Troubleshooting With Hart Communicator - Honeywell STT25D Operator's Manual

5.2.2

Troubleshooting with HART communicator

SYMPTOM
communicator
Incorrect None
output signal
with
simulating
device
When "VALUES TOO
changing HIGH OR TOO
LRV or URV LOW"
Status is set "USER CORR
to ACTIVE"
"USER
CORR
ACTIVE"
Remember that successful communications with the STT250 result in many useful
pieces of data. With the initial I.D. response,the user can confirm that the:
1. Transmitter is powered
2. Line resistance is correct
3. Wires run to the correct unit. If not, the unit connected can be identified by the
tag number.
22 Smart Temperature Transmitter STT250 – Operator Manual
HART
MESSAGE/
DISPLAY
The most common
error is changing
the sensor wiring
after probe type
selection or after
power-up.
If the LRV is
changed, the URV
tries to change by
the same amount to
maintain the same
SPAN. If this new
URV exceeds the
URL then this
message appears.
Transmitter has
been trimmed for
particular sensor
range. This can be
done by keying in
LRV/URV,
CORRECT, ENTER
with exact LRV and
URV input values to
enable improved
accuracy over the
specifications.
POSSIBLE
CAUSE
Check the appropriate
sensor wiring and power
cycle when it is correct.
Remember when changing
configuration to first connect
sensor wiring correctly, then
change configuration.
Make sure that:
LRV >= LRL
and that
URV <=URL
When performing a Reset
Correct command or a
sensor type change, the
transmitter will lose this
sensor correction and fall
back to the original factory
calibration.
CURE