VEGA VEGAFLEX 83 Foundation Fieldbus PFA insulated - Manual (Page 62)

62
9 Diagnostics and service
VEGAFLEX 83 • Foundation Fieldbus
44227-EN-130910
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
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
•
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.
The below tables show typical examples for application-relevant
measurement errors. There are two measurement errors:
•
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
Fig. 32: The broken line 1 shows the real level, the continuous line 2 shows the
level displayed by the sensor
Reaction when malfunc-
tions occur
Procedure for fault recti-
fication
Treatment of measure-
ment errors