Connection
4.2 Operation of the ET 200pro with Grounded Reference Potential
ET 200pro distributed I/O system
Operating Instructions, 03/2013, A5E00335544-08
69
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
VDE 0100 and VDE 0113
●
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 ...
Reference to the
figure
DIN VDE 0100
DIN VDE 0113
Disconnecting device for control
system, signal transmitters and final
controlling elements
①
... Part 460:
Main switch
... Part 1:
Disconnector
Short-circuit and overload protection
②
... Part 725:
Single-pole fusing of circuits
... Part 1:
With grounded secondary
power circuit: single-pole
fusing
Line protection
⑤
... Part 430:
Protection of cables and
lines against overcurrent
