VEGA VEGAFLEX 81 4 … 20 mA_HART - four-wire Coax probe - Manual (Page 59)

59
9 Diagnostics and service
VEGAFLEX 81 • 4 … 20 mA/HART - four-wire
42280-EN-130314
Code
Text mes-
sage
Cause Rectification
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
9.4 Rectify faults
The operator of the system is responsible for taking suitable meas-
ures to rectify faults.
The first measures are:
•
Evaluation of fault messages, for example via the display and
adjustment module
•
Checking the output signal with 4 … 20 mA instruments
•
Treatment of measurement errors
Further comprehensive diagnostics options offer a PC with the soft-
ware PACTware and the suitable DTM. In many cases, the reasons
can be determined in this way and faults can be rectified.
Connect a handmultimeter 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 Rectification
4 … 20 mA signal
not stable
– Level fluctua-
tions
– Set damping according to the
instrument via the display and
adjustment module or PACTware/
DTM
Reaction when malfunc-
tions occur
Procedure for fault recti-
fication
Check the 4 … 20 mA
signal