Manual

<7.InspectionandMaintenance>
7-2
IM 11M10B01-01E
7.2.1 InspectionintheEventofanAlarm(ALM)
Ifanerrorisdetectedbytheself-diagnosisfunctionoftheOX400duringoperation,theERR/ALM
lampashesandanalarm(ALM)codeisdisplayedonthesub-display.Ifanerrorisdetected,take
action according to the Table 7.1.
Table7.1 Alarm(ALM)ConditionsandActions
Display Content Diagnosis Condition Action
ALM1 Unstable heater
temperature
The heater temperature changed by ±5°C or
more from the standard temperature.
Check to make sure the
sensorgasowrateor
power supply is not unstable
ALM2 Sensor error The sensor electromotive force during
calibration became greater than ±30% relative
to the standard.
Check the calibration gas O
2
concentration value
Re-calibrate
Replace the sensor
ALM3 Electromotive force error A sensor electromotive force error of ±15 to
±30% relative to the standard occurred during
calibration.
Check the calibration gas O
2
concentration value
Re-calibrate
Replace the sensor
ALM4 Asymmetric voltage error The air electromotive force became greater than
±10 mV during calibration.
Calibration up to ±30 mV is possible.
Calibration beyond ±30 mV is not possible.
Check the air concentration
Re-calibrate
Replace the sensor
ALM5 Calibration error
Thecalibrationcoefcientbecamegreaterthan
thespeciedvalues(zero:±50,span:1±0.2).
When zero is ±50 to ±75 and span is 1±0.2 to
1±0.4, calibration is possible
Whenzeroexceeds±75andspanexceeds1
±0.4, calibration is not possible
Check the calibration gas O
2
concentration
Re-calibrate
Replace the sensor
ALM6 Sensor resistance value
error
The sensor impedance (cell resistance value)
becamegreaterthan1kΩduringcalibration.
Prepare a replacement
sensor
ALM7
Oxygenconcentration
high/lowlimiterror
Theoxygenconcentrationbecamelargerthan
thehigh/lowlimits.
Changethehigh/lowlimits
as needed
ALM8 Over range error
Theoxygenconcentrationbecamegreaterthan
100%FS, or became a negative value.
Change the range
Re-calibrate
7.2.2 InspectionintheEventofanError(ERR)
Ifanerrorisdetectedduringoperation,theERR/ALMlampturnsonandanerror(ERR)codeis
displayed on the sub-display. If an error is detected, take action according to Table 7.2.
Table7.2 Error(ERR)ConditionsandActions
Display Factor Diagnosis Condition Action
Err1 Sensor failure Sensor burnout. The sensor
electromotive force became
less than -50 mV.
Replace the sensor
Err2 Heater temperature error The heater temperature
became greater by ±30°C
relative to the standard
temperature.
Replace the heater
Checkthetemperatureadjustmentcircuit
(Contact our service department)
Err3 Temperature sensor burnout The temperature sensor has
burned out.
Replace the heater
(Contact our service department)
Err4 OX400 temperature error The temperature inside the
OX400 became greater
than 70°C.
Check to make sure the ventilation holes,
cooling fan outlet, and line are not blocked,
lines are not blocked, and so on.
Turn the power off and then on.
Err5 CPU failure A CPU failure occurred. Contact our service department.
Err6 Fan stop The cooling fan stopped. Contact our service department.