24 Vdc - Product Group X-300Eec; Connecting A Redundant Power Supply To The X-300Eec - Siemens SCALANCE X308-2M Operating Instructions Manual

6.4.1.4

24 VDC - product group X-300EEC

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
● Redundant power supply units 24...48 V DC
6.4.1.5

Connecting a redundant power supply to the X-300EEC

Device variants with 1 or 2 power supply units
There are device variants with one power supply unit and with two power supply units.
Connect the power supply as described below to achieve a correlation between the pin
assignment and LED display.
SCALANCE X-300
Operating Instructions, 02/2012, A5E01113043-12
You can connect a redundant power supply to each 24...48 V DC power supply unit.
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.
NOTICE
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.
Connecting
6.4 Power supply
131