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9 Diagnostics and service
MINITRAC 31 • 4 … 20 mA/HART - four-wire
40447-EN-130430
Code
Text mes-
sage
Cause
Rectification
S025
Bad lineariza
-
tion table
–
Bad linearization table
–
Carry out linearization
S038
Slave outside
the specifica
-
tion
–
Slave outside the specifica
-
tion
– Check Slave
S125
Ambient tem-
perature too
high/too low
– Ambient temperature too
high/too low
– Protect instrument with
isolating material against
extreme temperatures
The instrument has no status messages to the section "
Maintenance
".
9.3 Rectify faults
The operator of the system is responsible for taking suitable meas-
ures to rectify faults.
The first measures are:
•
Evaluation of fault messages, for example via the display and
adjustment module
•
Checking the output signal with 4 … 20 mA instruments
•
Treatment of measurement errors
Further comprehensive diagnostics options offer a PC with the soft
-
ware PACTware and the suitable DTM. In many cases, the reasons
can be determined in this way and faults can be rectified.
Connect 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
Level fluctuations
Set damping according to the instru-
ment via the display and adjustment
module or PACTware/DTM
4 … 20 mA signal
missing
Electrical connec-
tion faulty
Check connection according to
chapter "
Connection steps
" and if
necessary, correct according to chap-
ter "
Wiring plan
"
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
Maintenance
Reaction when malfunc-
tions occur
Procedure for fault recti-
fication
Check 4 … 20 mA signal
(level measurement)
