3-27
ET 200U Distributed I/O Station
EWA 4NEB 812 6087–02b
An ungrounded configuration differs from a grounded one in that it has no
connection between PE (the protective ground) and the chassis ground of the
power supply. You must provide fault voltage monitoring for load circuits
that are not grounded (8).
L1
L2
L3
N
PE
(1)
(2)
(8)
ET
200U
interf.
mod.
(3)
(9)
ML+
Load
circuit
> U
Figure 3-20 Ungrounded Configuration with a 24 V DC Power Supply for an ET 200U
Interface Module
Ungrounded Con-
figuration
Mechanical and Electrical Configuration
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