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Advanced Programming

Strategy for CV Optimization Finding the right combination of CV settings requires a certain amount of experimentation and patience to get the best performance. Be aware that these settings will also vary from one locomotive to another. Take notes of your CV settings so you can use them as starting points when configuring other locomotives.

Overdoing a particular setting can actually degrade performance so changes should be made in small increments (+/- 10 or so) until the desired performance is attained. The default settings should provide satisfactory performance when used with most HO and N scale motors. We suggest the following procedure to help fine tune the CV settings:

1.

2.

Begin with each CV set to its default value: CV 10 = 0, CV 209 = 25, CV 210 = 20, and CV 212 = 255. In addition, set CV 2 (Vstart) to 0. With the locomotive on level track, set the throttle to around speed step 20.

  • 3.

    Adjust the value in CV 209 (Kp) with increasingly higher values just until you begin to notice some jerkiness in the locomotive speed. Reduce the setting in CV 209 to the value just before the jerkiness started.

  • 4.

    Adjust the value in CV 210 (Ki) with increasingly higher values until you begin to notice some oscillation in the locomotive speed whenever the throttle setting is changed. Reduce the setting in CV 210 to the value just before the oscillation started.

Note: When using load compensation, it is unnecessary to set large values into CV 2 (Start Voltage). This is because the load compensation algorithm will automatically adjust the motor power up to reach desired throttle setting. Therefore CV 2 can usually be set to 0 when load compensation is enabled.

Setting the Load Compensation Curve Tsunami provides two degrees of freedom for controlling the amount of load compensation applied to the motor over the throttle range using CV 10, Back- Emf Cutout and CV 212, Back-Emf Feedback Intensity.

CV 212 sets the amount of load compensation that is initially applied to the motor and may be set anywhere between 0 and 255. A value of 0 disables load compensation altogether while a value of 255 corresponds to full (100%) compensation.

CV 10, Back-Emf Cutout, determines the degree by which the load compensation is reduced as the throttle speed is increased.

When CV 10 is set to 0, the amount of load compensation set by CV 212 is constant over the entire speed range. Setting CV 10 between 1 and 127 will determine the speed step at which the load compensation is reduced to zero as illustrated in the graph on the next page.

Setting CV 10 between 128 and 255 selects a partial reduction of load

Tsunami Steam Sound User’s Guide

Page 58

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