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Re: (ET) Thinking out loud - Controller

That is definitely true, especially in the higher gears, the current that pounds thru on the l/h transition is pretty significant, I doubt it would last long with a binary throttle.

My real point is that if I were to choose an electronic speed control I would probably buy the Elec Trak specific one, but I don't see the utility of infinite speed, especially if I managed to fry one it would be a pricey lump to change out, where a relay logic implementation of essentially the stock control strategy one could use 24 volt relays and never be out of pocket more than 20 bucks at a time.

KG

On Feb 11, 2011, RJ Kanary <rjkanary consolidated net> wrote:

             I could be wrong about this {Imagine THAT.}, but I feel the reasoning behind the armature resistance is best explained thusly..............
There is going to be a MAJOR inrush current nailing the armature at every start if these resistors are not present.That can't be an approach to long life and prosperity. :(
Secondly those armature resistors provide a smoother, more controlled launch, but were never intended to be a long term speed selecting device.

[ Turns a whole lotta watts into BTUs.]

(And if you ever get to operate an E-20 / I-5 with the eight speed Apollo Era controls that third armature resistor makes a noteworthy difference in smoothness and precision of control while maneuvering.)

RJ

stupidemail5 lycos com wrote:
I have been running my E12S with no control and 2 switches all winter. A DPDT center ON wired so that down is off, middle is start/low and up is high. DPDT center OFF in place of the f/r relay. Yes it is a death machine, but it made me think that wiring the whole thing with a couple of self holding relays it could be done safely. they actually make delay relays that would make it slick.

My thinking is that I never use lower speeds except for current control, and now some snow blowing. I choose the gear I want and pretty much go full speed. The lack of torque with the resistors makes the lower speeds pretty lame.

I could probably implement with the stock switch array.

The RTN deal is the only hard part, and actually with self holding relays and a 3PDT center off for field reversing that should be OK. The third pole would be in the string for the main start relay so it would drop out when you go to the center position.


Probably a 'go fast' button for field weakening

KG




On Feb 10, 2011, David Brandt <ev_dave13 yahoo com> wrote:


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