Troubleshooting
Leuze electronic GmbH + Co. KG
MLC 530 SPG
89
Error
Cause/description
Measures
Sensor behavior
U74
The reset input has switched
at the same time as a signal
line (cross-circuit to RES in-
put).
Eliminate the cross-circuit between
the signal lines and press the reset
button again.
OSSD remains off.
Restart interlock
not reset.
U75
Teach data inconsistent
Repeat the teach event.
OSSD remains off.
U76
Teach error
Repeat the teach event. Check
whether LED 1 on the transmitter
illuminates green.
OSSD remains off.
U80
CS signal already active on
device startup
No acknowledgment, display only
OSSD remains off.
U82
Unexpected signals upon
pressing the acknowledgment
button (min. 1 free synchro-
nization beam):
• Operating mode 1 or 6: CS
is not active or TH is active
• Operating mode 4 or 5: CS
is not active
No acknowledgment, display only
Before successful acknowledg-
ment, set CS or TH according to
operating mode.
OSSD remains off.
U83
Unexpected signals upon
pressing the acknowledgment
button (no free synchronization
beam):
• Operating mode 1 or 6: CS
is not active or TH is active
• Operating mode 4 or 5: CS
is not active
No acknowledgment, display only
Before successful acknowledg-
ment, set CS or TH according to
operating mode.
OSSD remains off.
U84
Protective field free for too
long
Check CS signal sequence, re-
duce gap in transport material
OSSD switches off.
U85
CS signal drop without protec-
tive field violation
Check CS signal sequence
OSSD remains on.
U86
One of the top four beams was
interrupted in operating
mode 6
Remove object from protective
field and restart the receiver
OSSD switches off.
