User's Manual

7ML19985FH01 Sitrans LR 400 – INSTRUCTION MANUAL Page 63
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Troubleshooting
Symptoms, causes and their remedy
Symptom Possible causes Remedy
No display on the
LCD
Defective or missing
power supply
Check that the power supply is connected
correctly. Replace the device fuse if necessary
(see “Changing the device fuse” on page 65).
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 and repairs”
on page 65.
A fault message
is displayed
Internal fault
Call the fault display in Function 3.1.
Proceed as described in “Maintenance and
repairs” on page 65.
An incorrect
measured value
appears after
Auto-Setup.
The device is not
parameterized correctly
according to the
application
Set the device parameters and functions
manually.
No measured
value appears
after the Auto-
Setup
(measured value
“0” and the fault
display flashes)
Internal fault
Call the fault display in Function 3.1.
Proceed as described in “Maintenance and
repairs” on page 65.
chap7.fm Page 63 Tuesday, October 9, 2001 1:06 PM