Ri Suppression Measures - Siemens SINUMERIK 840D sl Manual

NOTICE
If the connecting cable (e.g. PROFIBUS) is routed through several control cabinets, an
equipotential bonding conductor is to be connected to the Control Unit's "potential
connection". A finely stranded copper conductor with a 4 mm² cross-section must be used.
The equipotential bonding conductor is to be routed together with the connecting cable.
Additional references
/EMV/ EMC Installation Guide
2.1.4

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 cables, special equipotential bonding, isolation, and shielding measures.
Shielded signal lines
● To ensure safe, fault-free operation of the system, it is essential to use the cables
● For digital signal transmission, the shielding must always be connected to the housings at
Cable definitions
● Signal cables (example)
● Load cables (example)
NCU
Manual, 07/2007, 6FC5397-0AP10-2BA0
specified in the individual diagrams.
both ends.
Exception:
If non-Siemens devices are connected (printers, programming devices, etc.), standard
shielded cables grounded at one end can also be used. However, these devices must not
be connected to the controller during normal operation. However, if the system cannot
operate without them, then the cable shields must be connected at both ends.
Furthermore, the non-Siemens device must be connected to the controller via an
equipotential bonding cable.
– Data cables (Ethernet, PROFIBUS, sensor cables, etc.)
– Binary inputs and outputs
– EMERGENCY OFF lines
– Low-voltage supply lines (230 V AC, +24 V DC, etc.)
– Supply cables to contactors (primary and secondary circuit)
Application Planning
2.1 Secondary electrical conditions
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