I have two engines with QSI decoders and am a little puzzled in regard to the best setting for CV2. I use one of the predefined "speed curves" on CV25 (CV25 = 3) and want a good balance between slow speed start and acceleration. The default for CV2 is 32. Presently, I have CV2 = 20. Any insights?
TRNJ
I have most or all of my (upgraded) QSI decoders set to a value next to or at "0" in CV2 because the next 10 values or so seem to get the engine underway even faster. It is like CV2 has no meaning in many decoders, except for perhaps the LokSound decoders.
I'll have to keep reading here and maybe learn something....probably about setting up BEMF properly or torque compensation...
-Crandell
With good quality BEMF, CV2 IS pretty much meaningless - good BEMF will start on speed step 1 or amybe 2 regardless of specific motor characteristics - you are commanding it to move and BEMF will increase power until it is moving. Take one of those upgraded QSI decoders and switch off the BEMF and try speed step 1 - probably won't move. Without the upgrade chip, you don't get BEMF, so some setting in CV2 is needed to get thigns rolling at low speed steps. Best way to set it is to select speed step 1 and then program in Ops Mode gradually larger values in CV2 untilt he loco can run reliably, maybe back it off 1 or 2 from the minimal smooth runnign value.
--Randy
Modeling the Reading Railroad in the 1950's
Visit my web site at www.readingeastpenn.com for construction updates, DCC Info, and more.
In order for CV2 to do anything in a QSI decoder unless you deactivate RTC. RTC is on by default. BEMF is not enabled until RTC is disabled. I have found that RTC makes my QSI locos smoother running and better slow speed than BEMF and CV2 through 6.
Pete
I pray every day I break even, Cause I can really use the money!
I started with nothing and still have most of it left!