Keba KeTop T100, User Manual, Page: 142 / 163

According to EN 60204, only stop categories 0 or 1 are allowed for the enabling
function, i.e. stopping the machine with the enabling device must always be
combined with switching off the power supply to the drive mechanisms.
In order to prevent incorrect, permanent activation of the enabling switch by
mechanical fixing devices, it is recommended to limit the maximum duration of
an accepted enablement. This must be achieved by means of a controller lo-
cated downstream to the handheld terminal.
An enabling device is not a replacement for a two-hand control device, which
is specified for some machines (e.g. presses) and must therefore not be con-
fused.
In contrast to the enabling device, the two-hand control device forces the en-
dangered limbs of the operator into a safe position whilst the machine is in
motion.
14.3 Electromagnetic Compatibility
The European Union obligates its member states to harmonise their statutory
provisions in respect of electromagnetic compatibility by means of Directive
2004/108/EC. In the following text this Directive is abbreviated to the EMC
Directive.
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 compatibility, the fol-
lowing pages describe the implementation of the EMC requirements in respect
of the KeTop product range of handheld terminal devices.
14.3.1 The electromagnetic environment – interference sources, interference
sinks and coupling paths
There are a number of artificial and also natural sources of interference in the
electromagnetic environment that can affect electrical and electronic device.
The most well-known natural interference phenomenon is atmospheric dis-
charge (lightning discharge).
Artificial sources of interference 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 device and also electrostatic dis-
charge.
CE Conformity, Directives and Standards KeTop T50VGA
© KEBA 2009
User's Manual V1.50 142