Siemens SIMATIC ET 200M Manual page 93

Wiring
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
Safe (electrical) isola-
tion
Output voltage toleran-
ces:
20.4 V to 28.8 V
40.8 V to 57.6 V
51 V to 72 V
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.
5-6
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Mandatory for ...
Modules that have to be The PS 307 power supplies and the
supplied with v60V DC
Siemens load power supplies of the
or v25V AC
6EP1 series have this feature.
24V DC load circuits
With high output voltage ripple we re-
commend that you provide a suppor-
ting capacitor. Rating: 200 mF per 1A
24V DC load circuits
48V DC load circuits load current (in the case of full-wave
60V DC load circuits rectification).
Remarks
Distributed I/O Device ET 200M
EWA-4NEB780600602-06