RockabillyShaun

Hello there, was wondering if any of you happen to have or know of a place that might have a generic list of CV values for Digitrax? Something like

Proto 2000 SD7 uses the following values..... etc.. 

Atlas C30-7 uses these following values.... etc.. 

 

I'm trying to get the best CV2, CV5 & CV6 for my locomotives. I know there's a "standard" for road engines and a standard for switches but I can't seem to find that list.. 

Thank you!! 

 

Shaun Toman's Union Pacific HO Scale Oregon Division 

https://www.flickr.com/photos/124768892@N06/sets/72157645286735675

IMG_1112.jpg 

Reply 0
barr_ceo

No, no "standard"...

There are far too many combination of decoder and locomotive for there to be "standard" settings... even on identical locomotives, differences in tolerances in the drive train can make things very different.

Your best bet for a reference sheet, however, might be to download the JMRI program and see what CVs it references. It's the closest thing to having all that information on different decoders in one place you're likely to find, and it's free.

Read my Journal / Blog...

!BARR_LO.GIF Freelanced N scale Class I   Digitrax & JMRI

 NRail  T-Trak Standards  T-Trak Wiki    My T-Trak Wiki Pages

Reply 0
Joe Brugger

Maybe

If you can give an idea of how you're using these engines and what you want to achieve, someone can help. The beauty of DCC decoders is the wide range of programming available.

Reply 0
Nelsonb111563

No "real" shortcuts

When it comes to programming locos, there are no real shortcuts to get good performance even from the same brand and model of locomotive.  CV 2 is your start voltage setting and 5 is your top voltage setting with CV 6 the mid point of your speed curve.  What I find works is to set up 1 locomotive that you will use for road power and then match all the others to it.  It will take a bit of time but will be worth it.  

P.S. I set a top speed limit of about 40 to 45 scale MPH for ALL my locomotives at speed step 28. ( DCC decoders only have 28 actual speed step CVs)  Use 128 speed steps if you can.  28 will do fine and avoid 14 speed steps.

Nelson Beaudry,  Principle/CEO

Kennebec, Penobscot and Northern RR Co.

Reply 0
RockabillyShaun

Atlas Master SD24's

So here's the CV's I have set on my 2 Atlas SD24's:

One of them still runs faster then the other.. (#400 is the lead loco and its running slower then #401) Trying to get them matched up has been very difficult. They both have the same decoder.

LocomotiveAddress CV02 (Start)CV05 (High) CV06(mid)CV29 CV03 CV04(Momentium)
UP #401 SD2440 3 75 90 3 5 5 
            5 5 
UP #400 SD2440 2 90 130 3     

 

 

Shaun Toman's Union Pacific HO Scale Oregon Division 

https://www.flickr.com/photos/124768892@N06/sets/72157645286735675

IMG_1112.jpg 

Reply 0
RandallG

Shaun, There was a DCC

Shaun,

There was a DCC shortcuts Card that was released as a bonus download in issue 4 of MRH. It may contain some useful information. 

Randy

Reply 0
RockabillyShaun

Oh that would be great!

I'll have to check that out! 

 

Shaun Toman's Union Pacific HO Scale Oregon Division 

https://www.flickr.com/photos/124768892@N06/sets/72157645286735675

IMG_1112.jpg 

Reply 0
Nelsonb111563

1st issue I see

is that both locomotives are set for the same address.  This alone will make speed matching difficult.  I would set one locomotive at address 40 and the second one at address 41.  Seeing as how the 401 is the faster of the two, for speed matching purposes, it should become the lead locomotive.  By having them on different addresses, you can start off the 401 and then set your start CV2 on 400 to match the start speed of 401.  A loop of track or a long run helps in this procedure.

P.S. what DCC system is being used? and are you doing this in 28 speed step mode.  Another question is "how much faster is 400 VS 401 and at what speed step?  I cansee by the CV5 value you have set for 400 at 75 VS 401 at 90 tells me that there is a possible issue with the drive line possibly binding or something.  If you have the DC jumper plug, I would remove the decoder and re-install the DC jumper and test them both on dc to see if the problem is in the locomotive or not.  No magic here, just set them both on the same track with a DC powerpack and turn up the power until they both move.  If both move at about the same time and run at about the same speed on DC, then the problem may lie with the decoder.  I would reset both decoders to factory default (CV8=8 on program track)

This will allow a fresh start for determining the issue. 

Nelson Beaudry,  Principle/CEO

Kennebec, Penobscot and Northern RR Co.

Reply 0
Joe Brugger

Shortcuts card

I was going to upload the shortcuts card PDF but it's 1139K.  Does anyone have a link?

Reply 0
turnbub

CV's for Mantua 2-6-6-2 loco

Does anyone have the CV's for a Mantua 2-6-6-2 Articulated.

It's an older loco which my brother -in-law gave me; he could not find the manual.

Of course both Mantua and Tyco have stopped producing,

and we could not find a website which might provide support.

Reply 0
Prof_Klyzlr

Mantua 2-6-6-2 DCC = Not a OEM...

Dear Turn,

AFAIK, the Mantua mallet wasn't ever offered "ex factory" with DCC installed,
so simply saying "Mantua 2-6-6-2" doesn't help identify the decoder make/model :-(
(IE it's most likely an aftermarket DCC-decoder retrofit).

Best advice,

- Do a CV Read of CV7 (Manuf Vers) and CV8 (Manuf ID),

- Compare the values against the "DCC Shortcuts" card
http://mrhpub.com/2018-02-feb/download/BONUS-DCC-Shortcuts-Card-v1.2.pdf

then with some idea of the specific decoder in-question,
you/we should be able to work out:
- what specific behaviour/feature/setting you want to change
- and which CV relates to that change you wish to make...

Happy Modelling,
Aim to Improve,
Prof Klyzlr

Reply 0
Pennsy_Nut

Is this what you mean?

image(1).png I honestly would not start with 26 for CV2. More like 02 or 03. But that is where you start. And the above is from Digitrax's manual. But I tend to agree with most in that CV5 should be about half or 128 for freight. A little higher for passenger and a little lower for switchers.

Morgan Bilbo, DCS50, UR93, UT4D, SPROG IIv4, JMRI. PRR 1952.

Reply 0
marcfo68

. . .

He first needs to determine who the decoder is made by and then which version it is. The ref card mentioned will provide one, but not the other,

The listing Morgan provides is mainly  Digitrax decoder related.  Your decoder may not even support CV2, 5, 6 for all we know.

Give us the values of CV8 and CV7  and we can assist, that is if you have the hardware to permit reading CV's

Marc

Reply 0
Pennsy_Nut

Sorry!

Thanks Marc: When I read the opening request, I saw Digitrax. And yes, that is not what he meant - he meant on a Digitrax command station? So, he really needs the manuals that are for whatever decoders he has. Locos being Proto 2000 and Atlas. But what decoders are in them?  RockabillyShaun: We need more info in order to help you. Don't Proto 2000 have some place in their literature that came with the loco? Same for Atlas? Other than that, does someone have those locos and can help? To be more detailed, get info on the actual proto engine for top speed, etc. Then set CV2 for start voltage - 2 or 3 or such. And for CV5, as a start for top speed - use 128. And I would suggest 64 for CV6. those will give you a pretty good start. And as has been mentioned many times, get one loco running the way you want and just match the other so they run pretty close to each other. Whether you consist or not. This is just my suggestions and hope it helps. And no offense to anyone!

Morgan Bilbo, DCS50, UR93, UT4D, SPROG IIv4, JMRI. PRR 1952.

Reply 0
marcfo68

. . .

Quick look on Soundtraxx site show a Proto SD-7 was offered with Tsunami  and it does not support CV5 or CV6.

https://soundtraxx.com/content/Reference/Factory-Installed/Walthers/Diesel/walthers_ho_sd7_ble.pdf

Atlas I find nothing  re C30 -7. May have been DCC-Ready only

So the simplest is getting the CV7 and CV8 values as the decoder installed (if there is)  could be anything under the sun.

Marc

Reply 0
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