3.1 Mounting and Connections
253
7UM61 Manual
C53000-G1176-C127-3
3.1.3.2 Rack Mounting and Cubicle Mounting
For housing size
1
/
3
and
1
/
2
4 covering caps and 4 securing holes are provided.
To install the device in a frame or cubicle, two mounting brackets are required. Order
numbers are given in the Appendix under A.1.
• First screw loose the two angle brackets in the rack or cabinet, each with four
screws.
• Remove the 4 covers on the corners of the front plate. This accesses the 4 slots in
the mounting bracket.
• Tighten the unit with 4 screws at the angle brackets.
• Replace the 4 covers.
• Tighten fast the 8 screws of the angle brackets in the rack or cabinet.
• Connect a solid low-ohmic proection and system earthing to the rear of the unit with
at least one M4 screw. The cross section of the wire must be equal to the maximum
connection cross section area but be at least 2.5 mm
2
.
• Make connections at the device rear using plug or screw terminals in accordance
with the circuit diagram. When using spade lugs or directly connecting wires to
threaded terminals, before cable insertion the screws must be tightened so that the
heads are flush with the outside of the terminal 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 /1/ specifications regarding wire cross sections,
tightening torques, bending radii and strain relief must always be observed.
Figure 3-11 Installing a 7UM611 in a rack or cubicle (housing size 1/3)
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