Siemens SINAMICS G150, Operating Manual

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11/03 Electrical Installation
SINAMICS G150
Operating Manual
4-9
Shield Connection
• Shields must not be used to conduct electricity. In other words, they must not
simultaneously act as neutral or PE conductors.
• Apply the shield so that it covers the greatest possible surface area. You can
use ground clamps, ground terminals, or ground screw connections.
•
Avoid extending the shield to the grounding point using a wire (pigtail) because
this will reduce the effectiveness of the shield by up to 90%.
• Attach the shield to a shield bar directly after the line inlet into the cabinet.
Insulate the entire shielded cable and route the shield up to the device
connection, but do not connect it again.
I/O Connection
• Create a low-impedance ground connection for additional cabinets, system
components, and distributed devices with the largest possible cross-section (at
least 16 mm²).
•
Ground unused lines at one end in the cabinet.
•
Choose the greatest possible clearance between the power and signal cables
(at least 20 cm). The greater the distance over which the cables are routed in
parallel, the greater the clearance must be. If a sufficient clearance cannot be
maintained, you must install additional shields.
• Avoid unnecessarily long cable loops.
Filtering Cables
•
Line supply cables and power supply cables for devices and modules may have
to be filtered in the cabinet to reduce incoming or outgoing disturbances.
• To improve the EMC properties and depending on the installation location, a
radio interference suppression filter is recommended (e.g. option L00 (radio
interference suppression filter to EN55011, limit class A1)).