Driving curve
The speed characteristic of the locomotive is defined by the driving curve which is programmed by 3 CVs. The
standard driving curve is linear.
Recent decoders like the eMOTION XLS Sound Decoder feature 3 CVs to define the speed parameters. The
basic setting of the eMOTION XLS Sound Decoder is shown in the illustration above.
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The start voltage (CV2) defines the driving voltage of speed step1. The smaller the voltage the slower the
locomotive drives. If the PI-Load Control is “off” and the locomotive does not move in speed step 1, the start
voltage should be increased.
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The maximum speed (CV5) may be reduced by inserting smaller values.
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The mid-speed (CV6) defines how many speed steps are available. In the case CV6 is half of the value of
CV5, all speed steps are distributed equally. In case CV6 is smaller than half the value of CV5 the locomotive
will drive slower at mid-speed; the slow speed range will be extended.
As an alternative you may program the driving curve individually in 28 speed steps (CV67 - CV94). This driving
curve is activated by CV29- bit4. In this case the CVs 2, 5, and 6 are deactivated!
Motor control frequency
Basically the motor runs quieter and smoother when the control frequency is increased. The motor control
frequency is defined in 4 steps by CV9. At 24 kHz the motor is operated at its optimum and runs very quiet. A
few types of motor may require a lower setting if they do not run smoothly or get hot. The integrated load
control works only with 24 kHz. The eMOTION XLS Sound Decoder is usable with all kinds of DC motors.
eMOTION XLS Sound Decoder 12
Illustration 12: Internal Driving Curve of the eMOTION XLS Sound Decoder,
Adjustable with CV2 (Starting Voltage), CV5 (Maximum Speed), CV6 (Mid Speed)