmann mantool com>
*Sent: *Thursday, October 2, 2014 6:12:32 AM
*Subject: *Fwd: (ET) E16 drive issues.
Begin forwarded message:
*From: *RJ Kanary <rjkanary consolidated net
<mailto:rjkanary consolidated net>>
*Subject: **Re: (ET) E16 drive issues.*
*Date: *October 1, 2014 at 8:10:15 PM CDT
*To: *Dean Stuckmann <dstuck lakefield net
<mailto:dstuck lakefield net>>, "Ele >> et"
<Elec-trak cosmos phy tufts edu
<mailto:Elec-trak cosmos phy tufts edu>>
An image would be helpful. :) I suspect the failed
component is one of the field diodes.
RJ
On 10/1/2014 9:06 PM, Dean Stuckmann wrote:
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 <mailto: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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