Ri Suppression Measures - Siemens NCU 7x0.3 PN Series Manual

Application planning
4.1 Secondary electrical conditions
4.1.2

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 lines
● For safe and smooth operation of the system, the specified cables must be used. Please
● For digital signal transmission, the shield must have a conductive connection at both
Cable definitions
● Signal cables (example)
● Power cables (example)
Rules for routing cables
In order to maximize noise immunity for the complete system (controller, power section,
machine) the following EMC measures must be observed:
● A minimum distance of 200 mm is to be observed between the signal lines and power
● If necessary, signal and load cables may cross one another (if possible, at an angle of
● Only use cables approved by Siemens for the signal lines from and to the Control Unit.
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refer to the chapter titled Connection.
sides of the housing.
– Data cables (Ethernet, PROFIBUS, PROFINET, sensor cables, etc.)
– Digital inputs/outputs
– EMERGENCY OFF lines
– Supply voltage 1 x 230 V AC or 3 x 400 V AC
– Motor cables
cables.
90°), but must never be laid close or parallel to one another.
NCU 7x0.3 PN
Manual, 09/2011, 6FC5397-1EP40-0BA0