VEGA VEGAFLEX 67 (-200…+400°C) 4 … 20 mA_HART two-wire - Manual (Page 40)

8 Maintenance and fault rectification
8 .1 Maintenance
I f the instrument is used properly, no special maintenance is required
in normal operation.
8 .2 Remove interferences
VEGAFLEX 67 offers maximum reliability. Nevertheless, faults can
occur during operation. These may be caused by the following, e.g.:
l S ensor
l P rocess
l V oltage 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
and the faults rectified this way.
S hould these measures not be successful, please call in urgent cases
the VEGA service hotline 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 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 evel fluctuations Set damping via the indicating and
adjustment module
4 … 20 mA signal
missing
E lectrical con-
nection faulty
C heck connection according to chap-
ter " Connection steps " and if ne-
cessary, correct according to chapter
"
Wiring plan "
V oltage supply
missing
C heck cables for breaks; repair if
necessary
O perating voltage
too low or load
resistance too
high
C heck, adapt if necessary
Failure reasons
Fault rectification
24 hour service hotline
Check the 4 … 20 mA
signal
40 VEGAFLEX 67 • 4 … 20 mA/HART - two-wire
8 M aintenance and fault rectification
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-EN
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