VEGA POINTRAC 31 8_16 mA_HART - four-wire - Manual (Page 42)

42
9 Diagnostics and service
POINTRAC 31 • 8/16 mA/HART - four-wire
39411-EN-131119
The following table describes possible faults that may not generate an
error message:
Error Cause Rectification
The instrument
signals covered
without covering
with the medium
The instrument
signals covered
with covering with
the medium
Voltage supply
missing
Check cables for breaks; repair if nec-
essary
Operating voltage
too low or load re-
sistance too high
Check, adapt if necessary
Electrical connec-
tion faulty
Check connection according to
chapter "Connection steps" and if
necessary, correct according to chap-
ter "Wiring plan"
Electronics de-
fective
Change the switching behaviour of the
sensors under "Diagnosis/Simulation".
If the instrument does not switch over,
send it in for repair.
Buildup on the in-
ner wall of the
vessel
Remove buildup
Check the Delta I value.
Improve the switching threshold - car-
ry out a double point adjustment
Current sig-
nal greater than
22 mA or less
than 3.6 mA
Electronics mod-
ule in the sensor
defective
Note error messages on the display
and adjustment module
Depending on the reason for the fault and the measures taken, the
steps described in chapter "Setup" must be carried out again or must
be checked for plausibility and completeness.
Should these measures not be successful, please call in urgent cases
the VEGA service hotline under the phone no. +49 1805 858550.
The hotline is also available outside normal working hours, seven
days a week around the clock.
Since we offer this service worldwide, the support is provided in
English. The service itself is free of charge, the only costs involved are
the normal call charges.
9.4 Exchanging the electronics module
If the electronics module is defective, it can be replaced by the user.
In Ex applications, only instruments and electronics modules with ap-
propriate Ex approval may be used.
If there is no electronics module available on site, the electronics
module can be ordered through the agency serving you. The electron-
ics modules are adapted to the respective sensor and differ in signal
output or voltage supply.
The new electronics module must be loaded with the default settings
of the sensor. These are the options:
•
In the factory
•
Or on site by the user
Check output signal
Reaction after fault recti-
fication
24 hour service hotline