Rosemount 8732 Series, Reference Manual

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Reference Manual
00809-0100-4663, Rev BA
January 2010
6-3
Rosemount 8732
DIAGNOSTIC
MESSAGES
Problems in the magnetic flowmeter system are usually indicated by incorrect
output readings from the system, error messages, or failed tests. Consider all
sources in identifying a problem in your system.
Table 6-1. Rosemount 8732 Basic Diagnostic Messages
Message Potential Cause Corrective Action
“Fieldbus Not
Communicating”
Fieldbus segment is disconnected Connect the fieldbus segment
Fieldbus segment power missing Verify the segment fieldbus voltage
Electronics failure Replace electronics
“Sensor Processor Not
Communicating”
Transmitter input power (AC/DC) is
not connected Connect the input power. If the LCD displays a message, the input power is
applied
Electronics failure Replace electronics
“Empty Pipe” Empty Pipe None - message will clear when pipe is full
Wiring Error Check that wiring matches appropriate wiring diagrams - see Appendix E:
Universal Sensor Wiring Diagrams
Electrode Error Perform sensor tests C and D (see Table 6-5 on page 6-8)
Conductivity less than 5
microsiemens per cm Increase Conductivity to greater than or equal to 5 microsiemens per cm
Intermittent Diagnostic Adjust tuning of Empty Pipe parameters
“Coil Open Circuit” Improper wiring Check coil drive wiring and sensor coils
Perform sensor test A - Sensor Coil
Other manufacturer’s sensor Change coil current to 75 mA
Perform a Universal Auto Trim to select the proper coil current
Circuit Board Failure Replace Rosemount 8732 Electronics
Coil Circuit OPEN Fuse Return to factory for fuse replacement
“Auto Zero Failure”
(Cycle power to clear
messages, no changes
were made)
Flow is not set to zero Force flow to zero, perform autozero
Unshielded cable in use Change wire to shielded cable
Moisture problems See moisture problems in “Accuracy Section”
Empty pipe is present Fill sensor with process fluid
“Universal Trim Failure” No flow in pipe while performing
Universal Auto Trim Establish a known flow in sensor, and perform Universal Auto-Trim
calibration
Wiring error Check that wiring matches appropriate wiring diagrams - see “Universal
Sensor Wiring Diagrams” on page E-1
Flow rate is changing in pipe while
performing Universal Auto-Trim
routine Establish a constant flow in sensor, and perform Universal Auto-Trim
calibration
Flow rate through sensor is
significantly different than value
entered during Universal Auto-Trim
routine Verify flow in sensor and perform Universal Auto-Trim calibration
Incorrect calibration number
entered into transmitter for
Universal Auto-Trim routine Replace sensor calibration number with 1000005010000001
Wrong sensor size selected Correct sensor size setting - See “Line Size” on page 3-9
Sensor failure Perform sensor tests C and D (see Table 6-5 on page 6-8)
“Electronics Failure” Electronics self check failure Replace Electronics
“Electronics Temp Fail” Ambient temperature exceeded the
electronics temperature limits Move transmitter to a location with an ambient temperature range of -40 to
165 °F (-40 to 74 °C)
“Reverse Flow” Electrode or coil wires reverse Verify wiring between sensor and transmitter
Flow is reverse Turn ON Reverse Flow Enable to read flow
Sensor installed backwards Re-install sensor correctly, or switch either the electrode wires (18 and 19)
or the coil wires (1 and 2)
“Flow Rate > Sensor Limit” Flow rate is greater than 43 ft/sec Lower flow velocity, increase pipe diameter
Improper wiring Check coil drive wiring and sensor coils
Perform sensor test A - Sensor Coil (see Table 6-5 on page 6-8)
“Digital Trim Failure”
(Cycle power to clear
messages, no changes
were made)
The calibrator (8714B/C/D) is not
connected properly Review calibrator connections
Incorrect calibration number
entered into transmitter Replace sensor calibration number with 1000005010000001
Calibrator is not set to 30 FPS Change calibrator setting to 30 FPS
Bad calibrator Replace calibrator