LDT Digital-Professional Series Operating Instruction

L D T
ittfinski aten echnik
Operating Instruction
Feedback Module
with integrated
8-fold track occupancy detectors
for the s88-feedback bus
from the Digital-Professional-Series !
RM-GB-8-N-F
>> finished module <<
controls up to 8 different tracks
⇒
(current detection from 0,001[1mA] up to 3 ampere).
integrated voltage control
⇒
(avoiding "track free" feedback in case of power failures).
separated by opto isolation
⇒
(between track and feedback bus).
for s88 standard connections and s88-N(5V)
⇒
(with 6-poles s88-pinbars and RJ-45 sockets].
suitable for following digital systems:
⇒
Märklin CS1 and 2, CS3 (plus) over L88 with 5V, Twin-
Center, Intellibox, HSI-88(-USB), EasyControl, ECoS,
DiCoStation.
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.
s88-N
Multi-Digital
Introduction / Safety Information:
You have purchased the 8-fold feedback module RM-GB-8-N
with integrated detection of track occupancy for your model
railway. The RM-GB-8-N is a high quality product that is supplied
within the
Digital-Professional-Series
(LDT).
We wish you having a good time using this product.
The finished module comes with 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.
• Also, note that electronic semiconductors are very sensitive to
electrostatic discharges and can be destroyed by them.
Therefore, discharge yourself before touching the modules on
a grounded metal surface (e.g. heater, water pipe or protective
earth connection) or work on a grounded electrostatic
protection mat or with a wrist strap for electrostatic protection.
• 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 RM-GB-8-N feedback module combines the occupied track
detection and the feedback report function. The 8 detectors
for occupied tracks work by detection of current. In cases a
connected track is occupied by an object with a minimum of
0,001 Ampere (1mA) consuming current, the track will be
detected as occupied.
Locomotive decoder, coach lights or axles with electrical
resistance are consumer of electrical power and therefore
induce the detection of an occupied track.
(LDT)
320102
Part-No.:
of Littfinski DatenTechnik
The maximum DC current on the tracks can be up to 3 Ampere
per output. A peak current of 7 Ampere will be possible at
short term. Then has the booster to identified the overload or
the short circuit and has to cut-off the current.
s88-N
OUT
The track voltage and the feedback bus are separated by opto-
galvanic. The current for the tracks can therefore safely be
supplied from different transformers without having a negative
effect on the digital control units.
The modular concept of occupied track detectors and
feedback decoders implements a considerable galvanical
problem: as soon as there is no electrical power on the tracks, all
tracks are detected as free because no consuming current is
detected. There are track occupied detectors available on the
market which use an auxiliary voltage to solve this problem, but
this can influence sometimes the locomotive decoder causing
disturbances and is therefore no suitable solution.
As the feedback module RM-GB-8-N has a build-in intelligence
(microprocessor Z86... [IC1], we have integrated a solution called
voltage monitor. In case of voltage drop or short circuit there is
no inaccurate "free track" detection and report back via the
feedback bus to the digital control unit or the PC. All track
occupancies will be "frozen" during this phase of voltage
interruption.
As soon as there is current on the tracks again the actual
situations on the tracks will be detected and reported back via
the feedback bus.
The RM-GB-8-N feedback module is suitable for a decentralize
installation underneath of the model railway installation. There
are 4-bores on the edges of the modules for quick and easy
installation. Suitable assembly parts (plastic distance spacers
and wood screws) are available under the order code MON-SET.
Connecting the RM-GB-8-N to Digital Central
Units respectively Interfaces:
Digital Central Units and Interfaces can control up to 496
feedback contacts via the s88-Feedback bus. Therefore will be
the occupation reports of up to 62 RM-GB-8-N evaluated.
Electrical power will be supplied from the s88-feedback bus
to all feedback modules. This will apply for the s88-standard
feedback modules and as well as for the feedback modules RM-
GB-8-N. The power consumption of the standard feedback
modules is considerable low. The RM-GB-8-N requires 0,003
Ampere (3mA) only.
The s88 feedback bus of digital central units and interfaces
can mostly supply a maximum load of up to 0.5 Amp. If the
maximum quantity of 62 feedback modules RM-GB-8-N are
connected, the bus has to supply 62 x 0,003A = 0,186A.
If you want to extend your model railway layout with RM-GB-8-
N feedback modules you can easily combine those with our
s88-N
IN