Elliot1982 Posted May 17, 2018 Share Posted May 17, 2018 Hi folksHeljan class 47 purcahsed, second hand. DCC TTS fitted by me. At slow speeds it judders, in particular one way. I've cleaned wheels and connectors to inner wheels.Any ideas?CV Related? Link to comment Share on other sites More sharing options...
Chrissaf Posted May 17, 2018 Share Posted May 17, 2018 Search the forum for " CV150 " there are many posts relating to this issue..Follow up the title search with search post content for CV150 for more info. Basically CV150 modifies the motor algorithm. Changing the default has been reported in posts to cure slow speed judder. Link to comment Share on other sites More sharing options...
jane1707819582 Posted May 18, 2018 Share Posted May 18, 2018 change c.v 150 to one then reduce/increase cv 153 and 154 to get the smooth running you desire if you like you can leave cv 150 at 0 and alter cv 151 and 152 ,these by default are set at 8 ,so not a great deal to play withaltering cv 10 back emf control can also assist ,turn it off to see if this assists Link to comment Share on other sites More sharing options...
RDS Posted May 18, 2018 Share Posted May 18, 2018 Why does it run unevenly (particularly) in one direction though? Surely the CV's will affect both directions. Link to comment Share on other sites More sharing options...
Elliot1982 Posted May 18, 2018 Author Share Posted May 18, 2018 I've since decided to sell the train as I've been told the TTS can't handle the heljan power / output Link to comment Share on other sites More sharing options...
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