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CE Conformity, Directives and Standards KeTop T50VGA
144 User's Manual, Version: 1.3
© KEBA 2007
The emergency stop button may not, therefore, serve as the primary safety
device but is provided exclusively to cover any residual risks.
Instead of this and depending on the mode of operation, other methods
should be employed as the primary safety device, for example guards, light
barriers and two-hand control devices or enabling switches.
When the emergency stop button is activated, the entire machine or all of
the machines that are switched together in a plant must be lead to a safe
state e.g. by stopping and switching off the power to the endangering drive
mechanisms (stop categories 0 or 1 in accordance with EN 60204-1).
The release of the emergency stop button must not cause any uncontrolled
restart of the machine.
Irrespective of whether a handheld terminal has an emergency stop button
or not, permanently installed, universally identifiable and easily accessible
emergency stop buttons must be provided at selected points around the
machine in every case.
14.2.9 Application of Emergency Stop Button and Stop Button on the Handheld
Terminal
The Machinery Directive does not specify any detailed requirements in re-
spect to the colouring of the operating elements for emergency stop. The
requirement states: “The device must have clearly identifiable, clearly visi-
ble and quickly accessible controls“.
Emergency stop buttons are usually identified by red/yellow. The specific
design should have a signalling function whose effect is that any person,
and especially untrained people, can quickly recognise the control as the
device to eliminate a hazard in the case of an emergency.
One imperative requirement for equipment identified in this way is, there-
fore, that it must be possible to trigger a safe state at any time and in any
operating mode, without further knowledge of the machine (see also
EN ISO 13850).
It is not acceptable for an emergency stop button to be enabled temporarily,
since this can lead to faulty operation and life threatening loss of time in
panic situations.
If one considers handheld terminals in relation to these requirements it is
evident that a differentiation must be made as to whether an emergency
stop button on the handheld terminal may be used or not, depending on
specific criteria and applications.
14.2.9.1 Permanently installed handheld terminals: Emergency stop button
Permanently installed handheld terminals are provided with a cable by
means of which the handheld terminal is connected to the designated ma-
chine. The handheld terminal is usually connected to or disconnected from