Honeywell STT25D Operator's Manual page 24

SYMPTOM SFC MESSAGE/
Incorrect "STATUS
output signal CHECK = O.K."
with but does not
simulating correspond to
device value set by
simulating device
"INVALID "INVALID
REQUEST" REQUEST"
when
changing
LRV or URV
Non-critical "USER CORR
status ACTIVE"
message,
without # sign
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.
Smart Temperature Transmitter STT250 – Operator Manual
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 CURE
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.
Reduce the URV or
SPAN before
changing the LRV.
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.
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