wolfie1509 Posted September 7, 2013 Share Posted September 7, 2013 I bought a new hornby R8249 decoder from Hattons.The loco will only crawl, whichever loco I put the chip in. My locos are fine, work OK with another chip. Have I done something wrong or is this what they call in the trade, knackered? Link to comment Share on other sites More sharing options...
Fishmanoz Posted September 7, 2013 Share Posted September 7, 2013 I think you've called it right. Suggest you send it back for replacement. Link to comment Share on other sites More sharing options...
Blackbird Posted September 10, 2013 Share Posted September 10, 2013 Have you tried reading the CV settings on the decoder? The 'max speed' is adjustable. The info sheet with the decoder will give you the CV values. Link to comment Share on other sites More sharing options...
wolfie1509 Posted September 10, 2013 Author Share Posted September 10, 2013 R 8249 won't let you change the CV for min/max speed Link to comment Share on other sites More sharing options...
wolfie1509 Posted September 10, 2013 Author Share Posted September 10, 2013 I have the answer! I am using e-link and the Min/max speeds are all pre-programmed into the drop down list of horby locos, to be scale speeds for that loco. They are designed to be specific not only to the type of loco that is being modelled but also the nature of the motor in that specific version, eg 1975 Flying Scotsman model needs different power than a 2013 version to get the same scale speeds. When setting up the chip I had inadvertantly picked a loco from the list that was nothing like the model or version that I had. The chip works fine! Link to comment Share on other sites More sharing options...
Flashbang Posted September 11, 2013 Share Posted September 11, 2013 Blackbird said: Have you tried reading the CV settings on the decoder? The 'max speed' is adjustable. The info sheet with the decoder will give you the CV values. No it isn't adjustable! The Hornby R8249 only offers CVs in the following range.. 1,3,4,7,8,10,17,18 & 29. Start volts CV2, Mid volts CV6 and top volts CV5 are not adjustable. Pleased to read Wolfie1509 that you have resolved your problem and it was all down to the settings in the Railmaster/eLink. Link to comment Share on other sites More sharing options...
Fishmanoz Posted September 11, 2013 Share Posted September 11, 2013 Flashbang, incorrectly set up with RM, but the problem is then that the wrong settings have been written to the decoder and so it behaved the same no matter what loco it was put in. Wolfie will have fixed it by setting up the correct loco type in RM. Link to comment Share on other sites More sharing options...
Blackbird Posted September 12, 2013 Share Posted September 12, 2013 I haven't tried the R8249 decoder, listed as NMRA compliant? Apparently the CV speed setting can't be adjusted? Thanks for the advise, I won't be using this one! Link to comment Share on other sites More sharing options...
Fishmanoz Posted September 12, 2013 Share Posted September 12, 2013 Blackbird, leaflet for the 8249 says it is NMRA compliant and supported CVs are 1,3,4,7,8,10,17-18,29. That doesn't include min/max speed or speed curves. RM must do the shunting/cruising scale speed adjustments itself and not store in the decoder. Link to comment Share on other sites More sharing options...
poliss Posted September 12, 2013 Share Posted September 12, 2013 Very few CVs are classified as mandatory by the NMRA. None of the mandatory CVs relate to performance. See http://www.nmra.org/standards/DCC/standards_rps/RP-9.2.2%202007%20July.pdf Link to comment Share on other sites More sharing options...
Michael_A Posted September 12, 2013 Share Posted September 12, 2013 Fishmanoz said: Blackbird, leaflet for the 8249 says it is NMRA compliant and supported CVs are 1,3,4,7,8,10,17-18,29. That doesn't include min/max speed or speed curves. RM must do the shunting/cruising scale speed adjustments itself and not store in the decoder. Link to comment Share on other sites More sharing options...
Michael_A Posted September 12, 2013 Share Posted September 12, 2013 RailMaster limits the speed, effectively by just not increasing the speed above a certain point. When RailMaster is connected to an Elite you can bypass this by increasing the speed with the Elite control knob Link to comment Share on other sites More sharing options...
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