Maintenance and servicing
5.4 Display in case of a fault
SITRANS P DS III
34 Service Manual, 06/2014, A5E34219855-01
Check the start of scale value of the device from time to time.
Differentiate between the following in case of a fault:
● The internal self test has detected a fault, e.g. sensor break, hardware fault/Firmware
fault.
Displays:
– Display: "ERROR" display and ticker with an error text
– Analog output: Factory setting: Failure current 3.6 or 22.8 mA
Or depending on the parameterization
– HART: detailed error breakdown for display in the HART communicator or SIMATIC
PDM
● Grave hardware faults, the processor is not functioning.
Displays:
– Display: no defined display
– Analog output: failure current < 3.6 mA
In the event of a defect, you can replace the application electronics by following the warning
notes and the provided operating instructions.
Each of the individual components "Measuring cell" and "Electronics" has a non-volatile
memory (EEPROM).
Measuring cell data (e.g.: measuring range, measuring cell material, oil filling) and user data
of the application electronics (e.g.: downscaling, additional electrical damping) are located in
the measuring cell EEPROM. User data is lost when the measuring cell is replaced.
Application-specific data are not lost when the application electronics are changed.
You can backup user data before changing the measuring cell and reload it afterwards. Use
an input device which supports the HART protocol. (e.g. HART communicator, PC with
HART modem and HART software or PC with HART modem and PDM software). Factory
settings will be used if user data is not backed up before the measuring cell is changed.
Technical developments enable advanced functions to be implemented in the firmware of the
measuring cell or application electronics. Further technical developments are indicated by
modified firmware statuses (FW). The firmware status does not affect whether the modules
can be replaced. However, the scope of functions is limited to the function of existing
components.
If a combination of certain firmware versions of measuring cell and application electronics is
not possible for technical reasons, the device will identify this problem and go into "Fault
current" mode. This information is provided via the HART interface.
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