Have a Digitrax DH123D decoder in my Athearn AC4400 and also some other SD40's. I have a Digitrax system. When I run the loco's with this decoder I dont get any movement until about throttle position thirty on my control. Does anyone know which CV's I need to adjust to change my acceleration, etc.? This problem makes it impossible for me to marry these locos with any others. I cant find the answer on the Digitrax website. Thanks!
Well, I'm certainly not an expert on such things, but I looked at the instructions for the DH123D decoder on the Digitrax website and that refers you to the Digitrax decoder manual: http://www.digitrax.com/ftp/Decoder_Manual.pdf
If you scroll down to index item 6.3 it says that CV2 is what you need to be adjusting for V start.
Start with CV2, this is the start voltage CV. Use Ops Mode programming - select the loco on your throttle, and adjust to speed step 1 or 2. The Press the Prgram button until you see Po for ops mode. Turn the left knob to display CV002= and then turn the right knob to a value to try. Press ENter to program that value. Start with 5, if it doesn;t move, try 10, then 15, until it moves. Once it moves, try one value lower until you find the minimum at which it will creep along reliably.
--Randy
Modeling the Reading Railroad in the 1950's
Visit my web site at www.readingeastpenn.com for construction updates, DCC Info, and more.
Acceleration is CV3
Deceleration is CV4
First off I would do a reset. CV8=8. I have some new digitrax decoders do that.. take a lot to get going or on the first click the train takes off at warp speed. Now I do a reset first thing and then adjust the start mid and top end cv's as needed