VEGA MINITRAC 31 Profibus PA - Manual (Page 76)

76
9 Diagnostics and service
MINITRAC 31 • Profibus PA
43836-EN-131119
The following table describes possible faults that may not generate an
error message:
Error Cause Rectification
The instrument signals cov-
ered without covering with the
medium
The instrument signals cov-
ered with covering with the
medium
Voltage supply missing Check cables for breaks; repair if necessary
Operating voltage too low Check, adapt if necessary
Electrical connection faulty Check connection according to chapter
"Connection steps" and if necessary, correct ac-
cording to chapter "Wiring plan"
Electronics defective 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 inner wall of
the vessel
Remove buildup
Check the Delta I value.
Improve the switching threshold - carry out a
double point adjustment
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
In both cases, the serial number of the sensor is needed. The serial
numbers are stated on the type label of the instrument, on the inside
of the housing as well as on the delivery note.
When loading on site, first of all the order data must be downloaded
from the Internet (see operating instructions manual "Electronics
module").
Check output signal
(level detection)
Reaction after fault recti-
fication
24 hour service hotline