User's Manual

Page 76 SITRANS LR 400 – INSTRUCTION MANUAL 7ML19985FH04
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Troubleshooting
Fault Messages
The device indicates faults with a flashing letter on the right of the first line of the display.
It has the following meaning:
• W: Warning – device is still ready for operation but faults may occur
• F: Fault – sporadic fault, device conditionally ready for operation
• D: Continuous fault – device is not ready for operation
Under Parameter 3.1.x, you will find a fault log which indicates the type of the fault(s) that
occurred. It indicates the device function status in which the fault occurred and outputs a
fault message in plain text.
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 Parameter 3.1.
Proceed as described in Maintenance on page 78.
Material movement
but output remains
constant
Varying signal moves
out of tracking
window too
frequently.
Set Window Tracking (4.2.3.4) to OFF.
SITRANS LR 400 reads
100% continually.
Check antenna for
material buildup.
Clean antenna or order a purge (self-cleaning) kit.
Nozzle interference,
or end of horn is not
inside vessel
Shorten nozzle or lower position of SITRANS
LR 400.
SITRANS LR 400
reading stays above
actual level
False echo from
vessel (fixed
obstruction)
Use 4.2.3.8 and 4.2.3.9 Auto False Echo
Suppression function
SITRANS LR 400 reads
low or empty when
material level is high
Multiple or indirect
echo detected
instead of first echo.
Set 4.2.3.2 Multiple Echo Tracking to ON. Try using
Liquid Store application type 4.2.2.1.
Highly sloped surface
Aim the SITRANS LR 400 using shims or order an
Easy Aimer kit. Contact your Siemens
representative for service and possible User
parameter support.
SITRANS LR 400
reading is too slow.
Damping too high
Decrease 4.2.3.1 Sensor Damping
Decrease Level Damping
Set 4.2.3.4 to OFF (Window Tracking)
Window Tracking
was too slow.
SITRANS LR 400
reading is drifting
Sloped material
surface
Increase damping.
Symptom Possible causes Remedy