Troubleshooting/Service
76 UDC2500 Universal Digital Limit ControllerProduct Manual 8/05
Lower
Display
Reason for Failure How to Correct the Problem
PV LIM
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
TCWARN
The Thermocouple is starting to
burnout.
This is a warning message 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 are
above 100 ohms.
TCFAIL
The Thermocouple is in imminent
danger of burning out.
This is a warning message that the controller
has detected that the thermocouple will soon fail.
User should consider replacing the
thermocouple as soon as possible.
OUT2FL
Auxiliary Output is less than 3.5 mA. The auxiliary output is open circuit. Check the
field wiring. See Procedure #9.
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