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Instrument Calibration
50
515 HC04 - 8 June 2007
Error Messages
Failure of Analog Input Sensor
If there is a failure of an analog input sensor for a process parameter such as
temperature or pressure, the instrument sets the value of that parameter to 0
and displays the relevant error message. The input sensor and connections
need to be inspected and may require replacement.
The instrument also sets the results of calculations that depend on the failed
input(s) to 0. For example, if the temperature sensor fails, the instrument
displays a temperature reading of 0 and the calculated energy flow as 0.
However, if the flow sensors are still functioning, the instrument continues
to calculate and display volume flow.
Default Value on Exception
If Default Value On Exception has been enabled in the INPUTS section of
calibration, the default value will automatically be used so that all
calculations can continue. The error message will still continue to scroll
across the display until the fault is corrected at which point the calculations
will revert to using the live input.
Override Error Condition
While a fault is being rectified on an analog input for a process parameter,
an operator with calibration access can set the Analog Input Signal Type to
DEFAULT and the Analog Input Default Point to a typical process value. If
there are no other faults, the instrument continues to operate by using the
default value.
The system displays error messages as described in the following table:
Error Messages
Description
CPU Card Failure
There are failed components on the CPU card and technical support
is required.
Power Supply is Low
The input and/or output power supply voltage is too low, ensure that:
(a) input power supply voltage is within the specified range
(b) output power supply is not overloaded.
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