Connecting
5.3 Connecting the (24 V) DC power supply
SIMATIC Box PC 827B
28
Getting Started, 07/2008, A5E01127540-02
5.3
Connecting the (24 V) DC power supply
Note before connecting the device
WARNING
Only connect the device to 24 V DC power supply systems which meet the requirements of
a safe extra-low voltage (SELV); in addition, a protective conductor must be connected.
The conductors must withstand the short-circuit current of the 24 V DC power source, so
that a short-circuit will not damage the cable. Only connect cables with a minimum cross-
section of 1.3 mm
2
(AWG16) and a maximum cross-section of 3.3 mm
2
(AWG12).
NOTICE
The 24 V DC power source must be adapted to the input data of the device (see
specifications).
Connecting
Steps for connecting the device to the 24 V DC power supply
1 Ensure that the ON/OFF switch is in the
(OFF) position to prevent unintentional startup
of the device when connecting it to the 24 V
power supply.
2 Switch off the 24 V DC power source.
3 Insert the DC power plug.
(1) 24 V DC
(2) ground
(3) protective conductor
