Ri Suppression Measures - Siemens SINUMERIK ONE NCU 1740 Equipment Manual

Application planning
5.1 Supplementary electrical conditions
5.1.2

RI suppression measures

In addition to the protective grounding of system components, special precautions must be
taken to ensure safe, fault-free operation of the system. These measures include shielded signal
lines, special equipotential bonding connections, and isolation and shielding measures.
Shielded signal cables
• For safe and smooth operation of the system, the specified cables must be used. Please refer
to the chapter titled Connection.
• For digital signal transmission, the shield must have a conductive connection at both sides
of the housing.
Cable definitions
• Signal cables (example)
– Data cables (Ethernet, PROFIBUS, PROFINET, sensor cables, etc.)
– Digital inputs/outputs
– Emergency Stop cables
• Power cables (example)
– Supply voltage 1 x 230 VAC or 3 x 400 VAC
– Motor cables
Rules for routing cables
In order to maximize noise immunity for the complete system (control, power unit, machine) the
following EMC measures must be observed:
• A minimum distance of 200 mm is to be observed between the signal lines and power cables.
• If necessary, signal and load cables may cross one another (if possible, at an angle of 90°), but
must never be laid close or parallel to one another.
• Only use cables approved by Siemens for the signal lines from and to the NCU.
• Signal cables may not be routed close to strong external magnetic fields (e.g. motors and
transformers).
• If signal lines cannot be routed a sufficient distance away from other cables, they must be
installed in grounded cable ducts (metal).
More information
You can find more information on interference suppression measures and the connection of
shielded cables here:
• Configuration Instructions, EMC installation guideline
support.industry.siemens.com/cs/document/60612658/emc-design-guidelines-
configuration-manual-01-2012?dti=0&lc=en-WW)
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Equipment Manual, 10/2021, A5E51087503B AA
NCU 1740