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Re: (ET) motor on E12S...



Well, true. The E20 does use a set of nice big contactors as opposed to an itty-bitty relay.

Has anyone thought about replacing the relay with a set of contactors to reverse the field? I'm not saying duplicate the E20's system, but just use something a lot bigger than a relay point to switch the field polarity (and take the spikes)

Thoughts?
Chris


steves wrote:
I'm remembering more about the E12S...

It is the same wiring as the E15 except it doesn't have the field weaking
circuit (the extra FWD speeds). It does reverse the field and that relay is
easy to fry. BTW I notice I don't have to be so gentle with FWD/REV with 
the
E20 (found out by accident). I still do seem to recall the E12S uses an E15
motor.

Let us know how the controller works! I have another E12S in sad shape - it
would be nice to simplify the wiring and get it running.

- SteveS


----- Original Message ----- From: "Dave & Debbie Barden" <daveb seanet com>
To: <rjkanary nauticom net>; <ssawtelle fcc net>; <>; <daveb seanet com>
Sent: Thursday, February 12, 2004 2:10 AM
Subject: Re: (ET) motor on E12S...



Thanks.  It is looking more and more like the Alltrac controller will work

with

the E12S motor.  The E12 does use field switching and my machine continues

to

suffer welded contacts and blown fuses whenever the motor is stopped to

change

directions and the field collapses sending a surge of current back up the

line,

thus my concern with the field losing current.  However I understand from

Steve

Richardson that their controller does monitor have over current

protection.  I

am verifying also with him that the controller will switch the field for
forward reverse.

thanks again for all your responses and increasing my understanding of

motors.

dave
seattle


     The field current requirements for the motors in question is for

all

intents and purposes identical. In all the twenty some years that I have
operated either the late model  I-5 , or the earlier model eight speed

E-20,

I have yet to encounter a situation where field voltage was lost.
    Since I do not have any information on the solid state controller

you

are planning on utilizing, I can't offer an opinion on whether or not it
offers armature overcurrent protection.
    I do feel that the chances of a loss of field incident are slight.

Few

people ask their tractors to do what I ask of mine. If anyone should

have a

meltdown, it should be me.
  If your tractor uses field switching for reversing, instead of

armature

reversing, I would recommend changing it over. It's not that bad of a

job,

especially if you have the Manual, and an organ donor tractor.

----- Original Message ----- From: "Dave & Debbie Barden" <daveb seanet com>
To: <rjkanary nauticom net>; <ssawtelle fcc net>;
<elec-trak cosmos phy tufts edu>
Sent: Tuesday, February 10, 2004 10:18 AM
Subject: Re: (ET) motor on E12S...



not being too electronically literate I need some help getting from A

to

C, A

being my motor has a shunt which supplies the field.  To get to C I

have

to be

sure that the sep-X controller will work with that kind of field.  One

of

Richardson's emails talked about their needing to modify the

controller to

work

with small current of the E15's field windings 3 amps instead of 30 I

think he

said.  Judging from the small wires going to the field of the E12S

motor

and

the fact that it uses a shunt I would guess that the current would be

pretty

low as well???  And if steve is correct that the E12S uses an E15 like

motor it

should work.  What I am really worried about is what will happen if my

field

loses current (blown fuse or fried relay) will the armature still be

getting

current from the controller???

thanks,
dave



   The only wound field traction motor that does not possess the

extra

winding is the one used in the E-12 CA through HA models . This

category

includes the E-12 M.

      Note that in the Homeowner's Service Manual, the E-12 S

armature

terminals are identified as A1 and S2, indicating the presence of a

'shunt'

winding.

----- Original Message ----- From: "steves" <ssawtelle fcc net>
To: <elec-trak cosmos phy tufts edu>
Sent: Tuesday, February 10, 2004 5:07 PM
Subject: Re: (ET) motor on E12S...



As I understand it - The E12S is basically an E12 with an E15

motor.

The

wiring is different than an E12.  I would think, based on this, it

would

work.  Someone correct if I'm wrong...

- SteveS

----- Original Message ----- From: "Dave & Debbie Barden" <daveb seanet com>
To: <plitch attglobal net>; <thumphrey mynra com>; <>
Sent: Tuesday, February 10, 2004 8:38 AM
Subject: (ET) motor on E12S...



I would really like to get the new Alltrax controller for my

E12S.

But

the

discussions on this list have all centered around the E15 and

E20.

My

ultimte

question is will the alltrax work with the E12S  motor?  Also

what

does

the S

in E12S signify?  I thought I read that the E12S is a "compound"

motor

aka "shunt motor" right/wrong???

Bottom line, will the sep-X controller work on an E12S?

thoughts??

thanks,
dave


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Elec-trak cosmos phy tufts edu
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