Wiring
5-6
Distributed I/O Device ET 200M
EWA-4NEB780600602-06
Features of Load Power Supplies
The load power supply feeds input and output circuits (load circuits), as well as
sensors and actuators. The characteristic features of load power supplies required
in specific applications are listed in the following table.
Characteristics of the
Load Power Supply
Mandatory for ...
Remarks
Safe (electrical) isola-
tion
Modules that have to be
supplied with
v
60V DC
or
v
25V AC
The PS 307 power supplies and the
Siemens load power supplies of the
6EP1 series have this feature.
24V DC load circuits
Output voltage toleran-
ces:
20.4 V to 28.8 V
40.8 V to 57.6 V
51 V to 72 V
24V DC load circuits
48V DC load circuits
60V DC load circuits
With high output voltage ripple we re-
commend that you provide a suppor-
ting capacitor. Rating: 200
m
F per 1A
load current (in the case of full-wave
rectification).
Rule: Ground Load Circuits
Load circuits should be grounded.
The common reference potential (ground) guarantees full functionality. Provide a
detachable connection to the protective conductor on the load power supply
(terminal L- or M) or on the isolating transformer (Figure 5-1,
). In the event of
power distribution faults, this makes it easier to localize ground faults.
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