Reference Manual
00809-0100-4004, Rev BA
August 2010
Rosemount 8800D
5-4
LOW FLOW CUTOFF OVERRANGE On start-up, the configured setting for the VDSP Low Flow Cutoff
setting was found to be too high or too low. The increase range or
decrease no flow noise command of the VDSP Low Flow Cutoff
setting has not yet brought the setting into a valid range. Continue
adjusting the Low Flow Cutoff to a valid value or use the Filter
Restore Option.
T/C A/D ERROR The ASIC responsible for the analog to digital conversion of the
process temperature thermocouple and cold junction RTD has failed.
If the problem persists, replace the transmitter electronics.
THERMOCOUPLE OPEN The thermocouple that is used to measure the process temperature
has failed. Check the connections to the transmitter electronics. If the
problem persists, replace the thermocouple.
CJ RTD FAILURE The RTD temperature sensing device for sensing the cold junction
temperature has failed. If the problem persists, replace the
transmitter electronics.
FLOW SIMULATION The transmitter flow signal is being simulated by a signal generator
internal to the transmitter. The actual flow through the meter body is
NOT being measured.
SENSOR SIGNAL IGNORED The transmitter flow signal is being simulated by a signal generator
external to the transmitter. The actual flow through the meter body is
NOT being measured.
LOW LOOP VOLTAGE The voltage at the transmitter terminals has dropped to a level that is
causing the internal voltage supplies to drop, reducing the capability
of the transmitter to accurately measure a flow signal. Check the
terminal voltage and either increase the power supply voltage or
reduce loop resistance.
INTERNAL COMM FAULT After several attempts, the microprocessor failed in communication
with the Sigma-Delta ASIC. A power cycle may resolve the problem.
Also, check the inter-board connector. If the problem persists, replace
the transmitter electronics.
INTERNAL SIGNAL FAULT The flow data encoded on a pulse signal from the Sigma-Delta ASIC
to VDSP has been lost. A power cycle may resolve the problem. Also
check the inter-board connector. If the problem persists, replace the
transmitter electronics.
FACTORY NV MEM CONFIG ERROR A segment of nonvolatile memory that is written only at the factory
has failed a checksum verification. This fault cannot be fixed by
reconfiguring the transmitter parameters. Replace the transmitter
electronics.
TEMPERATURE ELECTRONICS FAILURE The electronics circuitry that supports the measurement of the
Process Temperature has failed. The transmitter can still be used in a
non-Process Temperature mode.
PROCESS TEMP OUT OF RANGE The Process Temperature is beyond the defined sensor limits of -50
°C to 427 °C.
PROCESS TEMP ABOVE SAT STEAM LIMITS The Process Temperature is above the high limit for Saturated Steam
density calculations. This status only occurs when the Process Fluid
is Temperature Compensated Saturated Steam. The density
calculation will continue using a Process Temperature of 320 °C.
PROCESS TEMP BELOW SAT STEAM LIMITS The Process Temperature is below the low limit for Saturated Steam
density calculations. This status only occurs when the Process Fluid
is Temperature Compensated Saturated Steam. The density
calculation will continue using a Process Temperature of 80 °C.
FIXED PROCESS TEMPERATURE IS ACTIVE Due to a problem detected with the thermocouple, a configured fixed
Process Temperature is being substituted for the measured Process
Temperature. This fixed Process Temperature is also being used in
saturated steam density calculations.
INVALID MATH COEFF The area of nonvolatile memory used to store the curve fit coefficients
for the coprocessor calculations does not contain valid data. This
data can only be loaded at the factory. Replace the transmitter
electronics.
CJ TEMP ABOVE SENSOR LIMITS The temperature reported from the Cold Junction temperature sensor
is above CJ sensor limits.
CJ TEMP BELOW SENSOR LIMITS The temperature reported from the Cold Junction temperature sensor
is below CJ sensor limits.
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