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CE Conformity, Directives and Standards KeTop T50VGA
148 User's Manual, Version: 1.3
© KEBA 2007
STOP STOP
"Neutral position" not activated
"Enabling" pressed "Panic" pressed heavily
Enabling functions
The enabling function is also described in EN 60204-1:1997 and corre-
sponds 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 re-
sult of the additional activation of a control button. This may be via the
handheld terminal’s membrane keyboard or graphical software buttons on
the touch screen.
An optionally available joystick can also be used to trigger the machine
movement signal.
According to EN 60204, only stop categories 0 or 1 are allowed for the
enabling function, i.e. stopping the machine with the enabling device must
always be combined with switching off the power supply to the drive
mechanisms.
In order to prevent incorrect, permanent activation of the enabling switch by
mechanical fixing devices, it is recommended to limit the maximum duration
of an accepted enablement. This must be achieved by means of a control-
ler located downstream to the handheld terminal.
An enabling device is not a replacement for a two-hand control device,
which is specified for some machines (e.g. presses) and must therefore not
be confused.
In contrast to the enabling device, the two-hand control device forces the
endangered limbs of the operator into a safe position whilst the machine is
in motion.