Emerson Rosemount, Справочное руководство

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137
Reference Manual
00809-0100-4021, Rev GC
Section 3: HART commissioning
April 2014
HART® commissioning
3.16.2 LCD display
The LCD displays abbreviated diagnostic messages for troubleshooting the transmitter. To
accommodate two word messages, the display alternates between the first and second word.
Some diagnostic messages have a higher priority than others, so messages appear according to
priority, with normal operating messages appearing last. Messages on the
Process Variable line
refer to general device conditions, while messages on the Process Variable Unit line refer to
specific causes for these conditions. A description of each diagnostic message follows.
Table 3-4. LCD Display Error Warning Descriptions
Message Description
[BLANK] If the meter does not appear to function, make sure the transmitter is configured for the meter
option you desire. The meter will not function if the LCD Display option is set to Not Used.
FAIL -or- HDWR FAIL This message indicates one of several conditions including:
The transmitter has experienced an electronics module failure.
The transmitter self-test has failed.
If diagnostics indicate a failure of the electronics module, replace the electronics module with a
new one. Contact the nearest Emerson Process Management Field Service Center if necessary.
SNSR 1 FAIL -or-
SNSR 2 FAIL
The transmitter has detected an open or shorted sensor condition. The sensor(s) might be
disconnected, connected improperly, or malfunctioning. Check the sensor connections and
sensor continuity.
SNSR 1 SAT -or-
SNSR 2 SAT
The temperature sensed by the transmitter exceeds the sensor limits for this particular sensor
type.
HOUSG SAT The transmitter operating temperature limits (–40 to 185 °F (40 to 85 °C)) have been exceeded.
LOOP FIXED During a loop test or a 4–20 mA output trim, the analog output defaults to a fixed value. The
Process Variable line of the display alternates between the amount of current selected in
milliamperes and “WARN.” The Process Variable Unit line toggles between “LOOP,” “FIXED,” and
the amount of current selected in milliamperes.
OFLOW The location of the decimal point, as configured in the meter setup, is not compatible with the
value to be displayed by the meter. For example, if the meter is measuring a process temperature
greater than 9.9999 degrees, and the meter decimal point is set to 4 digit precision, the meter will
display an “OFLOW” message because it is only capable of displaying a maximum value of 9.9999
when set to 4 digit precision.
HOT BU Hot Backup is enabled and Sensor 1 has failed. This message is displayed on the Process Variable
line and is always accompanied by a more descriptive message on the Process Variable Unit line. In
the case of a Sensor 1 failure with Hot Backup enabled, for example, the Process Variable line
displays “HOT BU,” and the Process Variable Unit line alternates between “SNSR 1” and “FAIL.”
WARN DRIFT ALERT Drift Alert warning is enabled and the difference between Sensor 1 and Sensor 2 has exceeded the
user-specified limit. One of the sensors may be malfunctioning. The Process Variable line displays
“WARN” and the Process Variable Unit line alternates between “DRIFT” and “ALERT.”
ALARM DRIFT ALERT The analog output is in alarm. Drift Alert alarm is enabled and the difference between Sensor 1
and Sensor 2 has exceeded the user-specified limit. The transmitter is still operating, but one of
the sensors may be malfunctioning. The Process Variable line displays “ALARM” and the Process
Variable Unit line alternates between “DRIFT” and “ALERT.”
ALARM The digital and analog outputs are in alarm. Possible causes of this condition include, but are not
limited to, an electronics failure or an open sensor. This message is displayed on the Process
Variable line and is always accompanied by a more descriptive message on the Process Variable
Unit line. In the case of a Sensor 1 failure, for example, the Process Variable line displays “ALARM,”
and the Process Variable Unit line alternates between “SNSR 1” and “FAIL.”
WARN The transmitter is still operating, but something is not correct. Possible causes of this condition
include, but are not limited to, an out-of-range sensor, a fixed loop, or an open sensor condition.
In the case of a Sensor 2 failure with Hot Backup enabled, the Process Variable line displays
“WARN,” and the Process Variable Unit line alternates between “SNSR 2” and “RANGE.”