Keba KeTop T100, User Manual, Page: 32 / 163

●
the tolerance value for the simultaneity period is exceeded,
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the feedback control loop S34 is open.
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If one enabling channel is deactivated after being simultaneously activated
(by releasing the enabling switch or in case of a defect), the output relays
K1 and K2 will return to their initial position again. The forced-guided output
contacts 13-14 and 23-24 will open. The output relays will energize again
only after both enabling channels have been deactivated and simultane-
ously activated once again.
In this way the enabling switches avoid that one single error makes the safety
function inoperational. A single error will be recognized at the next cycle at the
latest, identifying that re-enabling is no longer possible. In case of short circuit
the control relay switches to ERROR and has to be turned OFF and ON again
after resolving the error.
4.6 Foreseeable Misuse of Enabling Switch
Foreseeable misuse means the not allowed fixing of the enabling switch in the
enabling position. The foreseeable misuse of the enabling switch must be re-
stricted. The following measures causing the stop of the machine in the manual
mode are recommended:
●
Inquiry of the enabling switch when turning on the machine/plant and in-
quiry of the enabling switch when changing the operating mode from
automatic to manual (The enabling switch must not be in the enabling po-
sition.).
●
The enabling switch must be released within a defined period and pushed
into the enabling position again. The length of the period must be defined
according to the activity.
WARNING!
●
The enabling switch is only suitable as safety function if the operator acti-
vating the enabling switch recognizes the dangerous situation in time so
that he can immediately take the necessary measures to avoid such situa-
tions. As additional measure reduced speed of the movement can be nec-
essary. The allowed speed must be determined by means of a risk
assessment.
●
The enabling switch is only used to enable commands for performing dan-
gerous movements. The commands themselves must be activated by a
separate operating element (key on handheld terminal).
●
Only the person who operates the enabling switch is allowed to work in the
dangerous area.
●
For further informations regarding the enabling switch please pay attention
to
chapter 14 "CE Conformity, Directives and Standards" on page 132 .
Connection KeTop T50VGA
© KEBA 2009
User's Manual V1.50 32