Additional Functions; Troubleshooting - SICK HL18 Instrucciones De Uso

7
COMMISSIONING
7.4

Additional functions

8

Troubleshooting

20
Alarm / Health output
Alarm output: The sensor (HL18(G/T)(L)) features a pre-failure notification output ("Q2"
in connection diagram [B], if the alarm option is selected), which issues a notification if
the signal strength of the light being received is not sufficient. Possible causes: Sensor
or reflector is contaminated, sensor is out of alignment. In the good state: LOW (U
if excessively contaminated: HIGH (>+U
Health output: The sensor (HL18(G/T)(L)) features a health status notification output
("Q2" in connection diagram [B], if the health option is selected), which issues a notifi‐
cation if the signal strength of the light being received is sufficient. Possible causes,
if the signal strength is not sufficient: Sensors are contaminated, sensors are out
of alignment, or cable is damaged. In the good state: HIGH (>+U
contaminated or in the event of cable interruption: LOW (U
flashes in this case.
Time types
Time types: HL18(G/T)(L) with optional On-delay or Off-Delay adjustment: t0 = no time
delay, t1 = time delay when object is detected, t2 = time delay when no object is
detected. The time setting can be selected using the potentiometer according to A.
Timer stages can be set from 0 to 2 seconds.
The Troubleshooting table indicates measures to be taken if the sensor stops working.
Table 10: Troubleshooting
LED indicator/fault pattern
Yellow LED does not light up
even though the light beam
is aligned to the reflector and
there is no object in the path of
the beam
Green LED flashes
Switching outputs not accord‐
ing to graphic C
Switching outputs not accord‐
ing to graphic C
Yellow LED flashes; if Health is
present then take note of the
corresponding output signal; if
Alarm is present then take note
of the corresponding output
signal
- V). The LED indicator flashes in this case.
V
Cause
No voltage or voltage below
the limit values
Voltage interruptions
Sensor is faulty
IO-Link communication
IO-Link communication
Parameter settings made
manually, which deviate from
the standard
Sensor is still ready for oper‐
ation, but the operating con‐
ditions are not ideal/addition‐
ally with health output: power
supply interrupted
< V);
V
- V); if excessively
V
< V). The LED indicator
V
Measures
Check the power supply,
check all electrical connec‐
tions (cables and plug connec‐
tions)
Ensure there is a stable power
supply without interruptions
If the power supply is OK,
replace the sensor
-
-
Initiate a factory reset. The
switching outputs are reset to
factory settings.
Check the operating condi‐
tions: Fully align the beam
of light (light spot) with the
reflector. / Clean the optical
surfaces (sensor and reflec‐
tor) / If the potentiometer is
set to the max. sensitivity:
Reduce the distance between
the sensor and the reflector,
and check the reflector type /
Reflector is not suitable for
8017290.1A15 / 2020-12-14 | SICK
Subject to change without notice