How to get 2 TMCC (Atlas) diesels running at the same speed?

You may be able to set the number of steps depending on how the TMCC is controlled. If its an ERR or other system you may be able to set steps. If it's a Lionel system there are no adjustments.

ERR and TAS both have programmable step counts, though that may or may not help.

 

Are you running these with a CAB1 or Legacy system?  If you're using Legacy, try the TMCC control and not the CAB1 emulation.

 

First we need to know if these have TAS EOB units or Lionel Mother board and components.  I have seen both in Atlas.  Are the cruise controlled or without cruise.  G

  If these are not cruise or EOB, you can try reprogramming and then set the stall.

 

Bill

If they are TMCC units only then, Momentum set with a Cab1 remote is the key. Page 9 of the Complete Guide to Command Control.   Assumes that all units are well oiled and operating the same.   Set all Momentums the same then create your consist.  See how it works.

Eng ##  L, M, or H under the panel at the bottom of a Cab1, Set. 

  

I only have a Legacy remote/base.   I'm already doing TMCC control.   I'll play around with the momentum settings and see if they are the same.

Some more information.  Atlas F2/F3 offerings.
Oct 20, 2011, ERR drive
Sept 4, 2009, EOB drive
April 4, 2008, EOB drive Included Santa Fe.
Dec 29, 2006, EOB drive  (new model)

Santa Fe offerings were 2008

EOB speed control can be turned off, 32, or 128 speed steps.

With the Cab1 remote set each F unit. 

 
32 speed step mode.
ENG + ## + DIR + AUX1 + AUX1 + AUX1 + 1
(A horn/whistle will sound after the 3rd AUX1 and after 1.)

128 speed step mode.
ENG + ## + DIR + AUX1 + AUX1 + AUX1 + 2
(A horn/whistle will sound after the 3rd AUX1 and after 2.)

Cruise OFF mode.
ENG + ## + DIR + AUX1 + AUX1 + AUX1 + 3
(A horn/whistle will sound after the 3rd AUX1 and after 3.)

 

Your F2's are EOB drive system.  You may want to set each to the same setting and try them again. 

 

Sorry, I don't have a Legacy set.  Someone else would have to help you with the Legacy handheld in TMCC mode.

 Mike CT

I have 2 Atlas diesels that I run in 128 speed step mode and the momentum settings (L, M and H) have no effect on locomotive response. I think those settings only work in 32 speed step mode just like the squealing brakes.

Finally got these 2 diesels to behave.   Jerkiness is gone and running at the same speed!   Thanks guys!

How did you do it?

 

So, what did you do to even things out?

I have a similar problem with a Linoel Dash 8 that I upgraded with an ERR Cruise Comannder. I am try to run it with an off the shelf Lionel Dash 8 that came with TMCC.

I too am having a hard time matching speeds. What was your fix?

Reset both to 128 speed step mode.

 

Set Pre-Pulse to 1

Set Background Pulse to 5

 

 

What is pre-pulse and background pulse and how do you set them?

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Lionel BNSF Dash-9 Locomotive #1010 CMD 6 18253 this is the unit I am
trying to run with the err unit

On Monday, April 14, 2014, O Gauge Railroading On Line Forum
wrote:

I think the factory default for background pulse is 20, so 5 is a pretty low setting.

 

Here is how you set background pulse:

 

ENG + ## + DIR + AUX1 + AUX1 + AUX1 + 4 + # (The horn will sound after the 3rd AUX1. The coupler sounds after the 4 and then the horn sounds again after the #)

 

## is the pre-programmed engine ID.

# is the background pulse setting (1-20)

 

The pre-pulse and background pulse affect how quickly the EOB sends power to the motor.

 

   The 6-18253 uses a DCDR motor driver, this engine don't have cruise or odyssey 1. If you build a train and use the nudge feature you might get them in sync. It probably would a good idea to upgrade the 6-18253 engine to cruise using the Cruise Commander "M". What is the engine product number with the Cruise.

 

Bill

I found this tidbit somewhere via google and it helped a lot:

 

For the Pre-Pulse (affects the low end starting voltage)

ENG + ## + DIR + AUX1 + AUX1 + AUX1 + 5 + # (# can be any number 1 thru 8) (The horn will sound after the 3rd AUX1, a coupler sound after 5, a horn after #.)

The scale is linear, meaning 1 is the lowest setting and 8 is the highest setting. The lower the last digit is the slower the first speed step will be.

For the Background Pulse (affects the top voltage)

ENG + ## + DIR + AUX1 + AUX1 + AUX1 + 4 + # (# can be any number 1 thru 8) (The horn will sound after the 3rd AUX1, a coupler sound after 4, a horn after #.)

The scale is linear, meaning 1 is the lowest setting, 8 is the highest setting. The last digit is used to smooth out the slow end performance and eliminate any jerking.

NOTE: For locomotives that exhibit a slight jerkiness at low speeds or for locomotives with up to 4 motors such as an F-3 AA set with 2 powered A units that exhibit a low speed jerk the solution is in the background pulses. The Pre-Pulse should always be set to “1”. The Background Pulse can be moved up to “5” without affecting the low end. The Background Pulse will smooth out any jerkiness seen at the first speed step.