Siemens SCALANCE X-300 Series Operating Instructions Manual page 132

Connecting
6.6 Power supply
Connecting a redundant power supply to 1 power supply unit
Use the terminal block "X1" to connect the power supply.
L1
Figure 6-2
L1
Figure 6-3
● If the power supply fails at pins L1/M1, this is indicated by LED L1.
● If the power supply fails at pins L2/M2, this is indicated by LED L2.
Connecting a redundant power supply to 2 power supply units
To connect the power supplies, use pins L1/M1 of the left terminal block "X1" and pins L1/M1
of the right terminal block "X2". Only "L1" is monitored on each terminal block.
Since both power supply units have connectors for redundant power supply, you can connect
2 power supplies to each of the two power supply units. This should, however, only be
necessary in extremely rare situations.
132
L1 L2
M1 M2 L2 F1 F2
X1
Assignment of the LED display to the pins for redundant power supply with devices with one
power supply unit
L1 L2
M1 M2 L2 F1 F2
X1
Assignment of the LED display to the pins for redundant power supply with devices with two
power supply units
L1 M1 M2 L2 F1
X2
Operating Instructions, 11/2019, A5E01113043-24
F2
SCALANCE X-300