Redundant Power Supply; Connecting A Redundant Power Supply To The X-300Eec - Siemens SIMATIC NET SCALANCE X-300EEC Compact Operating Instructions

Connecting
6.7 Power supply
6.7.2.3

Redundant power supply

Redundancy with the 24...48 V power supply of the IE Switch X‑300EEC
The X‑300EEC is available with a single or redundant power supply unit to supply 24...48 V DC.
Each power supply unit is monitored for power failure.
The IE Switches X‑300EEC therefore provide the following options for redundancy of the
24...48 V DC power supply:
● Redundant power supply with 1 power supply unit
You can connect a redundant power supply to each 24...48 V DC power supply unit.
● Redundant power supply units 24...48 V DC
Connect 1 power supply to each power supply unit.
Since both power supply units have 2 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.
Note
Connection with redundant power supply units 24...48 V DC
If you connect an X‑300EEC with redundant power supply units 24...48 V DC to two power
supplies, you will need to connect the power supply to terminal "L1" on both power supply
units.
Only "L1" is monitored on each connector.
6.7.2.4

Connecting a redundant power supply to the X-300EEC

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.
52
Compact Operating Instructions, 11/2019, A5E02630809-14
SCALANCE X-300EEC