VEGA VEGABAR 44 Profibus PA - Manual (Page 31)

VEGABAR 44 (Profibus PA) 31
Diagnostics
5 Diagnostics
5.1 Maintenance
VEGABAR process pressure transmitters are
maintenance-free.
5.2 Failure rectification
Fault signals
VEGABAR provides maximum reliability
through its self-test and continuous self-
monitoring. If however malfunctions occur,
VEGABAR diagnosis distinguishes between
atypical process conditions and faults in the
VEGABAR.
Atypical process conditions
Exceeding or falling short of measuring
range limits (fault signal extinguishes when
the measured value is again in the measuring
range).
Failure in VEGABAR
Failure in the electronics, interference or
damage in the measuring cell.
The following table assists in analysis of fault
signals.
Reason Fault signal via
DOT-matrix Bar graph
Digital indication
Clearly "OPERATE Bar graph 0 %
outside ???? or 100 %
measuring bar“, digital value
range no more flashes, tendency
adjustment indication
possible active
Overload Bar graph 0 %
range or 100 %,
of the for digital value
meas. cell four segments
flash
Failure in all segments
VEGABAR flash
On instruments with menu-driven adjustment
with additional functions, the possible rea-
sons are displayed under the menu items
"Diagnosis-no.“ in case of failure.
Diagnosis-no. Meaning
1 No frequency from C/f-converter
2 Frequency signal of the capacitor not
within the limit values
3 Frequency signal of the reference
capacitor not within the limit values
4 Frequency signal temperature not
within the limit values
7 Communication with EEPROM
disrupted
9 Error in EEPROM CRC-checksum
11 Process connection or electronics
module has been exchanged
(appears for approx. 20 s after
switching on for the first time after
exchange)
Troubleshooting
If the displayed value does not correspond
to the level in the vessel or to the process
pressure, the following measures must be
taken:
- check the pressure compensation (only
with gauge pressure measuring ranges)
- check the electrical connection.
Checking pressure compensation
Open the housing of VEGABAR. The meas-
ured value must not change. However if the
displayed value changes, compensation of
the atmospheric pressure is not ensured and
will lead to distortion of the measured value.
Check the breather on the VEGABAR
housing.