Serge NOEL
105 lines
5.2 KiB
Plaintext
105 lines
5.2 KiB
Plaintext
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<title>JMRI: Speedometer - Speed Matching</title><!--#include virtual="/help/en/parts/Style.shtml" -->
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<h1>Speedometer</h1>
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<h2>Speed Matching</h2>
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<h3>Consisting Engines of Different Manufacturers Using DCC/DecoderPro</h3>
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(Provided by Keith Keith Albright of the Four County Society of Model Engineers)
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<p>In most cases, DCC has made it easy to consist engines that could not be run together in
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analog mode. The following are tips and procedures that I use to allow engines to run
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together. I make it a habit of setting up all of my freight engines to run at the same speed.
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I do likewise with my passenger engines. If you use the same type of engine for both, you
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might want to make them all the same speed.</p>
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<p>What Speed? - Which engine do you select as your constant. Three possible choices are:</p>
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<ol>
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<li>The slowest engine (top Speed)</li>
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<li>Your Favorite engine</li>
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<li>A sound equipped engine</li>
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</ol>
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All three can be used and each has advantages and disadvantages. The slowest engine has the
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advantage of guaranteeing that all other can be consisted. Specialized engines such as shays
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are usually ignored. If you are partial to a certain manufacturer (ex Stewart), you may want
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to make that your standard.
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<p>A word on engine motors and decoders. Engine motors can be divided into 2 categories; Open
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frame and can motors. Open frame motors tend to be faster and more subject to speed variation
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than Can motors. They draw more amperage than most can motors and are a little more difficult
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to get going at low speed steps. Although cheaper, with a little care and maintenance, they
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can give many hours of long service. They are commonly found on less expensive engines. Can
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motors tend to be much smoother in operation throughout their speed range. They have low
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current draw and little maintenance. They are found on newer and better quality engines.</p>
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<p>If you plan on consisting open frame and can motor engines together, I would recommend
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using TCS decoders for the open frame motors. Dither, a feature of TCS decoders, does a great
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job of overcoming the slow speed hang up of open frame motors. I would also select a can
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motored engine as your constant. Once you have decided on your constant engine, the following
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steps should allow you to run engines at the same speed.</p>
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<ol>
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<li>If the engine is new, it should be run in for an hour or two before setting the
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speed</li>
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<li>Warm up both engines and make sure their wheels are clean. 3-5 minutes usually
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suffices. This will also give you an idea on how close the speeds are for the 2
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engines.</li>
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<li>Make sure CV19 is set to 0 for both engines. Also, make sure your engine is not set for
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alternate speed steps. If you want to increase the starting voltage on your engine, do it
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before proceeding to step 4.</li>
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<li>Make sure the engine you want to match is in your decoder pro roster. Crank up decoder
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pro and use programming on the main. Call up the engine you wish to speed match from your
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roster.</li>
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<li>Make up a normal consist with your constant engine as the lead engine. Do not lash the
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engines together. 8-10 inches between them is a good start.</li>
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<li>If you are using a decoder with BEMF, it should be turned off for consisting.</li>
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<li>Select the speed table screen for the engine called up in decoder pro.</li>
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<li>Select user defined speed table on the screen</li>
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<li>Set step 1 of your speed to the starting voltage from the top of the page. Set step 28
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to 255</li>
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<li>Click on match ends on the speed table. Then write this to the loco.</li>
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<li>Run the locos. If you have made a good choice on your base engine, the following engine
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will probably be faster. Reduce the speed step 28 setting; Match ends and write to the
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engine. Some systems/decoders will allow you to do this on the fly, other will make you
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stop the engines. Repeat this procedure until the engines speed match. After you do a few
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you will be able to match an engine faster than you can read this procedure. We have found
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that this method gives us great speed control and is actually faster to do than using the
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Vmid and Vmax settings. It also eliminates fooling with forward and reverse trim if you
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decoder requires it.</li>
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<li>If your decoder does not support 28 speed step settings you will need to use the method
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outlined in the other clinic.</li>
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</ol>
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<p>Back to the <a href="index.shtml">Speedometer main Help page</a></p>
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