Yokogawa Integral Oxygen Analyzer ZR202 - Manual (Page 171)

<12. Troubleshooting>
12-1
IM 11M12A01-02E 8th Edition : Jan.13,2012-00
12. Troubleshooting
This chapter describes errors and alarms detected by the self-diagnostic function of the
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 the converter, e.g., in the cell
(sensor), detector heater, or internal circuits of the the converter..
If an error occurs, the converter performs the following:
(1) Stops the supply of power to the heater in the detector to insure system safety.
(2) Causes an error indication in the display to start blinking to notify of an error generation
(Figure 12.1).
(3) Sends an output contact if the error is set up for Output contact setup for that contact
(refer to Section 8.4, Output Contact Setup).
(4) Changes the analog output status to the one set in Output hold setting.
(refer to Section 8.2, Output Hold Setting).
When the display shown in Figure 12.1 appears, pressing the error indication brings up a
description of the error (Figure 12.2). The content of errors that are displayed include those
shown in Table 12.1.
Tag:
21.0
%O
2
17.42mA -Output1
17.42mA -Output2
Hold
F12.1E.ai
Tag:
Error 2 :Heater temp.
Alarm 1 1 : T.C. voltage
Hold
F12.2E.ai
Figure 12.1 Figure 12.2
Table 12.1 Types of Errors and Reasons for Occurrence
Error Code Error Type Occurrence Conditions
Error1 Cell voltage failure The cell (sensor) voltage signal input to the converter falls below -50 mV.
Error2 Heater temperature failure The heater temperature does not rise during failure warm-up, or it falls
below 730 ºC or exceeds 780 ºC after warm-up is completed.
Or this occurs if the TC+, TC- thermocouple terminals are wired to
converter with reverse (wrong) polarity.
Error3 A/D converter failure The A/D converter fails in the internal electrical circuit in the converter.
Error4 Memory failure Data properly are not written into memory in the internal electrical circuit
in the converter.