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Handheld Terminal CE Conformity, Directives and Standards
User's Manual, Version: 1.3 143
© KEBA 2007
machine movements can also be set in motion with the handheld terminal,
knowingly or unknowingly.
The machine operator, therefore, has to find the right compromise between
necessary flexibility and a reasonable limitation of the working range when
selecting the corresponding cable length for the handheld terminal’s.
It is not possible for the working range of radio-operated handheld termi-
nal’s to be limited by means of the cable; therefore additional technical so-
lutions are required for these handheld terminal’s.
If the machine or equipment is operated with the handheld terminal, care
must be taken at this time to ensure that operation can only be controlled
by the handheld terminal and cannot be operated from any other point on
the equipment.
The hazard zone may only be entered by the person who is operating the
handheld terminal. If it should be necessary for more than one person to
work in the hazard zone at the same time, each person present requires an
enabling device and machinery movement may only be allowed after all the
enabling devices have been activated.
14.2.8 Information about the Emergency Stop Button
In theory, a perfectly designed machine should not require an emergency
stop button, since the Machinery Directive demands that a machine must
be safe throughout its lifetime and in all operating modes.
In practice, however, one is aware that unforeseen situations arise, in spite
of all precautions. In order to enable fast shutdown of the machine in these
cases, or to avert danger, an emergency stop button is provided on most
machines.
As can be seen from the following illustration, a machine is permanently in
the hazard state from the viewpoint of the emergency stop button, for as
long as this is not activated.
STOP
Neutral position (not activated)
Emergency stop button pressed
Emergency stop button functions