Vega VEGAFLEX 81 - 8.4 Rectify faults; Reaction when malfunctions occur; Procedure for fault rectification; Check the 4... 20 mA signal

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8 Diagnostics and service
VEGAFLEX 81 • Modbus and Levelmaster protocol
42283-EN-140430
Code
Text mes-
sage
Cause Rectication
M504
Error on an
device inter-
face
– Hardware defect – Exchanging the electronics
– Send instrument for repair
M505
no measured
value avail-
able
– Sensor does not detect an
echo during operation
– Check and correct instal-
lation and/or parameter
adjustment
– Process component or
probe contaminated or
defective
– Clean or exchange process
component or probe
M506
Installation/
Setup error
– Error during setup – Check and correct instal-
lation and/or parameter
adjustment
– Check probe length
M507
Error in the
instrument
settings
– Error during setup
– Error when carrying out a
reset
– False signal suppression
faulty
– Carry out reset and repeat
setup
8.4 Rectify faults
The operator of the system is responsible for taking suitable meas-
ures to rectify faults.
Therstmeasuresare:
•
Evaluation of fault messages, for example via the display and
adjustment module
•
Checking the output signal
•
Treatment of measurement errors
Further comprehensive diagnostics options are available with a PC
with PACTware and the suitable DTM. In many cases, the reasons can
bedeterminedinthiswayandfaultsrectied.
Connect a multimeter in the suitable measuring range according to
the wiring plan. The following table describes possible errors in the
current signal and helps to remove them:
Error Cause Rectication
4 … 20 mA signal
not stable
– Fluctuations of
the measured
variable
– Set damping according to the
instrument via the display and
adjustment module or PACTware/
DTM
Reaction when malfunc-
tions occur
Procedure for fault recti-
cation
Check the 4 … 20 mA
signal