Diagnosis, Fault Messages; Status Messages According To Ne 107 - Siemens SITRANS L Operating Instructions Manual

Diagnostics and troubleshooting
9.3 Diagnosis, fault messages
• Signal processing
Fault rectification
The first measures are:
• Evaluation of fault messages
• Checking the output signal
• Treatment of measurement errors
A smart device (smartphone/tablet) with the adjustment app or a PC/notebook
with the PDM and the suitable EDD offer you further comprehensive diagnostic
possibilities. In many cases, the causes can be determined in this way and the faults
eliminated.
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.
9.3

Diagnosis, fault messages

4 ... 20 mA signal
Connect a multimeter in the suitable measuring range according to the wiring
plan. The following table describes possible errors in the current signal and helps to
eliminate them:
Error
4 ... 20 mA signal not
stable
4 ... 20 mA signal missing
Current signal greater
than 22 mA, less than
3.6 mA
9.4 Status messages according to NE 107
The transmitter features self-monitoring and diagnostics according to NE 107 and
VDI/VDE 2650. In addition to the status messages in the following tables there are
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Cause
Fluctuating measured value
Electrical connection faulty
Voltage supply missing
Operating voltage too low, load
resistance too high
Transmitter electronics defective
Rectification
Set damping
Check connection, correct, if
necessary
Check cables for breaks; repair if
necessary
Check, adapt if necessary
Replace device or send in for repair
depending on device version
SITRANS LR140
Operating Instructions, 08/2020, A5E50352144