Troubleshooting
Leuze electronic MLC 520 EX 45
11 Troubleshooting
11.1 What to do in case of error?
After switching the safety sensor on, the display elements (see chapter 3.3) assist in checking the correct
functionality and in faultfinding.
In case of failure, you can determine the fault from the LED displays or read a message from the 7-
segment display. With the error message you can determine the cause of the error and initiate measures
to rectifying it.
11.2 Operating displays of the LEDs
Table 11.1: Transmitter LED displays - causes and measures
NOTICE
If the safety sensor responds with an error display, you will often be able to eliminate the cause yourself.
Switch off the machine and leave it switched off.
Analyze and eliminate the cause of the fault using the following table (see table 11.1, see table 11.2,
see table 11.3).
If you are unable to rectify the fault, contact the Leuze electronic branch responsible for you or call the
Leuze electronic customer service (see chapter 13 "Service and support").
LED State Cause Measure
LED1 OFF Transmitter without sup-
ply voltage
Check the power supply unit and the electri-
cal connection. Exchange the power supply
unit, if applicable.
Red Transmitter defective Exchange the transmitter.
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