Table of Contents
Advertisement
DOK-SUPPL*-VEH*30.2***-PR03-EN-P
Rexroth IndraControl VEH 30.2 Hand-Held Terminal
4.13.2
Electromagnetic Environment – Interference Sources, Interference
Sinks and Coupling Paths
Electromagnetic environment – in‐
terference sources, interference
sinks and coupling paths
Atmospheric discharges (light‐
Electrostatic discharges (ESD)
All electrical and electronic device that is put into circulation in Europe must,
therefore, conform to the fundamental safety requirements of the EMC Direc‐
tive. According to this Directive, electromagnetic compatibility is the ability of
a device, plant or system to work satisfactorily in the electromagnetic environ‐
ment, without itself causing electromagnetic interference that would be unac‐
ceptable to all devices, plant and systems present in this environment.
In addition to the legal requirements described above, the reliable functioning
of an electrical device is also a fundamental quality characteristic of such a
device. As well as basic information concerning electromagnetic compatibili‐
ty, the following pages describe the implementation of the EMC requirements
in respect of the IndraControl VEH 30.2 Hand-Held Terminal.
Artificial and also natural sources of interference exist in the electromagnetic
environment that can affect electrical and electronic devices.
The most well-known natural interference phenomenon is atmospheric dis‐
charge (lightning discharge).
Artificial interference sources are, on the one hand, intentional, such as mo‐
bile radio, amateur radio, TV and radio transmitters, and, on the other hand,
unintentional, such as microwave ovens, arc welding, ignition systems, high
voltage device, electric motors, electronic devices and also electrostatic dis‐
charge.
Atmospheric discharges can take place directly or indirectly on power and
nings)
communication lines. The consequence of such an impact if there is insuffi‐
cient protection is the destruction of the electrical device.
Atmospheric discharges are simulated according to the international test
standard IEC 61000-4-5 (EN 61000-4-5 for Europe) – "Electromagnetic com‐
patibility (EMC) - Part 4-5: Testing and measurement techniques. Surge im‐
munity test".
The relevant international product standard for control systems, IEC61131-2
(EN61131-2 for Europe), divides the areas of application into zones. Higher
or lower levels of interference can be expected depending on the zone in
question.
All
IndraControl VEH 30.2 are suitable for application in Zone B.
The product standard requires the testing of surge immunity according to IEC
61000-4-5.
Materials can be charged by contact followed by subsequent separation. This
effect only arises when at least one of the two materials is a non-conductor.
As a result, discharge may take place if a charged conductor, or one that is
changed by the influence of an electronic field, comes near a metallic object.
After charging, the possible voltages between the charged bodies can reach
over 10 kV.
The most frequent occurrence of electrostatic discharge takes place between
people and metallic objects. Since one is practically unnoticed of discharges
below 3,500 V and yet electronic components are destroyed by low voltages,
ESD damage to electronic components often goes unnoticed.
The international Standard IEC 61000-4-2 (EN 61000-4-2 for Europe) is used
to simulate the measurement of electrostatic discharge. The international
product standard IEC 61131-2 (EN 61131-2 in Europe) for programmable
controls demands testing to IEC 61000-4-2 and also defines the severity lev‐
el.
Bosch
Rexroth
control
Bosch Rexroth AG
41/109
Technical Data
systems
and
also
the
Advertisement
Table of Contents
