Siemens SCALANCE W788-1PRO Operating Instructions Manual page 38

Connecting up
5.6 Lightning protection, power supply, and grounding
Power supply without power grid
To operate the device without a connection to the power grid, you can use a solar panel. The
company Solis Energy (www.solisenergy.com) offers suitable solutions. The size of the
panel required depends on the daily hours of sunlight. The manufacturer provides assistance
in selecting the panel. The solar solution must be designed for 15 watts.
Grounding
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-700 and the ground potential of the antenna.
• Housing of the SCALANCE W-700 and the ground potential of a device connected over
• Housing of the SCALANCE W-700 and the shield contact of the connected Ethernet
Connect both grounds to the same foundation earth or use an equipotential bonding cable.
Interruption of the power supply
NOTICE
Damage to the Ethernet interface
Repeated fast removal and insertion of the Ethernet cable when using Power-over-Ethernet
and when there is a redundant power supply can cause damage to the Ethernet interface.
Avoid repeatedly removing and inserting the Ethernet cable when using Power-over-
Ethernet and a redundant power supply.
Notes on operating the device in a hazardous area
EXPLOSION HAZARD
DO NOT CONNECT OR DISCONNECT EQUIPMENT WHEN A FLAMMABLE OR
COMBUSTIBLE ATMOSPHERE IS PRESENT.
38
Ethernet.
cable.
WARNING
SCALANCE W788-xPRO/RR / W74x-1PRO/RR
Operating Instructions, 07/2014, A5E02280448-08