Yokogawa Single Channel Oxygen Analyzer System ZR22/ZR402 - Manual (Page 185)

IM 11M12A01-03E 12-1
12. Troubleshooting
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 8.4, “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:
0.0
%H 2 O
4.00mA -Output1
4.00mA -Output2
Hold
F12.1E.EPS
Tag:
Error 2 :Heater temp.
Alarm 1 1 : T.C. voltage
Hold
F12.2E.EPS
Figure 12.1 Figure 12.2
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 The heater temperature does not rise during
failure warm-up, or it falls below 730
ЊC or exceeds
780
ЊC after warm-up is completed.
Or this occurs if the TC+ TC- thermocouple
terminals are wired to converter with reverse
(wrong) polarity.
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.
T12.1E.EPS