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4108Re: [solectria_ev] "Engine" missing.

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  • Gerard (Gary) Carlson
    Jul 2 5:48 PM

      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

      -----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.


      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.


      Gary Carlson

      -----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.


      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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