Application Planning; Secondary Electrical Conditions; Protective Separation As Per En 61800-5-1; Grounding Concept - Siemens PPU 26x.3 series Manual

Application planning

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
● SINAMICS S120 drive components
Grounding measures
The PPU and machine control panel are attached with tension jacks to a metal mounting 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 or the operator panel housing.
The PLC I/O modules are installed in the control cabinet and grounded via a grounding screw.
The SINAMICS S120 drive system is installed in the control cabinet. The electronic 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.
PPU and components
Manual, 10/2015, 6FC5397-2DP40-5BA3
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