Re: (ET) E-20 Controller failures.

["Christopher Meier" <mr23 mn rr com>]

Steve, can you share with us all the conditions that are tested by the
controller?
I'd like to see if any of us can spot something else that is missing.  I'm 
a
little
concerned that the controller (until this mod) wouldn't have detected a
break
in a field wire.

----- Original Message ----- 
From: "Steve Richardson" <scr echoweb net>
To: "Tom G" <wavetech superlink net>
Cc: "elec trak" <elec-trak cosmos phy tufts edu>
Sent: Monday, April 19, 2004 8:23 PM
Subject: Re: (ET) E-20 Controller failures.


> 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.
> > >
> > >
> > >
> > >_______________________________________________
> > >Elec-trak mailing list
> > >Elec-trak cosmos phy tufts edu
> > >https://cosmos.phy.tufts.edu/mailman/listinfo/elec-trak
> > >
> > >
> >
>
>
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