Operation Of The Et 200Pro With Grounded Reference Potential - Siemens ET 200pro Operating Instructions Manual

4.2

Operation of the ET 200pro with Grounded Reference Potential

Introduction
This section provides information on the overall configuration of an ET 200pro distributed I/O
system on a grounded infeed (TN-S network). The topics covered in this section are in
particular:
● Disconnecting devices, short-circuit and overload protection in accordance with
● Load voltage supplies and load circuits
Grounded infeed
For grounded infeeds, the neutral conductor of the supply system is grounded. A simple
ground fault between a live conductor and ground or a grounded part of the plant trips the
protective devices.
Safe electrical isolation (SELV/PELV to IEC 60364-4-41)
ET 200pro may only be operated on power supplies / power supply modules with safe
electrical isolation.
Configuring ET 200pro with grounded reference potential
In an ET 200pro configuration with grounded reference potential, any interference current is
discharged to protective ground. The connections must be interconnected externally (1M to
FE connection).
Components and protective measures
A number of components and protective measures are prescribed for the overall system.
The type of components and and the binding character of protective measures depend on
the DIN regulation applying to your plant. The table refers to the figure below.
Refer to ...
Disconnecting device for control
system, signal transmitters and final
controlling elements
Short-circuit and overload protection
Line protection
ET 200pro distributed I/O system
Operating Instructions, 03/2013, A5E00335544-08
VDE 0100 and VDE 0113
Reference to the
figure
①
②
⑤
4.2 Operation of the ET 200pro with Grounded Reference Potential
DIN VDE 0100
... Part 460:
Main switch
... Part 725:
Single-pole fusing of circuits
... Part 430:
Protection of cables and
lines against overcurrent
Connection
DIN VDE 0113
... Part 1:
Disconnector
... Part 1:
With grounded secondary
power circuit: single-pole
fusing
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