Rectifying the fault
Leuze electronic
MLD 300, MLD 500
80
11.4 Multicolor indicator
Table 11.1:
Meaning of the display of the multicolor indicator on the MLD 320, MLD 520
U41
Concurrency requirement during
muting not met: second signal out
-
side tolerance of 4 s
Check the arrangement of the muting sensors.
U42
Muting time limit exceeded
Check the muting sequence.
U43
No valid muting condition: Prema
-
ture muting end before protective
field release
Select a valid muting condition.
U51
Only one muting signal active in
case of protective field violation,
the second muting signal is miss
-
ing
Check the mounting of the muting sensors and the
triggering of the muting signals.
U54
Missing additional muting control
signal (muting-enable)
Check the connection of the muting sensor and the
triggering of the muting-enable signal. Reconnect
the muting sensor, if applicable, and activate it with
a restart.
U56
Muting restart canceled
Check the connections of the muting sensors and
carry out muting restart again if required.
U57
Partial muting: Topmost beam
interrupted
Check the object size, e.g., pallet height. Change
the operating mode (e.g., standard muting) if
required and restart.
U58
Muting-enable signal fault
Check whether 0 V is present at the muting-enable
input or if signals have been applied for longer than
8h.
U70
Weak signal
Check the alignment of the safety sensor.
Check whether the front screens are soiled and
clean them if necessary.
Fault
Cause/description
Measures
Display
Meaning
Measures
Green, continuously illumi
-
nated
OSSD on
none
Red, continuously illumi
-
nated
OSSD off
none
Red flashing, slowly (1 Hz) OSSD off, device error/wiring
error
Check the wiring.
Red flashing. quickly
(10 Hz)
OSSD off, internal error
If a restart is unsuccessful, contact cus
-
tomer service.
Green flashing, slowly
(1 Hz)
OSSD on, weak signal
Check the alignment or clean the beam
exit window.
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