Since handheld terminals made by several other manufacturers are on the
market with a grey stop button and have been certified by nominated test cen-
tres, the state of the art requirement is also met.
17.10
Information about enabling control devices
Many machines have both a normal and special operating modes.
The machine fulfils its primary mission in normal (automatic) operation. In this
mode of operation, safety is guaranteed by closed, guards and/or with protec-
tive devices.
A machine’s special operating modes serve to maintain normal operation. In
doing so, safety must be guaranteed in a way that is different to normal oper-
ation, since hazardous areas of the machine can now be entered and targeted
machine movements have to be possible. The enabling control device plays a
primary role here.
This application requires the enabling control device to eliminate the hazards
that are to be controlled in a timely manner, before any personal injury occurs.
Additional safety measures may be necessary for this purpose, such as safely
reducing the speed of drive mechanisms.
In contrast to the emergency stop button respectively the stop button, a ma-
chine in special operating mode with an enabling button is in a safe state as
long as this enabling button is not activated (see illustration).
Fig.17-4:
Enabling functions
1
... "Neutral position" not activated
2
... "Enabling" pressed
3
... "Panic" pressed heavily
The enabling function is also described in EN 60204-1:2006 and corresponds
to the state of the art.
The panic position on 3 stage enabling control devices was introduced be-
cause limbs often become cramped when a person is in a state of shock and
Appendix: Machinery Safety
KeTop T10
© KEBA 2014
Project engineering manual V1.02
70
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