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ms elektronik
LD-G-43
For technical reasons, the track voltage applied to the output of some boosters is not 100 %
symmetrical. Some types of additional circuits that are connected to the track (e.g. track
occupancy detectors) also influence the track voltage on a rail. To prevent the locomotive
decoder from interpreting even a slightly unbalanced track voltage as an ABC braking section,
the sensitivity can be reduced.
Automatic shuttle train operation based on the ABC method
With the appropriate CV setting, the ABC braking procedure is used to automate shuttle train
operation between two terminal stations. When entering an ABC braking section, the
locomotive decoder automatically reduces the driving speed as usual with the set brake delay
or braking distance. After the stop, however, it changes the direction of travel and travels back
in the opposite direction with the set acceleration delay. When entering the ABC braking
section for the opposite direction, it automatically reduces the driving speed again.
2.5.2. Braking at DC voltage
The locomotive decoder LD-G-43 reacts to the application of a pure DC voltage (e.g. Märklin**
braking section) with the corresponding CV setting and then automatically reduces the driving
speed with the set brake delay or the set braking distance. In the braking section, the status
of the switched functions is retained. In contrast to the ABC braking method
the functions cannot be switched,
the CVs of the decoder cannot be changed,
the direction of travel of the locomotive cannot be changed.
As soon as the braking section is released or the locomotive moves out of the braking section,
it accelerates with the set acceleration delay up to the set speed level.
Background information: Braking with DC voltage
The braking method used e.g. by Märklin ("Märklin braking section") is based on the fact that
in the braking section, instead of an alternating positive and negative voltage, only a purely
positive or negative voltage is applied to the track. In order to prevent short circuits when
entering the braking section, an additional transition section must be inserted between the
"normal section" and the braking section, which must be a complete train length when used
in DC systems.
.
Symmetrical track voltage
in the normal section
Asymmetrical track voltage
in the transition section to
the braking section
Pure DC voltage in the
braking section
Operation overview | 15
Summary of Contents for LD-G-43
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