User's Manual

7ML19985FH04 SITRANS LR 400 – INSTRUCTION MANUAL Page 77
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Troubleshooting
Possible fault messages:
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 deadband (Parameter 4.2.2.3).
c. Check whether the filling speed has been correctly set (Parameter 4.2.2.5).
d. Reduce the reflectivity (Parameter 4.2.2.6).
e. Switch off the automatic fixed target detection (Parameter 4.2.3.6) if necessary.
f. Switch off the multiple echo detection (Parameter 4.2.3.2) if necessary.
Unit Repair and Excluded Liability
All changes and repairs must be done by qualified personnel and applicable safety
regulations must be followed. Please note the following:
• The user is responsible for all changes and repairs made to the device.
• All new components must be provided by Siemens Milltronics Process
Instruments Inc.
• Restrict repair to faulty components only
• Do not re-use faulty components.
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 process
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 (see below)
Tank e mpt y
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