VEGA VEGAPULS 62 (≥ 2.0.0 - ≥ 4.0.0) 4 … 20 mA_HART four-wire Approval according to LPR radio standard - Manual (Page 56)

Code
Text mes-
sage Cause Rectification
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.
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
l Level fluctua-
tions
l Set damping according to the in-
strument via the indicating and
adjustment module or PACTware/
DTM
4 … 20 mA signal
missing l Electrical con-
nection faulty
l Check connection according to
chapter "Connection steps" and if
necessary, correct according to
chapter "Wiring plan".
l Voltage supply
missing
l Check cables for breaks; repair if
necessary
l Operating vol-
tage too low or
load resis-
tance too high
l Check, adapt if necessary
Reaction when malfunc-
tions occur
Procedure for fault rec-
tification
Check the 4 … 20 mA
signal
56 VEGAPULS 62 • Approval according to LPR radio standard
9 Diagnosis, Asset Management and service
41719
-EN
-120301