Ri Suppression Measures - Siemens SINUMERIK 840 sl Manual

Grounding measures
The individual modules are attached to a metal cabinet panel. Insulating paints on the mounting
points (e.g. tension jacks) must be removed.
It is permissible to cluster the operator control components regarding connection/potential
bonding.
Example: The control panel on the swivel arm.
It is sufficient in this instance to connect the ground connections of, for example, the PCU,
TCU, and operator panel front using a cable and to route a shared grounding conductor to the
central ground connection in the control cabinet.
Please note that interruption of the grounding during maintenance work is not permissible.
Additional references
EMC Design Guidelines
9.1.3

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
● Use the specified cables for safe and fault-free operation of the system.
● Connect the shield conductively at both ends to the housing for digital signal transmission.
Cable definition
Definition:
● Signal cables (example)
– Data cables (Ethernet, PROFIBUS, sensor cables, etc.)
– Digital I/Os
– Cables for safety functions (emergency stop, enabling)
● Power cables (example)
– Low-voltage supply lines (230 VAC, +24 VDC, etc.)
– Motor cables
Machine control panel: MCP 398C
Manual, 07/2018, A5E43199783B AB
9.1 Supplementary electrical conditions
Technical data
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