Troubleshooting With Hart Communicator - Honeywell STT700 SmartLine User Manual

6.3.2. Troubleshooting with HART communicator

Troubleshooting the STT700 HART transmitter loop is greatly simplified by connecting a HART
Communicator in the termination area near the receiving instrument. Also connect a digital volt
meter (DVM), at the termination area for the receiving instrument, to confirm a similar signal is
coming from the field and power is available on the two wires of the 4-20 mA loop. This isolates
the problem to either field loop or receiving instrument/power supply/wiring/safety barriers etc. If
the original symptom was an unstable input, it could be a loose connection on the receiving side.
Assuming the above confirms a field loop problem, the likely causes/actions are given below.
Condition
Diagnostics Failure.
A critical failure has been
detected on the HART
Electronics.
DAC Failure.
A critical failure has been
detected on the HART
Electronics.
Sensor Input Failure.
A critical failure has been
detected on the HART
Sensor Inputs.
Configuration Corrupt.
A critical failure has been
detected on the HART
Electronics.
For DE please refer to STT700 HART/DE option manual, #34-TT-25-18.
Revision 2
Analysis
Use a HART device
communicator to read the
detailed status information from
the transmitter. Refer to the
appropriate manual for more
details about the possible failure
causes.
Use a HART device
communicator to read the
detailed status information from
the transmitter. Refer to the
appropriate manual for more
details about the possible failure
causes.
Use a HART device
communicator to read the
detailed status information from
the transmitter. Refer to the
appropriate manual for more
details about the possible failure
causes.
Use a HART device
communicator to read the
detailed status information from
the transmitter. Refer to the
appropriate manual for more
details about the possible failure
causes.
STT700 Temperature Transmitter User's Manual
Recommended Corrective Action
Power cycle the transmitter and if problem
persists replace the transmitter.
Power cycle the transmitter and if problem
persists replace the transmitter.
If detail status indicate input fault (open,
short...), correct the root error by checking
the input connection to the transmitter and
sensor type configuration.
If problem persists even after verifying the
input connection and sensor input type
configuration, replace the transmitter.
Power cycle the transmitter and if problem
persists replace the transmitter.
Page 31