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RE: (ET) motor on E12S...
I'll have to try that. I first put an inline fuse after frying the second
relay. thereafter and still I blow 35cent fuses instead of $20 relays. I
also
found a 48v relay at Hosfelt for $2. It is totally sealed but physically
smaller so has a smaller airgap than the original open relay. we've tried
several other things to help absorb the spike, like a diode mounted to the
frame and I think the latest my friend tried was a capacitor to delay the
current reaching the relay until after the points have opened. All to no
avail.
Can you provide the specs or part number of the relay you are using and
the
value of the resistor?
thanks much,
dave
> 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
> >>>>>>>
> >>>>>>>
> >>>>>>
> >>>>>>
> >>>>>>
> >>>>>>_______________________________________________
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> >>>>>>Elec-trak cosmos phy tufts edu
> >>>>>>https://cosmos.phy.tufts.edu/mailman/listinfo/elec-trak
> >>>>>>
> >>>>>
> >>>>>
> >>>>>_______________________________________________
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> >>>>>Elec-trak cosmos phy tufts edu
> >>>>>https://cosmos.phy.tufts.edu/mailman/listinfo/elec-trak
> >>>>>
> >>>>
> >>>>
> >>>>
> >>>>
> >>>>
> >>>
> >>
> >>
> >>
> >>
> >>
> >
> >
> >
> > _______________________________________________
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> >
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