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Offline Danlake  
#1 Posted : 07 June 2013 07:34:35(UTC)
Danlake

New Zealand   
Joined: 03/08/2011(UTC)
Posts: 1,571
I just stumbled across the website forum:

http://kitforums.com/viewtopic.php?f=20&t=8369

There is a good post here regarding basic electricity and wiring on model layouts.

I was unaware that the old open frame motor used much more current draw than the new type can motors.

Brgds - Lasse
Digital 11m2 layout / C (M&K) tracks / Era IV / CS3 60226 / Train Controller Gold 9 with 4D sound. Mainly Danish and German Locomotives.
thanks 1 user liked this useful post by Danlake
Offline H0  
#2 Posted : 07 June 2013 08:48:39(UTC)
H0


Joined: 16/02/2004(UTC)
Posts: 15,254
Location: DE-NW
Hi!

He writes "Theoretically stranded wire will carry more."
Not with DC, only with AC. With the typical MRR wires and frequencies we can neglect this effect.
For details, see here:
http://en.wikipedia.org/wiki/Skin_effect

He writes "A 9 volt snap tab battery can store about one half of one amp"
Batteries don't store amps, they store amp-hours. Draw 0.5 A and the battery will last 1 hour, draw 0.05 A and the battery lasts 10 hours.


Modern decoders are designed to supply 1 A to the motor. Some old motors require much more than that and could kill the decoder.
The Märklin standard motor draws much current when the collector is dirty (carbon dust in the gaps) and this can kill unprotected decoders (like the 6080).

Still a problem with the modern "high efficiency" DC Märklin motor, but most modern decoders have overload protection.
Regards
Tom
---
"In all of the gauges, we particularly emphasize a high level of quality, the best possible fidelity to the prototype, and absolute precision. You will see that in all of our products." (from Märklin New Items Brochure 2015, page 1) ROFLBTCUTS
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thanks 2 users liked this useful post by H0
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