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Re: (ET) I-5 foot pedal .vs. cruise control
More experimentation... D1 in cruise slow (no field weakening) seems
to be pretty good for mowing with the I-5 as long as the cutters are
razor sharp. Thanks for all the info, guys!
I have noticed an interesting phenomena, though. If I'm at a dead
stop in D1, and I jam the foot pedal down, the tractor will start
rolling along, and eventually when it gets going fast enough it
suddenly surges to a higher speed and the green dash light goes on.
HOWEVER... I don't actually have to wait for the speed to inch up to
"green light" range, I can just push the cruise control button as soon
as I'm rolling, and the tractor will instantly speed up and the light
will come on.
Turning OFF the cruise is not so smooth - the motor seems to want to
keep going until the tractor's been dragged to a dead stop by the
friction brake, so it's actually quicker to stand up and release the
seat switch.
--Charlie
On Wed, Jun 6, 2012 at 3:59 PM, John J Casey <jjcrmc verizon net> wrote:
> You've gotten good advice. I can't comment on the operation of the I-5
> but
> did something that may be useful. Have a typical E-12 but with an E-20
> traction motor. Whatever motor used I always found mowing in L1 too slow
> and
> in D1 too fast. With help from list members I installed an E-15 double
> sheave pulley on the E-20 motor...mowing in L1 is just a bit slower but
> in
> D1 it is perfect.
> Cheers, Jack
>
> On Jun 5, 2012, at 2:58 PM, Charlie wrote:
>
> Great information, Brian, thanks!
>
> I do have a fast/slow switch. Now that I know what it actually does,
> I will experiment some more! Maybe D1 at slow will do the job.
>
> --Charlie
>
> On Tue, Jun 5, 2012 at 2:07 PM, Brian E. Haines <bhaines nycap rr com>
> wrote:
>
> Yup. Nail on the head.
>
>
> Running the armature at full voltage and field at full voltage is the
> most
>
> efficient use of power in a stock ET. If you lower the armature, you're
>
> using the toaster to add resistance, lower power to the drive motor and
>
> create heat. If you lower the field then the drive motor acts like a
> series
>
> wound motor and more power is used...and greater speeds. (And generating
>
> heat by using the resister on card 4)
>
>
> Some tractors had a fast/slow cruise switch. Start the cruise in "slow
>
> cruise" it would be full armature, full field. Flip the switch to "fast
>
> cruise" and it would add in a resister to the field making it go faster
> (and
>
> generate more heat).
>
>
> With a stock I5 you're kind of stuck with just "cruise" a little too
> slow
>
> and a little too fast.
>
>
> If you're willing to do some modifications you could add a fast/slow
> cruise
>
> switch. It will help a little.
>
>
> If you willing to do a LOT of modification then you could put in an
>
> electronic controller. No toaster, no card 4. Pretty much you use the
>
> power you need and very little gets wasted. Also, you can wire in a
> cruise
>
> button and a potentiometer and cruise at any speed you like. Wiring in a
>
> cruise to an electronic controller is a pain though. WAAAAY easier to
> put
>
> in a hand speed controller. Where ever you put it is how fast it goes.
> Less
>
> wiring, less to go wrong, but some people love the foot pedal. (I'm not
> one
>
> of them; )
>
>
> Personally I hate the toaster and card 4. Converting energy to heat
> annoys
>
> me unless I'm making grilled cheese. And anything that wastes my
> precious
>
> power has to go.
>
>
> B
>
>
> On 6/5/2012 1:28 PM, Charlie wrote:
>
>
> It was mentioned here a couple of weeks ago that the OEM cruise
>
> control doesn't provide the top "field weakening" speeds, and that
>
> seems to be true with my I-5. It actually slows down when I put the
>
> cruise on.
>
>
> I'm guessing that the motor runs cooler and more efficiently when it's
>
> got the armature field weakened, but I'm remarkably uneducated
>
> concerning electric motor control (and I know you guys aren't) so
>
> please tell me if I'm being stupid.
>
>
> If I'm in D1 cruise it's a little fast for good mowing speed. D1 on
>
> the foot pedal is WAY too fast. L with cruise is too slow for me, and
>
> L with the foot pedal all the way down is just right (said
>
> Goldilocks).
>
>
> But my size eleven gunboats are kind of large for the I-5's foot
>
> pedal, and the spring seems awfully stiff. If I ride in
>
> cruise-control, I won't get the most efficient battery use or the best
>
> speed, but I have trouble maintaining constant pressure on the pedal
>
> for an hour while I mow the open part of the field.
>
>
> What do you guys think? Has anybody else had difficulty with this, or
>
> am I just dealing with an unusually stiff spring?
>
>
> --Charlie
>
>
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