3-4
ET 200L Distributed I/O Device
EWA-4NEB 780600902-05
3.2 Configuring the Electrical Installation
In this section, you will find information on the overall installation of an
ET 200L distributed I/O device on a grounded supply (TN-S system). The
specific topics discussed are:
S Circuit-breaking devices, short-circuit and overload protection in accor-
dance with DIN VDE 0100 and DIN VDE 0113
S Load current power supplies and load circuits.
With grounded supplies, the neutral conductor of the system is grounded. A
mere ground fault between a live conductor and ground or a grounded section
of the plant causes the protective devices to trip.
Different components and protective measures are specified for erecting a
complete plant. The types of component and the degree to which the protec-
tive measures are binding depend on the DIN VDE regulation that applies to
the installation of your plant. The following table refers to Figure 3-1.
Table 3-1 DIN VDE Regulations for Installation of a Controller
Compare ...
Ref. to
Fig. 3-1
DIN VDE 0100 DIN VDE 0113
Circuit-breaking device for
PLC, sensors and signal con-
trol elements
... Part 460:
Main switch
... Part 1:
Disconnector
Short-circuit and overload-
protection:
Grouped for sensors and sig-
nal control elements
... Part 725:
Single-pole protec-
tion of circuits
... Part 1:
S With grounded
secondary cir-
cuit: single-
pole protection
S In all other
cases: all-pole
protection
Load current power supply
for AC load circuits with
more than five electromag-
netic apparatus
Galvanic isolation
by means of a
transformer is rec-
ommended
Galvanic isolation
by means of a
transformer is es-
sential
Note
The ET 200L cannot be operated with an ungrounded supply.
Introduction
Definition:
Grounded Supply
Components and
Protective Mea-
sures
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