Connecting
6.7 Functional ground
SCALANCE SC-600
62 Operating Instructions, 10/2021, C79000-G8976-C453-04
6.7 Functional ground
EMC disturbances are diverted to ground via the functional ground. This ensures the
immunity of the data transmission.
The functional ground must be implemented with low impedance. The connection of the
functional ground must be established directly on the mounting plate or the DIN rail
terminal.
The SCALANCE SC-600 has a grounding screw (fillister head screw with clamping
washer und disk) for functional ground, refer to the section "Device views (Page 28)".
The grounding screw is identified by the following symbol for the functional ground.
1. Loosen the grounding screw).
2. Put the grounding terminal and grounding screw together.
3. Tighten the grounding screw with a maximum torque of 0.75 Nm.
Protective/functional ground
The connection of the reference potential surface with the protective ground system is
normally in the cabinet close to the power feed-in. This ground conducts fault currents
to ground safely and according DIN/VDE 0100 is a protective ground to protect people,
animals and property from too high contact voltages.
Apart from the protective ground, there is functional grounding in the cabinet. According
to EN60204-1 (DIN/VDE 0113 T1) electrical circuits must be grounded. The chassis (0 V)
is grounded at one defined point. Here, once again the grounding is implemented with
the lowest leakage resistance to ground in the vicinity of the power feed-in.
With automation components, functional ground also ensures interference-free
operation of a controller. Via the functional ground, interference currents coupled in via
the connecting cables are discharged to ground.
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