Subject:
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Re: DCC slowing?
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Newsgroups:
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lugnet.trains
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Date:
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Wed, 13 Aug 2003 16:58:52 GMT
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Viewed:
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1634 times
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Perhaps the speed of the two motors was mismatched for one reason
or another. This would cause the two motors to generate more
heat (because they're pushing or pulling against one another) and lead to
a possible overheating situation. I've read about this one engine
"fighting"
another on the various DCC email lists. There could be several reasons for
a speed mismatch.
Do you know what brand and model of decoders you were using?
Different decoders may move at different speeds with the same
speed setting. This could be because of special decoder features, like
"Back-EMF" or "silent drive" or whatever. Also, most (if not all)
decoders allow you to vary how the decoder responds to speed
settings. For example, you can program the decoder to only go
at 75% of max speed when a full throttle setting is given. If one
decoder was programmed this way and the other not, then that
would definitely be a problem.
To avoid this kind problem, DCC users often keep a seperate
written record of how each decoder is programmed. I only have
a few DCC motors now, so it is easy to keep track of, but I can
see how it would be a useful idea once I get more decoders installed.
Also, I know one guy out there has written a speed calibration program
that measures the speed of an engine around a loop under various loads
and automatically calibrates the decoder. This kind of program would be
a definite plus for consisting and other multiple decoder situations. I'll
have
to look into how this could be done with LDCC...
HTH,
Mark
"John C. Moore" <JCMoore1965@aol.com> wrote in message
news:HJJFBG.1t8x@lugnet.com...
> I have a question abuot DCC. I was first exposed to DCC at our last LUG • meeting
> where some of the motors had been modified. They were running 2 motors on • the
> track on different channels. Then we placed the two motors on the same • channel
> and placed them on my train (which requires 2 motors). The results were
> nice...for a while. It ran quite nicely for maybe 10 minutes, but then it
> started slowing in the corners...especially in two corners that were • diagonal of
> each other on the oval. It continued to go slower and slower until it • came to a
> stop in these corners and simply was acting like it had no power. Has • anyone
> else had this problem and what is the cause? Over heating?
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Message has 1 Reply:
 | | Re: DCC slowing?
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| Thanks for the reply, Mark. (...) Both motors had Digitrax DN121 decoders (...) I don't think the DN121 has this. (...) Both had the factory default speed tables. We ran both motors without loads (okay, 1 had a bumper on it) around the loop, and the (...) (21 years ago, 13-Aug-03, to lugnet.trains, lugnet.org.us.indylug)
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Message is in Reply To:
| | DCC slowing?
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| I have a question abuot DCC. I was first exposed to DCC at our last LUG meeting where some of the motors had been modified. They were running 2 motors on the track on different channels. Then we placed the two motors on the same channel and placed (...) (21 years ago, 13-Aug-03, to lugnet.trains)
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