Connecting up
6
6.1 Safety when connecting up
Safety notices
When connecting up the device, keep to the safety notices listed below.
WARNING
The equipment is designed for operation with Safety Extra-Low Voltage (SELV) by a Limited
Power Source (LPS).
This means that only SELV / LPS complying with IEC 60950-1 / EN 60950-1 / VDE 0805-1 must
be connected to the power supply terminals, or the power supply unit for the equipment power
supply must comply with NEC Class 2, as described by the National Electrical Code (r) (ANSI /
NFPA 70).
If the equipment is connected to a redundant power supply (two separate power supplies),
both must meet these requirements.
NOTICE
Failure of the data trac due to contamination of optical plug-in connections
Optical sockets and plugs are sensitive to contamination of the end face. Contamination can
lead to the failure of the optical transmission network. Take the following precautions to avoid
functional impairments:
• Clean the end face of eld-assembled connectors carefully before connecting. No residues
of processing may remain on the connector.
• Only remove the dust caps of optical transceivers and pre-congured cables shortly before
connecting the cables.
• Close unused optical sockets and plugs as well as pluggable transceivers and slots with the
supplied protective caps.
SCALANCE XM-400
Operating Instructions, 03/2021, C79000-G8976-C306-10 53
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