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Re: (ET) E12S and a Curtis controller??
Dave,
For sure you better gave three separate grounds!
Craig is correct..
Steve
scr echoweb net
----- Original Message -----
From: "Dave & Debbie Barden" <daveb seanet com>
To: <hazen indiana edu>; <agp vt edu>; <elec-trak cosmos phy tufts edu>
Sent: Saturday, June 28, 2003 2:20 PM
Subject: RE: (ET) E12S and a Curtis controller??
> my new chargetek charger, the one that charges 3 12v batts, came in the
mail
> yesterday. My friend Craig has his doubts that it will work the way I
think it
> will. That is NOT having to split the pack into 3 pairs of 6volt batts.
I
> didn't ask but it sure sounds to me as though this charger does NOT have
> a
> common negative rather 3 separate negatives. Craig's point was that if I
don't
> split the pack and the charger uses a common ground I have an immediate
dead
> short. Anybody out there know for sure.
>
> this discussion about motors and controllers has indeed been informative.
>
> dave
> Seattle
>
> > I agree good discussion! IF the motors will take the extra voltage and
> > it sounds like they will then taking out the charger and replacing it
> > with a 6 volt battery sounds like the way to go. If you do not want nor
> > need the extra voltage just leave it the way it is. Using a modern
> > controller will make the number of connections less and we can use
> > larger wire and better connectors than the factory did. The bottom line
> > is we may not need the extra battery to make up for all the voltage
> > drop
> > in the old system. Has anyone put a voltmeter on the motor connectors
> > and driven up a hill to see how much it drops under load? My guess is a
> > lot. Even on cold days the wire bundles gat warm and the contactor
> > cabinet is warm, heat is loss. The voltage at the motor is what makes
> > it
> > go not the voltage at the battery terminals.
> >
> > It will be good to have a controller that we can program to set the
> > acceleration and deceleration! This is going to be fun!
> >
> > The 36 volt battery charger that charges three 12 volts battery systems
> > looks interesting. My E20 wants one!
> >
> > Steve, yes we need cruise control!
> >
> > Dwight
> >
> > Dwight L. Hazen, Indiana University, UITS
> >
> > Bloomington, In. 47408-7378
> >
> > 812-855-5367 IP phone 317-278-4014
> >
> > hazen indiana edu http://php.ucs.indiana.edu/~hazen/
> >
> > Ham Radio wb9tlh arrl net http://wb9tlh.ampr.us
> >
> >
> > -----Original Message-----
> > From: Andrew Poush [mailto:agp vt edu]
> > Sent: Saturday, June 28, 2003 10:33 PM
> > To: elec-trak cosmos phy tufts edu
> > Subject: Re: (ET) E12S and a curtis controller??
> >
> > Wow. I am really pleased with the discussion that spun off my email.
> >
> > David Roden is pretty accurate in what he says about Mark Hanson's
> > modifications. I should know because I own one of the two E-15s Mark
> > modified. And I did my graduate studies in DC-DC power conversion and
> > motor control. Mark did use two identical controllers, one for the
> > drive and one for the PTO. The battery pack is 48V and the accessories
> > are tapped off the pack. I can put the tractor in any gear, vary the
> > speed command so that any voltage from 0 to 48V is applied, and it is
> > efficient and smooth. I never need to change gears while I mow. I can
> > throttle down and switch to reverse in a blink, even if the tractor is
> > not quite at rest. I never use the foot brake while mowing since the
> > reverse is so handy. But my top speed is 4 mph whereas before the
> > modifications it would have been 10 mph. I don't really NEED the speed
> > for mowing and snow-plowing. I just want it for the fun of giving my
> > daughter faster rides.
> >
> > David did say that he would trust that since Mark put a second
> > controller on the PTO that it must indicate that running the mower deck
> > at 48V is too risky to attempt. In fact, Mark told me just the
> > opposite. The mower motors can be run at higher voltage with little or
> > no risk. I generally run them at 36V but crank them up when the grass
> > gets very thick. I have run them that way for over a year and never
> > tripped the thermal overload or gotten the motors hot enough that I
> > couldn't hold my hand on any one of them indefinitely. This E-15 is a
> > great ride and I only look forward to it getting better if this kit
> > Steve's company is developing can be made affordable.
> >
> > One more feature I would like to see on a controller for the ET is
> > cruise control. The ability to set a cruise speed and then reduce
> > speed (or even reverse direction) for maneuvering around obstacles and
> > then resume the preset speed would be very useful to me. Currently, I
> > can set a speed but cannot resume it after changing speed. The speed
> > command input to the controller is a slider potentiometer next to the
> > forward/reverse switch (rather than a foot pedal). I am not sure that
> > a foot pedal is compatible with implementing a cruise control cost
> > effectively. What do you think, Steve? Is cruise control a
> > possibility?
> >
> > Andy
> >
> > PS - I will never go back to a 36V battery pack.
> >
> >
> >
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> >
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