Siemens SINAMICS S120 Equipment Manual page 54

Electrical installation
4.4 EMC-compliant design
Using large cross sections
● Use underground and grounding cables with large cross sections or, better still, with litz
Use anti-interference elements
● If relays, contactors, and inductive or capacitive loads are connected, the switching relays
● If you attach an equalizing cable in parallel to the control cable, it must have a cross
Laying the motor supply cable separately
● The distance between the motor cable and signal cable should be > 20 cm. Do not lay
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
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wires or flexible cables.
or contactors must be fitted with anti-interference elements.
section of at least 16 mm².
signal cables and motor cables in parallel to each other.
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 cables
– 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
S120 Cabinet Modules Equipment Manual
Manual, (GH5), 10/2008, A5E00427098A