Application planning
4
4.1 Secondary electrical conditions
4.1.1 Grounding concept
Components
The SINUMERIK 840D sl system consists of a number of individual components which 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 Push Button Panel MPP
• Keyboard
• Operator panels (operator panel front + TCU/IPC)
• Distributor box and handheld unit
• S7-300 I/O with IM 153 interface module
Grounding measures
The individual modules are attached to a metal cabinet panel. Insulating paints on the mounting
points must be removed.
It is permissible to have a cluster of operator components for ground connection/PA.
Example: The control panel on the swivel arm.
It is sucient in this instance to connect the ground connections of, for example, the IPC, TCU,
and operator panel front using a cable and to route a shared grounding conductor to the central
ground connection in the control cabinet.
Additional references
Conguration Manual, EMC Guidelines
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.
NCU 7x0.3B PN
Equipment Manual, 10/2020, 6FC5397-1EP40-6BA1 33
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