Samson foundation 3787, Mounting And Operating Instructions, Page: 79 / 96

8. Diagnostic messages
8.1 Messages of the XD_ERROR_EXT parameter (Transducer Block)
Failure mechanics
This message is issued when the entered rated travel is not reached on initialization.
- Check mechanics and pneumatics in the valve
- Compare the specifications in the Transducer Block, which describe the valve as well as
the actuator and the mechanical structure, with the actual valve.
Reinitialize.
Failure in measurement
The internal A/D converter does not work properly within its time interval, or the
measured values are outside of the physical measured range limit of the A/D converter. If
a warm start does not reset the data, repair is necessary.
Not initialized
The device has not been initialized.
Selfcalibration failed
Initialization could not be successfully completed. Exact details about the causes are sup-
plied by the SELF_CALIB_STATUS parameter.
Zero point error
This message indicates any changes exceeding or falling below the value determined dur-
ing the initialization or zero calibration by more than + 5%.
Possible sources of error:
Worn-out valve plug/seat
Impurities between valve plug/seat
Automatic reset after initialization has been successfully completed.
Internal control loop disturbed
This message is issued when the positioner is not able to control in the set delay time
within the set tolerance band.
Reset using SELF_CALIB_CMD - "Reset Control Loop Fault".
Travel time exceeded
The travel time determined during initialization has been exceeded.
EB 8383-1 EN
79
Diagnostic messages