Connecting
6.4 Connecting the grounding
SCALANCE X-300
130 Operating Instructions, 05/2016, A5E01113043-20
Connecting the grounding
6.4.1
Connecting the functional ground (XR-300M EEC)
Installation on a DIN rail
The device is grounded over the DIN rail.
The device is grounded over its rear panel and the neck of the screw.
The device is grounded by the securing screw in the unpainted hole.
Please note that IE Switches X-300 must be grounded over one securing screw with
minimum resistance.
If an IE Switch X-300 is mounted on a non-conducting base, a grounding cable must be
installed. The grounding cable is not supplied with the device. Connect the paint-free surface
of the IE Switch X-300 to the nearest grounding point using the grounding cable.
● 24 VDC variant:
Grounding is via the mounting bracket on the device or alternatively/additionally via the
screw-on bolts on the rear of the device.
● 100 to 240 VAC variant:
Grounding is via the mounting bracket on the device or alternatively/additionally via the
screw-on bolts on the rear of the device.
Grounding of the X-300EEC
Functional ground
With the devices X-300EEC and XR-300M EEC 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 X-300EEC and XR-300M EEC
with 24 to 48 VDC, functional ground must be connected to the grounding bolts or the
mounting brackets (XR-300M EEC). On the X-300EEC, the functional ground is on the
bottom of the device, on the XR-300M-EEC on the side.
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.
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