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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.
Decoders like the eMOTION XXL Decoder feature 3 CVs to define the speed parameters. The basic setting of
the eMOTION XXL 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 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 stretched.
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 16 kHz the motors are operating at its optimum and runs very quiet.
A few types of motors may require a lower setting if they do not run smoothly or get hot. The integrated load
control works only with 16 kHz. The eMOTION XXL Decoder is usable with all kinds of DC motors.
Load Control
The eMOTION XXL Decoder monitors the driving performance of the locomotive and regulates the driving
voltage. The load control governs the speed of the locomotive regardless of up or down grades or the length of
eMOTION XXL Decoder 8
Illustration 6: Internal Driving Curve of the eMOTION XLS Sound Decoder,
Adjustable with CV2 (Starting Voltage), CV5 (Maximum Speed), CV6 (Mid
Speed)