42/24-12-2 EN Advance Optima Ex Analyzer Modules Operator’s Manual 21
Connect the System Bus
System Bus Cable At the factory a 10-meter long system bus cable (8 x 0.5 mm
2
) is attached to the
Ex analyzer module (see Figure 8). The system bus cable passes through a
pressure-tight cable opening.
Figure 8
System Bus Cable
BUS IN HIGH
BUS OUT HIG
BUS END LOW
BUS IN LOW
BUS OUT LOW
BUS END HIG
B
IN
ND
BUS OUT GND
1
2
3
6
5
4
8
7
CAUTION!
The 8-conductor system bus cable attached to the Ex analyzer module
should not be shortened to less than 1 meter (note the marks on the cable)
and should not be damaged.
(Ex) Central Unit
Connection
The system bus cable should be connected to the (Ex) central unit via metal
threaded cable connections. Connect the shield to the screw fitting; to do this strip
the insulation from the system bus cable and fold the shield braid back over the
plastic insert on the screw.
Connection Box for
Distances > 10 meters
The system bus cable should be routed via a connection box if the distance
between the Ex analyzer module and the (Ex) central unit is greater than 10 meters
(see Figures 3, 4, 6 and 7).
If the connection box is installed in Zone 1, the protection level must be Increased
Safety “e”. For EMC purposes the connection box must be made of metal and
have metal threaded cable connections. Connect the system bus cable shield to
the threaded connections.
Connection Box for
Distances < 10 meters
The system bus cable should not be routed via a connection box if the distance
between the Ex analyzer module and the (Ex) central unit is smaller than 10 meters
(see Figures 2 and 5).
However, even in these cases we recommend running the system bus cable via a
connection box in order to avoid the need for opening the (Ex) central unit
housing, e.g. when the system is expanded or for maintenance work. Peripheral
devices, such as solenoid valves, can then be connected to the (Ex) central unit via
the connection box.
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