Central Unit
17
7SS52 V4 Manual
C53000-G1176-C182-1
Fiber-optic
module (LMZ)
For each ZPS-SK-module there is an electrical/optical signal converter module (LMZ,
with 8 optical interfaces each), fitted on the device's rear side. The receiver and trans-
mitter connection points per bay unit are consecutively numbered on the central unit's
rear plate. For the fiber-optic interfaces to the bay units, optical modules (ST) are avail-
able for substation control and servicing purposes (see Table A-1, page 328).
Terminal blocks On the rear side of the central unit, terminal blocks are provided for the external elec-
trical connection of the power supply module (SV), the I/O module (EAZ) and the com-
munication module (D-CPU). For each electrical connection point, there is one screw-
type and one snap-in connector for the station wiring. The terminal blocks are identi-
fied according to their position in a coordinate system. The connections inside a block
are numbered from left to right, see the example in Bild 2-6, page 22.
2.1.3 Design
2.1.3.1 Subrack ES902 C (SIPAC)
The subrack ES902 C (SIPAC) consists of an aluminium frame covered from all sides
by metal plates. The front and the rear plate are hinged and can be opened down-
wards for easy servicing.
The dimensions of the housing can be in Figure 9-5, page 322.
2.1.3.2 Wall-mounted housing
In this variant, the subrack is fitted into a wall-mounted housing.
All electrical and optical connections are made from the bottom side of the housing.
The door of the housing is equipped with a large glass window. The design of the wall-
mounted housing with the three components door, swing-out frame and base facili-
tates installation, operation and service.
The dimensions of the housing can be in Figure 9-8, page 325.
2.1.3.3 8MF Cubicle
In this variant, the subrack ES902 C (SIPAC) is fitted into an 8MF cubicle with swing-
out frame.
The electrical connections of the terminal blocks are prewired to a terminal strip in the
cubicle.
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