CE Conformity, Directives and Standards
KeTop T50VGA
150
User's Manual, Version: 1.3
© KEBA 2007
Atmospheric discharge is simulated in accordance with the international
test standard IEC 61000-4-5 (EN 61000-4-5 for Europe) –
Electromagnetic
compatibility (EMC). Testing and measurement techniques. Surge immunity
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 Kemro-K2 control systems and also the products of
the KeTop range are suitable for application in Zone B.
The product standard requires the testing of surge immunity in accordance
with IEC 61000-4-5.
14.3.1.2 Electrostatic discharge (ESD)
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 be-
tween people and metallic objects. Since one is practically unnoticed of
discharges below 3500 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 interna-
tional product standard IEC 61131-2 (EN 61131-2 in Europe) for program-
mable controls demands testing to IEC 61000-4-2 and also defines the se-
verity level.
14.3.1.3 Technical systems as interference sources
Technical systems can act as sources of interference. In doing so, the inter-
ference may be intentional or unintentional. Electromechanical energy is of-
ten also used for material processing.
Periodically occurring interference:
z
Ignition impulses of combustion engines
z
Sparking of commutator motors
z
Electromagnetic fields of induction furnaces, arc welding device, micro-
wave device etc.
z
Pulse currents from frequency converters and switching power supplies
z
Electromagnetic fields of radio and telecommunications device
Randomly occurring interference: