My BLI GG-1 has a jerky slow motion, with my NCE PowerCab in speed 001 or 002. In 003 it becomes “normal”. What CV must I “touch” or “retouch?”. Thanks.
I Take it your GG-1 is rather new and this ‘jerkyness’ should dissapear after it is broken in.
David
Mmmmm… “GG-1 jerky.” Sounds tasty! [C=:-)]
Thanks you, David, but the model is from the firsts times of BLI, and has more than 3 hours of use. Always ran in the same way. I supposed that the problem is in a CV or a mix of CV´s. Apart of that, the engine, details, weight and sounds are wonderful. Thanks you. doc
Dave, I´m of Argentina. At this moment, I don´t know what is “tasty”, but at 001 and 002 speed steps, the wheels turns a little, (1/3 of a full revolution) stops, a little more, stops, a little more, stop, and so on…
Oh, sorry… If you’re not a naive English speaker, my joke wouln’t have worked to well. Here in the US (and Canada, I believe), when we dry meat (like beef) so that it’s very chewy and will keep for a long time, we call it “jerky.” I make my own beef jerky for camping trips. In fact, I had just made some beef jerky when I saw your post about GG-1 jerky. Made me think of beef jerky.
The humor is kind of lost with this explanation. Sorry about that.
manago, this is surely an issue with the decoder and the drive interface. What I mean by that is the decoder, a QSI, is from the first issue, and probably does not have Back Electro Motive Force. That means the decoder does a very poor job of controlling the motor at very low speeds.
First, we must assume for our purposes that the drive mechanism is not experiencing problems with plastic grit, poor or absent lubrication, and some other type of damage or mis-adjustment. Let us just deal with the decoder for now. Have you adjusted CV 2 so that the locomotive begins to crawl when you dial speed step 001? If not, do this right away…now!
Next, dial in the speed step and run the locomotive in both directions…forward and reverse alternately…do you see a repetition of the jerky pattern? If so, I believe that the greater likelihood is that the decoder is what is causing this…no BEMF. You may be able to get an upgrade chip from QSI Solutions…not sure about that. If the loco runs smoothly at speed step one in one direction but not the other, then you may very well have something causing a binding in the drive mechanism. It may be flashing on one of the gears, grit in a bearing surface, missing lubrication or contaminated lubrication, a motor and drive shaft or a bearing that is out of alignment…you name it.
Buena suerte.
certain first run GG1s had gear issues somewhat like you know who. They had to be returned for repair. I know of at least one that was replaced with a new loco from BLI
to you and Selector: The GG-1 came with 2 broken plastic gears. I emailed BLI, and they sent me the spare parts. I´ve changed it, lubricated the engine, and put on service. Maybe has a mechanic problem, but I can´t compare it with other GG-1 BLI. Has not Back-emf (legal problems with other firm, at that time). I think about CV 2, but I can´t find the their default value; anybody knows? Thanks, doc
You must set it for yourself. I expect that the default is somewhere near 38, but I am sure that varies with model and manufacturer, maybe even from decoder to decoder, depending on the engine’s overall weight, the drive, and the type of motor installed.
So, enter Ops Mode programming with that loco engaged on the throttle, select CV 2, enter a value of 20 to start with, exit programming, and dial in the first speed step for acceleration. If the model moves, re-do it with a value of 10, and so on until you can’t get it to move at speed step one. Once you find the “no go” setting, re-program one higher number into CV 2 at a time, checking each time to see if that value gets it to start to turn the wheels. At some point, at some value, and all of my locos are different, the motor will get sufficient voltage at speed step one to cause the loco to begin to advance, albeit slowly, down the tracks.
This is mainly because there is no back-emf. Adjust CV2 for the minimum running speed and you should be good to go. I believe the upgrade chip is available for the GG1 - this would add BEMF and allow better slow speed running. If you are really looking for it to crawl reliably, the upgrade chip would be the best option. If ‘mostly creep’ is good enough, bumping up CV2 so that speed step 1 gives enough power for it to run reliable will do.
–Randy
Thanks you, Selector, but nothing changed. At the QSI manual version 2.0 (in the Web), the CV 2 default is 32. I put 32, 100, 130, 2, 1, and nothing changed. Or is mechanical problem, or, as another fellow said, maybe the upgrade chip will solve the slow motion problem. I´ll ask Tonys Trains. Thanks everybody.
If nothing changed, it means that the decoder, whether defective or not, did not accept or receive the changes that you input. Something is definitely wrong here.