Electrical Installation 11/03
SINAMICS G150
4-8 Operating Manual
Shield Gaps
• Bridge shield gaps (at terminals, circuit-breakers, contactors, and so on) with
minimum impedance and the greatest possible surface area.
Using Large Cross-Sections
• Use underground and grounding cables with large cross-sections or, better still,
with litz wires or flexible cables.
Laying the Motor Supply Cable Separately
• The distance between the motor supply cable and signal cable should be > 20
cm. Do not lay power cables and motor supply cables in parallel to each other.
Securing the Potential to Ground Between Modules with Widely Differing
Interference Potential
• Lay an equalizing cable parallel to the control cable (the cable cross-section
must be at least 16 mm²).
• If relays, contactors, and inductive or capacitive loads are connected, the
switching relays or contactors must be provided with anti-interference elements.
Cable Installation
• Cables that are subject to or sensitive to interference should be laid as far apart
from each other as possible.
• Noise immunity increases when the cables are laid close to the ground
potential. For this reason, you are advised to lay these cables in corners and on
the ground potential.
• Ground the spare cables at at least one end.
• Long cables should be shortened or laid in noise resistant areas to avoid
additional connecting points.
• Conductors or cables that carry signals of 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 interface, 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
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