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Basic Programming

The exact throttle response for each curve is shown graphically. The logarithmic curve provides a rapid throttle response at low speeds, while the exponential curve provides a rapid throttle response at higher speeds.

In order for the speed table selection in CV 25 to take effect, bit 4 of CV 29 must be set to 1. Refer to the previous section “Configuring the Decoder” or the Technical Reference to determine the correct value for CV 29.

Set the User Loadable Speed Curve The User Loadable Speed Table allows you to create virtually any throttle response curve you can imagine. You will first need to design and program the Loadable Speed Table. The Loadable Speed Table consists of 28 data points contained in CVs 67 through 94, each defining the percentage of motor voltage applied at a given speed step. Each data point can contain a value of 0 to 255 corresponding to 0 to 100% of available motor voltage. Table C. Calcu User Loadable lating the Speed Table CV % Full CV# Speed Step Spee 4 7 11 14 18 22 25 39 32 36 39 43 46 50 54 57 61 64 67 71 75 78 82 86 89 93 96 d Value 9 18 27 36 45 55 64 73 82 91 100 109 118 127 137 146 155 164 173 182 191 200 209 219 228 237 246 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 In 28 speed-step mode, each data point directly corresponds to a speed step. In 128 speed-step mode, each data point corresponds to every four and a half speed steps. The motor voltage for intermediate steps is interpolated by Tsunami to produce a smooth curve. In 14 speed-step mode, alternate (odd numbered) data points correspond to speed steps 1-14. Important: all 28 data points must be programmed even for 14 speed-step mode or an unpredictable throttle response may occur while accelerating or braking. To create a speed curve, begin by assuming that Tsunami will be operated in 28-speed step mode. Don’t worry if you are using another mode - Tsunami will automatically take care of the translation between modes. Start by making a table containing 28 entries - one entry for each speed step. For each entry, record the desired throttle response as a percentage of full speed, i.e., 0 to 100%. 1. 2. 100 255

Tsunami Steam Sound User’s Guide

Page 19

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