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Connecting
6.2 Connecting the 24 V DC power supply
6.2
Connecting the 24 V DC power supply
To be noted before you connect the device
Note the following in order to operate the device safely and according to regulation:
The device should only be connected to a 24V DC power supply which satisfies the
requirements of safe extra low voltage (SELV).
If the device is used on a wall, in an open rack or other similar locations, an NEC Class 2
current source is required in order to meet the UL requirements (UL 60950-1). In all other
cases (IEC / EN / DIN EN 609501) either a current source of limited output (LPS = Low
Power Source), or a line-side fuse or a line-side circuit breaker is necessary. The power
needs to be limited to a value below 4.16 A. The fuse value required: Max. 4 A.
Use the special plug supplied to connect the supply voltage. Connect the PE conductors as
described in the next section.
NOTICE
The permitted cable cross-section for the 24 VDC connection is 0.75 mm
NOTICE
If a CompactFlash card is used in the device, make sure that the card is seated correctly
before you connect it.
Connecting
Steps for connecting the device to the 24 V DC power supply
1.
2.
3.
34
WARNING
Switch off the 24 V DC power source.
Connect the power supply using the plug
(included in the package).
Connect the PE conductor.
to 2.5 mm
2
Operating Instructions, 04/2009, A5E02414743-01
.
2
SIMATIC IPC427C
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