Fault Messages - Siemens sitrans LR 400 Instruction Manual

Symptom
An incorrect
measured value
appears after Auto-
Setup.
No measured value
appears after the
Auto-Setup
(measured value 0 and
the fault display
flashes)
Material movement
but output remains
constant
SITRANS LR 400 reads
100% continually.
SITRANS LR 400
reading stays above
actual level
SITRANS LR 400 reads
low or empty when
material level is high
SITRANS LR 400
reading is too slow.
Optical Keypad
doesn't function
SITRANS LR 400
reading is drifting

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
occured. It indicates the device function status in which the fault occurred and outputs an
fault message in plain text.
7ML19985FH03
Possible causes
The device is not
parameterized
correctly according to
the application
Internal fault
Varying signal moves
out of tracking
window too
frequently.
Check antenna for
material buildup.
Nozzle interference,
or end of horn is not
inside vessel
False echo from
vessel (fixed
obstruction)
Multiple or indirect
echo detected
instead of first echo.
Highly sloped surface
Damping too high
Wndow Tracking was
too slow.
Poor reflection from
fingers
Alignment problem
with glass window
Defective keypad
Sloped material
surface
SITRANS LR 400 – INSTRUCTION MANUAL
Remedy
Set the device parameters and functions
manually.
Call the fault display in Function 3.1.
Proceed as described in Maintenance on page 69.
Set Window Tracking( 4.2.3.4) to OFF.
Clean antenna or order a purge (self-cleaning) kit.
Shorten nozzle or lower position of SITRANS
LR 400.
Use 4.2.3.8 and 4.2.3.9 Auto False Echo
Suppressions function
Set 4.2.3.2 Multiple Echo Tracking to ON. Try using
Liquid Store application type 4.2.2.1.
Aim the SITRANS LR 400 using shims or order an
Easy Aimer kit. Contact your Siemens
representative for service and possible User
parameter support.
Decrease 4.2.3.1 Sensor Damping
Decrease Level Damping
Set 4.2.3.4 to OFF (Window Tracking)
Try using a white object, like a business card.
Open cover and try optical elements with cover
removed.
Return for replacement.
Increase damping.
Page 67