Troubleshooting - SICK HTB18 Instrucciones De Operación

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Troubleshooting

8017850.16K9 | SICK
Subject to change without notice
Sensing range min.
100 %
0 %
Figure 6: Signal strength light bar during adjustment
The optimum setting can be achieved and checked using the signal strength light bar on
the back of the sensor. The LEDs on the signal strength light bar light up in relation to the
object position and the set switching point. If no LEDs or only the red LEDs light up, the
object is positioned behind the set switching point and cannot be detected. The first yellow
LED lights up when the object is in the set switching point. The green LEDs light up when
the object is between the sensor and the set switching point. The closer the object is to the
switching point, the more green LEDs will light up
ready for operation. Refer to graphics
switching output fails to behave in accordance the graphic, check application conditions.
See section Fault diagnosis.
The sensor is adjusted and ready for operation.
4 Alarm output
The sensor (HTB18(L)) features a pre-failure notification output ("Q2" in connection dia‐
gram [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 is contaminated, sen‐
sor is out of alignment. In the good state: LOW (U
(>+U - V). The LED indicator flashes in this case.
V
Health output: The sensor (HTB18(L)) features a health status notification output ("Q2" in
connection diagram [B], if the health option is selected), which issues a notification 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
event of cable interruption: LOW (U
Time types: HTB18(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 object and the
object is within the set sensing
range
Set switching point
100 % 100 % 100 % 100 % 100 %
0 % 0 % 0 %
0 % 0 %
(see figure
see table 1, page 7
< V); if excessively contaminated: HIGH
V
- V); if excessively contaminated or in the
V
< V). The LED indicator flashes in this case.
V
Cause
No voltage or voltage below
the limit values
Voltage interruptions
Sensor is faulty
TROUBLESHOOTING
Sensing range max.
100 %
0 %
6). The sensor is adjusted and
to check the function. If the
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
8
100 %
0 %
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