171
Reference Manual
00809-0300-4750, Rev CA
March 2016
Output at alarm
level
•Electronics failure
•Cycle power. If alarm is still present, verify transmitter operation
with an 8714 D Calibration Standard or replace the electronics
stack.
•Open coil circuit
•Check coil drive circuit connections at the sensor and at the
transmitter.
•Analog output diagnostic alarm
is active
•See
“AO diagnostic alarm” on page 87
•Coil power or coil current is over
limit
•Check coil drive circuit connections at the sensor and at the
transmitter.
•Cycle power. If alarm is still present, verify transmitter operation
with an 8714 D Calibration Standard or replace the electronics
stack.
•Connected to incompatible
sensor
•See
“Implementing a Universal Transmitter” on page 221
Pulse output at
zero, regardless
of flow
•Wiring error
•Check pulse output wiring at terminals 3 and 4. Refer to wiring
diagram for pulse counter and pulse output. See
•PZR activated
•Remove signal at terminals 5 and 6 to deactivate the PZR.
•No power to transmitter
•Check pulse output wiring at terminals 3 and 4. Refer to wiring
diagram for pulse counter and pulse output.
•Power the transmitter.
•Reverse flow
•Enable Reverse Flow function.
•Electronics failure
•Verify transmitter operation with an 8714D Calibration
Standard or replace the electronics stack.
•Pulse output incorrectly
configured
•Review configuration and correct as necessary.
Communication
problems with
the Field
Communicator
•4–20 mA output configuration
•Check analog power switch (internal/external). The Field
Communicator requires a 4–20 mA output to function.
•Communication interface wiring
problems
•Incorrect load resistance (250
Ohm
minimum, 600 Ohm
maximum);check appropriate wiring diagram.
•Low batteries in the Field
Communicator
•Replace the batteries in the Field Communicator – see the
communicator manual for instructions.
•Old revision of software in the
Field Communicator
•Consult your Emerson Process Management representative
about updating to the latest revision of software.
Error Messages
on LOI or Field
Communicator
•Many possible causes depending
upon the message
•See
, and
for the LOI or Field Communicator messages.
Discrete input
does not
register
•Input signal does not provide
enough counts
•Verify the discrete input provided meets the requirements in
“Connect discrete output” on page 44
.
•Perform a loop test to validate the analog control loop.
•Perform a D/A trim. This allows the calibration of the analog
output with an external reference at operating endpoints of the
analog output.
Table 9-7. Common Magmeter Issues
Symptom
Potential cause
Corrective action
Содержание Rosemount 8750W
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