Smart Process Gating
Leuze electronic GmbH + Co. KG
MLC 530 SPG
37
4.5.5
Override
An override is necessary in the following cases:
• The protective field is interrupted and both synchronization beams are interrupted.
and
• The CS switching signal is activated (operating mode 4 or 5).
• The CS switching signal and the TH timer hold signal are activated (operating mode 1 or 6).
WARNING
Unmonitored overrides may result in serious injury!
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An instructed person must watch the event carefully.
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If necessary, the instructed person must release the reset button immediately to stop the
dangerous movement.
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Make certain that the danger zone can be viewed from the reset button and that the entire
process can be observed by a responsible person.
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Before and during the override, ensure that there are no people in the danger zone.
Perform override
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If the safety sensor responds with an error message, perform an error reset (see chapter 12 "Trou-
bleshooting").
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Press and release the reset button within 0.15 s to 4 s.
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Press the reset button a second time and keep it pressed down.
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The OSSDs of the safety sensor are switched on.
• Case 1: valid gating condition
If a valid gating condition is found to exist, the OSSDs remain in the ON state, even if the reset button
is released. The system resumes its normal operation.
• Case 2: invalid gating condition
In these cases, the release of the OSSDs is maintained only for as long as the reset button is pressed.
NOTICE
Override not possible if there are problems with the application!
The causes of an invalid gating condition are to be investigated and remedied by a competent
person.
The OSSDs are deactivated during the override if the reset button is released or the maximum time for the
override (120 s) is exceeded.
NOTICE
The duration of the override is limited to 120 s.
If the reset button remains pressed down after 120 s, the safety sensor assumes its interlock
state after 150 s.
Thereafter, the reset button must be pressed again and held down in order to continue the process. A step-
by-step override is possible in this way.
NOTICE
If, after the button is pressed for the second time, a valid gating state is present (CS switching
signal is applied, protective field interrupted), the initiated gating sequence is continued.
The ML signal output alternately delivers 0 V and 24 V until the OSSDs are switched on again.
