User's Guide ______________________________________________________________________
262 _________________________________________________________________ M210667EN-C
PWD Sensor: OK
LM Sensor: OK
Background luminance sensor: OK
Current Events:
A2:MOR; MOR overrange
A3:AutoCal: autocalsituation
An event is defined as a noticeable situation detected by the LT31 system
by sub-unit answers or internal algorithms. Each event or a combination
of events have characteristics information, warning, alarm, or error.
Table 36 below summarises all possible events to identify the current
LT31 system status easily.
Table 36
Events
Event Message
Probable Cause
Remedy
A1:MOR; MOR
underrange
MOR value is below lower MOR
measurement range limit.
Normal operation.
A2:MOR; MOR
overrange
MOR value is above upper MOR
measurement range limit.
Normal operation.
A3:AutoCal:
autocalsituation
Preconditions for auto-calibration
are valid. A new auto-calibration
factor is build.
Normal operation.
A4:AutoCal; autocal
error
Current auto-calibration factor is
out of range.
Reset LT31 system (refer to Table 11 on
page 150) and perform an Offset and
Visibility Calibration (see section Offset and
Visibility Calibration on page 234).
A5:Window
Contamination
Measurement;
contamination level 1
Measured window contamination
has reached level 1 threshold.
Cleaning of optical surfaces within mid-term
range (see section Cleaning Instructions on
page 194). LT31 system is able to cope this
situation.
A6:Window
Contamination
Measurement;
contamination level 2
Measured window contamination
has reached level 2 threshold.
Cleaning of optical surfaces within short-
term range (see section Cleaning
Instructions on page 194). LT31 system is
able to cope this situation.