11
Troubleshooting
11.1
Warning messages
Table 17: Warning messages in the Diagnosis menu
Message
Possible causes
Measures
Analog input tempera‐
ture out of range
Input signal (0 ... 20 mA) of the temper‐
ature measurement is outside the config‐
ured limits, the system continues running
with the default temperature value.
Check the temperature sensor.
Check the cable connection.
Check the parameter settings:
see "Setting the signal: Upper out‐
Temperature low, no
humidity correction
Measured gas temperature is so low that
it is assumed the plant has been switched
off. This means the cross-sensitivity correc‐
tion for exhaust gas humidity is not per‐
formed.
No measures required when the plant is switched off
Check the parameter settings:
see "Setting the signal: Upper out‐
The switching point is at 70 °C or half the value of the
default temperature depending on which value is lower.
Check the temperature sensor.
Sensor low signal
Dust content too high (outside the calibra‐
tion data from project planning).
Observe the ambient conditions in the technical data.
Fog formation.
Optical surfaces contaminated.
Clean the optical interfaces.
Device disadjusted.
Check device alignment.
Lamp defective.
Check lamp, exchange when necessary.
Check for free light path through the duct.
If warning messages still occur after carrying out the
measures: New zero adjust.
Warming up
The required operating temperature is not
reached shortly after switching on. Dis‐
played measured values could be outside
the tolerance.
Observe warming up time of approx. 30 minutes.
Out of range
The measured value exceeds the specified
measuring range.
Set the measuring range to a higher value:
ing the measuring range", page 58
TROUBLESHOOTING
11
8008932/16YT/V4-0/2022-02 | SICK
O P E R A T I N G I N S T R U C T I O N S | GM901-02
79
Subject to change without notice
