REXROTH IndraControl L25 CML...3N Series, Project Planning Manual

Page: 52 / 72

L1
L2
L3
N
PE
Power
Overvoltage category III
U
M
U
S
U
LS
GND
GND (U U )
S M ,
FE
1.1 2.1
1.2 2.2
1.3 2.3
1.4 2.4
400 V
Overvoltage
24V
category II
supply
unit1
Stop
S1
Reset
L
S X7E3
ETH
X2R
Ready
Dist.
X7E1
X7E2
L
S
L
S
SER
COS
Fig.8-5: Setup without electrical isolation
Setup with Electrical Isolation
According to DIN EN 60204–1, electrical isolation should be provided between
the logic of the central processing unit and the I/O interfaces of the peripheral
devices. Accordingly, the voltage U
LS
(24 logic voltage) is electrically isolated
from the voltages U
S
(24 V segment voltage) and U
M
(24 V main voltage) in the
IndraControl L25.
The following figure shows an example of a setup with electrical isolation:
L1
L2
L3
N
PE
Power
Overvoltage
category II, 24 V
Overvoltage
category I, 24 V
U
M
U
S
U
LS
GND
GND (U U )
S M ,
FE
Trans-
2 2
+ 1.1 2.1
1.2 2.2
1.3 2.3
1.4 2.4
Overvoltage
category III 400 V
Overvoltage
category III, 400 V
230 V voltage
for programming
device, etc.
former
unit 1
supply
Power
unit 3
supply
Stop
S1
Reset
Ready
Dist.
L
S
X7E3
ETH
X2R
X7E2
X7E1
L
L
S
S
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, then this connection must be arranged at a central point (e. g. at the
load power supply unit or at the isolating transformer). In addition, it must be
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Rexroth IndraControl L25
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Installation and Maintenance