Honeywell UDC3500 - Page 329

Troubleshooting/Service
3/07 UDC3500 Universal Digital Controller Product Manual 313
Lower
Display
Reason for Failure How to Correct the Problem
INP5FAIL
Two consecutive failures of input 5
integration; i.e., cannot make analog
to digital conversion.
Same as INP1FAIL above.
CONF ERR
• PV low limit is > PV high limit
• SP low limit is > SP high limit
• Output low limit is > Output high limit
Check the configuration for each item and
reconfigure as necessary.
PV LIMIT
PV out of range.
PV = INP1 x RATIO1+ INP1 BIAS
1) Make sure the input signal is correct.
2) Make sure the Ratio and Bias settings are
correct.
3) Recheck the calibration. Use Bias of 0.0
RV LIMIT
The result of the formula shown below
is beyond the range of the remote
variable.
RV = INP2 X RATIO + BIAS
1) Make sure the input signal is correct.
2) Make sure the Ratio2 and Bias2 settings are
correct.
3) Recheck the calibration. Use a Ratio2 of 1.0
and a Bias2 of 0.0.
RH LOW
RH Excessive Temperature
Depression – Calculated %RH is less
than 0%.
1) Make sure the input signals are correct.
2) Make sure the Ratio and Bias settings are
correct for each input.
3) Recheck the calibration. Use Bias of 0.0
SEGERR
Setpoint Program start segment
number is less than ending segment
number.
Check SP Program configuration, subsection
3.6
Set up Group SPPROG function prompts
“STRSEG” and “ENDSEG”.
CAL MTR
Slidewire calibration never performed. Field Calibrate the slidewire. See Section 6.5.
SW FAIL
Position Proportional slidewire input
failure.
See the Trouble Shooting Procedure in Section
7.7.3.
SOOTING
Percent Carbon falls outside sooting
boundary
Check process for correct operation.
TCx WARN
The Thermocouple on Input x (1 or 2
or 3) is starting to burnout.
The controller has detected that the
thermocouple is starting to burnout. This error
message may also be created if the resistance
of the wires used to connect the thermocouple to
the instrument is above 100 ohms (50 ohms per
leg).
TCxFAIL
The Thermocouple on Input x (1 or 2
or 3) is in imminent danger of burning
out.
The controller has detected that the
thermocouple will soon fail. User should
consider replacing the thermocouple as soon as
possible. This message will also be generated if
the resistance of the wires used to connect the
thermocouple to the instrument is above 180
ohms (90 ohms per leg).