Siemens CPU 412-5H Equipment Manual page 24

Assembling
5.6 Installation of fiber-optic cables
Open installation, wall breakthroughs, cable ducts:
Note the points outlined below when you install fiber-optic cables:
● The fiber-optic cables may be installed in open locations, provided you can safely exclude
any damage in those areas (vertical risers, connecting shafts, telecommunications
switchboard rooms, etc.).
● Fiber-optic cables should be mounted on mounting rails (cable trays, wire mesh ducts) using
cable ties. Take care not to crush the cable when you fasten it (see Pressure).
● Always deburr or round the edges of the breakthrough before you install the fiber-optic
cable, in order to prevent damage to the sheathing when you pull in and fasten the cable.
● The bending radii must not be smaller than the value specified in the manufacturer's data
sheet.
● The branching radii of the cable ducts must correspond to the specified bending radius of
the fiber-optic cable.
Cable pull-in
Note the points below when pulling-in fiber-optic cables:
● Always observe the information on pull forces in the data sheet of the corresponding fiber-
optic cable.
● Do not reel off any greater lengths when you pull in the cables.
● Install the fiber-optic cable directly from the cable drum wherever possible.
● Do not spool the fiber-optic cable sideways off the drum flange (risk of twisting).
● You should use a cable pulling sleeve to pull in the fiber-optic cable.
● Always observe the specified bending radii.
● Do not use any grease or oil-based lubricants.
You may use the lubricants listed below to support the pulling-in of fiber-optic cables.
– Yellow compound (Wire-Pulling, lubricant from Klein Tools; 51000)
– Soft soap
– Dishwashing liquid
– Talcum powder
– Detergent
Pressure
Do not exert any pressure on the cable, for example, by the inappropriate use of clamps (cable
quick-mount) or cable ties. Your installation should also prevent anyone from stepping onto the
cable.
Influence of heat
Fiber-optic cables are highly sensitive to direct heat, which means the cables must not be
worked on using hot-air guns or gas burners as used in heat-shrink tubing technology.
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Synchronization modules for S7-400H
Equipment Manual, 04/2020, A5E50072434-AA