Basic Programing
Tsunami2 Electric User’s Guide
22
Set the Independent Brake Rate
The independent brakes on prototype locomotives are applied separately from the rest of the
train, generally during switching operations and to control slack between units. CV 117
determines the deceleration rate that will bring the locomotive to a stop when the independent
brake function is turned on. Turning off the independent brake function will release brakes and
allow the locomotive to accelerate back to the prior throttle setting. Enter a value from 0 to 255
into CV 117 to set the independent brake rate:
Seconds/Speed Step = (CV 4 + CV 117) × 0.896 ÷ Number of Speed Steps
Note: The brake select function (F12 by default) must be turned off for the independent brake
rate to be activated with the independent brake function.
Set the Train Brake Rate
On a prototype locomotive, the train brake controls the brakes for each unit in the train and is
the braking method most commonly used to reduce speed. CV 118 determines the deceleration
rate that will bring the locomotive to a stop when the train brake function is turned on. Turning
off the train brake function will release brakes, cycle the air compressor for 15 seconds, and
allow the locomotive to accelerate back to the prior throttle setting. Enter a value from 0 to 255
into CV 118 to set the train brake rate:
Seconds/Speed Step = (CV 4 + CV 118) × 0.896 ÷ Number of Speed Steps
Note: The brake select function (F12 by default) must be turned on for the train brake rate to be
activated with the train brake function
Example: Prototypical Braking
Tsunami2 has more ways to prototypically operate your model, and the independent and train
brake functions are a great example! The steps below will guide you through setting
recommended momentum and braking rates and using the dynamic brake, independent brake,
and train brake functions prototypically while you operate:
1. Enter a value of 45 into CV 3 to allow the locomotive to accelerate in sequence with the
exhaust chuff sound effects regulated by Dynamic Digital Exhaust.
2. Enter a value of 75 into CV 4 to set the deceleration rate that allows the locomotive to
coast to a stop without any of the brakes being applied.
3. Because independent brakes are most often applied when running only a locomotive,
you may want to set CV 117 to a value of 178 for a more rapid braking rate.
4. Because an entire train takes longer to bring to a stop than just a locomotive, you may
want to set CV 118 to a value of 100 for a more gradual braking rate.
5. When running a light locomotive or a consist of only locomotives, apply the independent
brake with the independent brake function (F11 by default). The brake select function
(F12 by default) must be turned off for the independent brake to be applied.
6. When running a complete train, apply the train brake with the train brake function (F11
by default). The brake select function must be turned on for the train brake to be applied.
Turning on the brake select function will cycle the air compressor to simulate charging
the train line.