Siemens Panel PC 677 Operating Instructions Manual page 18

Operating instructions (compact)
1.5 Connecting
1.5.3 Connecting the power supply (24 V DC)
General Connection Information
Note the following in order to operate the device safely and according to regulation:
Notice
Power supply network
Only connect the device to 24 V DC power supply systems which meet the requirements of a
safe extra-low voltage (SELV).
Use the supplied connector to connect it to the supply voltage.
Notice
connecting the protective conductor
A protective conductor must be connected to the device. 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 use cables with a minimum cross-section of 1.3 mm
cross-section of 3.3 mm
Connecting the power supply
Steps for connecting the device to the 24 V DC power supply
1
2
3
1-16
(AWG12).
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 supply
Connect the DC connector
(1) 24 V DC
(2) ground
(3) protective conductor
Operating Instructions (Compact), Edition 07/2006, A5E00877730-01
(AWG16) and a maximum
2
SIMATIC Panel PC 677