Functions; Start/Restart Interlock Res; Edm Contactor Monitoring - Leuze electronic MLC 520 EX Series Original Operating Instructions

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Functions

An overview of features and functions of the safety sensor can be found in chapter Device description
(see chapter 3.1 "Device overview").
Overview of functions
• Start/restart interlock (RES)
• EDM
• Range reduction
• Transmission channel changeover
4.1

Start/restart interlock RES

After accessing the protective field, the start/restart interlock ensures that the safety sensor remains in the
OFF state after the protective field has been cleared. It prevents automatic release of the safety circuits
and automatic start-up of the system, e.g. if the protective field is again clear or if an interruption in the
voltage supply is restored.
For access guarding, the start/restart interlock function is mandatory. The protective device may
only be operated without start/restart interlock in certain exceptional cases and under certain
conditions acc. to EN ISO 12100.
WARNING
Deactivation of the start/restart interlock may result in serious injury!
 Implement the start/restart interlock on the machine or in a downstream safety circuit.
Use start/restart interlock
 Wire the MLC 520 receiver appropriately for the desired operating mode (see chapter 7 "Electrical con-
nection")
The start/restart interlock function is automatically activated.
Switching the safety sensor back on after shutting down (OFF state):
 Press the reset button (press/release between 0.1 s and 4 s)
The reset button must be located outside the danger zone in a safe place and give the operator
a good view of the danger zone so that he/she can check whether anyone is located in it before
pressing the reset button.
DANGER
Risk of death if start/restart is operated unintentionally!
 Ensure that the reset button for unlocking the start/restart interlock cannot be reached from the danger
zone.
 Before unlocking the start/restart interlock, make certain that no people are in the danger zone.
After the reset button has been actuated, the safety sensor switches to the ON state.
4.2

EDM contactor monitoring

The contactor monitoring of the MLC 520 safety sensors can be activated through appropriate
wiring (see table 7.2)!
The "contactor monitoring" function monitors the contactors, relays or valves connected downstream of
the safety sensor. Prerequisite for this are switching elements with positive-guided feedback contacts
(normal closed contacts).
Leuze electronic MLC 520 EX
Functions
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