3.1 Mounting and Connections
393
7SA522 Manual
C53000-G1176-C155-3
3.1.3.2 Rack Mounting and Cubicle Mounting
Two mounting rails are required for installing a device into a frame or cabinet. The or-
dering codes are stated in the Appendix, Section A.1
For housing size
1
/
2
(Figure 3-15), there are 4 covers and 4 holes. With housing size
1
/
1
(Figure 3-16) there are 6 covers and 6 holes.
• Screw on loosely the two angle brackets in the rack or cabinet, each with four
screws.
• Remove the 4 covers at the corners of the front cover, for housing size
1
/
1
the 2
covers located centrally at the top and bottom also have to be removed. Thus the 4
respectively 6 elongated holes in the mounting bracket are revealed and can be ac-
cessed.
• Fasten the device to the mounting brackets with four or six screws.
• Mount the four or six covers.
• Tighten fast the eight screws of the angle brackets in the rack or cabinet.
• Screw down a robust low-ohmic protective earth or station earth to the rear of the
device using at least an M4 screw. The cross-sectional area of the earth wire must
be equal to the cross-sectional area of any other control conductor connected to the
device. The cross-section of the earth wire must be at least 2.5 mm
2
.
• Connections use the plug terminals or screw terminals on the rear side of the device
in accordance the wiring diagram.
For screw connections with forked lugs or direct connection, before inserting wires
the screws must be tightened so that the screw heads are flush with the outer edge
of the connection block.
A ring lug must be centred in the connection chamber so that the screw thread fits
in the hole of the lug.
Specifications regarding maximum cross sections, tightening torques, bending radii
and tension relief as specified in the SIPROTEC
®
4 System Description (Order no.
E50417-H1176-C151) must be observed. A short description on the device includes
information on this matter.
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