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< 12. Troubleshooting >
12-1
IM 11M12D01-01E
12. Troubleshooting
This chapter describes errors and alarms detected by the self-diagnostics function of the averaging
converter. It also explains inspections and remedies when other problems occur.
12.1 Displays and Remedies When Errors Occur
12.1.1 Error Types
An error occurs when an abnormality is detected in the detector or averaging converter, e.g., in the cell
(sensor), detector heater, or internal circuits of the averaging converter.
An error (message and error contact) will not be canceled even after the cause of the error has been
removed. Follow the procedure below to cancel an error.
An individual channel error can be canceled by using the hot swap function, i.e., by turning off/on the
power to the channel where the error is occurring. A system error can be canceled by turning off/on
the main power. There are five types of errors as shown in the table below.
Table 12.1 Error Types and Occurrence Conditions
Error
Code
Error Type Occurrence Conditions
Unit to be
detected
Error 1 Cell voltage failure Cell (sensor) voltage signal input to the converter falls
below -50 mV for 1.5 seconds or longer continuously.
Each channel
Error 2 Heater temperature
failure
1) Heater temperature rise during warm-up is not more than 5°C
per 5 minutes.
2) Heater temperature during warm-up exceeds 780°C for
1.5 seconds or longer continuously.
3) After warm-up, heater temperature falls below 730°C or
exceeds 780°C for 10 seconds or longer continuously.
Each channel
Error 3 Channel card failure 1) Failure is detected by memory check.
2) Communication failure occurs between card and A/D converter.
Each channel
Error 4 Control card failure Failure is detected by memory check System
Error 5 Inter-card
communication failure
Communication failure occurs between control card and each
channel.
Each channel
12.1.2 Operations When an Error Occurs
When an error occurs, the averaging converter operates as follows.
When a channel-specific error occurs:
1) The power to the heater of the corresponding detector is removed.
2) On the multi-channel display, a red error code is indicated under the relevant channel and an
error icon flashes in the switch indication area (Figure 12.1).
3) On the single-channel display, a large error code is indicated in the oxygen concentration data
area and an error icon flashes in the switch indication area if the display shows the relevant
channel (Figure 12.2). If not, only a flashing error icon is indicated.
4) The relevant channel is dropped out of the averaging group. The averaging outputs continue
with exception of the channel.
5) The corresponding individual analog output is put into the status specified in the [Output hold
setup] display. No other individual analog outputs are affected.
6) The red lamp turns on in the status display lamp on the relevant channel.
7) The individual error contact and common error contact are activated.