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7 Diagnosis, asset management and service
VEGAPULS WL 61 • Profibus PA
38062-EN-140801
Code
Text mes-
sage
Cause
Rectification
M505
No echo avail-
able
– Level echo can no longer
be detected
– Clean the antenna
– Use a more suitable
antenna/sensor
– Remove possible false
echoes
– Optimize sensor position
and orientation
7.4 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
•
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 rectified.
The below tables show typical examples of application-related meas-
urement errors with liquids. The measurement errors are differentiated
according to the following:
•
Constant level
•
Filling
•
Emptying
The images in column "
Error pattern
" show the real level with a bro-
ken line and the level displayed by the sensor as a continuous line.
1
2
Level
time
0
1 Real level
2 Level displayed by the sensor
Notes:
•
Wherever the sensor displays a constant value, the reason could
also be the fault setting of the current output to "
Hold value
"
•
In case of a too low level indication, the reason could be a line
resistance that is too high
Reaction when malfunc-
tions occur
Procedure for fault recti-
fication
Treatment of measure-
ment errors with liquids
