Fault Messages - Siemens Sitrans LR400 Instruction Manual

Symptom
No measured value
appears after the
Auto-Setup
(measured value 0 and
the fault display
flashes)
SITRANS LR400 reads
100% continually.
SITRANS LR400
reading stays above
actual level
SITRANS LR400 reads
low or empty when
material level is high
SITRANS LR400
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 below.
Possible fault messages:
Message
MW cable
Faulty or damaged microwave cable
defect
Faulty or damaged high frequency
Sensor defect
antenna
Check antenna Dirty high frequency antenna
Sensor too hot Sensor temperature above 85 °C(185 °F)
Page 82 SITRANS LR400 (7ML5421) – INSTRUCTION MANUAL
Possible causes
Call the fault display in Parameter 3.1.
Internal fault Proceed as described in Antenna Maintenance on
page 86.
Check antenna for Clean antenna or order an optional PTFE dust
material buildup. cover.
Nozzle interference,
Shorten nozzle or lower position of SITRANS
or end of horn is not
LR400.
inside vessel
False echo from
Use 4.2.3.8 and 4.2.3.9 Auto False-Echo
vessel (fixed
Suppression function
obstruction)
Multiple or indirect
Set 4.2.3.2 Multiple Echo Tracking to ON. Try using
echo detected
Liquid Store application type 4.2.2.1.
instead of first echo.
Highly sloped surface Aim SITRANS LR400 using Easy Aimer ball.
Damping too high
Decrease 4.2.3.1 Sensor Damping
Decrease Level Damping
Window Tracking
Set 4.2.3.4 to OFF (Window Tracking)
was too slow.
Possible causes
Sensor
Remedy
Remedy
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.
7ML19985FH06