Keba KeTop T100, User Manual, Page: 141 / 163

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 device plays a primary
role here.
This application requires the enabling device to eliminate the hazards that are
to be controlled in a timely manner, before any personal injury occurs. Addi-
tional 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.14-4: 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 switches was introduced because limbs
often become cramped when a person is in a state of shock and as a result is
not able to release the enabling switch. For this reason, firmly pushing down
on the enabling switch also leads to switch off.
The controller must be designed in such a way that machine movement is not
initiated directly when the enabling device is activated but only as a result of
the additional activation of a control button. This may be via the handheld ter-
minal’s membrane keyboard or graphical software buttons on the touch
screen.
An optionally available joystick can also be used to trigger the machine move-
ment signal.
CE Conformity, Directives and Standards
© KEBA 2009
User's Manual V1.50 141