Compact Operating Instructions
1.8 Connecting
SIMATIC HMI IPC477C / HMI IPC477C PRO
Compact Operating Instructions, 10/2010, A5E02368072-02
19
1.8.2
Connecting the 24 VDC power supply
To be noted before you connect the device
Note the following in order to operate the device safely and according to regulation:
WARNING
The generation of the 24 VDC supply voltage by the line-side power supply must be made
as functional extra-low voltage with safe electrical isolation according to IEC 60364--4--41
or as SELV in conformity to IEC/UL/EN/DIN-EN 60950-1 and LPS / NEC Class 2.
The PE conductor on the device needs to be connected to the PE conductor which is
integrated in the cabinet.
NOTICE
The 24 VDC power source must be adapted to the input data of the device (see the
technical specifications in the operating instructions).
NOTICE
Permissible conductor cross-section for the 24 VDC connecting cable: 0.75 mm
2
to
2.5 mm
2
.
NOTICE
If a Compact Flash card is used in the device, make sure that the card is seated correctly
before you connect it.
On-off switch
CAUTION
Power is on
The On/Off switch does not isolate the device from the power supply.
Always disconnect the power cord to isolate the device from the power supply.
Position of the on/off switch
The on/off switch
①
turns off the output voltages of
the power supply without isolating the unit from
mains.
Delivery condition: Power switch turned off.
