Information SET-01 89
DIGITAL plus
not absolutely needed for DCC operations. Following is an example
on how a very simple reversing section can be built.
Example:
Using isolated track contacts and a twin-coil relay, the polarity
inside a reverse loop is switched such that when crossing the gaps,
there is no short. For example; consider the following figure when
the train travel is in clockwise direction (turnout is set to diverging
route).
a1
a2
b1
b2
~
~= /
Power Supply
for Relays
Twin-coil Relay
Isolated Track Contacts
Wiring of Reverse Loops
When passing track contact b1, the polarity of the loop is set to
allow the train to cross the gap without a short. As the reverse loop
is traversed, track contact 2 will switch the polarity in the loop, and
the adjoining gap can be crossed safely. Since in digital operations
the direction of travel is dependent on the locomotive and not track
polarity, the locomotive will not change its direction of travel when
the polarity within the reverse loop is changed.
Travelling the reverse loop counter-clockwise is done in a similar
manner, now contacts a1 and a2 ensure that proper polarity is set.
Notes:
The distance between track contacts a2 and b2 must be longer than
the longest train that travels the reverse loop.
If the reverse loop is only traversed in one direction, then either
contacts a1 and a2 or contacts b1 and b2 are not needed.
The track contacts used in this example can actually be auxiliary
contacts set by the switch machine for the switch.
If you wish to traverse the reverse loop with a locomotive without a
decoder (analog locomotive), proceed as follows:
• drive the entire train into the reverse loop (the train must be
between contacts a2 and b2)
• stop the train and change direction with your handheld (LH100).
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