Siemens SIMATIC S5-115U, Руководство пользователя

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S5-115U Manual Installation Guidelines
Operating a Programmable Controller with Field Devices on Non-grounded Supply
Neither the outer conductor nor the neutral are connected to the protective conductor in the case
of nongrounded supplies. Operation of the PLC with nonfloating power supply modules is
not
permissible.
Please note the following when connecting power supply modules:
In networks with 3 x 230 V, you can connect the power supply module direct to two outer
conductors (see Figure 3.32).
In networks with 3 x 400 V, connection between the outer conductor and the neutral conductor is
not permissible (unacceptably high voltage in the case of ground fault). Use intermediate
transformers in these networks.
Figure 3-32. Operating a Programmable Controller with Field Devices on Nongrounded Supply
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L1
L2
L3
PE
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DC
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AC
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Non-
floating
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Non-
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Floating
input
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Floating
output
Uint µ
P
Mint
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AC
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AC
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L+/L1
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L-/N
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L+
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L-
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L1
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N
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DC
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AC
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DC
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AC
Protective conductor bar
in cabinet
Programmable controller
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PE
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Low voltage distribution
e.g. IT system
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a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a
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a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a
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Field devices
24 to 230 V AC load power supply unit for
AC modules
5 to 60 V DC load power supply unit for
nonfloating DC modules
5 to 60 V DC load power supply unit for
floating DC modules
Control power supply
Cabinet
Operating
ground
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PS
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CPU
EWA 4NEB 811 6130-02b
3-39