Mounting and Commissioning
3.1 Mounting and Connections
SIPROTEC, 7SD5, Manual
C53000-G1176-C169-5, Release date 02.2011
523
3.1.3.2
Rack Mounting and Cubicle Mounting
To install the device in a rack or cubicle, a pair of mounting rails; one for top, one for bottom are required. The
ordering codes are stated in Appendix, Section A.1
For the
1
/
2
housing size (Figure 3-17), there are four covers and four holes. For the
1
/
1
housing size (Figure 3-
18) there are six covers and six 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 two covers located centrally
at the top and bottom also have to be removed. The 4 or 6 elongated holes in the mounting bracket are re-
vealed and can be accessed.
• Fasten the device to the mounting brackets with four or six screws.
• Put the four or six covers back into place.
• Tighten fast the eight screws of the angle brackets in the rack or cabinet.
• Connect a solid low-impedance protective earthing at the rear of the device with at least one M4 screw. The
cross-section of the earth wire must be equal to the cross-section of any other control conductor connected
to the device. The cross-section of the earth wire must be at least 2.5 mm
2
.
• Make the connections on the device's back panel using the plug or screw terminals as shown in the wiring
diagram.
For screw connections with forked lugs or direct connection, before inserting wires the screws must be tight-
ened 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.
The SIPROTEC 4 System Description has pertinent information regarding wire size, lugs, bending radii, etc.
Installation notes are also given in the brief reference booklet attached to the device.
Figure 3-17
Installing a device in a rack or cubicle (housing size
1
/
2
)
