Functional Ground; Protective Grounding (24 V Ac/Dc Device Versions) - Siemens SCALANCE XRH-300 Product Manual

Connecting up
6.5 Grounding
①
Figure 6-6
6.5.1

Functional ground

EMC disturbances are diverted to ground via the functional ground. This ensures the immunity
of the data transmission.
According to EN60204-1 (DIN/VDE 0113 T1) electrical circuits must be grounded. The chassis (0
V) is grounded at one defined point. 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.
Requirements for functional grounding
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.
To connect the functional ground, use a copper cable of category 20 AWG or a cable with a cross-
section ≥ 0.75 mm
6.5.2

Protective grounding (24 V AC/DC device versions)

Note
Protective grounding during operation in compliance with UL 62368-1 / CSA-C22.2 No.
62368-1 and UL 61010-1 / CSA-C22.2 No. 61010-1
When you operate the device in compliance with UL 62368-1 / CSA-C22.2 No. 62368-1 and UL
61010-1 / CSA-C22.2 No. 61010-1, you must connect the protective grounding via the
grounding bolt to meet the conditions for recognition of the UL approval. The work must be
performed by a specialist according to UL 62368-1 / CSA-C22.2 No. 62368-1 and UL 61010-1 /
CSA-C22.2 No. 61010-1.
You can find the procedure described in the section "Connecting the grounding via a grounding
bolt (Page 66)".
64
Grounding bolt
Position of the grounding bolt on the rear of the device using a redundant 100 to 240 V AC /
110 to 250 V DC device version as an example
.
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SCALANCE XRH-300/XRM-300
Equipment Manual, 10/2022, C79000-G8976-C546-01