Operating instructions

Connecting
6.3 Connecting the (24 V) DC power supply
SIMATIC Panel PC 677B
44 Operating Instructions, 05/2007, A5E01035609-01
6.3 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
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