User Manual

Code
Text mes-
sage
Cause Removal
M503
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
M504
Error on an
device inter-
face
l Hardware defect l Check connections
l Exchange the electronics
l Send instrument for repair
9.4 Rectify malfunctions
The operator of the system is responsible for taking suitable measures
to remove interferences.
The first measures to be taken are to check the output signal as well as
to evaluate the error messages via the indicating and adjustment
module. Further comprehensive diagnostics can be carried out on a
PC with the software PACTware and the su itable DTM. In many cases,
the causes can be determined this way 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 Removal
4 … 20 mA signal
not stable
Level fluctuations Set damping via the indicating and
adjustment module
4 … 20 mA signal
missing
Electrical con-
nection faulty
Check connection according to chap-
ter "Connection steps" and if ne-
cessary, correct according to chapter
"Wiring plan"
Voltage supply
missing
Check cables for breaks; repair if
necessary
Operating voltage
too low or load
resistance too
high
Check, adapt if necessary
Reaction when malfunc-
tions occur
Fault rectification
Checking the 4 … 20 mA
signal
50 VEGAPULS 62 • 4 … 20 mA/HART two-wire
9 Diagnosis and service
36503-EN-100607