Siemens Industrial PC Simatic Panel PC 677B - Manual (Page 22)

Connecting
4.3 Connecting the (24 V) DC power supply
SIMATIC Panel PC 677B
22
Operating Instructions (Compact), 06/2008, A5E02217246-01
Power consumption
Depending on the size of the display and taking into account 15 W per PCI slot, the power
consumption for devices with 12" and 15" operator control units is max. 140 W, and with 17"
and 19" operator control units it is max. 163 W.
4.3 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 supply must match the power consumption 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 '0'
(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 supply.
3 Attach the DC connector.
(1) 24 V DC
(2) ground
(3) protective conductor