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4109Re: [solectria_ev] "Engine" missing.

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  • Wolf
    Jul 2, 2008
    • 0 Attachment
      logarithmic pots are also known as "audio taper" or "attenuator". :)

      Wolf
      *wags his tail*
      www.wolftronix.com

      > Bill:
      >
      > Linear vs non-linear (logarithmic)? can be determined with an ohm meter.
      >
      > 1)? measure the resistance between the two outer terminals.
      > (say for example it is about 5,000 ohms)
      >
      > 2)? Next, determine the degrees of rotation.? (270 degrees is a reasonable
      > number)
      >
      > 3)? Measure the resistance between one end and the middle terminal (the
      > slider)
      > at 0 degrees, 90 degrees, 180 degrees, and 270 degrees.
      >
      > 4)? If the POT is linear you should see the following:
      >
      > 0 degrees: 0 ohms
      > 90 degrees:? 1667 ohms
      > 180 degrees: 3333 ohms
      > 270 degrees: 5000 ohms
      >
      > If on the other hand, the resistance is all skewed to one end, you
      > probably have a logarithmic POT.
      >
      > You can choose other degrees of rotation of course.
      > Also, work to one significant figure.? Don't expect great accuracy.
      > If you are an experienced techie, sorry?for the detail.? Maybe someone
      > else will benefit.?
      >
      >
      >
      > I believe mine is linear.
      >
      > Good luck,
      >
      > Gary Carlson
      > gjc0@...
      >
      >
      > -----Original Message-----
      > From: Bill or Dorothy Swann <dbswann4@...>
      > To: solectria_ev@yahoogroups.com
      > Sent: Wed, 2 Jul 2008 2:20 pm
      > Subject: Re: [solectria_ev] "Engine" missing.
      >
      >
      >
      >
      >
      >
      > Hello Gary. I cannot argue with a P/N but, aren't pots, in some cases,
      > non-linear?
      > Bill s
      >
      > ----- Original Message ----
      > From: Gerard (Gary) Carlson <gjc0@...>
      > To: solectria_ev@yahoogroups.com
      > Sent: Wednesday, July 2, 2008 3:01:19 PM
      > Subject: Re: [solectria_ev] "Engine" missing.
      >
      > Greetings:
      >
      > A long time ago I replaced the potentiometer (POT) in my 1992 Force.
      > I removed the POT and found some numbers on it that corresponded to the
      > manufacturer' s part number.
      >
      > I was able to find a replacement part at www.digikey. com
      >
      > Another method is to measure the shaft diameter, thread size of the nut
      > and the resistance value between the two outer wires (when disconnected)
      > .? This will give you the specs. that you need.
      >
      > Sincerely,
      >
      > Gary Carlson
      > gjc0@...
      >
      > -----Original Message-----
      > From: Tom Hudson <tdhudson@klanky. com>
      > To: solectria_ev@ yahoogroups. com
      > Sent: Wed, 2 Jul 2008 11:41 am
      > Subject: Re: [solectria_ev] "Engine" missing.
      >
      > Our E-10 had this a while back and our Force just recently developed the
      > same thing. There is a spot on the accelerator potentiometer that is
      > where it sits during normal driving and I assume the wiper in the pot
      > eventually rubs this area until it starts to fail. That failure results
      > in jerky power when driving with your foot in that position. The remedy
      > is to replace the potbox potentiometer. Does anybody have a source for
      > these? I definitely need to replace mine ASAP.
      >
      > -Tom
      >
      > Will Beckett (PCSolutions) wrote:
      >>
      >> I once replace a bad potentiometer that controls the acceleration and
      >> would
      >> cause the car to jump a bit at specific speeds (around 45mph). It also
      >> could be a speed sensor but I would need to feel it to know for sure.
      >>
      >> .
      >>
      >>
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