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< 12. Troubleshooting >
12-4
IM 11M12D01-01E
2) Error 2: Heater Temperature Failure
<Possible causes of heater temperature failure>
This error occurs if the detector heater temperature does not rise during warm-up, falls below 730°C
after warm-up, or exceeds 780°C. When Error 2 occurs, Alarm 5 (cold junction temperature alarm)
may be generated at the same time. Be sure to touch the error icon to get the error description and
confirm whether or not this alarm is being generated simultaneously.
If Alarm 5 is generated simultaneously, a failure in the cold junction system on the detector terminal
block is suspected. In this case follow the procedure according to troubleshooting for Alarm 5 in
Subsection 12.2.3.
The following are possible causes of Error 2 when it occurs independently.
1) Fuse for the heater on the power supply unit has blown.
2) Failure in wiring between the averaging converter and the detector (e.g., loose connection at
terminals, wire breakage, short-circuit).
3) Faulty cold junction compensation sensor on the detector terminal block (loose connection at
terminals).
4) Faulty thermocouple in the detector (wire breakage, short-circuit in internal wiring).
5) Faulty heater in the detector (wire breakage, etc.).
6) Failure in electrical circuits inside the averaging converter.
<Locating cause of failure, and Countermeasures>
1) Turn off power to the channel with error by how swap function or to the averaging converter.
2) Remove the cable from terminals 7 and 8 of the detector and measure the resistance between
these terminals. The heater unit is normal if the resistance is lower than about 90 Ω. If the
resistance value is higher, failure of the heater unit is suspected. In this case, replace the heater
unit (refer to Subsection 11.3.4, “Replacement of the Heater Unit”). In addition, check that the
two-way wiring resistance between the converter and the detector is 10 Ω or less.
3) Remove the wiring from terminals 3 and 4 of the detector and measure the resistance between
these terminals. The thermocouple is considered normal if the resistance value is 5 Ω or less. If
the value is higher than 5 Ω, it may indicate that the thermocouple wire has broken or is about
to break. In this case, replace the heater unit (refer to Subsection 11.3.4). Also, check that the
wiring resistance between the converter and the detector is 10 Ω or less.
NOTE
Measure the thermocouple resistance value after the temperature difference between the detector
tip and the ambient atmosphere has decreased to 50°C or less. If the thermocouple voltage is large,
accurate measurement cannot be achieved.
3) Error 3: Cannel Card Failure
This indicates that the channel card with an error has failed to operate properly. Replace the channel
card. Before replacing the channel card, be sure to turn off power to the channel card to be replaced
by hot swap function.
4) Error 4: Control Card Failure
This indicates that the control card has failed to operate properly. Contact our service office.
5) Error 5: Inter-card Communication Failure
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