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Thanks for the response. I don't want
seven fixed speeds, but thought that using the existing speed lever for
forward-off-reverse together with a foot pedal "throttle" would be good for my
purposes.
When I put a 4QD controller in mine I did make a
virtual potentiometer out of the existing switches, but I've had second
thoughts since there are only seven fixed speeds. The seven seem to be
enough, but I feel like I'm missing something! The Alltrax guys could
certainly come up with a diagram for doing this with their controller.
There are a couple of complications, like some of the switches being normally
open and others being normally closed (I guess it wouldn't be a big deal to
replace them all...), and that you don't want the controller input to open
circuit while changing speeds or the controller will think the pot went bad
and shut down.
>>> "Pieter Litchfield"
<plitch attglobal net> 4/19/2004 9:08:10 AM >>>
I assume by
"Start" switch, you mean the switch referred to in the Alltrax
owners
manual - " The throttle switch must open when the throttle reaches
the off
position. The off position is 250 ohms or less, wide open throttle
is
4.5K and above. At 9.5K and above the controller gets a throttle out
of
range error and shuts off the output?" Apparently in addition to
the pot, a
seperate throttle switch is necessary. I have the
controller with the
Alltrax "factory" pot which has a spring loaded
return-to-off and a built in
throttle switch. For my use (mainly
working with a bucket loader) a "gas
pedal" would be more convenient than a
hand throttle. But for mowing, a
hand set throttle would be
nice.
Question: Could we use the forward-reverse and speed
switches on the
existing GE hand "throttle" to control the reverse and
throttle switch
functions of the Alltrax controller without the necessity
of installing new
switches? While all the "steps" in the throttle
would be meaningless, at
least it would be convenient and ergonomically
similar to what we are using
now.
Jon - I'm still think over the
engineering. Like you I'm a bit concerned
about tearing into the mass
of wiring, even with lots of diagrams. I'll be
sure to give you
plenty of advance notice of the "Alltrax event" at
my
house.
-----Original Message-----
From:
elec-trak-bounces cosmos phy tufts edu
[mailto:elec-trak-bounces cosmos phy tufts edu]On
Behalf Of Rod Hower
Sent: Sunday, April 18, 2004 9:24 PM
To:
Oasis654 aol com; elec-trak cosmos phy tufts edu
Subject: Re: (ET) ET
running, thanks Alltrax
Jon,
I used 3 switches, Start, Fwd/Rev
and Key along
with a 5k pot (readily available at radio shack).
I did
not use any of the original wiring.
I drilled holes for the start and
fwd/rev switch
and the pot. The pot is like cruise control since
its
just a rotory type. Everything is mounted on the
dash, just
drilled some holes for the new components.
Someday I might actually use
this thing for mowing,
but for now it's a fun EV toy.
Rod
---
Oasis654 aol com wrote:
>
> In a message dated 4/17/04 9:22:24
PM,
> rodhower ameritech net writes:
>
> <<
Connecting the controller was
> pretty easy compared to the tangled mess
of wires
> that originally ran the motor. 9 wires to the
>
Alltrax
> ,two switches and a pot is all it takes.
>>
>
> hi rod, congrats on the new controller. i'm
heading
> in that direction too,
> but so far have been chicken to
go for it. my
> electrical knowledge is quite
>
limited. was it easy to determine which 9 wires had
> to be saved
and connected?
> thanks and good luck with new machine. we're
all
> apparently interested in
> hearing more. jon k albany
ny
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