Troubleshooting
Leuze electronic GmbH + Co. KG
MLC 530 SPG
88
Error
Cause/description
Measures
Sensor behavior
E75
CS applied for longer than 20 s
after the end of the SPG se-
quence
Check CS signal sequence
OSSD switches off.
E76
CS was ended before 4 s
elapsed (operating mode 5)
Check CS signal sequence
OSSD switches off.
E77
No protective field violation af-
ter activation of the CS signal
and elapsing of the timeout
(1 h) after changing to protec-
tive mode and deactivation of
the CS signal
Check CS signal sequence
OSSD switches off.
E78
Signal error: CS/TH antiva-
lence violated during initiation/
restart with possible gating
timeout extension (operating
mode 1 or 6)
Check CS signal sequence
OSSD switches off.
E79
SPG timeout exceeded
Timeout or use TH signal
OSSD switches off.
E80 … E86
Invalid operating mode due to
setting error, general operating
mode change
E.g. reset button pressed during
start-up, check the circuit diagram
and the wiring and restart.
Locking
E87
Operating mode changed
Check the wiring. Restart the sen-
sor.
Locking
E90
Error in cascade
Please contact customer service if
you are unable to restart the de-
vice
Locking
E92, E93
Error in the saved transmission
channel
Perform channel switching again.
Automatic reset
U53
The protective field was not in-
terrupted within 4 s (2 s in op-
erating mode 4) after activation
of the CS control signal (MLC
in P-mode)
Press the RES button and start a
new sequence
Protective mode
U54
Timeout of 1 h elapsed during
P-mode (no protective field vi-
olation after applying the CS
signal) and CS has switched
back to low before this 1 h
elapsed
Check the further processing of
the OSSD signals and the design
of the system.
OSSD switches off.
U61
Teach-in not finished or not fin-
ished correctly
Repeat the teach event. Fixed
blanking: interrupt beams uniquely
or release them.
OSSD remains off.
U62
Simultaneity error of the sig-
nals from the teach button (key
switch). Time difference > 4 s
Exchange the teach button (key
switch).
OSSD remains off.
U63
2.5 min teach timeout ex-
ceeded
Maintain the correct time se-
quence during teaching.
OSSD remains off.
U69
Response time after teach-in
of floating blanking too long
(> 99 ms)
Use a device with fewer beams.
OSSD remains off.
U71
Teach data not plausible
Repeat the teach event.
OSSD remains off.