Unlocking Start/Restart Interlock - Leuze electronic MLC 500 Original Operating Instructions

8.4

Unlocking start/restart interlock

The reset button can be used to unlock the start/restart interlock. In this way, the responsible person can
restore the ON state of the safety sensor following process interruptions (due to triggering of protective
function, failure of the voltage supply).
Premature unlocking of the start/restart interlock may result in serious injury!
If the start/restart interlock is unlocked, the system can start up automatically.
Ä Before unlocking the start/restart interlock, make certain that no people are in the danger
zone.
The red LED of the receiver illuminates as long as the restart is locked (OSSDs off). The yellow LED illumi-
nates when the protective field is free and RES is activated (ready to be unlocked).
Ä Make certain that the active protective field is clear.
Ä Make certain that there are no people in the danger zone.
Ä Press and release the reset button within 0.15 to 4 s. The receiver switches to the ON state.
If you keep the reset button pressed longer than 4 s:
• Starting at 4 s: the reset request is ignored.
• Starting at 30 s: a +24 V short circuit is assumed on the reset input and the receiver switches to the in-
terlock state (see chapter 11.1 "What to do in case of failure?").
Leuze electronic
WARNING
MLC 520 Host/Guest
Starting up the device
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