Additional Functions; Fault Diagnosis - SICK WL18-3 Manual De Operación

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Additional functions

6 Devices with special features
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Fault diagnosis

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Image: G
Alarm output: The sensor (WL(F)18-3Vxxx) features a pre-failure notification output
("Alarm" in connection diagram [B]), which issues a notification if the sensor is only rea‐
dy for operation to a limited extent. Possible causes: Sensor or reflector is contamina‐
ted, sensor is out of alignment. In the good state: LOW (0), if excessively contaminated
HIGH (1).
Test input: The WL18-3X6xx, WL18-3X7xx and WL18-3X8xx sensors feature a test input
("TI" or "Test" on the connection diagram [B]), which can be used to check that the sen‐
sor is functioning correctly: If female cable connectors with LED indicators are used,
you must ensure that the TI is assigned accordingly.
There must be no object between the sensor and reflector; activate the test input (see
the connection diagram [B], TI at 0 V for PNP). The send LED is shut down or the detec‐
tion of an object is simulated. Refer to Graphics C and G to check the function. If the
switching output fails to behave in accordance with Graphic C, check application condi‐
tions. See section Fault diagnosis.
WL18-3P030S07: sensing range: max. 2 m (with PL80A reflector), suitable for detec‐
ting transparent objects
WL18-3P030S08: sensing range: max. 2 m (with PL80A reflector), suitable for detec‐
ting transparent objects, pin 1: L+, pin 2: Q, pin 3: M, pin 4: Q/
WL18-3P430S09: with pre-set sensitivity, sensing range: max. 2.7 m (with PL80A re‐
flector), potentiometer with load point sealed
WL18-3P630S04, WL18-3P430S05, WL18-3P130S06: for extreme shock loads
WL18-3N480, WL18-3P480, WL18-3P680: without polarization filter
Table Fault diagnosis indicates which measures are to be taken if the sensor stops working.
8010585.YM42 | SICK
Subject to change without notice