I recently purchased a RSD-15 that had been slightly used but was in mint condition when I run it I is very slow even at speed step 126 which is full speed. I figure that the previous owner relegated it to yard work and reconfigured it as a switcher my clubs DCC guy tried solving it but no luck what would need to be changed in the decoder to pick up the speed some?
Steve
If everything seems under control, you're not going fast enough!
Have you tried resetting decoder to factory settings? Then power off & on to complete the reset. Then select as loco #3 and see. If ok, change address and other CVs as desired.
Paul
Modeling HO with a transition era UP bent
You could try setting CV 2,3,4,5 and 6 to zero and see what happens. Those CVs control speed settings and momentum. Changing them to zero should result in the engine running as fast as it can at 100% throttle (highest speed step) with no momentum. It could be one of the speed CVs (2-5-6) got set incorrectly, it can happen that a momentum CV (3-4) can be set way too high, so the engine takes minutes to get up to speed.
Maybe also read CVs 66 and 95, and see what happens if you increase them.
It has a ton of momentum on it (not an actual ton) and once it gets going it's still slow
Also I ran it on my clubs layout which is a continuous loop with no set operating rules I ran it at 126 for like 10 minutes and it never really got going
Top speed (CV5) may be set, or there may be a speed table configured. Factory reset is your best bet.
--Randy
Modeling the Reading Railroad in the 1950's
Visit my web site at www.readingeastpenn.com for construction updates, DCC Info, and more.
You really need to do two things, as has already been suggested:
Do a factory reset (CV-8 set to "08", power off the rails, then restore power).
Acquire address "03" on your throttle and make it active. See if the newly reset decoder obeys your instructions via your paddle. If it does, you'll find the speed greatly increased.
I suspect someone fiddled with the value in CV-5 and made it about the same, or less than, CV-6, the middle voltage rande.