Stt04 Error Messages For Hart Devices - ABB STT04 Instruction Manual

TROUBLESHOOTING
Table 5-1. STT04 Error Messages for HART Devices
Affected
Message
A/D HIGH REF FAIL
A/D LOW REF FAIL
AMBIENT TEMP HIGH
AMBIENT TEMP LOW
AO SATURATED All HART Process variable is
CAL OFFSET
WARNING
CAL OFFSET
WARNING
(continued)
CALIBRATION FAILED
HIGH/LOW
CALIBRATION
REQUIRED
CELL EEPROM
FAILURE
CELL TEMP OVR/
UNDR ALARM
ERROR MESSAGES
5 - 2
Probable Cause
Device
PTH Reference problem on
EBTH circuit board.
PTH Reference problem on
EBTH circuit board.
EBTH Temperature inside the
electronics housing
exceeds 85°C (185°F)
EBTH Temperature inside the
electronics housing is
less than -50°C (-58°F)
greater than +103.13% or
less than -1.25% of its
range and the analog out-
put cannot show changes
in its process.
TB82 Large positive sensor off-
set (>180 mV) or large
negative sensor offset
(<-180 mV)
TB82 Large positive sensor off-
set (>180 mV) or large
negative sensor offset
(<-180 mV)
EBTH The applied calibration
signal is higher/lower
than allowable factory
limits.
PTH Field device needs to be
EBTH calibrated.
PTH Memory problem.
PTH Cell temperature over/
under user alarm limit.
Corrective Action
Replace amplifier assembly. If problem still
exists, replace cell and characterization
board. Refer to the repair/replacement sec-
tion of the appropriate instruction.
Replace amplifier assembly. If problem still
exists, replace cell and characterization
board. Refer to the repair/replacement sec-
tion of the appropriate instruction.
Remove the source of temperature
extreme.
Check for proper sensor connection to the
transmitter.
Check that the transmitter range is appro-
priate for the application.
Perform a D/A adjustment.
Clean sensor and perform buffer and pro-
cess calibration.
Inspect sensor and calibrating for shorts.
Remove all potential shorts to ground, con-
duit or metals.
If sensor is functioning properly, order spare
sensor to replace existing sensor with spare
when transmitter does not accept calibra-
tion values.
Calibrate the transmitter and verify the sup-
plied signals are within transmitter limits.
Calibrate the field device. Refer to the cali-
bration section of the appropriate product
instruction.
Remove power from the field device and
reapply. If problem persists replace the
amplifier assembly. Refer to repair/replace-
ment section of the field device product
instruction.
Correct temperature problem.
Change alarm value. Refer to configuration
procedures for PTH PRESSURE TRANS-
MITTER in Appendix D.