Siemens SIPROTEC 7SS52, Руководство по эксплуатации

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2 - 7
Siemens AG
⋅
May 1998
Two FSMA connection points are located on the botĆ
tom, next to the terminal strip, for the fibre-optical
link to the master unit. Two additional FSMA connecĆ
tion points are prepared for functional extensions of
future system developments.
The dimensions of the casing can be seen in figure
2.4.
The device is enclosed by a metalic front cover which
is electrically connected to the casing by means of
contact spring blades.
The special door mechanism facilitates commissioĆ
ning and maintenance. The mechanical structure is
earthed via a flexible wire connection.
2.4.1.2 7SS521x-5CA00-xAA0 for panel or cubiĆ
cle flush mounting
With the variant for "flush mounting" the bay units
are supplied in casings type 7XP2040-2.
The casing is completely metal-closed with a removaĆ
ble front cover with or without (ordering code "E" at
the 9th digit instead of "C") acrylic window. The inteĆ
grated button can be used to reset the LEDs while
the front cover is fitted. An earthing screw is located
on the rear of the casing.
The heavy-duty current terminals automatically short-
circuit the current transformer when the module is
withdrawn.
All signals including the auxiliary supply are connected
to terminals, located on the rear side. For each electriĆ
cal signal one screw-type and one plug-in connection
point is available for station wiring.
The plug-in modules are designated according to their
position in a coordinate system. The connections inĆ
side a module are numbered from left to right (as
seen from the rear), e.g. 1C1 and 1B4 (refer to figure
2.6).
FSMA screw-type connections are located on the
rear side for a fibre-optical interface to the master
unit.
The dimensions can be seen in figure 2.5.
2.4.2 Master unit
The master unit consists of several modules in double
Europe format and is modularly fitted in a SIPAC 19''
subrack (height 6U)
Degree of protection IP20 is guaranteed. When deliĆ
vered in a surface-mounted casing, IP55 applies and
when mounted in an 8MF-cubicle with swing-out
frame, IP54 applies.
2.4.2.1 7SS5200-xAxx0-0AAx in subrack ES902C
(SIPAC)
The subrack consists of an aluminum frame covered
from all sides by metal plates. These are perforated at
the bottom and top to cater for sufficient ventilation.
The modules are electrically interconnected by means
of an integrated bus board and plug-in elements.
The subrack's frontside is covered by a metalic plate.
This front plate is hinged and can be opened downĆ
wards after loosening the fixing screws.
The subrack holds following modules in double-EuĆ
rope format:
D Power supply (SV)
The functional unit is 4 SEP (standard mounting
space) wide.
D Input/output module (EAZ1 and EAZ2)
Up to 2 modules each with 16 alarm relays can be
used.
To each alarm relay an LED on the front plate is
allocated.
The EAZ1 allows processing of up to 7 binary inĆ
puts.
D Central processor modules protection (ZPS)
4 modules (SBK; BSZ1 to BSZ3) of this type with a
width of 2 SEP provide the protection function.
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