Siemens SINAMICS G150 Operating Instructions Manual page 76

Electrical installation
4.6 EMC compliant design
Use anti-interference elements
● If relays, contactors, and inductive or capacitive loads are connected, the switching relays
Cable installation
● Cables that are subject to or sensitive to interference should be laid as far apart from
● All cables are to be laid as close as possible to grounded enclosure parts such as
● Reserve cores of signal and data cables must be grounded at both ends to achieve an
● Long cables should be shortened or laid in noise resistant areas to avoid additional
● If it is impossible to avoid crossing cables, conductors or cables that carry signals of
Shield connection
● Shields must not be used to conduct electricity. In other words, they must not
● Apply the shield so that it covers the greatest possible surface area. You can use ground
● Avoid extending the shield to the grounding point using a wire (pigtail) because this will
● Attach the shield to a shield bar directly after the line inlet into the cabinet. Insulate the
74
or contactors must be provided with anti-interference elements.
each other as possible.
mounting plates or cabinet frames. This reduces both noise radiation and interference
injection.
additional shielding effect.
connecting points.
different classes must cross at right angles, especially if they carry sensitive signals that
are subject to interference.
– Class 1:
unshielded cables for ≤ 60 V DC
unshielded cables for ≤ 25 V AC
shielded analog signal cables
shielded bus and data cables
operator panel interfaces, incremental/absolute encoder lines
– Class 2:
unshielded cables for > 60 V DC and ≤ 230 V DC
unshielded cables for > 25 V AC and ≤ 230 V AC
– Class 3:
unshielded cables for > 230 V AC/DC and ≤ 1000 V AC/DC
simultaneously act as neutral or PE conductors.
clamps, ground terminals, or ground screw connections.
reduce the effectiveness of the shield by up to 90%.
entire shielded cable and route the shield up to the device connection, but do not connect
it again.
Converter cabinet units
Operating Instructions, 03/2012, A5E03263466A