Basic Programing
Tsunami2 Electric User’s Guide
24
Setting the Custom Speed Table
Tsunami2 offers a custom speed table with 28
adjustable speed points. The 28-point custom
speed table is disabled by default. However,
you can enable it with CV 25 (Speed Table
Enable) and CV 29 (Configuration Data 1), and
then adjust each speed point with CVs 67-94
(Custom Speed Table). This allows you to
speed-match one locomotive to another, set a
prototypical speed range, compensate for
design flaws in the driveline, or improve
switching operations by setting more speed
steps to lower speeds and fewer speed steps
to higher speeds.
CVs 67-94 correspond to speed points 1-28.
Table D shows default values for CVs 67-94,
which create a linear speed table when the
custom speed table is enabled. Enter values
from 0 to 255 into CVs 67-94 adjust each
speed point from 0% to 100% of the maximum
throttle setting.
The decoder interpolates between speed steps
for more refined throttle control when 28/128
speed-step mode is active. Each speed point
of the custom speed table corresponds to a
number of speed steps. In 14 speed-step
mode, each speed point is equivalent to 0.5
speed steps. In 28 speed-step mode, each
speed point is equivalent to one speed step. In
128 speed-step mode each speed point is
equivalent to 4.5 speed steps.
Note:
All 28 speed points of the custom speed table must be set when using 14, 28, or 128
speed-step mode to prevent an unpredictable response from the motor when accelerating and
decelerating.
Follow the steps below in reference to Table D to enable the 28-point custom speed table and
adjust each speed point with CVs 67-94:
1. Designate each speed point of the 28-point speed table as a percentage from 0% to
100% of the maximum speed.
2. Enter each speed point’s percentage into the equation below to determine values for
CVs 67-94:
CV Value = 255 × (% ÷ 100)
3. Enter CV values for speed points 1-28 into CVs 67-94 to configure the 28-point custom
speed table.
4. Set bit 4 (STE) of CV 29 to 1 to enable speed tables.
5. Enter a value of 16 into CV 25 to enable the 28-point custom speed table.
Table D. 28-Point Speed Table Settings
CV
Value
% of Throttle
67 9 4
68 18 7
69 27 11
70 36 14
71 45 18
72 55 22
73 64 25
74 73 29
75 82 32
76 91 36
77 100 39
78 109 43
79 118 46
80 127 50
81 137 54
82 146 57
83 155 61
84 164 64
85 173 67
86 182 71
87 191 75
88 200 78
89 209 82
90 219 86
91 228 89
92 237 93
93 246 96
94 255 100
