Measures To Prevent Interference Voltages - Siemens SIMATIC S5 Manual

5.1.6

Measures to prevent interference voltages

Overview Frequently, measures designed to suppress interference voltages are not
adopted until the controller is in operation and reception of a traffic signal is
found to be unsatisfactory. The outlay for post-installation measures (e.g.
special contactors) can often be reduced to a significant extent if you observe
the following points when configuring your control system.
Note the importance of the following:
Arrangement of
Adequate suppression of magnetic DC or AC fields in the low-frequency
devices and
range (e.g. 50 Hz) is costly. In many cases, however, the problem can be
routing of cables
solved by ensuring that the interference sink is sufficiently far away from the
interference source.
ET 200 Distributed I/O System
EWA 4NEB 780 6000-02a
Routing cables; connecting and installing bus connectors
Suitable positioning of devices and routing of cables
Grounding of all inactive metal components
Shielding of devices and lines, and
Special interference-suppression measures
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