Tsunami Won't Start Slowly

[OK LANDING]

I have a Tsunami TSU 1000 medium steam decoder installed in a brass D4g 4-6-0. I can't get it to start or stop slowly. It jumps to about 5 smph at speed step one, and comes to a full stop from about the same speed, in forward or reverse. I'm using Decoder Pro for programming, and the V-start is set to 0, as is the forward and reverse trim. I can't find anything in the Tsunami manual to address this. My system is Digitrax Chief. I even tried a different throttle, but no difference. This is my third Tsunami installation, but the first with this problem. What am I missing?

 

TIA, Errol

[retsignalmtr]

Set CV2 at 25. Set CV 6 at 125. Set CV 5 at 225. Then set CV3 at 31 and CV4 at 0 and see if that helps. If it does then adjust CV 2 up or down to get the loco to creep at speed step1.

[OK LANDING]

Presently, CV 2 is at 0, CV 29 at 2, CV 3 at 90 and CV 4 at 80. I won't be able to try new settings until tomorrow. The decoder was a replacement for a digitrax DH 121 decoder, and it ran fine. I checked the current draw at that time, (about 8 years ago), and it was in the .25 amp range, IIRC. Thank you for the fast response!

Errol

 

[jjjwar]

I have a couple of brass CNR locomotives that have a Tsunami decoder in them. I cannot remember where I found the following info on adjusting the Tsunami decoder for smooth low speed but I worked well for my J-4-e pacific and my N-5-d 2-8-0. The adjustments also made my CNR bullet nose mountain run very nice at low speed. I adjust mine by doing the following using OPS mode programming.

1-make sure you do not have any speed curves turned on ( CV29)

2-Set CV2 to 0

3-Set CV3 to 0

4-Set CV4 to 0

5-Set CV209 to 0

6-Set CV210 to 0

7-Exit programming mode and set the throttle to speed step 1.The locomotive will not move at all right now no matter what speed step tthe throttle is at. Make sure it is set for speed step 1 then go back into OPS mode programming.

8-Adjust CV210 so the locomotive just barely moves ( will be jerky ). For my locomotives I started at 1 and increased the setting by 1 until the locomotive just barely moved.

9-Adjust CV209 until the locomotive smooths out. Again I started at 1 and went up by 1 ( example 1, 2, 3.....). This will get you the lowest smoothest speed possible. Well at least for me it did. my J-4-e pacific creeps along really, really slow.

10-Once you have done the above you can now set the chuffs if you are not using a chuff cam using CV116. Set  the throttle to speed step 10 to 15 then using OPS mode programming adjust CV116 to get four chuffs per wheel revolution.

11-Now add some momentum using CV3 & CV4. I set CV3 to 40 and CV4 to 20 for my locomotives. This will allow the locomotive to slowly accelerate and to slow down nicely without coming to a sudden stop.

 

Wayne Reid

 

 

 

[OK LANDING]

Thanks, Wayne!

I now have a slow-moving Canadian Pacific D4g! The key was adjusting CV's 209 and 210. They are mentioned on page 57 in the manual under advanced programming step 9, "Setting up the hyperdrive". I would never have found this myself, not having a clue what a hyperdrive does, let alone a Kp coefficient, or a Ki coefficient.

Thanks again, you made my day!

Errol

[jjjwar]

I am glad you got it to run slowly. I went through the same problem with my brass CNR J-4-e until I ran accross the info on adjusting CV209 & CV210. Now once I have finished installing a Tsunami sound decoder in one of my steam locomotives those two CV numbers are the first ones I play with.

 

 Wayne Reid