User's Manual

Page 64 Sitrans LR 400 – INSTRUCTION MANUAL 7ML19985FH01
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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)
which occur. It indicates the device function status in which the fault occurred and
outputs an fault message in plain text.
The possible fault messages are as follows:
1. Make the following modifications, starting with
a. Check whether the fault still occurs after every step:
b. Check the set measuring range and the dead band (Function 4.2.2.3).
c. Check whether the filling speed has been correctly set (Function 4.2.2.5).
d. Reduce the reflectivity (Function 4.2.2.6).
e. Switch off the automatic fixed target detection (Function 4.2.3.6) if necessary.
f. Switch off the multiple echo detection (Function 4.2.3.2) if necessary.
Function Message Possible causes Remedy
Sensor
MW cable
defective
Microwave cable not connected or line
break
Contact your Siemens
Milltronics
representative
Sensor
defective
Overtemperature in device
Contact your Siemens
Milltronics
representative
Check antenna
Antenna contaminated, damaged or not
mounted
Check the antenna
Sensor too hot Sensor temperature exceeds 85 °C
Check the max.
permissible ambient
and flange temperature
Electronics all messages Internal fault
Contact your Siemens
Milltronics
representative
Software all messages Internal fault
Contact your Siemens
Milltronics
representative
Application
No valid meas.
value
fault in fixed target detection, fault in
multiple echo detection, poorly
reflecting measuring medium
1
Tank empty
detected
vessel is empty (only when sensor
parameter “vessel empty detection”
active)
Deactivate vessel
empty detection if
necessary
false param.
incompatible parameters entered,
e. g.: URV = LRV
Correct the parameters
listed in the next
function
Parameters
<Parameter to
be corrected>
False parameterization
Perform the correction
as indicated
Service (various)
For service personnel
only
chap7.fm Page 64 Tuesday, October 9, 2001 1:06 PM