L1
L2
L3
N
PE
Unit 1
Overvoltage category III
400 V
Overvoltage
category II
24 V
U
S
FE
GND
GND (U
S
,
U
M
)
2.1
1.1
1.2 2.2
1.3 2.3
1.4 2.4
U
S
0V
+
U
LS
U
M
E.g.
serial terminal UK6-FSI/6 with
automatic cut-out TCP10 A
by PHOENIX CONTACT
(1)
1
2
The polarity reversal can cause the destruction of the device
(fire hazard) if there is no additional external protection.
This is caused by the simulataneous grounding of the 0V
in the device and the 0V load (PELV).
(1)
Fig.8-5:
Setup without electrical isolation
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 iso‐
lated from the voltages U
S
(24 V segment voltage) and U
M
(24 V main voltage)
in the IndraControl L45/L65/L85.
The following figure shows an example of a setup with electrical isolation:
Bosch Rexroth AG
DOK-CONTRL-ICL45L65L85-PR01-EN-P
Rexroth IndraControl L45/L65/L85 Control
56/81
Installation and Maintenance
