Re: (ET) E-20 Controller failures.

["Steve Richardson" <scr echoweb net>]

Hi Tom,

Since I issued the warning about the E-20 field we have learned that one of
the failures was on a E-15.  The E-20 failure was caused by the field not
being connected.  This suprised us so we are modifying the field control
part of the program to deal with a "Open Field" condition.

The new code will be available on our web site as soon as we get it
completed.
I don't know when that will be at the moment.

Thanks tom..

Steve

----- Original Message -----
From: "Tom G" <wavetech superlink net>
To: "Steve Richardson" <scr echoweb net>
Sent: Monday, April 19, 2004 3:26 PM
Subject: Re: (ET) E-20 Controller failures.


> Does the shorting of the field controll wires cause the problem with the
> controller?
> If so, would a fuse in line help from destroying the controller if for
some
> reason the field windings in the motor short out?
>
> tom
>
> At 01:43 PM 4/18/2004 -0700, you wrote:
> >Hello Everyone,
> >
> >Those customers of Alltrax who bought their controller for the E-20
> >Elec-Trak please do not run them !
> >
> >We have had what appears to be two failures of E-20 controllers that 
> >have
to
> >do with the field circuit.  Until we can resolve these failures it's not
> >wise to run them !!
> >
> >We suspect the wrong wires coming out of the motor are being connected 
> >to
> >the field connections on the controller.  The E-15 has two spade lugs on
the
> >side of the motor for the field winding.  The E-20 has four wires coming
out
> >of the side of the motor, two are for the field winding and two are for
the
> >internal thermal switch.
> >
> >Looking at the E-20 Schematic there is a connector called "P6" that
connects
> >these four wires to the wiring harness.  The field winding is connected
to
> >pins 1 and 2 of P6 and the wires coming out of the connector are labeled
#62
> >for pin 1 and # 36 for pin 2.  These are the wires that should be
connected
> >to the controller's field terminals.
> >MAKE SURE THESE WIRES REALLY GO TO THE FIELD WINDING.
> >The field winding has a resistance of about 12 ohms.
> >Pins 3 and 4 of P6 come out of the connector as wire numbers 5 for pin 3
and
> >number 25 for pin 4.  These wires are for the internal thermal switch 
> >and
> >should read as a short if the switch is a normally closed and should 
> >read
as
> >a infinity if the switch is normally open.
> >
> >If any E-20 customer needs a E-20 schematic I have scanned it in my
computer
> >as a Paint drawing and I will send it to you.   And yes we will have it
on
> >our web site soon.  Using paint you can modify the drawing later after
you
> >complete your installation and everything works.
> >
> >We are sorry for the inconvenience we may have caused some of our
customers,
> >but we feel it's better to bring it out now and deal with the problem
right
> >away to keep others from having the disappointment and extra work of
> >reinstalling another controller.
> >
> >Any questions please call me at Alltrax, 541-476-3565 or e-mail me at
home
> >at scr echoweb net.
> >
> >Thank You
> >
> >Steve
> >Alltrax Inc.
> >
> >
> >
> >_______________________________________________
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> >https://cosmos.phy.tufts.edu/mailman/listinfo/elec-trak
> >
> >
>