VEGA VEGAPULS 61 (≥ 2.0.0 - ≥ 4.0.0) Foundation Fieldbus Approval according to LPR radio standard - Manual (Page 58)

Code
Text mes-
sage Cause Rectification
M 503
Reliability too
low
l The echot/noise ratio is the
small for a reliable measu-
rement
l Check installation and pro-
cess conditions
l Clean the antenna
l Change polarisation direc-
tion
l Use instrument with higher
sensitivity
M 504
Error on an
device inter-
face
l Hardware defect l Check connections
l Exchange of the electro-
nics
l Send instrument for repair
M 505
No echo avai-
lable
l Level echo can no longer
be detected
l Clean the antenna
l Use a more suitable an-
tenna/sensor
l Remove possible false
echoes
l Optimize sensor position
and orientation
9 .4 Remove interferences
The operator of the system is responsible for taking suitable measures
to rectify faults.
The first measures are:
l Evaluation of fault messages via the indicating and adjustment
module
l Checking the 4 … 20 mA signal
l Treatment of measurement errors
Further comprehensive diagnosis possibilities are offered by a PC with
the software PACTware and suitable DTM.
In many case, the failure reasons can thus be determined and faults
rectified.
The below tables show typical examples of application-relevant
measurement errors with liquids. The measurement errors are
differentiated according to the following:
l Constant level
l Filling
l Emptying
Reaction when malfunc-
tions occur
Procedure for fault rec-
tification
Treatment of measure-
ment errors with liquids
58 VEGAPULS 61 • Approval according to LPR radio standard
9 Diagnosis, Asset Management and service
41716
-EN
-120301