peter_brown Posted June 14, 2018 Share Posted June 14, 2018 Hi. I want to turn off the DC option on one of my locos which takes off at an alarming rate whenever there is a track short circuit antwhere on my layout. I understand why it happens and that CV29 can be changed to cancel the option of using the loco on vanilla DC. Can someone give me a "Heads Up" on what to change. please?The loco is a 4-4-0 Compund with a TTS chip. The value of CV29 is 038 and the string is 99 20 29 38 76.I think I nearly understand that one bit has to be changed but I don't want to break anything!Advice and assistance would be greatly appreciated. Link to comment Share on other sites More sharing options...
Howbi Posted June 14, 2018 Share Posted June 14, 2018 This calculator will explain all.......... http://www.2mm.org.uk/articles/cv29%20calculator.htmbasically you need to deduct 4 from your current value so leaving 34 which represents long addressing (32) and 128 speed steps (2) with normal direction (0).........HB Link to comment Share on other sites More sharing options...
peter_brown Posted June 14, 2018 Author Share Posted June 14, 2018 Many thanks howbiman - I shall try that over the weekend. Is it worth making this change to all my locos (40 odd)? So far I've not had any damaged but I nearly lost one today and the toys aren't cheap. Thanks also for the calculator link - not sute that I'll understand it but I'll give it a go. Thanks again. PB Link to comment Share on other sites More sharing options...
Howbi Posted June 14, 2018 Share Posted June 14, 2018 PB.........I have always turned off DC running on every decoder at the outset........safest way in my book to prevent any chance of DC runaway which has often been mentioned..........HB Link to comment Share on other sites More sharing options...
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