User manual

Littfinski DatenTechnik (LDT)
Operating Instruction
8-fold track occupancy
detector
from the Digital-Professional-Series !
GBM-8-F Part-No.: 020002
>> finished module <<
⇒ monitoring 8 track sections
(current sensing from 0,001[1mA] up to 3 Ampere)
⇒ suitable for the feedback modules
RM-88-N-O / RM-DEC-88-O and Roco 10787
⇒ no separate power supply required
This product is not a toy! Not suitable for children under 14 years of age! The kit
contains small parts, which should be kept away from children under 3! Improper
use will imply danger of injuring due to sharp edges and tips! Please store this
instruction carefully.
CE Part-No.:
40 43 98
Introduction / Safety Information:
You have purchased the 8-fold track occupancy detector GBM-
8 for your model railway layout. The GBM-8 is a high quality
product that is supplied within the Digital-Professional-Series
of Littfinski DatenTechnik (LDT).
We wish you having a good time using this product.
The finished modules and the finished modules in a case come
with a 24 month warranty.
• Please read the following instructions carefully. Warranty will
expire due to damages caused by disregarding the operating
instructions. LDT will also be not liable for any consequential
damages caused by improper use or installation.
Connecting the module to your digital model
railway:
• Attention: Please switch off your digital control unit and
unplug all transformers from AC-current before starting
to assemble the unit.
General functional description:
The 8 track occupancy sensors of the GBM-8 are working in
accordance to the current sensing principle. If there is a
current consumer on a connected track section which is
consuming a minimum of 0,001 Ampere (1mA) this section will
be monitored as occupied.
Loc-decoder, coach illumination or resistance wheel sets are
electrical consumers which can release an occupancy signal.
The maximum rail current can be up to 3 Ampere on each
output. Temporary is even 7 Ampere permitted on each output.
Connecting the GBM-8 to the Roco feedback
module 10787:
For the connection of the GBM-8 to the Roco feedback module
at first the sensor outputs of the GBM-8 have to be connected
to the sensor inputs of the feedback module 10787.
The clamps are exact identical marked. The wiring is very
simple when the sensor clamps of the track occupancy detector
and the feedback module will be situated opposite (attend to the
figure 1 at the rear side of this instruction).
Connecting track sections:
As Roco-Digital contains no explicit color identification for the
two digital voltage wires (both wires are black) the input clamps
for the digital current at the GBM-8 are marked with “J” and “K”.
On DCC layouts the clamp marked with “J“ is normally the
common ground terminal. Therefore is the terminal “J” at the
occupancy detector the pole of the digital voltage that has to be
connected to the non-interrupted rail.
The terminal “K” of the digital voltage has to be connected to
the rail that has been interrupted for monitoring purposes.
The isolated rail sections which shall be monitored have to be
connected to the inputs 1 to 8.
As the feedback module 10787 contains two times 4 inputs the
occupancy detector GBM-8 has been designed accordingly.
Therefore is it possible to monitor 4 track sections each at two
different booster areas (figure 2 at the rear side).
If you want to control a reversing loop which will change the
polarity via the reversing loop module KSM-SG you should
install the wiring as per figure 3.
At the sample will be the reversing loop incl. sensor tracks
controlled by the output 8 of the GBM-8. The remaining 7
outputs of the GBM-8 can supply furthermore the isolated track
sections at the range of the “Standard Track” outside of the
reversing loop.
The GBM-8 is as well suitable for the direct connection to the
feedback module RM-88-N-O for the s88-feedback bus
(figure 4).
With the GBM-8 is it possible to extend the RM-88-N-O with the
function of “track occupancy monitoring”.
Colored drafts can be found at our web-site within the area
“Sample Connections”.
Accessories:
For safe installation of the 8-fold track occupancy detector
GBM-8 below your model layout we offer an installation set
under the order code MON-SET and for the assembled kits a
sturdy exact matching case (order code: LDT-01).