Connecting
6.5 Power supply
SCALANCE X-300
Operating Instructions, 05/2016, A5E01113043-20
137
Image 6-3 Assignment of the LED display to the pins for redundant power supply with devices with
two power supply units
● 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.
Connecting a redundant power supply to the XR300-EEC
Device variants with 1 or 2 power supply units
There are devices variants with one power supply unit or with two power supply units. With
device variants with two power supply units, the 2nd power supply unit is also known as the
redundant power supply unit.
The connection is made using a 4-terminal plug-in terminal block to which two power supply
units can be connected (connected redundantly).
If two power supply units are connected, this is known as a redundant power supply.
Connect two power supplies as described below to achieve a correlation between the pin
assignment and LED display.
Connecting a redundant power supply to 1 power supply unit
Use "PS1" to connect the power supply of the terminal block.
Image 6-4 Assignment of the LED display to the pins for redundant power supply with devices with
one power supply unit
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