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Discussion Starter #1
I have one of those "gas pedals" that is a 0-5K pot.

I have a light bulb as a precharge resistor.

A few times I have turned the light-bulb on and it did not go out.

So I started the circuit anyway, and the motor went on without any
depression on the pedal.

Then I would press the pedal, and release and the motor would stop.

Any ideas?

Thanks
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Discussion Starter #2
This same thing has happen to me several times about 5 years ago, and fix =

it, so it would not happen again.

At first, I thought the spring on the Curtis pot was getting weak or may no=
t =

be strong enough, so I rotated it a little and fasten it down with a small =

steel aircraft wire clamp using one of the cover screws.

This work for some years, until it did it again, so maybe the carbon pot =

wiper was leaving a carbon trail on the pot, so I clean it with some =

electronics spray cleaner and also lubricate the throttle cable with a dry =

type silicon.

This also work for a long time, until it act up again. This time I change =

the pot with a spare one I have in stock. The old one look good, so I kept =

it as a spare.

Again, some time later, it did it again. So I got out the Zilla manual and =

check the voltages that go to the pot and they are right in specifications. =

It seems every time I touch the pot or work on it, it would work again for =
a =

while.

Then one time, I went into town and park the EV, came back out and the EV =

would not start up. The precharge light would not come on, and I recycle =

the ignition key several times, check all the 12 volts voltages and check t=
o =

see if the battery voltage is at the main contactor before before it was =

close.

If you do not have the battery voltage at the main contactor, then you will =

not get a precharge, but I had that voltage there.

So I now had the EV tow to my shop and it started to work again. It again =

fix it self by just touching it.

Again I went to a Caf=E9 and it did the same thing, but this time for some =

reason I look down at the accelerator peddle and the floor mat was laying o=
n =

top of it, which means the accelerator pot did not go below the ohms =

required for the motor to start and the controller will not start up unless =

you are below a minimum resistance.

So to start up the EV, all I had to do was pull the floor mat back a little =

and I never had any problem after that.

Roland

Roland


----- Original Message ----- =

From: "m gol" <[email protected]>
To: <[email protected]>
Sent: Saturday, September 08, 2007 10:46 AM
Subject: [EVDL] pot pedal going bad?


> I have one of those "gas pedals" that is a 0-5K pot.
>
> I have a light bulb as a precharge resistor.
>
> A few times I have turned the light-bulb on and it did not go out.
>
> So I started the circuit anyway, and the motor went on without any
> depression on the pedal.
>
> Then I would press the pedal, and release and the motor would stop.
>
> Any ideas?
>
> Thanks
> _______________________________________________
> For subscription options, see
> http://lists.sjsu.edu/mailman/listinfo/ev
> =


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Discussion Starter #3
I've noticed if I don't drive the EV for a week at at
time, and start driving, sometimes it sort of jumps
and bucks, sorta like a ICE with a clogged fuel
filter. When this happens, I turn off the controller,
and literally pump the foot pedal several times (at
least 20) and then startup the controller, and all is
well. I think dust and dirt somehow settles in the
control pot and the wiper on the potentiometer get
dirty in my situation anyhow. Try the pumping trick
with all the electronics off, and make sure your
control pot is also going all the way to home
position, I did have a spring get weak, and not pull
the pot lever all the way back to zero once. Hope
that helps you out.


--- m gol <[email protected]> wrote:

> I have one of those "gas pedals" that is a 0-5K pot.
>
> I have a light bulb as a precharge resistor.
>
> A few times I have turned the light-bulb on and it
> did not go out.
>
> So I started the circuit anyway, and the motor went
> on without any
> depression on the pedal.
>
> Then I would press the pedal, and release and the
> motor would stop.
>
> Any ideas?
>
> Thanks
> _______________________________________________
> For subscription options, see
> http://lists.sjsu.edu/mailman/listinfo/ev
>


M. Barkley

www.texomaev.com

http://www.austinev.org/evalbum/1135


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