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Tsunami2 Digital Sound Decoder. Diesel Manual - part 5

Basic Programming

Tsunami2 Diesel User’s Guide

Table C. CV 29 Reference

Address Type

Speed Table Analog Mode Speed Steps Direction CV Value

Primary

“Short” (CV1)

Normal

Primary “Short” (CV1)

Reversed

Primary “Short” (CV1)

28/128

Normal

Primary “Short” (CV1)

28/128

Reversed

Primary “Short” (CV1)

Yes

Normal

Primary “Short” (CV1)

Yes

Reversed

Primary “Short” (CV1)

Yes

28/128

Normal

Primary “Short” (CV1)

Yes

28/128

Reversed

Primary “Short” (CV1)

Yes

Normal

Primary “Short” (CV1)

Yes

Reversed

Primary “Short” (CV1)

Yes

28/128

Normal

Primary “Short” (CV1)

Yes

28/128

Reversed

Primary “Short” (CV1)

Yes

Normal

Primary “Short” (CV1)

Yes

Reversed

Primary “Short” (CV1)

Yes

28/128

Normal

Primary “Short” (CV1)

Yes

28/128

Reversed

Extended

“Long” (CV 17:18)

Normal

Extended

“Long” (CV 17:18)

Reversed

Extended

“Long” (CV 17:18)

28/128

Normal

Extended

“Long” (CV 17:18)

28/128

Reversed

Extended

“Long” (CV 17:18)

Yes

Normal

Extended

“Long” (CV 17:18)

Yes

Reversed

Extended

“Long” (CV 17:18)

Yes

28/128

Normal

Extended

“Long” (CV 17:18)

Yes

28/128

Reversed

Extended

“Long” (CV 17:18)

Yes

Normal

Extended

“Long” (CV 17:18)

Yes

Reversed

Extended

“Long” (CV 17:18)

Yes

28/128

Normal

Extended

“Long” (CV 17:18)

Yes

28/128

Reversed

Extended

“Long” (CV 17:18)

Yes

Normal

Extended

“Long” (CV 17:18)

Yes

Reversed

Extended

“Long” (CV 17:18)

Yes

28/128

Normal

Extended

“Long” (CV 17:18)

Yes

28/128

Reversed

Note: Values in Table C are shown in decimal format. If your command station requires hex
inputs, you will need to convert. Refer to Appendix A for conversions.

Basic Programming

Tsunami2 Diesel User’s Guide

Configuring Throttle and Braking

You can use throttle and braking control CVs to customize
the decoder to your operating preferences. This section
details setting acceleration and deceleration rates,
automatically calibrating Dynamic Digital Exhaust (DDE) load
compensation, setting braking rates for the independent,
train, and dynamic brake functions, adjusting speed table
settings, and enabling motor trim scaling factors.

If this is overwhelming at first gla

nce, don’t worry! It’s not

necessary to change all of them if you don’t want to. We’ve
already talked about speed step selection in CV 29.

Setting the Start Voltage

Tsunami2 provides CV 2, Vstart, to set the starting voltage
that is applied to the motor at Speed Step 1, and is used to
compensate for inefficiencies in the locomotive’s motor and
driveline. CV 2 may be programmed with any value between 0 and 255 with each step in value
being about 0.5% of the maximum available motor voltage. To calculate the value of CV 2, you
can use the formula:

Desired Starting Voltage
CV 2 = 255 x

——————————————

Maximum Motor Voltage

If your DCC system supports Operations Mode Programming, an alternative method for setting
Vstart is to turn your throttle to the first speed step and then use the operations mode
programming feature to increase the value in CV 2 until the locomotive just begins to move.

Setting Momentum Rates

Tsunami2 provides two CVs to simulate the momentum due to train weight. CV 3 (Baseline
Acceleration Rate) controls how fast the locomotive responds to increases in throttle
settings. CV 4 (Baseline Deceleration Rate) controls how fast the locomotive will respond to
decreases in the throttle setting.

Both CVs can be programmed with any value from 0 to 255, with 255 corresponding to the
slowest acceleration or deceleration rate. Lower settings yield a more responsive locomotive,
which is useful for switching. When both CVs are set to 0, the locomotive will respond nearly
instantly to any throttle changes. A setting of 255, on the other hand, will require several
minutes for a locomotive to reach full speed from a standing stop. Setting acceleration and
deceleration rates can allow the speed of the locomotive to match the sound effects regulated
by Dynamic Digital Exhaust.

When using 14 or 28 speed-step mode, configuring acceleration and deceleration rates will
improve the decoder’s throttle response. This allows the locomotive to speed up and slow down
without lurching from one speed step to the next.

Throttle and Braking Control CVs
CV 2: Vstart
CV 3: Baseline Acceleration Rate
CV 4: Baseline Deceleration Rate
CV 5: Vhigh
CV 6: Vmid
CV 25: Speed Table Enable
CV 29: Configuration Data 1
CV 32: CV Index 2
CV 66: Forward Motor Trim
CVs 67-94: Custom Speed Table
CV 95: Reverse Motor Trim
CV 116: Dynamic Brake Rate
CV 117: Independent Brake Rate
CV 118: Train Brake Rate
CV 2.503: DDE Load Offset
CV 2.504: DDE Load Slope
CV 2.512: DDE Load Sensitivity

Basic Programming

Tsunami2 Diesel User’s Guide

Calibrating DDE Load Compensation

Tsunami2 features a cutting-edge new version of our already revolutionary Dynamic Digital
Exhaust! We highly recommend you automatically calibrate Dynamic Digital Exhaust settings
before adjusting throttle and braking control CVs. This will create an amazingly accurate
representation of prototypical operation. This will allow the decoder to produce more prototypical
prime mover responses when encountering changes in both grade and number of cars, during
operation.

To adjust all DDE settings provided by Tsunami2, refer to “Configuring Dynamic

Digital Exhaust.”

Follow the steps below to automatically calibrate DDE load compensation:

1. Ensure CV 31 (CV Index 1) is set to a value of 16 (default).

2. Ensure CV 114 (Engine Exhaust Control) is set to a value of 47 (default).

3. Enter a value of 2 into CV 32 to select Indexed CV Page 2. This allows you to adjust

DDE control CVs by accessing CVs 2.503-2.512 from your command station.

4. Set CV 512 (DDE Load Sensitivity) to a value of 16.

5. We suggest running the locomotive at a moderate speed for a minute or two before

continuing. If there is any build-up of lubrication or oil in the motor, this will provide better
results during the calibration procedure.

6. Set the throttle to speed-step 1.

7. When your locomotive is on level track, enter a value of 255 into CV 503 (DDE Load

Offset) to automatically calibrate the nominal low-speed load level.

8. Increase the throttle to an appropriate moderate speed for your layout (generally

between speed-step 25 and speed-step 40).

9. When your locomotive is on level track, enter a value of 255 into CV 504 (DDE Load

Slope) to automatically calibrate the nominal high-speed load level.

Note: If, after the calibration is complete, you feel the need to increase or decrease the
sensitivity, you can do this with CV 2.512.

Setting Braking Rates

Although you can activate the independent brake, train brake,
and dynamic brake sound effects with function keys by default,
CV 116 (Dynamic Brake Rate), CV 117 (Independent Brake
Rate), and CV 118 (Train Brake Rate) allow you to use the
dynamic brake function (F4), independent brake and train brake
functions (F11) to reduce locomotive speed and simulate
actually applying brakes during operation. We recommend
setting CV 3 (Baseline Acceleration Rate) to a minimum value of
45 before setting braking rates to allow for smoother operation
when the brakes are applied and released.

The values of CVs 116, 117, and 118 are added to the value of CV 4 (Baseline Deceleration
Rate) and determine how quickly your locomotive decelerates when brakes are applied. Enter
values from 0 to 127 into CVs 116, 117, and 118 to set longer braking rates, and enter values
from 129 to 255 to set shorter braking rates. The dynamic brake, independent brake, and train
brake functions will not reduce locomotive speed when CVs 116, 117, and 118 are set to values
of 0 or 128.

Braking Rate CV Values

0 = CV 4 + 0 (Disabled)
1 = CV 4 + 1

↓

127 = CV 4 + 127
128 = CV 4 + 0 (Disabled)
129 = CV 4

– 1

↓

255 = CV 4

– 127

Basic Programming

Tsunami2 Diesel User’s Guide

Note: When consisting with active momentum and braking rates, ensure the values of CVs 3, 4,
116, 117, and 118 are the same for all units.

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/trainline charge function (F12 by default) must be turned off for the
independent brake rate to be activated with the independent/train brake function (F11 by
default).

Set the Train Brake Rate

On a prototype locomotive, the train brake controls the brakes for each locomotive and car 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/trainline charge function (F12 by default) must be turned on for the train
brake rate to be activated with the independent/train brake function (F11 by default).

Set the Dynamic Brake Rate

Prototype diesel engines use the electric traction motors as generators for dynamic braking,
generally to save energy and diesel fuel, and reduce the wear on the braking systems used to
slow the train cars. CV 116 determines the deceleration rate that will occur when the dynamic
brake function is turned on. Enter a value from 0 to 255 into CV 116 to set the dynamic brake
rate:

Seconds/Speed Step = (CV 4 + CV 116) × 0.896 ÷ Number of Speed Steps

Although you adjust the braking rates in CVs 116, 117, and 118 the same way, the dynamic
brake function differs from the independent and train brake functions. For instance, the
independent and train brake functions will bring the locomotive to a stop, whereas the dynamic
brake function will not. You will hear the sound of the light dynamic brake without a change in
locomotive speed the first time you turn on the dynamic brake function. When the throttle setting
is above speed-step 8, pressing the function key again will produce the heavy dynamic brake
sound effect and reduce locomotive speed to speed-step 8 (while operating in 128 speed-step
mode) according to the rate in CV 116.

Follow the steps below when applying dynamic brakes:

1. Enter a non-zero value into CVs 3 and 4 to set acceleration and deceleration rates.

2. Enter a non-zero value into CV 116 to set the dynamic brake rate.

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