Siemens sitrans LU01 - Manual (Page 105)

7ML19985BE02 SITRANS LU01 – INSTRUCTION MANUAL Page 99
mmm
mm
Tr
oubl
esho
ot
ing
Troubleshooting Guide
Symptom Cause Action
Display blank, Transmit
Neon not flashing, trans-
ducer not pulsing
No power
Check Power supply, wiring, and volt-
age switch.
No response to pro-
grammer.
Obstructed infrared inter-
face, or defective program-
mer
Clean enclosure “docking bay” and
programmer magnet slot.
Displays “Short” and
“tb:(#)”.
Short circuited transducer
cable or defective trans-
ducer.
Repair or replace as necessary.
Displays “Open” and
“tb:(#)”.
Transducer not connected
Connect transducer, or remove Point #
from service (P001=0).
Open circuited transducer
cable, or defective trans-
ducer.
Repair or replace as necessary
Displays “Error” and
“tb:(#)”. Transducer connected
wrong
Reverse BLK and WHT wires
Wrong transducer (P004) Enter correct value
Displays “LOE”. Weak or non-existent echo.
Relocate and/or re-aim transducer at
material level or object.
Proceed to Measurement Difficulties.
Displays “EEEE”. Reading too high.
Select larger Units (P005), or lower
Convert Reading (P061).
Reading fluctuates while
material level is still, (or
vice versa).
Incorrect measurement sta-
bilization.
Alter measurement Response (P003)
accordingly.
See Technical Reference / Measure-
ment Response.
Reading is fixed, regard-
less of the actual mate-
rial level.
Transducer beam
obstructed, standpipe too
narrow, or transducer
mounting resonant.
Relocate and/or re-aim transducer at
material level or object
Proceed to Measurement Difficulties.
Material level reported
is always “off” by the
same amount.
Incorrect Empty (zero) refer-
ence.
See Empty (P006), Reading Offset
(P063), Offset Calibration (P650), and
Offset Correction (P652).
Measurement accuracy
improves as level nears
transducer. Incorrect Sound Velocity
used for distance calcula-
tion.
use an ultrasonic/temperature trans-
ducer or a TS-3 temperature sensor.
See Technical Reference Sound Veloc-
ity.
Reading is erratic, with
little or no relation to
material level. True echo too weak or
wrong echo being pro-
cessed. Relocate and/or re-aim transducer at
material level or object
Proceed to Measurement Difficulties.