SITRANS LUT400
276 Operating Instructions, 07/2019, A5E33329501-AC
No response when echo
profile requested via LUI
(Echo Profile (3.2.1.)
Transducer is disabled. Set Transducer Enable (3.3.1.) (Page 245) to
ENABLED, then request an echo profile.
Configuration error 130
displayed
Relay/pump configuration
errors - possible causes
include:
• A relay is assigned to
more than one function
(e.g. relay 2 is as-
signed to both an ex-
ternal totalizer and a
pump).
• Pump setpoints are
out of order.
• Wall Cling adjustment
range is too large.
• Verify that each relay is assigned to one
function only. Review relay assignments
under Pumps (2.7.) (Page 184) and Other
Control (2.11.) (Page 212).
• Verify that all ’ON’ setpoints are greater
than their respective ’OFF’ setpoints for
pump down applications (or vice versa for
pump up applications).
• Ensure range set in Level Setpoint Varia-
tion (2.7.2.1.2) (Page 188) has not caused
’ON’ or ’OFF’ setpoints to overlap.
Echo profile request
results in an error icon
that displays for 5 sec-
onds before returning to
the echo profile request
Another external commu-
nication is trying to access
an echo profile at the
same time.
Wait for several seconds and then retry the
echo profile request, or disconnect / disable
any external communications that may be
requesting an echo profile.
Data log files are empty
or logging has stopped.
• Data Logging is not
enabled.
• USB extension cable
has been used (alt-
hough may not cur-
rently be connected).
• Verify that Data Logging is enabled. See
Data Logging (2.10.) (Page 210).
• If a USB extension cable has been used
(remove if currently connected), a power
reset of the device is required to restart
Data Logging.
11.5 Noise Problems
Incorrect readings can be the result of noise problems, either acoustic or electrical, in the
application.
The noise present at the input to the ultrasonic receiver can be determined by viewing the
echo profile locally via the LUI, or alternatively, using remote software such as SIMATIC
PDM, AMS Device Manager, FC375/475, or DTM. View also parameters Noise Average
3.2.9.4.) (Page 245) and Noise Peak (3.2.9.5.) (Page 245). In general, the most useful value
is the average noise.
With no transducer attached the noise is under 5 dB. This is often called the noise floor. If
the value with a transducer attached is greater than 5 dB, signal processing problems can
occur. High noise decreases the maximum distance that can be measured. The exact
relationship between noise and maximum distance is dependent on the transducer type and
the material being measured. An average noise level greater than 30 dB may be cause for
concern if the installed transducers maximum operation range matches the range of the
application (e.g. 8 m application using an 8 m XRS-5). Using a larger transducer with greater
transmitted energy should help to improve performance in a noise condition.
To Next Page
Loading...
