Advanced Troubleshooting; Diagnostic Messages - Emerson Rosemount 8600 Series Reference Manual

Reference Manual
May 2019
Symptom
Flow in Pipe, No Output
5.3

Advanced troubleshooting

The Rosemount 8600D electronics provides several advanced troubleshooting features.
These features enhance your ability to look inside the electronics and can be helpful for
troubleshooting inaccurate readings. As shown in
located on the electronics.
5.3.1

Diagnostic messages

The following is a list of messages used by the Field Communicator and their corresponding
descriptions.
Table 5-1. Diagnostic Messages
Message
ROM CHECKSUM ERROR
NV MEM CHECKSUM ERROR
RAM TEST ERROR
Rosemount 8600 Vortex Flow Meter
Basics
• Check to make the sure that the meter is
installed with the arrow in the direction of
process flow.
• Perform basic checks for Incorrect 4–20 mA
Output Problem (see Incorrect 4–20 mA
Output).
• Check and correct configuration parameters
in this order:
• Process Config - transmitter mode, process
fluid, fixed process temperature,
density/density ratio (if required), reference
K-factor, flange type, mating pipe ID, variable
mapping, PV unit, range values - (URV, LRV),
PV damping, auto filter adjust, pulse mode
and scaling (if used).
• Check sizing. Make sure flow is within
measurable flow limits. Use Instrument
Toolkit for best sizing results.
• Refer to "Advanced troubleshooting" on
page 67.
• See Appendix Appendix C Electronics
Verification for electronics verification
procedure.
Electronics
• Run a self test with a HART-based interface
tool.
• Using sensor simulator, apply test signal.
• Check configuration, LFC, trigger level, STD vs.
actual flow units.
• Replace electronics.
Description
The EPROM memory checksum test has failed. The transmitter will remain in ALARM
until the ROM checksum test passes.
The User Configuration area in Nonvolatile EEPROM memory has failed the
checksum test. It is possible to repair this checksum by verifying and reconfiguring
ALL transmitter parameters. The transmitter will remain in ALARM until the EEPROM
checksum test passes.
Transmitter RAM memory test has detected a failed RAM location. The transmitter
will remain in ALARM until the RAM test passes.
Corrective action
Application Problems
• Calculate expected frequency (see
Appendix Appendix C Electronics
Verification). If actual frequency is the
same, check configuration.
• Check that application meets viscosity and
specific gravity requirements for the line
size.
• Recalculate back pressure requirement. If
necessary and possible, increase back
pressure, flow rate, or operating pressure.
Sensor
• Inspect coaxial sensor cable for cracks.
Replace if necessary.
• Check that sensor impedance at process
temperature is > 1 Mega-Ohm (will
function down to 0.5 Mega-Ohms).
Replace sensor if necessary
the sensor" on page
• Measure sensor capacitance at SMA
connector (115-700pF).
Figure 5-1, there are several test points
Troubleshooting
00809-0100-4860, Rev BF
("Replacing
78).
67