Ametek Thermox 2000 ATEX Series User Manual page 134

6-6 | Thermox Series 2000 WDG-HPII / HPIIC - ATEX
Temp Rise Failure
This error message indicates that the sensor has failed to increase in tem-
perature a minimum of 10 °C in a 60-second time frame during start-up.
Once the system reaches the operating set point, this message will only
occur if the sensor falls below the set point by 15 °C and fails to recover
within 60 seconds. The problems that can cause this error are as follows:
AC line power problem at the sensor
Open furnace
Over-temperature protection circuit trip on the sensor board
Sensor board failure
Loss of furnace drive signal
Interconnecting wiring problem
T/C (Thermocouple) Circuit Failure
This message appears when the control unit recognizes a sudden drop in
temperature (greater than 100 °C). The thermocouple circuit failure mes-
sage can be the result of one of the following problems:
Shorted thermocouple
Faulty interconnecting wiring
Control unit display module failure
Sensor board failure
If this message is soon followed by a "Thermocouple Failure" message,
see that message for troubleshooting instructions.
Thermocouple Failure
This error message occurs when the indicated sensor temperature falls
below -70 °C. This error message can be the result of one of the following:
Open thermocouple
Faulty interconnecting wiring
Control unit display module failure