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LD-G-33 / LD-W-33
Page 10
Load control (only with the LD-G-33)
The locomotive decoder LD-G-33 for DC motors has a load control, the
decoder LD-W-33 for AC motors does not have this function. The load
control influences the motor voltage to keep the locomotive at constant
velocity, independent of additional loads (e.g. running up a gradient,
coupled carriages).
It is possible to switch on and off the load control by varying a CV-variable
of the deocder. The parameters of the load control may be altered as well,
in order to adapt the decoder to the motor´s individual characteristics.
Parameters of the load control:
The load control is determined by
three parameters which have to be coordinated in order to achieve
optimal driving characteristics. Each of the load control parameters is
assigned to a configuration variable. The parameters are:
KP:
The proportional component of the load control ensures the
difference between the set and the present value being as small as
possible. It cannot have the value "0" at any time. This component
affects the basic speed. In case the set value is too small the
locomotive runs too slowly. In case the set value is too high the
locomotive vibrates while moving.
KI:
The integral component of the load control ensures the remaining
difference between the set and the present value is reduced to 0 and so
for the correction of very small divergences. Is the set value is too high
the locomotive vibrates massively while moving.
KD:
The differential component of the load control ensures that the control
is not converted too quickly. Is the set value to low then the locomotive
vibrates. Is the set value is too high, the locomotive shakes while moving.
Velocity characteristic
The decoder can be adjusted to the driving characteristics of the motor
and the characteristic speed of the locomotive type, by setting the starting
velocity and the maximum velocity. From the starting velocity and the
maximum velocity the decoder generates a linear velocity characteristic.