3.1 Mounting and Connections
391
7SA522 Manual
C53000-G1176-C155-3
3.1.2.5 Reassembly
The assembly of the device is done in the following steps:
• Insert the boards carefully in the housing. The mounting locations of the boards are
shown in Figures 3-3 and 3-4. For the variant of the device designed for surface
mounting, use the metal lever to insert the processor board C-CPU-1. Installation is
easier with the lever.
• First plug in the plug connectors of the ribbon cable onto the input/output board I/O
and then onto the processor board C-CPU-1. Be careful that no connector pins are
bent! Don’t apply force!
• Connect the plug connectors of the ribbon cable between processor module
C-CPU-1 and the front panel to the front panel plug connector.
• Press plug connector interlocks together.
• Replace the front panel and screw it again tightly to the housing.
• Replace the covers again.
• Re-fasten the interfaces on the rear of the device housing. This activity is not nec-
essary if the device is designed for surface mounting.
3.1.3 Installation
3.1.3.1 Panel Flush Mounting
Depending on the version, the device housing can be
1
/
2
or
1
/
1
. For housing size
1
/
2
,
there are 4 covers and 4 holes, as shown in Figure 3-13. There are 6 covers and 6
holes for the full housing size
1
/
1
, as indicated in Figure 3-14.
• 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.
• Insert the device into the panel cut-out and fasten it with four or six screws. For di-
mensions refer to Section 4.23.
• Mount the four or six covers.
• Connect the ground on the rear plate of the device to the protective ground of the
panel. Use at least one M4 screw for the device ground. The cross-sectional area
of the earth wire must be equal to the cross-sectional area of any other control con-
ductor connected to the device. The cross-section of the earth wire must be at least
2.5 mm
2
.
• Connect the plug terminals and/or the screwed terminals on the rear side of the
device according to the wiring diagram of the panel.
When using forked lugs for direct connections or screw terminal, the screws, before
having inserted the lugs and wires, must be tightened in such a way that the screw
heads are even with the terminal 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.
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. You will find hints in the short description
included in the device.
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