Siemens SIMATIC S5-115F - Page 80

Installation Guidelines S5-115F Manual
Operating a Programmable Controller with Field Devices on Ungrounded 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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Protective conductor bar
in cabinet
Programmable controller
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Low voltage distribution
e.g. IT system
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Field devices
24 to 230 V AC load power supply unit for
AC modules
5 to 60 V AC load power supply unit for
nonfloating DC modules
5 to 60 V AC load power supply unit for
floating DC modules
Control power supply
Cabinet
Operating
ground
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L-
3-38 EWA 4NEB 811 6148-02