At the same time, the danger of misuse increases with mobility since, in remote
locations where it is not possible to observe the operating area, 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 terminal’s
to be limited by means of the cable; therefore additional technical solutions 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 equip-
ment.
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.
Fig.14-1:
Neutral position (not activated)
Fig.14-2:
Emergency stop button pressed
Tab.14-3:
Emergency stop button functions
CE Conformity, Directives and Standards
© KEBA 2009
User's Manual V1.50
137
Summary of Contents for KeTop T100
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