VEGA VEGAPULS 68 (≥ 2.0.0 - ≤ 3.8) 4 … 20 mA_HART two-wire - Manual (Page 51)

8 Maintenance and fault rectification
8.1 Maintenance, cleaning
W hen used in the correct way, no special maintenance is required in
normal operation.
I n some applications, buildup on the antenna system can influence the
measuring result. Depending on the sensor and application, make
arrangements to avoid strong pollution of the antenna system. If
necessary, clean the antenna system in certain intervals.
8.2 Remove interferences
T he operator of the system is responsible for taken suitable measures
to remove interferences.
A
maximum of reliability is ensured. Nevertheless, faults can occur
during operation. These may be caused by the following, e.g.:
l S ensor
l P
rocess
l P ower supply
l S ignal processing
T he first measures to be taken are to check the output signals as well
as to evaluate the error messages via the indicating and adjustment
module. The procedure is described below. Further comprehensive
diagnostics can be carried out on a PC with the software PACTware
and the suitable DTM. In many cases, the causes can be determined
in this way and faults can be rectified.
H owever, should these measures not be successful, call the VEGA
service hotline in urgent cases under the phone no. +49 1805 858550.
T he hotline is available to you 7 days a week round-the-clock. Since
we offer this service world-wide, the support is only available in the
E
nglish language. The service is free of charge, only the standard
telephone costs will be charged.
C onnect a handheld multimeter in the suitable measuring range
according to the wiring plan.
? 4 … 20 mA signal not stable
l L evel fluctuations
à Set damping via the indicating and adjustment module
? 4 … 20 mA signal missing
l W rong connection
à Check connection according to chapter "Connection steps"
and if necessary, correct according to chapter "Wiring plan"
Reaction when malfunc-
tions occur
Causes of malfunction
Fault rectification
24 hour service hotline
Checking the 4 … 20 mA
signal
VEGAPULS 68 • 4 … 20 mA/HART two-wire 51
8 M aintenance and fault rectification
29261
-EN
-090305