Troubleshooting; Classification Of Faults; Self-Test; Symptoms, Causes And Their Remedy - Siemens sitrans LR 400 Instruction Manual

Troubleshooting

The SITRANS LR 400 has left the factory in a fully tested condition. Carefully selected
components and compliance with prescribed quality standards guarantee the high
reliability of the SITRANS LR 400. In the unlikely event of a fault, please consult the
instructions in this chapter 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 undertemperature, 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, follow the instructions in
Maintenance on page 69.

Self-test

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 and the control elements can be
operated.
If you get fault messages after the self-test, please proceed according to Fault Messages
on page 67.
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

Symptom
No display on the LCD
A fault message is
displayed
Page 66
Possible causes
Defective or missing
power supply
LCD is defective
Electronics are
defective
Internal fault
SITRANS LR 400 – INSTRUCTION MANUAL
Remedy
Check that the power supply is connected
correctly.
Connect a HART Communicator or a PC/Laptop
with SIMATIC PDM software. If the device can be
parameterized from there, the LCD is 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 69.
Call the fault display in Function 3.1.
Proceed as described in Maintenance on page 69.
7ML19985FH03