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Re: [EVDL] Jumpy Pots

9K views 73 replies 1 participant last post by  EVDL List 
#1 ·
Re: [EVDL] Jumpy Pots

I've had the same Curtis pot box in my EV for at least 3 years,
possibly up to 14 years old (I bought the car previously converted and
used). Currently my pot box is inside a weatherproof enclosure:

http://picasaweb.google.com/lh/photo/sby8m0mJDgKUTfUMTvYoVA?feat=3Ddirectli=
nk

it still works smoothly for me on a Kodiak controller

-Jon Glauser
http://jonglauser.blogspot.com
http://www.evalbum.com/555



soundboats <xxx@xxx.xxx.gov> wrote:
>
> Hello, I am trying to find out if anyone has had any luck in finding
> potentiometers that do not degrade with heavy use. I have tried the Cu=
rtis
> PB-6, a Chinese copy of the PB-6, and the Logisystem potboxes. All have
> suffered from the same degradation over time and last no more than 6-8
> months in heavy city and suburban driving (about 100 miles a week in stop
> and go traffic). The Logisystems potbox lasted only 2 months, the Curt=
is
> about 8 months, and the Chinese copy has been in for 6 months and showing
> signs of degradation.
> Initially all the potentiometers have a steady increase in resistance with
> the movement of the arm. However, the pots become progressively =93jum=
py,=94
> making driving difficult. I have measured the resistance and find that=
any
> small movement of the arm makes the resistance go up much higher for seco=
nd
> and then come down to what it should be. For example, if I have the ar=
m in
> a position that provides 1000 Ohms of resistance and move it just a few
> degrees the resistance jumps to 2500 Ohms before coming back down to 1200
> Ohms. This type of jump occurs at any setting of the arm and is not re=
lated
> to the controller. I have measured this jump when the pot boxes are
> disconnected from the controller as well.
> So, I am trying to find out if there is a brand of potentiometers that do
> not have this problem. I have found out that the resistance in these p=
ots
> is provided by a piecce of plastic, and I wonder if the plastic degrades
> with use. Any help would be welcome.
> Thanks,
> Tom Hruby
>
> --
> View this message in context: http://www.nabble.com/Jumpy-Pots-tp25648568=
p25648568.html
> Sent from the Electric Vehicle Discussion List mailing list archive at Na=
bble.com.
>
>
> _______________________________________________
> General EVDL support: http://evdl.org/help/
> Usage guidelines: http://evdl.org/help/index.html#conv
> Archives: http://evdl.org/archive/
> Subscription options: http://lists.sjsu.edu/mailman/listinfo/ev
>
>

_______________________________________________
General EVDL support: http://evdl.org/help/
Usage guidelines: http://evdl.org/help/index.html#conv
Archives: http://evdl.org/archive/
Subscription options: http://lists.sjsu.edu/mailman/listinfo/ev
 
#2 ·
Re: [EVDL] Jumpy Pots

Hi Tom,

Yup, pot boxes will do that.
The bests solution is to change over to Hall effect ones, if your controller
supports it. I have yet to see one of those degrade at all.

Matt

-----Original Message-----
From: xxx@xxx.xxx.edu [mailto:xxx@xxx.xxx.edu] On Behalf
Of soundboats
Sent: Tuesday, 29 September 2009 12:32 AM
To: xxx@xxx.xxx.edu
Subject: [EVDL] Jumpy Pots


Hello, I am trying to find out if anyone has had any luck in finding
potentiometers that do not degrade with heavy use. I have tried the Curtis
PB-6, a Chinese copy of the PB-6, and the Logisystem potboxes. All have
suffered from the same degradation over time and last no more than 6-8
months in heavy city and suburban driving (about 100 miles a week in stop
and go traffic). The Logisystems potbox lasted only 2 months, the Curtis
about 8 months, and the Chinese copy has been in for 6 months and showing
signs of degradation.
Initially all the potentiometers have a steady increase in resistance with
the movement of the arm. However, the pots become progressively "jumpy,"
making driving difficult. I have measured the resistance and find that any
small movement of the arm makes the resistance go up much higher for second
and then come down to what it should be. For example, if I have the arm in
a position that provides 1000 Ohms of resistance and move it just a few
degrees the resistance jumps to 2500 Ohms before coming back down to 1200
Ohms. This type of jump occurs at any setting of the arm and is not related
to the controller. I have measured this jump when the pot boxes are
disconnected from the controller as well.
So, I am trying to find out if there is a brand of potentiometers that do
not have this problem. I have found out that the resistance in these pots
is provided by a piecce of plastic, and I wonder if the plastic degrades
with use. Any help would be welcome.
Thanks,
Tom Hruby

--
View this message in context:
http://www.nabble.com/Jumpy-Pots-tp25648568p25648568.html
Sent from the Electric Vehicle Discussion List mailing list archive at
Nabble.com.


_______________________________________________
General EVDL support: http://evdl.org/help/
Usage guidelines: http://evdl.org/help/index.html#conv
Archives: http://evdl.org/archive/
Subscription options: http://lists.sjsu.edu/mailman/listinfo/ev


_______________________________________________
General EVDL support: http://evdl.org/help/
Usage guidelines: http://evdl.org/help/index.html#conv
Archives: http://evdl.org/archive/
Subscription options: http://lists.sjsu.edu/mailman/listinfo/ev
 
#3 ·
Re: [EVDL] Jumpy Pots

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#4 ·
Re: [EVDL] Jumpy Pots

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aW9uczogaHR0cDovL2xpc3RzLnNqc3UuZWR1L21haWxtYW4vbGlzdGluZm8vZXYKCg==
 
#5 ·
Re: [EVDL] Jumpy Pots

T24gTW9uLCBTZXAgMjgsIDIwMDkgYXQgNTo1MiBQTSwgQm9iIFJpY2UgPGJvYnJpY2VAc25ldC5u
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#6 ·
Re: [EVDL] Jumpy Pots

Out of curiosity, what is a PSA car?

Matt =


-----Original Message-----
From: xxx@xxx.xxx.edu [mailto:xxx@xxx.xxx.edu] On Behalf
Of Evan Tuer
Sent: Tuesday, 29 September 2009 12:58 AM
To: Electric Vehicle Discussion List
Subject: Re: [EVDL] Jumpy Pots

Bob Rice <xxx@xxx.xxx> wrote:
> Hi Tom and All;
>
> Here we go AGAIN! The #$@%^& pots are a crappy way to run =

> controllers/cars! And since the manufacturers can't seem to find =

> DECENT ones, or want to spend more than 29 cents for one, but they, =

> like the rest of us ,WEAR out!They keep on beating dead horses!

Who does? All the PSA cars use a conductive plastic pot on the throttle
pedal. They do not wear out.

Top tip: use a good quality conductive plastic pot designed for throttle
pedal position sensing. Spend at least $30, then forget about it, because
you'll never have to look at it again.

_______________________________________________
General EVDL support: http://evdl.org/help/ Usage guidelines:
http://evdl.org/help/index.html#conv
Archives: http://evdl.org/archive/
Subscription options: http://lists.sjsu.edu/mailman/listinfo/ev



_______________________________________________
General EVDL support: http://evdl.org/help/
Usage guidelines: http://evdl.org/help/index.html#conv
Archives: http://evdl.org/archive/
Subscription options: http://lists.sjsu.edu/mailman/listinfo/ev
 
#7 ·
Re: [EVDL] Jumpy Pots

Peugeot-Citroen (with double dot on the last e)
http://en.wikipedia.org/wiki/PSA_Group =



Cor van de Water
Director HW & Systems Architecture Group Proxim Wireless
Corporation http://www.proxim.com
Email: xxx@xxx.xxx Private: http://www.cvandewater.com
Skype: cor_van_de_water IM: xxx@xxx.xxx
Tel: +1 408 383 7626 VoIP: +31 20 3987567 FWD# 25925
Tel: +91 (040)23117400 x203 XoIP: +31877841130

-----Original Message-----
From: xxx@xxx.xxx.edu [mailto:xxx@xxx.xxx.edu] On Behal=
f Of Matt Lacey
Sent: Monday, September 28, 2009 11:14 PM
To: 'Electric Vehicle Discussion List'
Subject: Re: [EVDL] Jumpy Pots

Out of curiosity, what is a PSA car?

Matt =


-----Original Message-----
From: xxx@xxx.xxx.edu [mailto:xxx@xxx.xxx.edu] On Behal=
f Of Evan Tuer
Sent: Tuesday, 29 September 2009 12:58 AM
To: Electric Vehicle Discussion List
Subject: Re: [EVDL] Jumpy Pots

Bob Rice <xxx@xxx.xxx> wrote:
> Hi Tom and All;
>
> Here we go AGAIN! The #$@%^& pots are a crappy way to run =

> controllers/cars! And since the manufacturers can't seem to find =

> DECENT ones, or want to spend more than 29 cents for one, but they, =

> like the rest of us ,WEAR out!They keep on beating dead horses!

Who does? All the PSA cars use a conductive plastic pot on the throttle pe=
dal. They do not wear out.

Top tip: use a good quality conductive plastic pot designed for throttle pe=
dal position sensing. Spend at least $30, then forget about it, because yo=
u'll never have to look at it again.

_______________________________________________
General EVDL support: http://evdl.org/help/ Usage guidelines:
http://evdl.org/help/index.html#conv
Archives: http://evdl.org/archive/
Subscription options: http://lists.sjsu.edu/mailman/listinfo/ev



_______________________________________________
General EVDL support: http://evdl.org/help/ Usage guidelines: http://evdl.o=
rg/help/index.html#conv
Archives: http://evdl.org/archive/
Subscription options: http://lists.sjsu.edu/mailman/listinfo/ev


_______________________________________________
General EVDL support: http://evdl.org/help/
Usage guidelines: http://evdl.org/help/index.html#conv
Archives: http://evdl.org/archive/
Subscription options: http://lists.sjsu.edu/mailman/listinfo/ev
 
#8 ·
Re: [EVDL] Jumpy Pots

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dHA6Ly9saXN0cy5zanN1LmVkdS9tYWlsbWFuL2xpc3RpbmZvL2V2Cgo=
 
#9 ·
Re: [EVDL] Jumpy Pots

The conductive pots WILL last longer - auto OEMs use them for throttle
position sensors (TPS). They're spec'd at 1 million cycles (5 million
"dither" cycles) and run $30 to $50 or more.

Be sure to check the datasheets before ordering - MOST are guaranteed to
be linear between 10% and 90% of the listed range. So a 5K pot may not go
below 500 Ohms or above 4500 Ohms. The sample I tried goes down to 390
Ohms. This may (or may not) cause your controller to always be a little
bit ON. It may also trigger a "high pedal lockout" condition on your
controller. YMMV.

HEPI pedals are awesome! I'm currently using them with Zilla controllers.
I cut cone pedal off and am using it like a potbox with the original
throttle cable. The other is a complete pedal mounted on the floorboard.
Would be nice to disassemble the complete pedals and shove the guts in a
standard PB-6 box...

-Adrian


Evan Tuer wrote:

> All the PSA cars use a conductive plastic pot on the
> throttle pedal. They do not wear out.
>
> Top tip: use a good quality conductive plastic pot designed for
> throttle pedal position sensing. Spend at least $30, then forget
> about it, because you'll never have to look at it again.
>

_______________________________________________
General EVDL support: http://evdl.org/help/
Usage guidelines: http://evdl.org/help/index.html#conv
Archives: http://evdl.org/archive/
Subscription options: http://lists.sjsu.edu/mailman/listinfo/ev
 
#10 ·
Re: [EVDL] Jumpy Pots

Why not put a HE into a Curtis box... HE Pots are cheap enough, its just a
matter of finding one that has the right physical turning range...

http://search.digikey.com/scripts/DkSearch/dksus.dll?Cat=1967060&k=Hall%20ef
fect

Bob Sisson
1993 Geo Metro Convertible Project
Gaithersburg MD


_______________________________________________
General EVDL support: http://evdl.org/help/
Usage guidelines: http://evdl.org/help/index.html#conv
Archives: http://evdl.org/archive/
Subscription options: http://lists.sjsu.edu/mailman/listinfo/ev
 
#11 ·
Re: [EVDL] Jumpy Pots

Geez, Bob -- why so *jumpy*?

Bob Rice wrote:
> Hi Tom and All;
>
> Here we go AGAIN! The #$@%^& pots are a crappy way to run
>

_______________________________________________
General EVDL support: http://evdl.org/help/
Usage guidelines: http://evdl.org/help/index.html#conv
Archives: http://evdl.org/archive/
Subscription options: http://lists.sjsu.edu/mailman/listinfo/ev
 
#12 ·
Re: [EVDL] Jumpy Pots

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#13 ·
Re: [EVDL] Jumpy Pots

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#14 ·
Re: [EVDL] Jumpy Pots

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#15 ·
Re: [EVDL] Jumpy Pots

On 28 Sep 2009 at 15:25, Eric Poulsen wrote:

> You have the EV equivalent of "volume knob static" as seen in older
> stereo equipment. We used to fix it with something called "Color TV
> Tuner Cleaner" from Radio Shack.

My experience with this stuff is that in the long run it makes matters
worse. One can of spray I got at Radio Shack - which I think was called
exactly that - actually partly dissolved the interior of a pot in an audio
amplifier I had. Vorpal stuff.

The best, safest, and longest-lasting cleaner I know of for potentiometers
(be they in EV or audio use) is the original Cramolin Red. I still have a
tiny bottle of it that I got almost 20 years ago from Caig when they were
distributing it (Caig's current item, Deoxit, is not the same stuff).

You use it very, very sparingly; apply it with the tip of a toothpick
(assuming you can get to the inside of the control). If you use it right,
your kids will inherit your still-mostly-full bottle when you die.

When I checked on it just now, I learned that there is apparently no current
US Cramolin distributor. They seem to have had some kind of falling-out
with Caig (each side says the other was the bad guys). Reportedly you can
buy it directly from the factory in Germany, with really high postage
charges, or from farnell.com in the UK. It's now called Contaclean.

David Roden - Akron, Ohio, USA
EVDL Administrator

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#16 ·
Re: [EVDL] Jumpy Pots

David Roden wrote:
> On 28 Sep 2009 at 15:25, Eric Poulsen wrote:
>
>
>> You have the EV equivalent of "volume knob static" as seen in older
>> stereo equipment. We used to fix it with something called "Color TV
>> Tuner Cleaner" from Radio Shack.
>>
>
> My experience with this stuff is that in the long run it makes matters
> worse. One can of spray I got at Radio Shack - which I think was called
> exactly that - actually partly dissolved the interior of a pot in an audio
> amplifier I had. Vorpal stuff.
>
Yeah, I forgot to mention that it melts certain plastics, but I don't
think any part of the PB6 assembly is plastic, is it?

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#17 ·
Re: [EVDL] Jumpy Pots

soundboats wrote:
> Hello, I am trying to find out if anyone has had any luck in finding
> potentiometers that do not degrade with heavy use. I have tried the Curtis
> PB-6, a Chinese copy of the PB-6, and the Logisystem potboxes. All have
> suffered from the same degradation over time and last no more than 6-8
> months in heavy city and suburban driving (about 100 miles a week in stop
> and go traffic).

I'm having good luck with a VW throttle pedal. It's more complicated
than a simple 0-5k pot so you may have to reconfigure you controller to
talk to it. See
http://carrott.org/cgi-bin/twiki/view/ElectricMini/ThrottlePot I've also
got details there of the Zilla hall effect pedal and a throttle position
sensor style unit from metric mind.

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#18 ·
Re: [EVDL] jumpy Pots

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#19 ·
Re: [EVDL] Jumpy Pots

> Hi Tom and All;
>
> Here we go AGAIN! The #$@%^& pots are a crappy way to run
> controllers/cars! And since the manufacturers can't seem to find
> DECENT ones, or want to spend more than 29 cents for one, but they,
> like the rest of us ,WEAR out!They keep on beating dead horses! The
> Hall Effect setup(changing inductance, by throttle position) is
> Natures most perfect control; Magnetic fields simply DON'T wear
> out,period! Sorta like gravity! It NEVER lets up on us EVers! WHY the
> Hell hasn't controller builders haven't gone to OTHER than crappy
> pots, is beyond me? Let's go back to piston airliners and steam 20
> Century Limiteds? Feh! Had this argument with Peter Senkowsky about
> rebuilding Rapture Controllers. MINE that he did for me, uses a Hall
> Effect(it LOOKS like a solnoid) and works GREAT! Later he went BACK to
> a Pot box, on Dave O.'s Ranger, a step backward? EVery damn Radio in
> my house scrapes and scratches on the volume control! I know I'm
> SUPPOSED to throw radios away every 2 years, but STILL?
>
> Not an EE here, WHY is it harder to set up a controller to do Hall
> Effect RATHER than a Pot Box??Maybe it's a more difficult design?
> Maybe somebody that knows this stuff could chime in? Lee? Got yur ears
> on? Or answer this guyz question in the first place,m before I went
> into Rant mode?
>
> Seeya
>
> Bob
At least in industrial machines, they use "contactless" pots to measure
the position of swashplates in hydraulic pumps and such. They are
probably more expensive than the hall setup but you wouldn't have to
change the controller. I had a good source for suspension monitoring,
but that was years ago.
Something like this? http://www.murata.com/catalog/s30e1.pdf

Some are optical and some are magnetic, they just include a board in
them to simulate a resistor. More often called rotary position sensor.

Would something like this work? or is the voltage output not
appropriate. It depends on how the controller reads the pot :-(
http://delphi.com/manufacturers/auto/sensors/chassis/noncontact/

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#20 ·
Re: [EVDL] Jumpy Pots

Eric and others - thanks for all your input. It has has been a very
interesting discussion. I believe that the current pots (PB-6, their
replacements and the Honeywell ones) are made with a plastic resistive
element. This is what I was able to find in researching the issue. So, I
would steer away from using the TV cleaners.

I will explore some of the options suggested:
1. check out pots from fork lifts
2. check out throttle position sensors from autos
3. find out if the Logisystem controller I have can be run with a Hall
effect sensor
4. Check out cleaning the pots with Cramolin red. I still have my two old
pots that have gone bad, so cleaning one and checking it is no extra cost
for me.

Tom Hruby

Eric Poulsen wrote:
>
> David Roden wrote:
>> On 28 Sep 2009 at 15:25,
Eric Poulsen wrote:
>>
>>
>>> You have the EV equivalent of "volume knob static" as seen in older
>>> stereo equipment. We used to fix it with something called "Color TV
>>> Tuner Cleaner" from Radio Shack.
>>>
>>
>> My experience with this stuff is that in the long run it makes matters
>> worse. One can of spray I got at Radio Shack - which I think was called
>> exactly that - actually partly dissolved the interior of a pot in an
>> audio
>> amplifier I had. Vorpal stuff.
>>
> Yeah, I forgot to mention that it melts certain plastics, but I don't
> think any part of the PB6 assembly is plastic, is it?
>
> _______________________________________________
> General EVDL support: http://evdl.org/help/
> Usage guidelines: http://evdl.org/help/index.html#conv
> Archives: http://evdl.org/archive/
> Subscription options: http://lists.sjsu.edu/mailman/listinfo/ev
>
>
>

--
View this message in context: http://www.nabble.com/Jumpy-Pots-tp25648568p25663770.html
Sent from the Electric Vehicle Discussion List mailing list archive at Nabble.com.

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#21 ·
Re: [EVDL] Jumpy Pots

One issue is that the ROTARY MOTION of the BP-6 pots is not normal. Many
"Standard" pots have a 270deg turn from stop to stop... the Curtis PB-6 Pot
has a different range... Substituting a pot with more or less motion will
either cause a very touch throttle (what we are trying to get rid of) or a
throttle that can't reach FULL....

Does anyone know what the rotary motion of the Curtis is? Many of the HE
and rotary sensors can be ordered with different mechanical ranges, you just
need to know what to order...

Bob Sisson
1993 Geo Metro Convertible Project
Gaithersburg MD


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#22 ·
Re: [EVDL] Jumpy Pots

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ZWR1L21haWxtYW4vbGlzdGluZm8vZXYKCg==
 
#23 ·
Re: [EVDL] Jumpy Pots

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#24 ·
Re: [EVDL] Jumpy Pots

Tom Parker wrote:
soundboats wrote:
>> I am trying to find out if anyone has had any luck in finding
>> potentiometers that do not degrade with heavy use. I have tried the Curtis
>> PB-6, a Chinese copy of the PB-6, and the Logisystem potboxes.

All of these use the cheapest grade of pot possible. Look at them; they
are the same cheap unsealed $1 pots used in bottom-of-the-line consumer
products for indoor use.

> I'm having good luck with a VW throttle pedal. It's more complicated
> than a simple 0-5k pot so you may have to reconfigure you controller to
> talk to it.

The auto companies have used throttle pots for many years. Despite being
the grand masters of "cheap" :) they still use better quality pots than
Curtis. Often, they have two or even three pots in parallel, so failure
of one does not cause the system to fail. So, you should be able to use
one from existing cars.

Another option is to use higher quality sealed pots. For years I've used
the Allen Bradley type AB pot to replace the Curtis pot. A 20k pot has
just about the right resistance range (0-5k) when turned over a 90 deg. arc.

--
Lee A. Hart | Ring the bells that still can ring
814 8th Ave N | Forget the perfect offering
Sartell MN 56377 | There is a crack in everything
leeahart earthlink.net | That's how the light gets in -- Leonard Cohen

_______________________________________________
General EVDL support: http://evdl.org/help/
Usage guidelines: http://evdl.org/help/index.html#conv
Archives: http://evdl.org/archive/
Subscription options: http://lists.sjsu.edu/mailman/listinfo/ev
 
#25 ·
Re: [EVDL] Jumpy Pots

Does anyone have experience with the Kelly throttle? See
http://www.newkellycontroller.com/product_info.php?products_id=3D132 . It =
is
available 0-5k ohms or 0-5V. It is a modular unit with pedal and goes full
range in 36 degrees. It looks weatherproof and I am planning to use one on
my lawn tractor conversion.
Stephen Chapman

soundboats <xxx@xxx.xxx.gov> wrote:

>
> Bob,
> I tried to respond to your last posting, but my computer seems to lock up
> when I try to reply from an imbedded message.
> Anyway.. You are correct. The travel on the PB-6 is 75 degrees ( I have
> measured it), and most potentiometers are much higher. The ones I have
> been
> checking out are about 310 degrees. One option is to choose a pot with a
> 25K limit so the range comes out to about th 80 degrees I need.
>
> I should mention that I also tried out the new Logisystem pot box. It had
> a
> major problem in that the travel distance was 110 degrees and this was too
> large for my throttle cable (1987 Nissan pickup). Small cars may have a
> problem in using the Logisystems pot box because the travel in the thrott=
le
> cable is too short to accommodate an 110 degree range. However it also
> went
> bad after 2 months.
>
> I will try to put my pot box in an enclosure to keep it clean. Good
> suggestion from one of the other respondents.
>
> Tom Hruby
>
> soundboats wrote:
> >
> > Hello, I am trying to find out if anyone has had any luck in finding
> > potentiometers that do not degrade with heavy use. I have tried the
> > Curtis PB-6, a Chinese copy of the PB-6, and the Logisystem potboxes.
> All
> > have suffered from the same degradation over time and last no more than
> > 6-8 months in heavy city and suburban driving (about 100 miles a week in
> > stop and go traffic). The Logisystems potbox lasted only 2 months, the
> > Curtis about 8 months, and the Chinese copy has been in for 6 months and
> > showing signs of degradation.
> > Initially all the potentiometers have a steady increase in resistance
> with
> > the movement of the arm. However, the pots become progressively =93jum=
py,=94
> > making driving difficult. I have measured the resistance and find that
> > any small movement of the arm makes the resistance go up much higher for
> > second and then come down to what it should be. For example, if I have
> > the arm in a position that provides 1000 Ohms of resistance and move it
> > just a few degrees the resistance jumps to 2500 Ohms before coming back
> > down to 1200 Ohms. This type of jump occurs at any setting of the arm
> and
> > is not related to the controller. I have measured this jump when the p=
ot
> > boxes are disconnected from the controller as well.
> > So, I am trying to find out if there is a brand of potentiometers that =
do
> > not have this problem. I have found out that the resistance in these
> pots
> > is provided by a piecce of plastic, and I wonder if the plastic degrades
> > with use. Any help would be welcome.
> > Thanks,
> > Tom Hruby
> >
> >
>
> --
> View this message in context:
> http://www.nabble.com/Jumpy-Pots-tp25648568p25664594.html
> Sent from the Electric Vehicle Discussion List mailing list archive at
> Nabble.com.
>
>
> _______________________________________________
> General EVDL support: http://evdl.org/help/
> Usage guidelines: http://evdl.org/help/index.html#conv
> Archives: http://evdl.org/archive/
> Subscription options: http://lists.sjsu.edu/mailman/listinfo/ev
>
>
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_______________________________________________
General EVDL support: http://evdl.org/help/
Usage guidelines: http://evdl.org/help/index.html#conv
Archives: http://evdl.org/archive/
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#26 ·
Re: [EVDL] jumpy Pots

Electric Blue auto convertions wrote:
> I have only had 3 pots go bad so far and they were with in the first
> year. NOW if you see what Fork lifts use, the same thing only built
> much better and are still 5K ohm they last forever, BUT if you call
> Hyster, Cat, or Clark they want between 50 and 70 $ for the pot
> itself, is it worth it> thats up to you ..Wayne ev-blue.com

Try MIL style RV4. There are many manufacturers (like the Allen Bradley
type AB I mentioned, though Allen Bradley seems to have sold their pot
business to someone, so it's under a new name). Here's an example from
Digikey:

http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=RV4N253C-ND
http://www.precisionelectronics.com/MIL%20Style%20RV4%20PDF%20Download_files/MIL%20Style%20RV4.pdf

Sealed, gold plated terminals, stainless steel shaft, 25,000 cycle
rotational life, about $8.
--
Lee A. Hart | Ring the bells that still can ring
814 8th Ave N | Forget the perfect offering
Sartell MN 56377 | There is a crack in everything
leeahart earthlink.net | That's how the light gets in -- Leonard Cohen

_______________________________________________
General EVDL support: http://evdl.org/help/
Usage guidelines: http://evdl.org/help/index.html#conv
Archives: http://evdl.org/archive/
Subscription options: http://lists.sjsu.edu/mailman/listinfo/ev
 
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