User's Manual

7ML19985FH04 SITRANS LR 400 – INSTRUCTION MANUAL Page 75
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Troubleshooting
Troubleshooting
The SITRANS LR 400 is factory-tested. Carefully selected components and compliance
with prescribed quality standards guarantee the high reliability of the SITRANS LR 400.
Please review the instructions below for troubleshooting before contacting the
responsible customer services.
Classification of Faults
Faults occurring in the SITRANS LR 400 can be classified in the following groups:
• faults caused by ambient influences: over- and under-temperature, moisture,
contamination by the measuring medium and other substances, mains faults,
vibration
• faults in the device: display, electronics, mechanics, connections
Please try to determine the fault and localize it as accurately as possible.
If the fault cannot be eliminated with the measures described below, follow the
instructions in Maintenance on page 78.
Self-test
If you get fault messages after the self-test, please proceed according to Fault Messages
on page 76.
If there is a malfunction in the device, you can also activate the self-test manually with
Parameter 3.2.1.
Symptoms, Causes and Their Remedy
Note: The device performs a self-test every time it is switched on. It is ready for
operation when the LCD displays the multi-display.
Symptom Possible causes Remedy
No display on the LCD
Defective or missing
power supply
Check that the power supply is connected
correctly.
LCD is defective
Connect a HART Communicator or a PC/Laptop
with SIMATIC PDM software. If the device can be
parameterized from there, the LCD is defective.
Electronics are
defective
Measure the analog current output. If the output
current is not between 3.6 mA < x < 22 mA, the
electronics are defective. Replace the electronics
unit as described in Maintenance on page 78.
A fault message is
displayed
Internal fault
Call the fault display in Function 3.1.
Proceed as described in Maintenance on page 78.