Emerson Rosemount 8600D Series - Advanced Troubleshooting; Diagnostic Messages

69
Reference Manual
00809-0100-4860, Rev BC
Section 5: Troubleshooting
January 2013
Troubleshooting
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 troubleshoot-
ing inaccurate readings. As shown in Figure 5-1, there are several test points 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.
Flow in Pipe, No Output 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 69.
• 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.
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 (
“Replacing the sensor” on
page 80
).
• Measure sensor capacitance at SMA
connector (115-700pF).
Symptom Corrective Action
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