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2 - 8
Siemens AG ⋅ May 1998
Further 1 to 6 modules (depending on the system
configuration) are used for the data exchange with
the bay units. Each interface communication moĆ
dule (SK) can exchange data with up to 8 bay
units.
D Fibre-optical module (LMZ)
For each SK-module there is an electrical/optical
signal converter module, fitted on the device's rear
side. The receiver and transmitter connection
points per bay unit are numbered on the master
unit's rear plate.
The external electrical connections (SV, EAZ) are
designed as connection modules on the device's
rear side. For each electrical connection point,
there is one screw-type and in parallel one snap-
in connector for the station wiring.
The connection modules are designated according
to their position in a coordinate system. The conĆ
nections inside a module are numbered from left
to right, e.g. 1C1 and 5B4 .
FSMA connectors are provided for the fibre-optiĆ
cal interface to the bay units.
The optical connection via FSMA plugs to a station
control system is prepared.
The mechanical dimensions can be seen in
figure 2.7.
For the variant with surface-mounted casing the subĆ
rack is fitted into a wall-mounted casing.
All electrical and optical connections are made from
the bottom side of the casing.
The door of the casing is equipped with a large glas
window. The design of the wall-mounted casing with
the three components door, swing-out frame and
base facilitates installation, operation and service.
The mechanical dimensions can be seen in figure 2.9.
If only fibre-optic cables with anti-rodent protection
shall be used, then the number of bay units connecĆ
ted to the wall-mounted master unit should not exĆ
ceed 36.
Binary inputs and outputs from and to the protection
system are routed via the input/output modules of the
bay unit (EFE, SAF) and the master unit (EAZ1 and
EAZ2).
The protection system recognizes the information
from the station (e.g. remote reset of indications) or
from other devices (e.g. initiation of breaker failure
protection). Outputs are:
D commands for tripping the circuit breakers, which
are exclusively generated by the bay units
D alarms for remote signalling of important events
and states
D optical indications (LED).
An integrated keypad together with the built-in alphaĆ
numerical LC display allows communication with the
master unit as well as with the bay units. These opeĆ
ration elements provide for input or display of all data
necessary for processing, such as setting parameĆ
ters, station data, etc. (refer to chapter 6) as well as
read-out of relevant operations and fault events (refer
to annex A.1.2).
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