L1
L2
L3
N
PE
U
M
U
S
U
LS
GND (U
S
,
U
M
)
FE
1.1 2.1
1.2 2.2
1.3 2.3
1.4 2.4
GND
( U
LS
)
0V
0V
+
+
1
2
(1)
Trans-
former
Power
supply
unit 1
Power
supply
unit 3
Overvoltage
category III
400 V
Overvoltage
category II
24 V
Overvoltage
category I
24 V
230 V voltage
for programming device etc.
Overvoltage
category III
400 V
e.g.
serial terminal
UK6-FSI/6 with
automatic cut-out
TCP10A of
PHOENIX CONTACT (1)
Polarity reversal can destruct the
device (fire danger) without additional
external fuse.
This is caused by simultaneous grounding of
0 V in the device and the 0 V load (PELV)
Fig.8-6:
Setup with electrical isolation
Reference Conductor Connected to the Protective Conductor
If the reference conductor (N, 0 V) is connected to the protective conductor
system, this connection must be arranged at a central point (e. g. at the load
power supply unit or at the isolating transformer). Hence, the supply current
circuit is a PELV circuit.
L1
L2
L3
N
PE
U
M
U
S
U
LS
GND
GND (U
S
,
U
M
)
FE
24 V
24 V
0 V
+
0 V
+
Disconnectable
connections
1
2
E.g.
serial terminal UK6-FSI/6 with
automatic cut-out TCP10 A
by PHOENIX CONTACT
(1)
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)
1.1 2.1
1.2 2.2
1.3 2.3
1.4 2.4
Fig.8-7:
Reference conductor connected to the protective conductor
DOK-CONTRL-ICL45L65L85-PR01-EN-P
Rexroth IndraControl L45/L65/L85 Control
Bosch Rexroth AG
57/81
Installation and Maintenance
