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Emerson Rosemount 644h Handbuch Seite 35

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4-7
EN
Rosemount Inc
LCD Meter
In addition to the output, the LCD meter displays abbreviated diagnostic
messages for troubleshooting the transmitter. To determine the cause of a
message, use a Model 275 HART Communicator to further interrogate the
transmitter. A description of each diagnostic message is identified in Table 4-4.
The device sometimes requires additional interrogation to determine the source of
the warning. Contact Rosemount Customer Central at (800) 999-9307 or your local
Rosemount support center for further information.
TABLE 4-4. LCD Meter Diagnostics
Alarm Description
DEV FAIL The top line of the display scrolls through the following three messages:
•“BAD”
•“DEV”
•“FAIL”
This message indicates one of several conditions. For example, the transmitter
may have experienced an electronics failure while attempting to store information.
If diagnostics indicate an electronics failure, replace the transmitter with a new
one. Contact the nearest Rosemount Field service Center if necessary.
SNSR
FAIL
The top line of the display scrolls through the following three messages:
•“BAD”
•“SNSR”
•“FAIL”
The bottom line display s the name of the sensor that has failed. This message
indicates that the transmitter has detected an open or shorted sensor condition.
The sensor may be disconnected, connected improperly, or malfunctioning.
Check the sensor connections and sensor continuity.
UNCRN The top line of the display alternates between “UNCRN” and the sensor value.
The bottom line will display the name of the sensor for which this message
applies. The uncertain message is displayed when the sensor reading is outside
of the acceptable temperature range for the particular sensor type.
FIXED Duringalooptestoraa4–20 mA output trim, the analog output defaults to a fixed
value. The top line of the display alternates between “FIXED” and the amount of
current selected in milliamperes. The bottom line will hold on “AO mA.”
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