Siemens SINAMICS S120 Operating Instructions Manual page 78

Electrical connection
5.2 Electromagnetic compatibility
● In order to avoid additional locations where interference can be coupled in, long cables
should be shortened or routed where there is little interference.
● If conductors or cables conduct signals of different classes, then the conductors and cables
must cross at a right angle. This especially involves sensitive and noisy signals.
– Class 1:
– Class 2:
– Class 3:
– Class 4:
Shield connection
● Do not use cable shields to conduct current. In other words, cable shields must not
simultaneously act as neutral or PE conductors.
● Apply the cable shield so that it covers the greatest possible surface area. Use ground
clamps, ground terminals or ground screw connections.
● Avoid extending the cable shield to the grounding point via a wire. This reduces the shield
effectiveness by up to 90%.
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Unshielded cables for ≤ 60 VDC
Unshielded cables for ≤ 25 VAC
Shielded analog signal cables
Shielded bus and data cables
Operator panel interfaces, incremental/absolute encoder cables
Unshielded cables for > 60 VDC and ≤ 230 VDC
Unshielded cables for > 25 VAC and ≤ 230 VAC
Unshielded cables for > 230 VAC/VDC and ≤ 1000 VAC/DC
Unshielded cables for > 1000 VAC/DC
Applications for Cabinet Modules, liquid cooled
Operating Instructions, 04/2015, A5E35974555A