Siemens SCALANCE X-300 Series User Manual

Grounding
WARNING
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 X-300EEC, the grounding bolt is on the bottom of the device.
On the SCALANCE XR-300M EEC, the grounding bolt is on the rear of the housing between
the power connectors.
Connecting to the power supply
The connection is made via one (or two) 3-pin connector(s) on the terminal block for the power
supply.
NOTICE
Damage to the device due to incorrectly wiring the terminal blocks
With devices with a supply voltage of 100 to 240 VAC and 60 to 250 VDC, the terminal blocks
for the power supply and signaling contact are plugged in and screwed down in the device.
Both terminal blocks have three pins but coding prevents the two terminal blocks being
confused.
Make sure that the cables of the power supply and the cables for the signaling contact are
connected to the correct terminal block.
Table 6-14 Pin assignment at terminal block 100 to 240 VAC / 60 to 250 VDC for the power supply
Pin number Assignment
Pin 1 L (100 to 240 V)
Pin 2 N
Pin 3 FE (functional earth)
To wire up the power connector, use a copper cable of category 18-8 AWG or cable with a
cross-section of 0.75 to 6 mm².
DC voltage is connected at the following terminals:
● Plus to "L"
● M to "N"
Secure the firm seat of connectors and the terminal block by tightening the screws (does not
apply to X‑300EEC).
Connecting
6.6 Power supply
SCALANCE X-300
Operating Instructions, 11/2019, A5E01113043-24 139

Siemens SCALANCE X-300 Series Specifications

General

Brand	Siemens
Model	SCALANCE X-300 Series
Category	Switch
Language	English