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• Connections use the 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, in such a way 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.
Figure 3-10
3.1.3.2 Rack and Cubicle Mounting
For the 1/1 housing size (Figure 3-16) there are six covers and six holes.
To install the device in a frame or cubicle, two mounting brackets are required.
•
Loosely screw the two mounting brackets in the rack or cubicle with six screws.
•
Remove the 4 covers at the corners of the front cover, for size 1/1 the two covers located centrally at the top
and bottom also have to be removed. Thus the 4 respectively 6 slots in the mounting flange are revealed
and can be accessed.
•
Fasten the device to the mounting brackets with four or six screws.
•
Mount the six covers.
•
Tighten fast the eight screws of the angle brackets in the rack or cubicle.
• Connect the ground on the rear plate of the device to the protective ground of the panel. Using at least one
M4 screw. The cross-sectional area of the ground wire must be equal to the cross-sectional area of any other
control conductor connected to the device. The cross-section of the ground wire must be at least 2.5 mm 2.
•
Connections use the 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, in such a way that the screw thread fits in the hole of the lug. The SIPROTEC 4
System Description /1/ has pertinent information regarding wire size, lugs, bending radii, etc.
SIPROTEC, 7VU681, User Manual
C53000-G1176-C368-1, Release Date 07.2012
Example of panel flush mounting of a device (housing size 1/1)
Mounting And Commissioning
3.1 Mounting And Connections
75
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