Identifying And Correcting Fault Indications - Emerson Rosemount Xi Reference Manual

Troubleshoot
October 2022
5.4

Identifying and correcting fault indications

There are two types of alarms: recoverable and non-recoverable. If an existing alarm is
recoverable, the alarm-active indication disappears when the alarm condition no longer
exists. If an alarm is not recoverable, the alarm indication continues to be displayed after
the cause of the alarm condition is corrected. AC power to the transmitter must be cycled
to clear a non-recoverable alarm.
Alarm messages are displayed on the Rosemount 910Xi display window when the alarm
status display is accessed via the Rosemount 910Xi menu. A listing of the alarm/fault
messages and the related fault status descriptions are shown in
Fault conditions that give no fault indication and that allow the probe to pass calibration
are listed and discussed after
Table 5-1: Diagnostic/Unit Alarm Fault Definitions
Message Status
NV Memory A checksum error was detected in the
Fail nonvolatile memory configuration data when
the unit was turned on.
Factory Mode On Rosemount Xi box I/O board, SW4, position
1 is set on ON. On transmitter electronics board,
SW1, position 1 is set to ON. This setting should
only be used in the factory.
Board Temp The transmitter electronic board reading is
High above 259 °F (126 °C) or the Rosemount Xi unit
I/O board temperature reading is above 187 °F
(86 °C).
O2 Htr Ramp The O sensor heater ramp rate is greater than
2
Rate the max allowed ramp rate, indicating a run
away heater condition.
O2 Sensor The cell impedance voltage is reading less than
Open -1.1 Vdc, indicating the O
disconnected or the O
open.
O2 TC Open The O cell heater thermocouple voltage is
2
reading more than the hardware configured
threshold voltage. This indicates the
thermocouple wires may be disconnected of the
thermocouple junction may be open.
O2 Temp Low The heater temperature is below the minimum
temperature. The predefined low temperature
threshold is 1339 °F (726 °C).
O2 Temp High The heater temperature is above the defined
temperature threshold. The high temperature
threshold is defined by the High Alarm SP
parameter. The default value is 1382 °F (750 °C).
O2 T/C The O sensor heater temperature
2
Shorted thermocouple voltage is shorted.
54
Table 5-1.
sensor wires may be
2
sensor junction may be
2
Table
Alert Self clearing
Failed No
No
Failed No
No
Maint Yes
Maint Yes
Maint Yes
Maint Yes
Maint Yes
Reference Manual
00809-0100-4889
5-1.
Rail A out
Yes
Yes
Yes
Yes
Yes
Yes
Rosemount Xi