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RE: (ET) motor on E12S...
I have an E-15 and after the third or fourth time having the
forward/reverse relay contacts evaporated I replaced the relay with a
much heavier duty one that I found at the local surplus/used electrical
parts store. The new one is completely sealed and much higher current
rating, but is 24V - so I had to add an appropriate resistor in series
with the forward/reverse switch. Can't hear the relay switch like the
stock one either. Now I haven't tried to give it a max stress test, but
it appears to be holding up with the typical opps'es.
--joe
-----Original Message-----
From: Christopher Zach [mailto:czach computer org]
Sent: Thursday, February 12, 2004 8:42 AM
To: steves
Cc: elec-trak cosmos phy tufts edu
Subject: 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
>>>>>>>
>>>>>>>
>>>>>>>_______________________________________________
>>>>>>>Elec-trak mailing list
>>>>>>>Elec-trak cosmos phy tufts edu
>>>>>>>https://cosmos.phy.tufts.edu/mailman/listinfo/elec-trak
>>>>>>>
>>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>_______________________________________________
>>>>>>Elec-trak mailing list
>>>>>>Elec-trak cosmos phy tufts edu
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>>>>>>
>>>>>
>>>>>
>>>>>_______________________________________________
>>>>>Elec-trak mailing list
>>>>>Elec-trak cosmos phy tufts edu
>>>>>https://cosmos.phy.tufts.edu/mailman/listinfo/elec-trak
>>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>
>>
>>
>>
>>
>>
>
>
>
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