Vega VEGAPULS 68 Operating Instructions Manual - page 27
8 Maintenance and fault rectification
8.1 Maintenance, cleaning
When used in the correct way, no special maintenance is required in
normal operation.
In 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
The 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
Sensor
l
Process
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Power supply
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Signal processing
The 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.
However, should these measures not be successful, call the VEGA
service hotline in urgent cases under the phone no. +49 1805 858550.
The 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
English language. The service is free of charge, only the standard
telephone costs will be charged.
Connect a handheld multimeter in the suitable measuring range
according to the wiring plan.
?
4 … 20 mA signal not stable
l
Level fluctuations
à Set damping via the indicating and adjustment module
?
4 … 20 mA signal missing
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Wrong 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 Maintenance and fault rectification
29261
-EN
-090305
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No power supply
à Check cables for breaks; repair if necessary
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Operating voltage too low or load resistance too high
à Check, adapt if necessary
?
Current signal greater than 22 mA or less than 3.6 mA
l
Electronics module defective
à Exchange instrument or return instrument for repair
In Ex applications, the regulations for the wiring of intrinsically safe
circuits must be observed.
?
E013
l
no measured value available
à sensor in boot phase
à Sensor does not find an echo, e.g. due to faulty installation or
wrong parameter adjustment
?
E017
l
Adjustment span too small
à Carry out a fresh adjustment and increase the distance
between min. and max. adjustment
?
E036
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no operable sensor software
à Carry out a software update or send the instrument for repair
?
E041, E042, E043
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Hardware error, electronics defective
à Exchange instrument or return instrument for repair
Depending on the failure reason and measures taken, the steps
described in chapter "Set up" must be carried out again, if necessary.
8.3 Exchanging the electronics module
If the electronics module is defective, it can be replaced by the user.
In Ex applications only one instrument and one electronics module with
respective Ex approval may be used.
If there is no electronics module available on site, one can be ordered
from the VEGA agency serving you.
The new electronics module must be loaded with the settings of the
sensor. These are the options:
Fault messages via the
indicating/adjustment
module
Reaction after fault rec-
tification
Sensor serial number
52
VEGAPULS 68 • 4 … 20 mA/HART two-wire
8 Maintenance and fault rectification
29261
-EN
-090305