dude2112 Posted April 2, 2013 Share Posted April 2, 2013 Good evening too all, I am currently changing all my locos too DCC, I have put an eight pin decoder in my Princess class loco and it runs fine but requires twice the amount of power too get it too run than any of my other trains, even without carriages before you ask... Does anybody else have this issue ? Link to comment Share on other sites More sharing options...
Fishmanoz Posted April 2, 2013 Share Posted April 2, 2013 What do you mean by twice the power? Are you doing a current test or do you mean that you have to turn the controller up to a higher speed step before it moves? Link to comment Share on other sites More sharing options...
Gregd99 Posted April 2, 2013 Share Posted April 2, 2013 does this assist? https://www.hornby.com/forums/hornby-forums/hornby-digital/4698/ Link to comment Share on other sites More sharing options...
morairamike Posted April 3, 2013 Share Posted April 3, 2013 When you run a loco on DCC the top voltage at the motor will be less than that on DC. DC voltage is a nominal 12V but most controllers put out 15 to 16V. On DCC, the motor voltage is PWM (pulse width modulated) which will when compared to DC be a nominal max 12V, so the motor will not run as fast. The decoders CVs need to be set. there are various changes you can make PROVIDED your controller will do this some wont. CV1 is the address which you will already know about, each loco needs its own CV2 is V start (start voltage). In a perfect world all your motors would start at 1 on your controller but they don't, for various reasons. a) motor type b) friction in the drive train. c) weight of the loco. d) lack of lube. Change CV2 by increasing it until the loco moves then you decrease it again until it just stops. Again increase until it just starts to move again. Store that number. Now on speed step 1 the loco should start to move. CV3 & 4 are momentum, these settings give a more realistic acceleration and deceleration rate as the speed is increased. When CV3 & 4 are 0 then no momentum is applied. CV5 is V high or top speed. Allows you to give realistic top speed to your locos, so that an 0-4-0 tank doesn't break Mallards speed record. CV6 is V-mid or the middle speed. Note this must be lower that V high. a setting of 60% would be quite realistic. Link to comment Share on other sites More sharing options...
dude2112 Posted April 3, 2013 Author Share Posted April 3, 2013 Yes Fish I mean higher number on my controller, and cheers mike I will try that tomoz when off shift.... Link to comment Share on other sites More sharing options...
Gregd99 Posted April 3, 2013 Share Posted April 3, 2013 did you have a look at the scale speed? CV2/5/6 are supported by the 8245. I think they are not supported by the 8249. Link to comment Share on other sites More sharing options...
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