Bosch Rexroth IndraControl XM42 - Page 34

Reference conductor connected to the protective conductor and set up with
electrical isolation
Provide electrical isolation between the logic of the central processing unit and
the I/O interfaces of the peripheral component groups according to DIN EN
60204-1. Accordingly, the voltage U
LS
(24 V logic voltage) at the control is elec-
trically isolated from the supply voltage for the I/O modules.
50
D
60
52
53
62
61
E1
64
71
UI
65
32
E2
22
14
04
07
04
1213
45
D
03
33
56
4243
57
73
3435
a1
36
1213
03
54
64
2223
03
4647
32
66
40
13
25
76
2223
3233
a2
67
66
3233
7677
02
55
74
10
33
16
23
06
15
56
05
26
46
27
15
40
37
17
05
7071
63
7273
24
34
57
14
0405
67
24
35
77
34
1415
0001
31
12
02 06
3031 3637
00
2627
1011
44
2021
47
b2
03
b1
27
11 17
01
01
37
11
21
41
42
50
52
26
51
16
55
20
02
45
36
54
30
07
E2
a1
3637
20
a2
30
1617
0001
3031
0607
21
31
61
63
60
53
2425
43
1415
b1
b2
2425
65
22
3435
75
12
E1
1617
10
UO
0607
00
26272021
1011
02
23
0405
72
35
62
25
70
41
13
51
44
7475
FE
PE
Load power supply unit
0 V
24 V
Logic power supply unit
Separable
connections
Overvoltage
category I
24 V
24 V
0 V
Fig. 10-15: Setup with two power supply units
Dimensioning the voltage supply
Observe the maximum currents when dimensioning the voltage supply. The ope-
rating voltage allowed has to be applied directly to the device.
The voltage must also not be exceeded if:
● there are variations in line voltage, e.g. caused by different loads of the mains
● there are varying load states, such as short-circuit, normal load, lamp load or
no load
Connecting the reference conductor to the protective conductor
If the reference conductor 0 V (U
LS
) is connected to the protective conductor
system, this connection has to be arranged at a central place (e.g. at the load
power supply unit). Hence, the supply current circuit is a PELV circuit.
Floating setup
For a floating setup, disconnect the reference conductor 0 V (U
LS
) from PE and
FE, refer to "separable connection" in the previously mentioned routing images
(fig. 10-14 "Setup with power supply unit" on page 27 and fig. 10-15 "Setup with
two power supply units" on page 28). The control is connected with 0 V (U
LS
)
and the ground connection. Thus, ground connection monitoring devices can be
used.
28/65
Mounting, demounting and electric installation
IndraControl XM42 Controls
Bosch Rexroth AG R911345566_Edition 03