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722Re: Locomotive current demands

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  • Bim Bousman
    Dec 31, 1999
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      Answering a question with a question...

      What do you use to measure current???

      I know that it is a milliammeter or ammeter, but do you recommend and
      manufacturer / model number, etc???

      Is there something that I can get at Radio Shack or elsewhere for a
      reasonable price to use at home???

      Bim B

      BJKRONEN@... wrote:
      > From: BJKRONEN@...
      > Hi All:
      > During the summer, I raised this topic and got about as much interest in it
      > as watching the grass grow. But that was the off-season for trains, and the
      > list did not have the 100 plus members it does now.
      > I still feel the topic is of value, especially to those who only infrequently
      > run their locomotives. Or worse, run them and watch the motors burn up in a
      > few minutes.
      > I'll try the issue one more time. While we have become believer's in it down
      > here, I would really be interested to see if our findings compare with anyone
      > else's.
      > Bill Kronenberger
      > Houston
      > -=-=-=-=-=-=-=- Summer Rerun Follows -=-=-=-=-=-=-=-
      > To All:
      > We have made some observations here, with the combined ownership of some 40 z
      > scale locomotives (4 of us), and I wonder if anyone else has noticed it?
      > In an effort to determine the safe operating range for our locomotives (some
      > locos where getting really hot), we ran across the following test:
      > a. Put the loco on a short test track against a soft bumper at one end
      > b. Turn the power up until the loco spins its wheels (only do this for a
      > second)
      > c. Note the current draw from the powerpack (in milliamps)
      > What we found is:
      > Marklin locos draw from 300 to 400 milliamps at 6 volts
      > Marklin locos in bad need of cleaning/oiling draw 400-500 milliamps at 6 volts
      > and - they run hot....VERY hot
      > and - when oiled properly, they drop back to 300/400 milliamps
      > MicroTrains F7's draw 400-500 milliamps at 6 volts
      > sorry, we didn't have one in bad shape to identify its overcurrent points
      > What we are looking for it a go/no-go test at shows BEFORE we put a loco out
      > there and burn it up.
      > Since motor current demands are affected by load (number of cars/wagons)
      > there is no clear definition of what a "standard" load might be. We "think"
      > wheel slip represents the maximum load condition on a loco. We "think" it
      > represents that point where any more cars/wagons cannot be pulled by that
      > particular loco. In any case, it would be the same point for a given loco
      > every time.
      > Comments please? A better way? Are we on a fool's path?
      > Bill Kronenberger
      > Houston, Texas
      > > CraZy 'bout Zee!
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