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① Grounding bolt

Figure6-6 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

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 de󹪝ned 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 󹪝nd the procedure described in the section "Connecting the grounding via a

grounding bolt (Page70)".

Connecting up

6.5Grounding

SCALANCE XR-300

68 Operating Instructions, 03/2023, C79000-G8976-C586-02

Siemens SIMATIC NET SCALANCE XR-300 User Manual

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