IndraControl L40 Installation and Maintenance 8-11
DOK-CONTRL-IC*L40*****-PR03-EN-P
Setup with Electrical Isolation
According to DIN EN 60 204-1, electrical isolation should be provided
between the logic of the central processing unit and the I/O interfaces of
the peripheral assemblies. Accordingly, the voltage U
LS
(24 V logic
voltage) is electrically isolated from the voltages U
S
(24 V segment
voltage) and U
M
(24 V main voltage) in the IndraControl L40.
The following is an example of a setup with electrical isolation:
L1
L2
L3
N
PE
Power
supply
unit 1
OC III
400 V
OC II
24 V
U
M
U
S
U
LS
GND
GND (U
S
,
U
M
)
FE
OC II
230 V
230 V - Voltage for
programming device etc.
OC I
24 V
Power
supply
unit 3
Power
supply
unit 2
Mit_Potenzialtrennung.FH9
Fig. 8-8: Setup with electrical isolation
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