Re: (ET) start

["Christopher Zach" <czach computer org>]

Right, on the E20 they used the button to latch a relay to hold 1,2,3
contactors in for a fourth speed.Extremely helpfull as it is the most
efficient speed, without field weakening.

That being said, the power pulse still has me a bit confused: The E12's
didn't have FW circuits so the field is always at full power. It looks like
it simply bypasses the centrif switch to allow full armature current; was
there a reason they had the cent switch in there in the first place?

Chris

----- Original Message -----
From: "Elie, Larry (L.D.)" <lelie ford com>
To: "'Christopher Zach'" <czach computer org>; "Neil Dennis"
<wombat RealNS com>; "Elec-trak" <elec-trak cosmos phy tufts edu>
Sent: Wednesday, April 17, 2002 9:49 AM
Subject: RE: (ET) start


> As I recall, the 'power-pulse' on an E-20/I-5 is really only a
'cruse-control' or speed lock.  On E-12/E-15 it does give you a
'power-pulse' by going full field briefly, so the centrifugal switch has
time to spin up-- very nice when starting on hills.  The way the E-20 is
wired (I don't have one) that isn't necessary.
>
> Larry Elie
>
>
> -----Original Message-----
> From: Christopher Zach [mailto:czach computer org]
> Sent: Tuesday, April 16, 2002 9:49 PM
> To: Neil Dennis; Elec-trak
> Subject: Re: (ET) start
>
>
> I'd suggest getting the ET manual from Mr. Gunn. It's worth every penny
you
> will spend.
>
> Regardless, the E12 is a very simple version of the E20. No field
weakening
> (though what is that power pulse switch?) and only two relays, 1RTN and
> 2RTN. Since 1RTN is always used as the latch for the PTO, my guess is the
> contacts on the 2RTN relay (the one that requires the speed lever to be
> moved to neutral then speed in order to restart the tractor in the event
of
> a seat/brake interrupt) is in need of cleaning, or is misaligned.
>
> Since there is no FW circuit, Fwd/reverse is simply wired directly to the
> 1f-2f/1r/2r coil sets.
>
> Looks like "power pulse" button temp bypasses the centrifugal switch.
Anyone
> know what that is and why that is in there? All I can see the cent switch
> doing is opening the 2A coil, and putting a resistor in series with the
> motor.
>
> Odd.
>
> Chris
>
>
> ----- Original Message -----
> From: "Neil Dennis" <wombat RealNS com>
> To: "Elec-trak" <elec-trak cosmos phy tufts edu>
> Sent: Tuesday, April 16, 2002 4:42 PM
> Subject: (ET) start
>
>
> > No, it's an E-12 and has a few problems with relays overe the 15 yrs
> > I've had it.  Biggest problem has been with square ended microswitches
> > on speed control causing hard or sticky operation until I got smart and
> > radiused the operating buttons.
> >
> > BTW, when I'm tilling, the load meter is usually in the yellow or red.
> > And that's after I recalibrated the shunt (made it the correct length 
> > as
> > it was too long so always read higher than it should.
> >
> > wombat
> >
> >
> >
>