Mounting and Commissioning
3.1 Mounting and Connections
SIPROTEC, 7SD5, Manual
C53000-G1176-C169-5, Release date 02.2011
521
3.1.2.5 Reassembly
The reassembly of the device is carried out in the following steps:
• Insert the boards carefully into the housing. The mounting locations of the boards are shown in Figures 3-3
and 3-4. For the model of the device designed for surface mounting, use the metal lever to insert the pro-
cessor board C-CPU-1. Installation is easier with the lever.
• First plug in the plug connectors of the ribbon cable onto the input/output boards I/O and then onto the pro-
cessor board C-CPU-1. Be careful not to bend connector pins! Do not use force!
• Connect the plug connectors of the ribbon cable between the processor board C-CPU-1 and the front panel
to the front panel plug connector.
• Press plug connector interlocks together.
• Put on the front cover and screw it onto the housing.
• Put the covers back on.
• Re-fasten the interfaces on the rear of the device housing. This activity is not necessary if the device is de-
signed for surface mounting.
3.1.3 Mounting
3.1.3.1 Panel Flush Mounting
Depending on the version, the device housing can be
1
/
2
or
1
/
1
. With housing size
1
/
2
, there are four covers and
four holes, as shown in Figure 3-15. There are six covers and six holes for the full housing size
1
/
1
, as indicated
in Figure 3-16.
• 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.
• Insert the device into the panel cut-out and fasten it with four or six screws. For dimensions refer to Section
4.27.
• Put the four or six covers back into place.
• 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
.
• Connections are realized via the plug terminals or screw terminals on the rear side of the device according
to the circuit diagram.
When using screwed 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.
Installation notes are also given in the brief reference booklet attached to the device.
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