Ungrounded Configuration With A 24 V Dc Power Supply For An Et 200U Interface Module - Siemens SIMATIC S5 ET 200U Manual

Ungrounded Con-
An ungrounded configuration differs from a grounded one in that it has no
figuration 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).
Figure 3-20 Ungrounded Configuration with a 24 V DC Power Supply for an ET 200U
ET 200U Distributed I/O Station
EWA 4NEB 812 6087–02b
Mechanical and Electrical Configuration
(1)
L1
L2
L3
N
PE
(2)
(3)
> U
(8)
M L+
Interface Module
ET
200U
interf.
(9)
mod.
Load
circuit
3-27