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Re: (ET) Fwd: E16 drive issues.



Yes, that WAS a diode. <VBG>Now that the primary issue is unveiled,a local RadioShack® should have suitable, better than OEM replacements.Here is a link to the OEM specs.

http://pdf1.alldatasheet.com/datasheet-pdf/view/76231/MICROSEMI/30S10.html

Replace both of them, of course. :)

RJ


On 10/2/2014 8:49 AM, Dean Stuckmann wrote:
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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