722Re: Locomotive current demands
- Dec 31, 1999Answering 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???
> 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
> Bill Kronenberger
> -=-=-=-=-=-=-=- 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
> 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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