Yokogawa Integral Oxygen Analyzer ZR202 - Manual (Page 140)

<12. Troubleshooting>
12-1
IM 11M12A01-04E
12. Troubleshooting
This chapter describes errors and alarms detected by the self-diagnostic function of the converter.
This chapter also describes the check and restoration methods to use when problems other than the
above occur.
12.1 Displays and Measures to Take When Errors
Occur
12.1.1 What is an Error?
An error is detected if any abnormality is generated in the detector or the converter, e.g., in the cell
(sensor) or heater in the detector, or the internal circuits in 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 8.5, “Output Contact Setup”).
(4) Changes the analog output status to the one set in “Output hold setting” (refer to Section 8.3,
“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.
Displayed alternately
Err-01 ---------
F12.1E.ai
Figure 12.1
Table 12.1 Types of Errors and Reasons for Occurrence
Error Type of error Reason for Occurrence
Error-1 Cell voltage failure The cell (sensor) voltage signal input to the converter
falls below -50 mV.
Error-2 Heater temperature failure The heater temperature does not rise during warm-
up, or it falls below 730 °C or exceeds 780 °C after
warm-up is completed.
Error-3 A/D converter failure The A/D converter fails in the internal electrical circuit
in the converter.
Error-4 Memory failure Data properly are not written into memory in the
internal electrical circuit in the converter.