Keba Kemro KeTop T10, Руководство по проектированию устройства

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that the operator can overlook the operating area. The handheld terminal has
the advantage that the operator can get very close to the control panel. At the
same time, the danger of misuse increases with mobility since, in remote lo-
cations where it is not possible to observe the operating area, machine move-
ments can also be set in motion with the handheld terminal, knowingly or
unknowingly. The machine operator, therefore, has to find the right compro-
mise between necessary flexibility and a reasonable limitation of the working
range when selecting the corresponding cable length for the handheld termi-
nal’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 control device and machinery movement may only be allowed after
all the enabling control devices have been activated.
17.8 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.17-1: Neutral position (not activated) Fig.17-2: Emergency stop button pressed
Tab.17-3: Emergency stop button functions
Appendix: Machinery Safety KeTop T10
© KEBA 2014
Project engineering manual V1.02 66