https://blog.model-train-help.com/2010/11/faulty-engine.html?utm_source=rss&utm_medium=rss&utm_campaign=faulty-engine Model railroads and model trains Tue, 20 Nov 2012 06:00:11 +0000 hourly 1 https://wordpress.org/?v=6.9.4 https://blog.model-train-help.com/2010/11/faulty-engine.html#comment-952 Tue, 14 Dec 2010 17:47:26 +0000 http://68.171.208.138/~blogmode/2010/11/faulty-engine.html#comment-952 Dear John, perhaps I’m not understanding your situation because if you have two or more loco power units, you will be pulling two or more times the current in parallel from the 12 V supply except that slightly more volts will be lost across the PSU’s own internal resistance owing to the higher current pull. You must have run two or more locos on the same non-DDC track – this is the same. Whether the PSU trips or not depends on its own limit’s setting and any heating. With more loco power units, the current is multiplied not divided. However, with a third unit, you will probably have a better power-weight ratio so will not have to the PSU control so high – probably. Some loss of “resistance matching” may mean power losses in the circuit but you can’t help this so give it a try.
Please tell me what I have not understood!

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