VEGA VEGABAR 41 4 … 20 mA - Manual (Page 25)

VEGABAR 41 (4 … 20 mA) 25
Diagnostics
5 Diagnostics
5.1 Maintenance
VEGABAR process pressure transmitters are
maintenance-free.
5.2 Failure rectification
Fault signals
VEGABAR provides maximum reliability with
its self-test and continuous self-monitoring. If
however malfunctions occur, VEGABAR diag-
nosis distinguishes between atypical proc-
ess 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 Current
Digital indication output
Clearly "OPERATE Bar graph 0 %
outside ???? or 100 % Current
measuring bar“ digital value value
range flashes 3.6 mA
or
>21.6 mA
Overload Bar graph 0 %
range or 100 %,
of the 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 item
"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 error to EEPROM
9 Error in EEPROM CRC-checksum
11 Process fitting or electronics unit has
been exchanged (appears for approx.
20 s after first switching on 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.