Troubleshooting - SICK HTF18 Instrucciones De Operación

8

TROUBLESHOOTING

8 Troubleshooting
18
3 Sensing range setting
Sensor which it is not possible to set: The sensor is adjusted and ready for operation.
Refer to graphic to check the function. If the switching output fails to behave in accordance
with graphic, check application conditions. See section Fault diagnosis.
Sensor with potentiometer:
The sensing range is adjusted relative to the background with the potentiometer (type:
270°).
Clockwise rotation: sensing range increased; counterclockwise rotation: sensing range
reduced.
Turn the potentiometer clockwise until the yellow LED indicator lights up. When an object is
moved into the path of the beam, the yellow LED indicator must go out. If the yellow LED
indicator remains lit when an object is moved into the path of the beam, repeat the adjust‐
ment.
Sensing range min.
100 %
0 %
Figure 5: 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 in front of the set switching point and cannot be detected. The first yel‐
low LED lights up when the object is behind the set switching point. More green LEDs light
up when the object is moved further away from the sensor into the background
figure 5). The sensor is adjusted and ready for operation. Refer to graphics
page 7 to check the function. If the 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 (HTF18(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 (HTF18(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: HTF18(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.
Set switching point
100 % 100 % 100 % 100 % 100 %
0 % 0 % 0 %
0 % 0 %
< V); if excessively contaminated: HIGH
V
- V); if excessively contaminated or in the
V
< V). The LED indicator flashes in this case.
V
Sensing range max.
100 % 100 %
0 % 0 %
(see
see table 1,
8017858.16K9 | SICK
Subject to change without notice