Hey Everyone
I got two locos i put NCE decoders in. In the forward direction the back lights come on, in the reverse direction the front lights come on.
I think changing CV 29 to or 6 fixes it.
The decoders are D13SR, and DASR.
Any help?
CASo
This also indicates that you have the decoder installed backwards and have the front light connected to the terminals that are supposed to be the rear light. You can change it with a CV, but the motor may also then run backwards and need to be rewired.
Check the instructions that come with the decoders again and make sure you don’t have them upside down, which is an easy mistake to make because it’s not explained very well which side is up by looking at the diagram, but the text should say whether it goes in with the components on the top or the bottom.
CV 29=3 will give you 28 speed steps and reverse operation.
David B
Sounds most like the motor control out of the decoder needs to be reversed.
Check and verify that the decoders are installed correctly. Does the engine move forward when the throttle says forward? If so than check that the lights are connected to the proper function outputs. Last thing to check is the CVs controlling each light function. Are they set for directional control? Are they set correctly?
jktrains
…and this can be easily corrected by setting CV29=3…that is what is it there for.
Im suprised you didnt give him a link to Tony’s trains…
David B
Setting CV29=3 will cause the loco the run in the opposite direction when using the short address. What happens when he wants to use a long address? According to the decoder manual CV29 should then be set to 39. Depending on how the decoder is programmed the system may set CV29 correctly or it may not. Rewiring guarantees avoiding this problem.
The proper fix is to reverse the motor leads. On a DASR it could be as easy as removing the wire caps from the decoder connection and swapping the wires. On the DA13SR it is a little more involved since these would be soldered connections. But it is still the proper fix.
Providing a link to Tony’s would be a waste of time [censored]!
IIRC, Caso is using short addresses. Atleast, from past posts thats what I have gathered.
David B
I use long address CV 29 to 39 then ok.
I was watching my daughter and fell asleep on the instruction page, haha.
Thanks
GUYS
Direction is correct now.
The lights are still backwards, is there any CV to fix the lights??
CASO
Caso,
I would take jktrains advice and reverse the decoder because it’s in backwards. If you do end up doing that, you’ll need to change CV29 back to it’s default then.
Tom
I’ve done this myself. When you installed the decoder, did you have the motor out of the chassis?
If you did, it’s a good bet it got rotated on re-assembly. The top of the motor is now on the bottom. Because of phasing of the armature, it will run backwards relative to the decoder instruction.
Rotate the motor half a turn and it’ll be back to normal again.
Its wired in backwards, i don’t want to rip it apart, epecially the DASR
I soldered the DASR in.
Any suggestions??
Unsolder and reverse the orange and gray motor leads. That will fix it.
Tom
There are CVs that can be programmed to fix the lights. The best fix still is to change the motos leads. Simply swap the 2 wires from where they are connected
What system are you using? Fixing the lights involve changing the function mapping and changing the CVs that make the lights directional. The ease in which this can me done will depend on the system you’re using.
jktrains
33=2
34=1
That’ll swap the lights.
David B
David I tried those CVS you suggested, no luck.
I have a DIGITRAX Chief system and a DT400, as well as a program track.
CASO
Caso,
AGAIN, the best solution is to bite the bullet and reverse the orange and gray wires on the DA13 and the connections from the motor on the DASR. Then reset the decoder. Do this on the programming track by setting CV30=2.
Any other solution is like trying the use a hammer to put a screw in. You can do it but it takes a lot of effort.
One last solution would be to try the following:
CV33=1
CV34=2
CV120=2
CV121=1
Unfortunately the DT400’s programming interface for a decoder does not give you plain english commands for programming. If you have the ability to connect the Chief to a computer and use DecoderPro all of your programming will be greatly simplified.
Good Luck, let us know the results
jktrains
This is odd my DT400 does give me plain english display for programming CV. While I do own Decoder Pro, all my CV programming are done with a DT400 throttle at the local club and with a Zephyr at home. I find both very easy to use. Decoder Pro is used only to populate a data base of my decoders setting.
Jack W.
You ‘own’ decoder pro? Last time I checked, it is a FREE download.
Why would you use your DT400 instead of Decoder pro to program your locos? That doesnt ring true to me.
David B
Sorry David my poor English showing here, I meant I have Decoder Pro installed on a Think Pad and own Loco Buffer ll.
I think it is faster to tweak a CV or two with my DT 400 then Decoder Pro. At the Club we only have a slow and old Pentium ll running Win98 . I don’t use speed table only CV2 CV5 and CV6 along with some momentum and only have two QSI sound engines to program.