4. INSTALLATION
Code A dimension B dimension
NX9000 32.1 mm 90.5 mm
NX9001 68.3 mm 90.5 mm
NX9002 104.5 mm 90.5 mm
NX9003 140.7 mm 162.9 mm
NX9010 32.1 mm 90.5 mm
Table 7: Rack drilling dimensions
Nexto Series backplane rack has 6 holes for fixation. DIN 7985 M4 cross recessed pan head screws must be used in all
holes. These screws can be fixed straight in the panel or using nuts, when the panel width is too thin to create a thread. At
using nuts, it’s recommended the use of self-locking nuts to avoid it become loose.
Figure 43 identifies three types of hole: 1, 2 and 3. It’s extremely important to respect the following fixation rules for the
correct assembly of the backplane racks:
It’s recommended to use M4 washers in the screws type 1. These screws must be, mandatorily, used
It’s not possible to use washers in screws type 2. Therefore, the use of self-locking nuts or thread locking materials is
recommended. The screws for the holes type 2 are not needed, unless in cases where the assembly robustness must be
increased. It’s important to stress that these screws are placed under the modules assembled in the rack, so they must be
removed when the screws need to be retighten
It’s mandatory the use of toothed washers in the screws type 3 to guarantee the lowest electric resistance possible between
the screw and the panel, which must be grounded. The toothed washer must be type M4
ATTENTION:
The chapter Panel Design must be consulted to verify the minimum distances which must
be respected between Nexto Series backplane rack and the other components placed in the
electric panel.
4.2.1.2. Assembly
First the side covers assembly must be checked. If they are placed, they must be removed as shown on figure below.
Figure 44: Rack side covers
Before inserting the backplane rack in the panel, the screws type 1 (Figure 43) must be partially inserted.
The rack must be aligned with the screws type 1 and placed in the panel until it touches its back. Figure 45 indicates how
this procedure must be executed.
Ps: Some figures used in this subtitle don’t show the backplane rack printed circuit board to simplify the process under-
standing.
45
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