10 Troubleshooting
This chapter describes how to identify faults on the MLG-2.
10.1 Response to faults
CAUTION
Cease operation if the cause of the malfunction has not been clearly identified.
Immediately put the machine out of operation if you cannot clearly identify the fault and
if you cannot safely remedy the problem.
10.2 SICK support
If you cannot remedy the error with the help of the information provided in this chapter,
please contact your respective SICK subsidiary.
10.3 LED indicators and error indicators
This section explains what the LED error indicators mean. The status indicators are
described in a separate section see "Display and operating elements", page 30.
LEDs on the front of the sender
Table 117: LED indicators on the sender
Yellow LED Red LED Green LED Meaning
o o o
Supply voltage off or too low
o o O
Supply voltage on
Ö 1Hz o O
Test input active
o O o
Hardware error
LEDs on the front of the receiver
Table 118: LED indicators on the receiver
Yellow LED Red LED Green LED Meaning
o o o
Supply voltage off or too low
o o O
Supply voltage on
O o O
Light path blocked (at least one beam blocked)
Ö 1Hz o O
Activate teach-in.
Ö 3 Hz o O
Contamination warning or alignment aid active
and alignment poor
Ö Ö Ö
“Find Me” function active
If multiple MLG-2s are installed in one applica‐
tion, you can activate the “Find Me” function to
identify a certain MLG-2.
o Ö 10 Hz o
Error occurred during teach-in, at least one beam
blocked
o O o
Hardware error
O O o
Synchronization error
o O O
Short-circuit
TROUBLESHOOTING 10
8018748.1Q3I/2024-12-18 | SICK O P E R A T I N G I N S T R U C T I O N S | MLG-2 ProNet
153
Subject to change without notice
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