44520Re: Locomotive current demands
- May 13, 2006Sorry if dredging up ancient history offends anyone ...
--- In firstname.lastname@example.org, Dec 31, 1999, 9:52 pm,
> Jeffrey and Bim:
> >Jeffrey: I suppose I'm not quite clear on what we're checking here
> There are two nightmares you can have with any model train in any scale:
> 1. Burn out the motor (with too high a voltage, or some types of
> 2. Have a dysfunctional mechanism that gives you frustrating
> overloads the motor until it burns out, or tears up the gears.late.
> The question at hand addresses the detection of # 2 before it is too
A goal to which I aspire most vigorously!
> > Bim: What do you use to measure current???expressed in
> Most folks know that a volt meter measures electrical pressure
> volts. In order to make that measurement one puts the meter inPARALLEL with
> the power pack, the rails or the loco.the power
> In order to measure current, one has to put a meter in SERIES with
> pack. Since the polarity of the power back can be reversed, a "zerocenter"
> meter is appropriate. That means a meter that at rest, will haveits pointer
> in the middle of the scale, and not off to the left side like mostmeters. A
> meter with 1amp-zero-1amp offers a usable reading, but can survive adead
> short across the rails. Remember, any current (including a short)will pass
> through the meter on the way to the rails in a series connection.Again, because
> Likewise, a "zero center" voltmeter is quite appropriate too.
> the power pack can reverse the polarity to the rails.together a
> If interest develops, any one of several of us on the list can put
> list of parts from common (cheap) resources that folks can buy anduse, with
> little or no electrical knowledge. A number of how-to books alreadyhave
> this information.What I would like to do is set up dual meters (Volts & Amps) for each
> But let's see if anyone agrees with the "normal" readings and the "test
> procedure" before we advance to that step.
> Who's next at the keyboard on this topic?
> Bill Kronenberger
of my power packs, or integrate the meters into a Z Bend Track control
connecter. Where would I get the information as to parts & assembly
for this project?
John L. Battey in Roanoke, TX
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