Fault Messages - Siemens sitrans LR 400 Instruction Manual

Symptom
No measured value
appears after the
Auto-Setup
(measured value 0 and
the fault display
flashes)
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.

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
• M: Maintenance fault – maintenance required or demanded. See maintenance
parameters (Parameters 6.x).
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. The possible fault messages are described on the next page.
Possible fault messages:
Message
MW cable Faulty or damaged microwave
defect cable
Faulty or damaged high
Sensor defect
frequency antenna
Check antenna Dirty high frequency antenna
Sensor temperature above
Sensor too hot
85 °C(185 °F)
7ML19985JC02
Possible causes
Internal fault
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 Aim SITRANS LR 400 using Easy Aimer ball.
Damping too high
Window Tracking
was too slow.
Possible causes
SITRANS LR 400 (Solids) – INSTRUCTION MANUAL
Remedy
Call the fault display in Parameter 3.1.
Proceed as described in Antenna Maintenance on
page 75.
Clean antenna or order an optional PTFE dust
cover.
Shorten nozzle or lower position of SITRANS
LR 400.
Use 4.2.3.8 and 4.2.3.9 Auto False-Echo
Suppression function
Set 4.2.3.2 Multiple Echo Tracking to ON. Try using
Liquid Store application type 4.2.2.1.
Decrease 4.2.3.1 Sensor Damping
Decrease Level Damping
Set 4.2.3.4 to OFF (Window Tracking)
Sensor
Repair required: contact your local Siemens
representative.
Repair required: contact your local Siemens
representative.
Inspect antenna for contamination; clean if
possible.
Reduce ambient temperature surrounding the
device enclosure or reduce process
temperature. Inspect sensor for damage and if
necessary, contact your local Siemens
representative.
Remedy
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