8.2.2 Grounding concept
Components
The SINUMERIK 840D sl/ SINUMERIK ONE system consists of several individual components that
have been designed so that the system complies with the appropriate EMC and safety standards.
The individual system components are:
• Numerical Control Unit (NCU)
• Machine Control Panel (MCP), Machine Pushbutton Panel (MPP)
• Keyboard
• Operator panels (operator panel front + TCU / SIMATIC IPC for SINUMERIK)
• Distributor box and handheld unit
• S7-1500 I/O devices
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 have a cluster of operator components for ground connection/
equipotential bonding.
Example: The control panel on the swivel arm.
It is sucient in this instance to connect the ground connections of, for example, the
SIMATIC IPC for SINUMERIK, 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.
More information
More information about the EMC installation guideline can be found under:
• Conguration Manual, EMC installation guideline
8.2.3 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
• For safe and smooth operation of the system, the specied 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.
Technical data
8.2Supplementary electrical conditions
TCU 30.3
Equipment Manual, 03/2023, A5E40874197B AD 81
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