Download Operating Instructions MINITRAC 31

9 Diagnostics and service
Error
Cause
Rectification
4 … 20 mA signal Electrical connec- Check connection according to
missing
tion faulty
chapter "Connection steps" and if
necessary, correct according to chapter "Wiring plan"
Voltagesupply
missing
Check cables for breaks; repair if necessary
Operating voltage Check, adapt if necessary
too low or load resistance too high
Current signal greater than
22 mA or less
than 3.6 mA
Check output signal
(level detection)
Instrument on fail- Note error message on the display
ure message
and adjustment module
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
Voltagesupply
missing
Check cables for breaks; repair if necessary
Operating voltage Check, adapt if necessary
too low or load reThe instrument
sistance too high
signals covered
with covering with Electrical connec- Check connection according to
tion faulty
chapter "Connection steps" and if
the medium
necessary, correct according to chapter "Wiring plan"
43389-EN-131119
Current signal greater than
22 mA or less
than 3.6 mA
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
Electronics module in the sensor
defective
Note error messages on the display
and adjustment module
Check the Delta I value.
Improve the switching threshold - carry out a double point adjustment
Reaction after fault rectification
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.
24 hour service hotline
Should these measures not be successful, please call in urgent cases
theVEGAservicehotlineunderthephoneno.+49 1805 858550.
The hotline is also available outside normal working hours, seven
days a week around the clock.
MINITRAC 31 • 4 … 20 mA/HART - four-wire
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