Application planning
3
3.1 Secondary electrical conditions
3.1.1 Protective Separation as per EN 61800-5-1
Protective separation of the interfaces
Note
By using an extra-low voltage, all interfaces have protective separation according to Class
DVC A (SELV/PELV).
3.1.2 Grounding concept
Components
The SINUMERIK 828D 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:
● Panel Processing Unit PPU
● Machine Control Panel
● PLC I/O modules
Grounding measures
The PPU and MCP are attached with tensioners to a metal panel on the operator panel. Both
have a protective conductor connection for grounding (grounding screw) at the rear of the
device, which must be connected to the grounding bar of the control cabinet.
The SINAMICS S120 drive system is installed in the control cabinet. The electronics unit
grounds of the modules are connected to each other via DRIVE-CLiQ. The modules are
grounded either via the galvanized mounting plate or via the grounding lugs on the front of the
modules.
The PLC I/O device modules are installed in the control cabinet and grounded via a grounding
screw.
PPU
Manual, 01/2014, 6FC5397-2DP40-3BA3 35
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