YOKOGAWA YTA710, User Manual

Page: 28 / 44

<4. Self-Diagnostics>
4-3
IM 01C50T03-02EN
Indicator
display
BRAIN configuration
tool display
Cause
Output operation
upon error
Action
AL.23 Backup S1 Fail Sensor1 has failed during
sensor backup, and the Sensor2
data is output.
Output the backup side
data. If the backup side
sensor has also failed,
data is output by the
burnout setting.
Check the soundness of
Sensor1.
AL.24 Backup S2 Fail Sensor2 has failed during
sensor backup.
Normal operation Check the soundness of
Sensor2.
AL.25 Sensor Drift Sensor drift Normal operation Check the soundness of
the sensor.
AL.26 S1 Temp Cycle Temperature cycle count of
Sensor1 has exceeded the
threshold.
Normal operation Reset the temperature
cycle count.
AL.27 S2 Temp Cycle Temperature cycle count of
Sensor2 has exceeded the
threshold.
Normal operation Reset the temperature
cycle count.
AL.30 Output Too Low The PV value has dropped
below the lower limit.
Lower limit: 3.68 mA
(-2%)
Check and correct the
lower limit setting.
AL.31 Output Too High The PV value has exceeded the
upper limit.
Upper limit: 20.8 mA
(105%)
Check and correct the
upper limit setting.
AL.40 S1 Temp Low The measurement temperature
of Sensor1 is too low.
Normal operation Check the sensor type.
AL.41 S1 Temp High The measurement temperature
of Sensor1 is too high.
Normal operation
AL.42 S2 Temp Low The measurement temperature
of Sensor2 is too low.
Normal operation
AL.43 S2 Temp High The measurement temperature
of Sensor2 is too high.
Normal operation
AL.44 Amb Temp Low The ambient temperature is
below -40°C.
Normal operation Increase the ambient
temperature using
a heater, or use the
transmitter in a place
where the ambient
temperature is high.
AL.45 Amb Temp High The ambient temperature is
above 85°C.
Normal operation Place the transmitter
away from the heat
source.
AL.50 LRV Too Low The LRV has been set below
the temperature range of sensor
specifications.
Normal operation Check and correct the
lower limit setting.
AL.51 LRV Too High The LRV has been set above
the temperature range of sensor
specifications.
Normal operation
AL.52 URV Too Low The URV has been set below
the temperature range of sensor
specifications.
Normal operation Check and correct the
upper limit setting.
AL.53 URV Too High The URV has been set above
the temperature range of sensor
specifications.
Normal operation
AL.54 Span Too Small The span has been set below
the recommended minimum
span.
Normal operation Check and correct the
upper and lower limit
settings.
AL.60 Illegal PV Cfg The sensor (or sensor value)
mapped to PV has been set
incorrectly.
Hold to the output upon
error. 4-mA current is
output if it occurred
during startup.
Check the PV mapping.
AL.61 Reserved Reserved
AL.62 Reserved Reserved
AL.70 Output Man Mode Forced Output mode has been
selected.
The set value of Forced
Output mode
Set to the normal mode.