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Discussion Boards => HO => Topic started by: breezy8 on November 01, 2015, 04:56:55 PM

Title: jerkey 4-8-2
Post by: breezy8 on November 01, 2015, 04:56:55 PM
I just received a replacement (under warrentee) of a 4-8-2- Lt mountain. I added a soundtraxx "economi" sound decoder and it works great ( the decoder)...My question is:  on speed steps 1-2-3  the engine JERKS wildly...I have to get to speed step 4 and above for it to run smooth ( NO JERKING)..   HOW DO I CORRECT THIS..????...Thanks in advance....TONY
Title: Re: jerkey 4-8-2
Post by: Trainman203 on November 01, 2015, 05:08:27 PM

http://www.trainweb.org/gnw/BEMF%20Tuning.htm

https://m.youtube.com/watch?v=i9hFJuDMSbM
Title: Re: jerkey 4-8-2
Post by: Hunt on November 01, 2015, 05:32:31 PM
Whoa! The SoundTaxx Econami is a different decoder than the Tsunami  so be careful if using information written about using a Tsunami.

Click Here  (http://www.soundtraxx.com/manuals/Econami-Steam-Users-Guide.pdf) for PDF of the Econami Digital Sound Decoder, Steam User's Guide. The CV 211, Adjust Low-Speed Operation info is on page45.
Title: Re: jerkey 4-8-2
Post by: Trainman203 on November 01, 2015, 06:15:06 PM
It's all the same idea.  For some reason soundtraxx changed a bunch of cv numbers from tsunami  for no real reason that I can see.
Title: Re: jerkey 4-8-2
Post by: breezy8 on November 02, 2015, 02:21:16 PM
trainman 203.....I followed the link you sent to a "t"....now I don't have
ANY slow speed.....at speed step 1   it runs like speed step 4 or5...am I doing something wrong..????Thanks   reezy8
Title: Re: jerkey 4-8-2
Post by: Trainman203 on November 02, 2015, 06:14:51 PM
Read your econonami iinstructions/ users guide and find out how to reset your decoder to factory default.  It will be a certain cv with a specific setting. The guide should be on sountraxx's web site.  Then you are where you started and can begin again.

I know how to make an engine with a regular Tsunami decoder crawl like an ant.  All of my engines used to jerk, got tsunamis, and now they all crawl.   

What I need are the econonami equivalents of tsunami cv's 2,  3, 4, 116, 209, 210 , 211, and 212.  Those are the ones in a tsunami that are involved.  Why the econonami cv numbers for the same functions were changed, cannot imagine.
Title: Re: jerkey 4-8-2
Post by: Trainman203 on November 02, 2015, 06:38:57 PM
This engine "did" run smoothly before you installed the  econonami, right?  If it didn't this may be a losing battle before you start.  I have a light mountain and it is one of my best engines.

I looked at the econonami user's guide, page 59, and it appears that the econonami Cv's needed to get your engine smoothly are the same as the tsunami except for one. So here goes......

Reset your decoder to factory default as per page 14 of the econonami steam users guide.

Set cv 2 , 3, 4, 209 and 210 to 0.  Turn your throttle to step 1.  Increase 210 settings until the engine just barely starts  to move.  It will jerk a lot.  Then you hunt for the 209 setting that will smooth it out.  It WILL get smooth I guarantee unless there is a physical bind in the running gear somewhere.

You'll need to jump around the cv settings in multiples of 10 or more to get in the neighborhood.  Then you tweak closer.

This will take a while and some practice, be patient.  It took me a few tries to get better at it.  But the engine performance in the end is worth it, my friend.

The chuff will now be very wrong.  To fix it, you will reset cv 114.  If you got 209/210 right , a value around 150 while running at step 10 of 128 ought to be in the neighborhood of 4 chuffs per driver revolution.  Step 10 is a good switching speed.  Above that you can't count the chuffs very well anyway, and down  below 10 most of my engines appear close enough to 4 chuffs per turn.  If the chuff is too fast or slow at 150, tweak accordingly.

As you may see, all of this is basically a big balancing act.  Changing CV's 2, 209, and 210 affect each other and the chuff as well.

When you finally get all of that done, set the momentum CV's 3 and 4 to suit.

When it's perfect, write down all of these CV settings in a record book so if the engine needs a reset you can put them right back in.

I've done this to over 30 engines and they are smooth crawling ants.

Try it and let us know how it came out.
Title: Re: jerkey 4-8-2
Post by: breezy8 on November 03, 2015, 11:21:23 AM
Thanks trainman...I will give it a try and let you know....Thanks again....
Title: Re: jerkey 4-8-2
Post by: Trainman203 on November 03, 2015, 06:24:00 PM
I forgot to say one thing.  Do all of this programming " on the main". You can adjust the CV's while the engine is in motion, and see immediate results.  You can do it on a program track, but there is a both physical and mental disconnect going back and forth.

If all of this doesn't work for you I won't know what to say.  It's worked for me, on tsunami decoders, more than 30 times.  I've fixed most of them on the Mississippi Gulf Coast.
Title: Re: jerkey 4-8-2
Post by: breezy8 on November 04, 2015, 10:28:47 AM
trainman 203.... Just one question before I start.  As I read the instructions you sent, after I set CV 2,3,4,209 & 210 to ZERO....I adjust all the other cv's as stated BUT do nothing to CV 2?   does cv 210 do this???  Thanks again...breezy8
Title: Re: jerkey 4-8-2
Post by: Trainman203 on November 04, 2015, 06:01:29 PM
Cv2 is different from 210, it is the motor starting voltage.  Make it  "0" to start and leave it there while you fool with 209 and 210.  It can be moved up if the engine is still stiff.

Take your time with this and don't get frustrated if it doesn't come out great right away.  It eventually will.  Practice is needed.  The second engine you do will be easy. I can do it in my sleep now.   This is a big balancing act, remember? When it is finally right you won't believe it how slow and smooth that engine will be.  My light mountain is the slowest and smoothest engine in town.

And don't forget you can always return to factory default.  There's no permanent ruination in any of this. 
Title: Re: jerkey 4-8-2
Post by: Trainman203 on November 04, 2015, 08:52:40 PM
Breezy, I have a tsunami in my light 4-8-2.  My setting for cv 209 is 100 and cv 210 is 4.  And cv 116 is 100.  I don't know how similar the econonami is to the tsunami , but you might try those first to,see if they put you in the ball park.  If they don't work, search as advised before.
Title: Re: jerkey 4-8-2
Post by: breezy8 on November 05, 2015, 10:57:12 AM
Thanks again trainman 203. I will give it a try today.......breezy8
Title: Re: jerkey 4-8-2
Post by: Bill Baker on November 09, 2015, 07:03:44 PM
And the answer is???????
Title: Re: jerkey 4-8-2
Post by: breezy8 on November 09, 2015, 07:25:13 PM
Bill, It works just fine now. Followed the suggestions and did some tweeking on my own  Although CV 116 does not apply to steam. 
Title: Re: jerkey 4-8-2
Post by: electrical whiz kid on November 10, 2015, 09:15:46 AM
Hunt; You commented that the 'Econami' is different than the 'Tsunami".  What would be those differences?

Rich c.
Title: Re: jerkey 4-8-2
Post by: Hunt on November 10, 2015, 10:17:10 AM
Quote from: electrical whiz kid on November 10, 2015, 09:15:46 AM
Hunt; You commented that the 'Econami' is different than the 'Tsunami".  What would be those differences?

Rich c.
Just a few things -
CV assignment
Advanced motor control
Assigning any function to any function key
Econami does not require a programming track booster
Title: Re: jerkey 4-8-2
Post by: Hunt on November 10, 2015, 10:22:43 AM
Quote from: jbrock27 on November 10, 2015, 09:28:05 AM
Econami is a stripped down, lesser frills version.

IncorrectEconami is not a stripped down, lesser frills version.

Title: Re: jerkey 4-8-2
Post by: jbrock27 on November 10, 2015, 10:31:34 AM
Really??

Then what is behind the name then?

Then I must stand corrected and apologize for providing misinformation :-[
Title: Re: jerkey 4-8-2
Post by: Trainman203 on November 10, 2015, 04:58:55 PM
Breezy, the econami chuff cv is 114, thought I'd given that.  Start trying values around 150 and tweak.
Title: Re: jerkey 4-8-2
Post by: breezy8 on November 11, 2015, 12:28:06 PM
   Trainman203  done that, seems to be working great. Now I'm trying to figure out what size resistor to use on an LED headlight. I bored out the back of the headlight and a 3mm LED fits great...Tried a 1k resistor, seems to be too bright, going shopping for some larger # resistors. Thanks for all your help....breezy8
Title: Re: jerkey 4-8-2
Post by: Trainman203 on November 11, 2015, 01:04:49 PM
Do the cv treatment to,all your engines.  The factory settings are never correct.
Title: Re: jerkey 4-8-2
Post by: breezy8 on November 13, 2015, 02:37:15 PM
trainman203...  My 4-8-2 is running great.  Now I have just one more question.....Will these settings work on DIESEL loco's too.....I have a GP9 w/ a tsunami th1000 & sound that I am having trouble with....trying these CV's...It won't start moving until I get to speed step 3.....cv 209=240, cv210=200....any ideas???THANKS AGAIN   breezy8
Title: Re: jerkey 4-8-2
Post by: rogertra on November 13, 2015, 02:42:55 PM
Quote from: breezy8 on November 13, 2015, 02:37:15 PM
trainman203...  My 4-8-2 is running great.  Now I have just one more question.....Will these settings work on DIESEL loco's too.....I have a GP9 w/ a tsunami th1000 & sound that I am having trouble with....trying these CV's...It won't start moving until I get to speed step 3.....cv 209=240, cv210=200....any ideas???THANKS AGAIN   breezy8

Download and instal JMRI, or at least look into it.  Makes programming dead easy, you don't even have to know what CVs you are adjusting.  JMRI knows that for you.

Cheers

Roger T.
Title: Re: jerkey 4-8-2
Post by: Trainman203 on November 13, 2015, 03:54:34 PM
I have a couple of atheann GP 9's that I did the same thing to. CV's 2, 209, 210 and 212 ought to be the same.  I'm not a diesel guy, I never run those geeps, but I think 116 is the "prime mover" and might need adjustment.  Someone else will have to help you with that one.
Title: Re: jerkey 4-8-2
Post by: electrical whiz kid on November 16, 2015, 08:44:05 PM
Breezy;
I have monkeyed around with different resistors and have found that a 1/4 watt resistor at about 6-700 Ohms is ideal-for me. 
I also use that 'golden' LED.  It gives a nice "steam locomotive" light.  The tenders I use just a white clear LED with a resistor rated at around 4-500 Ohms; which for some reason, looks nice.  Again, this is all subjective stuff.  My CVs are done per the book.
Rich C.
Title: Re: jerkey 4-8-2
Post by: jbrock27 on November 20, 2015, 07:18:30 AM
Question: much difference (in other words, enough to tell) between a 1/4 Watt and 1/2 Watt resistor?
Title: Re: jerkey 4-8-2
Post by: Len on November 20, 2015, 09:33:08 AM
Quote from: jbrock27 on November 20, 2015, 07:18:30 AM
Question: much difference (in other words, enough to tell) between a 1/4 Watt and 1/2 Watt resistor?

Physically at 1/2W resistor is about half again as big as a 1/4W resistor. Typical dimensions of the resistor body are:

1/2W - 9.5mm (+/- 0.2mm) long, 3.3mm diameter

1/4W - 6.5mm (+/- 0.2mm) long, 2.2mm diameter

Len
Title: Re: jerkey 4-8-2
Post by: jbrock27 on November 20, 2015, 01:31:30 PM
Ahh, that would explain a couple of things Len.  Thank you.  Only ever used 1/2 W so far. 
Electrically speaking, little to no difference?
Title: Re: jerkey 4-8-2
Post by: Len on November 20, 2015, 10:32:44 PM
A 1/2W resistor can handle roughly twice the power of a 1/4W resister. Other than that, for model railroading purposes, there's no difference electrically.

Len
Title: Re: jerkey 4-8-2
Post by: jbrock27 on November 21, 2015, 08:04:19 AM
Thank you again Len.
Title: Re: jerkey 4-8-2
Post by: electrical whiz kid on November 21, 2015, 08:16:11 AM
Jim;
Keep in mind that that LED doesn't represent any load as such.  The only consideration you should have is the size of the resistor.  Most here, I think, use 1/4 watt; they adapt easily to whatever 'requirements' modellers would have.  I usually 'shrink-tube' the whole assemblage; resistor, conductor.  Have had no problems thus far.
Rich C.
Title: Re: jerkey 4-8-2
Post by: jbrock27 on November 21, 2015, 08:47:03 AM
Quote from: electrical whiz kid on November 21, 2015, 08:16:11 AM
LED doesn't represent any load as such.  The only consideration you should have is the size of the resistor. I usually 'shrink-tube' the whole assemblage; resistor, conductor. 
Rich C.

Yes I am aware of the small amount of load and I do the same with the shrink tube (btw, looked in HD last night for shrink tape, did not find any or kapton tape I was looking for).  Until now, I have only ever bought 1/2 W ones, at Radio Shack bc that is what they had in the resistances I was looking for and the store was close by.  Never crossed my mind that there was a size difference; not like you would think of Watt as a measure of size like MM, as opposed to it representing power or energy.  I have found 1/2 W ones to be a little too big in some applications that I have used them in then had to work around that, so yes, 1/4 W would be better and I can probably find them cheaper on Ebay.  So I am glad I asked the question and got the answers.