Roco LINE Mode D'emploi page 24

advisable to equip all circuit separation points in 2-rail DC system with two
GB
isolating fishplates (see fig. 27 details * and**, also fig. 28).
Note:
On layouts with digital control these separations must, in all locations, be
done in two polarities i.e. with one isolation fish plate on each rail profile!
The separation of the access tracks is principally necessary for two reasons:
• Operational reason:
Without this stopping section ahead of the turntable pit it would be
possible that a locomotive does not stop in time ahead of the pit and
runs into the pit if the bridge has not (yet) lined up with the access track.
This "event" is sometimes quite "prototypical" but neither in reality nor
on the model railway desirable...
• Electrical reason (as protection primarily during DC operation):
First, the running power of all access tracks leading to the bridge should
always be controlled from the bridge i.e. the manual control unit or the
pre-selector control because only in this situation the model railway
operator has effective control overturntable operations.
Secondly it is also an electric protection because, without this electri-
cal separation, the danger of short-circuits in the running power circuit
exists at certain positions of the bridge. Synchronization of the running
current polarity is, without greater complexity, only possible with two
separate control transformers (one for the turntable area, another for
the adjacent layout area). It is recommended to install polarity indicator
with LEDs which is easily built by the modeler (described in ROCO Report
Operating with the manual control unit
Functions of the manual control unit:
The manual control unit, together with the speed control knob of the control
transformer assigned to the turntable area, represents the command post
of the turntable operator and therefore all operations in the vicinity of turn-
table and engine shed. Fig. 29 shows the operating elements of the manual
control unit. They perform the following functions:
1
Rotation selector knob: As long as it is at rest the bridge remains fixed
in its last position. If the knob is turned shortly to the right and released
again so that it returns to its rest position, the turntable will move
towards the left until it reaches the next track connection. In this case
both bridge ends have "equal weight".
The same applies to a short turn of the knob to the right when the
bridge wili turn towards the right until it reaches the next track connec-
tion. Direct approach to a specific track, if other tracks are interspersed,
i.e. without stopping at the intervening tracks is only possible by hol-
ding the knob in the direction wanted until no more tracks are between
current bridge position and the wanted track.
2
Speed selector switch for rotation speed of the bridge. The ROCO LINE
turntable has, the same as its prototype, a slow and a moderately fast
rotation speed. If the switch is in position V1 the bridge rotates slowly
and in position V2 it rotates faster. A (prototypical) change of speeds
during the rotation is possible. in accordance with the prototype regu-
lations it is recommended to use the slow speed for short turns, the
faster for longer rotations especially when a locomotive is being turned
by 180°.
3
Selector switch for running power switch-on/off in the tracks connec-
ted to the bridge. The following applies:
a) If the switch is adjacent to the turntable symbol, the running power
in the adjacent track is turned off. If the switch is moved in direction
of the arrow away from the symbol the running power in the track
adjacent to the bridge is connected to the bridge power and will
always have the same polarity as the bridge!
24
42615 Anleitung deutsch.indd 24
no. 20, page 11, German text). It will greatly simplify the operations
within the operations centre and turntable area.
Notes:
1) As long as engine shed, storage sidings and maintenance facility tracks
do not have any connections to the other tracks on the layout and are
only connected to the turntable, no electrical separations are required in
such tracks.
2) Normally, only two or three track connections will exist between the
turntable and the other tracks, namely one track connecting the turn-
table with locomotive servicing facilities (slag removal-/coaling- and
run-around track and leading to the major entry-/exit of the operating
centre, another, the socalled auxiliary exit track which is often placed
to bypass the service tracks and leads in the direction opposite to the
major exit track. If the bypass track is not connected at both ends to
service track by turnouts but if one end leads directly to the turntable,
the third direct connection exists (see fig. 28: black shows the shortened
operation centre track plan, green the normal connection of the bypass
track via turnout, blue the alternative connection via turntable). Conse-
quently in the usual situation, only two tracks have to be equipped with
stopping sections and require installation of isolating fishplates.
3) Engine shed tracks which are only connected to the turntable and not
with any other layout tracks do not require isolating fishplates in one or
both rails since the power-on and off change is performed by the turn-
table control.
b) Please note that the left side switch always controls the running
power of the turntable (access) track adjacent to the bridge end
carrying the engine shed, white the right side switch controls the
running power of the (access) track adjacent to the bridge end which
is at the side opposite from the engine shed.
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