Siemens SIMATIC NET SCALANCE W720, Operating Instructions Manual

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Connection
6.1 Safety when connecting up
SCALANCE W760 / W720
Operating Instructions, 03/2022, C79000-G8976-C322-13
39
NOTICE
Damage to the device due to potential differences
To fully eliminate the influence of electromagnetic interference, the device must be
grounded. There must be no potential difference between the following parts, otherwise
the device or other connected device could be severely damaged:
•
Housing of the SCALANCE W device and the ground potential of the antenna.
• Housing of the SCALANCE W device and the ground potential of a device connected
over Ethernet.
• Housing of the SCALANCE W device and the shield contact of the connected
Ethernet cable.
Connect both grounds to the same foundation earth or use an equipotential bonding
cable.
Safety notices on use in hazardous areas
General safety notices relating to protection against explosion
WARNING
EXPLOSION HAZARD
Do not connect or disconnect cables to or from the device when a flammable or
combustible atmosphere is present.
WARNING
EXPLOSION HAZARD
Do not press the reset button if there is a potentially explosive atmosphere.
WARNING
Unsuitable cables or connectors
Risk of explosion in hazardous areas
•
Only use connectors that meet the requirements of the relevant type of protection.
• If necessary, tighten the connector screw connections, device fastening screws,
grounding screws, etc. according to the specified torques.
• Close unused cable openings for electrical connections.
• Check the cables for a tight fit after installation.