Siemens SCALANCE X-300 Manual page 127

Connecting a redundant power supply to 1 power supply unit
Use the left terminal block to connect the power supply. The terminal block is marked "X1":
L1 M1
Figure 6-2
Assignment of the LED display to the pins for redundant power supply with devices with one
power supply unit
● 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 and pins L1/M1 of
the right terminal block. The left terminal block is marked "X1" and the right terminal block
"X2".
L1 M1
Figure 6-3
● If the power supply fails at pins L1/M1 of terminal block "X1", this is indicated by LED L1.
● If the power supply fails at pins L1/M1 of terminal block "X2", this is indicated by LED L2.
SCALANCE X-300
Operating Instructions, 10/2010, A5E01113043-10
L1 L2
M2 L2 F1
Anschluss_1_Netzteil_X-300EEC
L1 L2
M2 L2 F1
Assignment of the LED display to the pins for redundant power supply with devices with
two power supply units
F2 L1 M1 M2
F2 L1 M1 M2
L2 F1 F2
L2 F1 F2
Connecting
6.4 Power supply
127