Controller Failure Symptoms - Honeywell UDC3200 Product Manual

Troubleshooting/Service
Lower
Display
• PV low limit is > PV high limit
CONF ERR
• SP low limit is > SP high limit
• Output low limit > Output high limit
PV LIMIT PV out of range.
PV = INP1 x RATIO1+ INP1 BIAS
The result of the formula shown below is
RV LIMIT
beyond the range of the remote variable.
RV = INP2 X RATIO + BIAS
Setpoint Program start segment number is
SEGERR
less than ending segment number.
Slidewire calibration never performed.
CAL MTR
Position Proportional slidewire input failure. See the Trouble Shooting Procedure in Section 7.7.
SW FAIL
SOOTING Percent Carbon falls outside sooting
boundary
Thermocouple on Input x (1 or 2) is
TCx WARN
starting to burnout.
The Thermocouple on Input x (1 or 2) is in
TCxFAIL
imminent danger of burning out.
CURFAIL Current Output is less than 3.5 mA.
AXFAIL Auxiliary Output is less than 3.5 mA.

7.6 Controller Failure Symptoms

Introduction
In addition to the error message prompts, there are failure symptoms that can be
identified by noting how the controller displays and indicators are reacting.
Symptoms
Compare your symptoms with those shown in Table 7-4.
158
Reason for Failure
UDC3200 Universal Digital Controller Product Manual
How to Correct the Problem
1. Check the configuration for each item and
reconfigure if necessary.
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
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.
Check SP Program configuration, subsection 3.5 Set
up Group SPPROG function prompts "STRSEG" and
"ENDSEG".
Field Calibrate the slidewire. See Section 6.4.
Check process for correct operation.
This diagnostic message means that 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.
This diagnostic message means that 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.
The current output is open circuit. Check the field
wiring. See Procedure #2.
The auxiliary output is open circuit. Check the field
wiring. See Procedure #9.
12/04