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6.4
Grounding
Functional ground
With the devices with a 100 to 240 VAC / 60 to 250 VDC power supply, functional ground must
be connected to the grounding bolts or the power supply terminal of every power supply unit.
With the devices with 24 to 48 VDC, functional ground must be connected to the grounding
bolts or the mounting brackets (XR-300M EEC).
To wire up the functional ground, use a copper cable of category 18-8 AWG or cable with a
cross-section of 0.75 to 6 mm².
Protective ground
When the device is operated with multirange power supply unit 100 to 240 VAC / 60 to 250
VDC, the protective ground is connected in addition to the functional ground.
Danger from line voltage
Grounding simply via the housing is inadequate.
In this case, connect the functional ground to ensure reliable operation.
With devices with a supply voltage of 100 to 240 VAC / 60 to 250 VDC, you should also
connect the protective earth to the grounding bolt.
On the SCALANCE XR-300M EEC, the grounding bolt is on the rear of the housing between
the power connectors.
To wire up the protective ground, use a copper cable of category 14-8 AWG or cable with a
cross-section of 1.5 to 6 mm².
Position
The connector for the grounding cable is in the center of the rear panel of the device, see
section "Dimension drawings (Page 65)".
SCALANCE XR-300M EEC
Compact Operating Instructions, 11/2019, A5E02661176-14
CAUTION
Connecting
6.4 Grounding
43
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