Troubleshooting
Leuze electronic MLC 520 EX 46
Table 11.2: Receiver LED displays - causes and measures
11.3 Error messages 7-segment display
Table 11.3: Messages of the 7-segment display (F: internal device error, E: external error, U: usage
info during application errors)
LED State Cause Measure
LED1 OFF Device failed Replace the device.
Red
(7-segment display dur-
ing start-up: C1 or
C2 according to the
number of green LEDS
on the transmitter)
Alignment incorrect or
protective field inter-
rupted
Remove all objects from the protective field.
Align the transmitter and receiver to each
other or place blanked objects correctly con-
cerning size and position.
Red
(7-segment display dur-
ing start-up: C1. LEDs
on transmitter: both
green)
Receiver is set on C1,
transmitter on C2
Set the transmitter and receiver on the
same transmission channel and align both
correctly.
Red
(7-segment display dur-
ing start-up: C2. LED1
on transmitter: green)
Receiver is set on C2,
transmitter on C1
Remove all objects from the protective field.
Align the transmitter and receiver to each
other or place blanked objects correctly con-
cerning size and position.
Red, slowly flashing,
approx. 1 Hz
External fault Check the connection of the cables and the
control signals.
Red, flashing fast,
approx. 10 Hz
(7-segment display
F x y)
Internal fault If restart fails, exchange the device.
Green, slowly flashing,
approx. 1 Hz
Weak signal due to con-
tamination or poor align-
ment
Clean the front screens and check the align-
ment of transmitter and receiver.
LED2 Yellow Start/restart interlock is
locked and protective
field is free - ready for
unlocking
If there are no people in the danger zone,
operate the reset button.
Yellow flashing The control circuit is
open in operating
mode 1, 2 and 3
Close the input circuit with the correct polar-
ity and timing.
Faults Cause/description Measures Sensor behav-
ior
F[No. 0-255] Internal fault In the event of an unsuccessful
restart, contact customer service.
OFF Very high overvoltage (
40 V) Supply the device with the correct
voltage.
E01 Cross connection between
OSSD1 and OSSD2
Check the wiring between OSSD1
and OSSD2.
Automatic reset
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