Fw: (ET) E8 power control

["Herb Crary" <jhcrary comcast net>]

I have an E10M. All the small-frame tractors, as far as I know, have only
the slipping belt and three forward, 1 Reverse speed on the transmission. I
wonder how you would shift the transmission if you took the clutch out? The
E8 and E10 series are small-frame. I think that the E12 may be, but I don't
know. It would be interesting to me to know about that.

As far as the jackrabbit starts are concerned, that is pretty common. When
you have a new belt, it is especially noticeable. It is also common when 
you
first start it and begin to move. I don't know whether the heating of the
belt due to friction lessens the jumpy starts, but something does. You also
get so you can make gradual starts, go throgh tall grass at a slower speed,
or ease up close to obstacles by slipping the belt. It's just like learning
to drive a car with a clutch. A little harder to control, at least in the
beginning. At least I learned how in the 31 years I've had the E10M.

I would think that it might be a little harder to install a controller in a
small-frame unit. The construction of the dash and under it is different
from the large-frame type, I believe. I would suggest figuring out just
where to put things and how to mount them begore going too far. Good Luck.
Enjoy that ET.

Herb Crary
Boulder CO

----- Original Message ----- 
From: "Bob Murcek" <rmurcek geisinger edu>
To: <czach computer org>; <kmuldrew ucalgary ca>
Cc: <elec-trak cosmos phy tufts edu>
Sent: Wednesday, September 01, 2004 2:13 PM
Subject: Re: (ET) E8 power control


Ya know, putting a controller on an E8 is actually a bigger benefit than
putting one on one of the larger tractors since it allows elimination of 
the
clutch!

>>> Christopher Zach <czach computer org> 9/1/2004 4:44:12 PM >>>
Actually the speed control on all but the 15 and 20 was resistors in
series with the armature. The 15 and 20 also had field weakening for the
higher speeds along with circuitry to shut down FW if the current draw
to the armature became too high (say going up a molehill)

The E8 is pretty much as simple as you can get; one motor speed, with
the slack taken up by the clutch and a little transmission to provide
torque/speed. It runs the motor full armature voltage/fixed field.

I'd guess the current to be less than my E20, which is around 175amps
full blast (more with the snowblower, but I have yet to blow snow in
D2/Speed 8 :-) So a 150 amp controller would probably do it.

Chris

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