Dan Griffin Posted February 22, 2021 Share Posted February 22, 2021 Afternoon. Question for those qualified in all things DCC. I can programme cv’s but am clueless as to which ones do what. I have a chip, Bachmann 36-553 i think, hard wire fitted to a circa 1995 Hornby battle of britain 501 Squadron, Works well running but judders alot when at slow speeds, and starting off. Can anyone advise of the CV’s to alter, and to what, to make it run smooth? I also have a Hornby 4f, also hard wire fitted. What cv’s do i alter to make it move off slower? Thanks in advance. Link to post Share on other sites More sharing options...
norman Posted February 22, 2021 Share Posted February 22, 2021 Best advice is to read the manual. Bachmann and Hornby provide you with the information you are looking for. Norman Link to post Share on other sites More sharing options...
RMweb Gold Oldddudders Posted February 22, 2021 RMweb Gold Share Posted February 22, 2021 7 minutes ago, Dan Griffin said: Afternoon. Question for those qualified in all things DCC. I can programme cv’s but am clueless as to which ones do what. I have a chip, Bachmann 36-553 i think, hard wire fitted to a circa 1995 Hornby battle of britain 501 Squadron, Works well running but judders alot when at slow speeds, and starting off. Can anyone advise of the CV’s to alter, and to what, to make it run smooth? I also have a Hornby 4f, also hard wire fitted. What cv’s do i alter to make it move off slower? Thanks in advance. CV3 governs acceleration, and CV4 deceleration. Put small figures in to start with, say 20 and 10 respectively. Trial and error from then on. If your system is able to do Programming On The Main, these things are a whole lot easier. 1 Link to post Share on other sites More sharing options...
norman Posted February 22, 2021 Share Posted February 22, 2021 User manual | http://www.Bachmann.co.uk/pdfs/3-function_decoder.pdf https://support.Hornby.com/hc/en-gb/article_attachments/360015928340/R8249-Locomotive-Decoder-Leaflet.pdf 1 Link to post Share on other sites More sharing options...
smokebox Posted February 22, 2021 Share Posted February 22, 2021 It's CVs 54 and 55 that need adjusting to eliminate jerky starting and stopping. CV 54 affects starting and CV55 that controls stopping. There used to be a chart with suggested values on the Bachmann site but it seems to have been taken down since their website was updated. 1 Link to post Share on other sites More sharing options...
Andymsa Posted February 22, 2021 Share Posted February 22, 2021 59 minutes ago, Oldddudders said: CV3 governs acceleration, and CV4 deceleration. Put small figures in to start with, say 20 and 10 respectively. Trial and error from then on. If your system is able to do Programming On The Main, these things are a whole lot easier. I would avoid POM unless you know what your doing Link to post Share on other sites More sharing options...
Crosland Posted February 22, 2021 Share Posted February 22, 2021 24 minutes ago, Andymsa said: I would avoid POM unless you know what your doing Why? You can't read back, which can be inconvenient, but you can only program one loco at a time. Are you confusing it with some "train set" systems that do service mode programming on the whole layout and can reprogram every loco? Link to post Share on other sites More sharing options...
dasatcopthorne Posted February 23, 2021 Share Posted February 23, 2021 23 hours ago, norman said: Best advice is to read the manual. Bachmann and Hornby provide you with the information you are looking for. Norman Perhaps he hasn't got the manual? Dave. Link to post Share on other sites More sharing options...
dasatcopthorne Posted February 23, 2021 Share Posted February 23, 2021 Before you change and CVs, don't forget to record the setting before the chance so that you can return to the original in case it all goes wrong. Dave Link to post Share on other sites More sharing options...
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