171
Temperature Low Alarm
This error message is caused by the temperature signal from a sensor being below the user-
programmed value for the low alarm limit.
Possible
Causes
Corrective
Actions
The actual temperature is too low.
Correct problem with process.
The programmed value is set too close to
Go to the sensor input page and.
the normal operating temperature.
decrease the low alarm limit.
The temperature sensor has lost calibration.
Go to the sensor input page and calibrate the
temperature.
Faulty circuit board.
Go to the sensor input page and perform
a self test. If the self test fails, then the sensor
input board (if sensors 2-4) or the core interface
board (if sensor 1) should be replaced.
Faulty temperature sensor.
If a successful calibration is not possible,
the temperature sensor is probably faulty, and
the sensor should be replaced.
Poor connection of temperature wires.
Excessive resistance from extension cables or
poor connections can lower the temperature
reading. Clean & tighten all connections
to the temperature sensor.
8.2
PROBLEMS THAT DON’T GENERATE AN ERROR MESSAGE
Submit buttons do not appear on any page
You have logged in using a Calibration level or Read Only level password. Only the Master level
password allows changes to be made.
Sensor Input menu links missing
The controller not detecting the sensor input option board at power up causes this problem.
Possible Causes
Corrective Actions
No sensor input board is installed
Install a sensor input board.
Loose option board connection.
Remove power to the unit.
Push board onto pins and turn power on.
Faulty sensor input board.
This should cause a “Sensor Board Failure” error
message, but this can be cleared once the power
is cycled. Replace the sensor input board.
Содержание WebMaster
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Страница 30: ...26 Figure 7 Wiring Diagram for Optional Digital Communications ...