Wiring
4-5
ET 200X Distributed I/O Device
EWA 4NEB 780601602-06
Configuring the ET 200X with ungrounded reference potential
When the ET 200X is configured with ungrounded reference potential, any
interference currents that occur are diverted to the protective ground via an RC
network in the basic module.
Insulation monitor
You must set up an insulation monitor in the following cases:
Ungrounded configuration of the ET 200X
When dangerous system states can occur as a result of double faults
ET 200X in overall configuration
Figure 4-1 shows the location of the ET 200X distributed I/O device in the overall
system (load power supply and grounding philosophy) for supply from a TN-S
system.
Ground bus
1L+
1M
ET 200X
L1
L2
L3
N
Load circuit
AC 400V for motor starters and
frequency converters
24 VDC load circuit for digital and analog
outputs and motor starters (fed via connectors
on basic module)
AC
DC
Low-voltage distribution
For example, TN-S system
(3 400 V)
PE
BM
M
internal
Data
mP
AC
DC
In an ungrounded ET 200X
configuration, there is no conĆ
nection between 1M and PE.
In the case of the ET 200X-DESINA
and ET 200X-ECOFAST:
DC 24 V-NS
Figure 4-1 Operating the ET 200X with reference potential
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