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rent track connections and align itself exactly with one of two access tracks
which should be connected to the bridge.
e) Attaching the turntable and ist access tracks to the layout:
This presupposes that after attaching and exact aligning of the access tracks
all spaces between the access tracks have been filled in with the different
filler pieces (or combinations there of ‑ see figs. 18 and 19) which additio-
nally prevents shifting of the access tracks.
Attachment of the completed turntables is done best by moderate applica-
tion of two-sided adhesive carpet tape which is cut into narrow strips and
placed in form of a turbine wheel around the cutout hole (see fig. 20). In the
area of attachment of the complete turntable to the panel, the panel surface
must be smooth, clean and free of dust, oil or grease so that good adhesion
of the tape to the panel is assured. This also applies to the underside of filler
pieces and access tracks in the vicinity of the concrete ring of the turntable
pit. Oil‑, greasedust‑ and sweat deposits reduce the effectiveness of the ad-
hesive tape. This method makes it possible to remove filler oieces relatively
easy later on as needed and to replace therr with additional access tracks
without running the risk of disturbing the exact alignment of other access
tracks to the bridge.
Installation Procedures: Mechanical
a) Wiring:
As a result of cleverly designed controls and utilization of the ROCO flat
cable- and connector system the wiring of the turntable has been reduced to
an essential minimum; the required cables are furnished with the turntable
set, complete with flat connectors attached. The 8‑conductor flat cable, fac-
tory‑equipped with connectors at each end, is used to connect the protected
but easily accessible 8‑pole contact terminal of the under‑ floor turntable
drive with the 8‑ pole (i.e. broader) contact terminal of the hand control unit
(see fig. 22, detail *).
Additional connections between turntable and control unit or turntable and
remainder of layout are not necessary!
The 5‑conductor flat cable connects the manual control unit with the control
transformer assigned to the operating centre area (see fig. 22, detail **).
The brown and green wires supply running power to the turntable bridge
track and access tracks and are connected to the running power output ter-
minals of the control transformer (0 to 12/14 volt DC if the turntable is used
on a layout operated with the 2‑rail DC system; 0 to 16 volt AC on layouts
with 3‑rail AC system). The yellow (slightly shorter) wire in the centre of the
flat cable has no function and is not connected. The grey and pink wires
supply power for control, turntable drive motor and locking magnets. The
entire control, etc. operate with alternating current (AC), therefore these
two wires are connected to the illumination/magnetic accessories output
terminal of the control transformer (see fig. 22, detail ***). The DC required
for the bridge motor is produced within the manual control unit by a built-in
rectifier.
The turntable control must never be operated with direct current (DC); even
though this would not destroy the control circuits and manual unit it would
lead to malfunctions of important turntable functions. Both the 8- and 5-
conductor cables can be extended to practically any length with the 8-con-
ductor (art.no. 10628) or 5‑conductor (art.no. 10625) flat cables, the mat-
ching flat connectors (8‑pole = art.no. 10608, 5‑pole = art.no. 10605) and
the matching connector platelets from set art.no. 10598.
Note:
When attaching the flat connectors to the contact terminals of the turntable
and manual control unit it is most important to assure that the one-sided
contact surfaces of the connectors face the contact surfaces of the turntab-
le and manual control unit terminals, otherwise neither running power nor
control commands can be transmitted!
b) Preparation of the turntable control:
The turntable can be operated with the manual control unit supplied or the
pre-setector control which is not yet available .To correctly process the con-
trol commands received the turntable must know whether the commands
come from the manual or preselector control. At the underside of the turn-
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If, around the turntable, a large number of more or less evenly placed access
tracks is available, the attachment by means of the double‑sided adhesive
tape can be replaced by piercing the capped holes in the underside of the
outermost sleeper(tie) of each access track and attaching the access track
with thin track pins. Especially the ROCO, track pins art.no. 10000 if the
connecting tracks are without ballast roadbed or in "sunken roadbed" (see
page 8, figs. 15b and 16) or ROCO art.no. 10001 if the adjacent track consist
of ROCO LINE track with roadbed and the turntable itself - see paragraph
Preparation of the surface ‑ has been sufficiently raised. When planning the
operations centre and the location of the turntable in it care must be taken
that the turntable. after permanent attachment, remains easily accessible
from the underside as well after the scenery has been completed. This makes
the placement of electrical cables and possibly the retrofit installation of
the return indication unit of the pre-selection control art.no. 42618 easier
and also facilitates the occasionally necessary maintenance- and lubrication
work (see fig. 21). It should be avoided to place tunnel tracks or hidden sto-
rage sidingsdirectly below the turntable which wili prevent or reduce access
to the underside.
table, on the cover of the underfloor turntable drive, are two slide switches,
the upper has the symbol = and ~, the lower the numbers 0 and 1 (see fig.
22, detail ° for the turntable and fig. 25, detail * for the manual control
unit):
• If the lower switch is at position "1", the turntable will interpret all
commands all commands as coming from the manual control unit.
• If the switch is moved to position "0", the turntable will interpret all
incoming commands as coming from the pre‑selector control, but it can
process the commands only if additionally all interrogation switches be-
low the access tracks have been connected to the pre-selector control.
How this is done will be described in the installation‑ and operating
instructions of the preselector control when it becomes available.
Attention:
For operation of the turntable with the manual control unit this switch must
be in position "1"!
c) Selection of the running power system:
Since the turntable has been designed for operation with both the 2-rail DC
and 3‑rail AC system, the model railway hobbyist makes the final decision
regarding the running power system by his choice of access track type (art.
no. 42616 for DC, art.no. 42617 for AC system), additionally it is necessary
to switch the electrical power path within the turntable area. This is done by
the sliding switch with the symbols = and ~ at the underfloor drive of the
turntable (see fig. 22, detail °) and an equally designated slide switch on the
underside of the manual control unit (see fig. 25, detail *).
Please note:
Reliable operation with the system selected is only assured when both run-
ning power switches are placed to the same system symbol: either both
on = or ~! Different switch positions will inevitably cause trouble during
operations.
Note:
As delivered from the factory, the turntable and manual control unit are set
for 2‑rail DC operation (both switches are set to position "=".
d) Separation of running power supply between turntable/engine
shed area and remainder of layout:
At prototype facilities, the operation centre is a separate area as far as ope-
rations and safety are concerned: in small to medium‑sized centres the rele-
vant turnouts are manually operated and engines proceed pedestrian speed
with "on sight" control. Only large operations centres have their own signal
box and possibly internal signal controls. All entry‑ and exit tracks between
the centre and other railway facilities are protected by waiting- and/or track
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