Troubleshooting; Classification Of Faults; Self-Test; Symptoms, Causes And Their Remedy - Siemens Sitrans LR400 Instruction Manual

Troubleshooting

SITRANS LR400 is factory tested and calibrated. Carefully selected components and
compliance with prescribed quality standards guarantee the high reliability of SITRANS
LR400. Please review the instructions below for troubleshooting assistance before
contacting Siemens Milltronics.

Classification of Faults

Faults occurring in SITRANS LR400 can be classified in the following groups:
• faults caused by ambient influences: over- and under-temperature, moisture,
contamination by the material 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.

Self-test

When power is supplied, the device performs a self-test. Then, when the
Note:
multi-display appears, the device is ready for programming.
If you get fault messages after the self-test, please proceed according to Fault Messages
on page 82.
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
An incorrect
measured value
appears after Auto-
Setup.
7ML19985FH06 SITRANS LR400 (7ML5421) – INSTRUCTION MANUAL
Possible causes
Defective or missing Check that the power supply is connected
power supply correctly.
Connect a HART Communicator or a PC/Laptop
LCD is defective with SIMATIC PDM software. If the device can be
programmed from there, the LCD is defective.
Measure the analog current output. If the output
Electronics are current is not between 3.6 mA < x < 22 mA, the
defective electronics are defective. Contact your local
Siemens Milltronics representative.
Call the fault display in Function 3.1. Proceed as
Internal fault
described in Fault Messages starting on page 82
The device is not
programmed Set the device parameters and functions
correctly for the manually.
application
Remedy
Page 81