Emerson Rosemount 8800D Series Reference Manual page 78

Troubleshooting
May 2016
Table 5-2. Field Communicator Diagnostic Messages
Message
ROM CHECKSUM ERROR
NV MEM CHECKSUM ERROR
RAM TEST ERROR
DIGITAL FILTER ERROR
COPROCESSOR ERROR
SOFTWARE DETECTED ERROR
ELECTRONICS FAILURE
TRIGGER LEVEL OVERRANGE
LOW PASS FILT OVERRANGE
ELECTRONICS TEMP OUT OF
LIMITS
INVALID CONFIGURATION
FACTORY EEPROM
CONFIG ERROR
LOW FLOW CUTOFF
OVERRANGE
T/C A/D ERROR
THERMOCOUPLE OPEN
CJ RTD FAILURE
70
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.
The digital filter in the transmitter electronics is not reporting. The transmitter will
remain in ALARM until the digital signal processor resumes reporting flow data.
If this occurs at power-up, the RAM/ROM test in the coprocessor has failed. If this
occurs during normal operations, the coprocessor has reported either a math error
or a negative flow. This is a FATAL error and the transmitter will remain in ALARM until
reset.
The software has detected corrupted memory. One or more of the software tasks
has corrupted memory. This is a FATAL error and the transmitter will remain in
ALARM until reset.
This is a summary error indication. This error will be reported if any of the following
error conditions are present:
1. ROM Checksum Error
2. NV Memory Checksum Error
3. RAM Test Error
4. ASIC Interrupt Error
5. Digital Filter Error
6. Coprocessor Error
7. Software Detected Error
The trigger level in the transmitter digital signal processing has been set beyond its
limit. Use manual filter adjustment to "Increase Filtering" or "Increase Sensitivity" to
bring the trigger level back within range.
The low pass filter in the transmitter digital signal processing has been set beyond its
limit. Use manual filter adjustment to "Increase Filtering" or "Increase Sensitivity" to
bring the low pass filter adjustment back within range.
The electronics temperature sensor within the transmitter is reporting a value out of
range.
Certain configuration parameters are out of range. Either they have not been
properly configured, or they have been forced out of range as a result of a change to
a related parameter. For example: When using mass flow units, changing the process
density to a value too low could push the configured Upper Range Value beyond the
sensor limit. In this case, the Upper Range Value would need to be reconfigured.
The factory configured values in non-volatile EEPROM memory have become
corrupted. This is a FATAL error. The transmitter will remain in ALARM until reset.
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.
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.
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.
The RTD temperature sensing device for sensing the cold junction temperature has
failed. If the problem persists, replace the transmitter electronics.
Reference Manual
00809-0100-4004, Rev DC
Troubleshooting