Installation and Commissioning
Manual SCA-340 / SCA-340-L
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15
3.2.2
Power Supply
3.2.2.1
How to Connect Power
The bus controller is operated with 24 V DC. The bus controller is powered from this
source and it generates the logic voltage for the logic circuit and the analog voltage
for the analog circuit. The logic circuit supplies the internal bus including the
communication chips of all connected automation I/O terminals. The analog circuit
provides an auxiliary supply for analog signals.
Note:
While connecting the automation terminals please observe the derating of the logic
voltage, the supply of the analog terminals, and the maximum ampacity of the terminals.
Furthermore the bus controller includes connections for the supply of the mains and
segment voltage of the Inline station.
Fig 3.2.2.1 shows the basic circuit for the connections of the power supply.
Fig. 3.2.2.1:
Supply of U
M
/ U
BK
and U
S
from different sources (A) and from a common source (B)
Note:
If U
BK
/U
M
and U
S
are to be supplied from a common source, the fuse protection of the
individual sections with regard to their supply requirements has to be observed.
Note:
The current passing through terminals and potential routing contacts must not exceed
8 A.