● 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:
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/V DC and ≤ 1000 V AC/DC
– Class 4:
Unshielded cables for > 1000 V AC/DC
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 using a wire. This reduces the shield
effectiveness by up to 90%.
Electrical connection
6.2 Electromagnetic compatibility
SINAMICS SM150 6SL3845-7NN46-7AA0
110 Operating Instructions 04/2017
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