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8012428/YWL2/3-0/2016-08| SICK O P E R A T I N G I N S T R U C T I O N S | DUSTHUNTER T
Subject to change without notice
TROUBLESHOOTING 6
Message Significance Possible cause Action
Reflector communication
(only for DUSTHUNTER
T200)
No connection between
sender/receiver unit and
reflector
Connection line not connected or
not connected correctly
Defective connection line
Defective reflector
RS485 interface of the sender/
receiver unit defective
Check the connection line
Contact SICK Customer Service.
LED monitor overflow Overmodulation of the
monitor channel during
scaling
Incorrect alignment of the optical
axes of sender/receiver unit and
reflector
Check/correct alignment.
Repeat scaling
Q1-4 overflow Group signal of quadrant
measurement too high
Measuring system not scaled
Changed alignment of optical
axes
Reduced active measuring path
Wrong reflector
Scale measuring system.
Check/correct alignment.
Contact SICK Customer Service.
Set reference Scaling not possible Measurement or monitor signal
too low (contamination, incorrect
alignment)
Check/correct alignment.
Clean the optical surfaces (see
“Maintenance on the sender/
receiver unit and reflector”,
page 95).
Contamination (not for
DUSTHUNTER T50)
Contamination value is
higher than the permit-
ted limit value (see
“Technical Data”,
page 112)
Deposits on the optical inter-
faces
Unclean purge air
Clean the optical surfaces (see
“Maintenance on the sender/
receiver unit and reflector”,
page 95).
Check purge air filter (see
“Optional external purge air
unit”, page 103).
Contact SICK Customer Service.
Power supply (24 V) < 18 V Supply voltage too low Line provided by customer does
not match the specification (see
“Connecting the MCU control
unit”, page 50)
Voltage loss on the connection
line (core cross-section too low in
relation to the line length)
Check the connection line
Contact SICK Customer Service.
Power supply (24 V) < 19 V
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