Siemens SCALANCE X320-3LD FE Operating Instructions Manual page 143

Grounding
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 number
Pin 1
Pin 2
Pin 3
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).
SCALANCE X-300
Operating Instructions, 05/2016, A5E01113043-20
WARNING
Pin assignment at terminal block 100 to 240 VAC / 60 to 250 VDC for the power supply
Assignment
L (100 to 240 V)
N
FE (functional earth)
Connecting
6.5 Power supply
143