Vega VEGABAR 20 Bedienungsanleitung PDF herunterladen (Seite 21)

VEGABAR 20 21

Diagnosis

5 Diagnosis

5.1 Maintenance

VEGABAR process pressure transmitters are

maintenance free.

5.2 Failure removal

Fault signals

VEGABAR provides high 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 not reaching the measuring

range limits (fault signal extinguishes when

the value is again in the measuring range).

Failure in VEGABAR

Failure in the electronics, interferences or

damages in the measuring cell.

The following table assists in analysing the

fault signals.

Reason Fault signal via

DOT-matrix Bargraph Current

Digital indication output

Clearly “OPERATE Bargraph 0 %

outside ???? or 100 % Current

measuring bar“, Digital value value

range no adjust- flashes, tendency 3,6 mA

ment indication or

possible active >21,6 mA

Overload Bargraph 0 %

range or 100 %,

of the for digital value

measuring four segments

cell flash

Failure in “Defect“, all segments

VEGABAR no adjust- flash

ment

possible, no

measuring

function

On instruments with menu-guided adjustment

with additional functions, possible reasons

are displayed under the menu point “Diagno-

sis no.“ in case of failure.

Diagnosis no. Meaning

1 No frequency from C/f-converter

2 Frequency signal of the capacitor

outside the limit values

3 Frequency signal of the reference

capacitor outside the limit values

4 Frequency signal temperature outside

the limit values

7 Communication erro to EEPROM

9 Error in EEPROM CRC-checksum

Troubleshooting

If the indicated value does not correspond to

the level in the vessel or to the process pres-

sure, the following measures must be carried

out:

- check the pressure compensation (only

with overpressure measuring ranges)

- check the electrical connection.

Checking pressure compensation

Open the housing of VEGABAR. The meas-

ured value should not change. However if the

indicated value changes, compensation of

the atmospheric pressure is not ensured and

the measured value will be affected. Check

the breather facility on the VEGABAR-hous-

ing.

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