Connecting The (24 V) Dc Power Supply - Siemens Simatic Box PC 840 V2 Getting Started

5.3

Connecting the (24 V) DC power supply

5.3
Note before connecting
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. You may connect cables with a cross section of
5 mm
Connecting
Steps for connecting the device to the 24 V DC power supply
1.
2.
3.
4.
SIMATIC Box PC 840 V2
Getting Started, Edition 05/2006, A5E00244266-02
.
2
Ensure that the ON/OFF switch is
in the '0' (OFF) position to prevent
unintentional startup of the device
when connecting it to the 24 V
power supply.
Switch off the 24 V DC power
source.
Connect the protective conductor
(3) to an appropriate screw
terminal
Connect +24 V DC (1) and 0 V DC
(2) to the screw terminals
5.3 Connecting the (24 V) DC power supply
Connecting
5-5