<12. Troubleshooting>
12-2
IM 11M12G01-02EN 1sh Edition : Mar. 25, 2021-00
Table 12.1 Types of Fault , Reasons for Occurrence
Alarm
Number
Type Occurrence Conditions
001 Hardware failure Occurs when internal storage hardware fails.
002 Internal com. failure This error occurs when there is an error in internal storage
communication.
003 MAC address read failure This error occurs when there is an error in MAC address being
read.
004 Converter user param.
failure
This error occurs when there is an error in reading converter
setup data.
016 Cell voltage failure Occurs when the cell (sensor) electromotive force input to
converter becomes less than -50 mV.
017 Heater temperature failure Occurs when temperature of the heater does not rise during
warm-up, or when the temperature drops below 730°C or rises
above 780°C after the warm-up.
Also, when the polarity of the thermocouple output (TC+, TC-)
from sensor is reversed.
018 A/D converter failure Occurs when an error occurs in A/D converters in the electric
circuitry of converter internal storage.
019 Sensor EEPROM failure This error occurs when writing to memories is not performed
normally in the electric circuitry of converter internal storage.
020 Sensor user param. failure This error occurs when reading sensor setup data is abnormal.
12.1.2 Remedies When Fault Occurs
(1) Alarm 016: Cell electromotive force error
This Fault occurs when the cell (sensor) voltage input to the converter falls below -50 mV
(corresponding to about 200 vol%O
2
). The following are considered to be the causes for the cell
voltage falling below -50 mV:
(1) Poor contact in terminal connections between the converter and detector
(2) Breakage in wiring cable between the converter and the detector
(3) Damage or deterioration of the sensor assembly
(4) Continuity failure between the sensor assembly electrode and the contact
(5) Wiring failure inside the detector
(6) Abnormality in electrical circuits in the converter
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