Rockwell Automation T3431-CA ICS Regent Thermo Couple Input Assembly - Manual (Page 6)

Thermocouple Input Assembly (T3431)
6
Industrial Control Services
Failure of the DC-to-DC converter supplying power to the
termination panel or the receiver circuitry can also result in a
MUX fault. Both of these faults are input module faults.
CJ Fault Indicator
There are two cold junction sensors located on the termination
panel. The red CJ FAULT indicator turns on when any of the
following fault conditions are detected:
·
Either CJ sensor temperature is < -5 ° C (23 ° F)
·
Either CJ sensor temperature is > 65 ° C (149 ° F)
·
The CJ sensors differ by more than 2.8 ° C (5 ° F)