Troubleshooting Guide - Siemens sitrans LU10 Instruction Manual

Troubleshooting Guide

SYMPTOM
Display blank, Transmit Neon
not flashing, transducer not
pulsing
No response to programmer
Displays "Short" and "tb:(#)"
Displays "Open" and "tb:(#)"
Displays "Error" and "tb:(#)"
Displays "LOE"
Displays "EEEE"
Displays "EEEPrO"
Reading fluctuates while
material level is still, (or vice
versa)
Reading is fixed, regardless of
the actual material level
Material level reported is
always "off" by the same
amount
Measurement accuracy
improves as level nears trans-
ducer
Reading is erratic, with little or
no relation to material level
7ML19985AN02
CAUSE
No power
Obstructed infrared interface, or
defective programmer
Short circuited transducer cable,
or defective transducer
Transducer not connected
Open circuited transducer cable,
or defective transducer
Transducer connected wrong
Wrong Transducer (P004)
Weak or non-existent echo
Reading too high
Faulty EEPrOM memory chip
Incorrect measurement stabiliza-
tion
Transducer beam obstructed,
standpipe too narrow, or trans-
ducer mounting resonant
Incorrect Empty (zero) reference
Incorrect Sound Velocity used for
distance calculation
True echo too weak or wrong
echo being processed
SITRANS LU10 – INSTRUCTION MANUAL
ACTION
Check power supply, wiring and
voltage selection switch.
Clean enclosure "docking bay" and
programmer magnet slot.
Repair or replace as necessary.
Connect transducer, or remove
Point # from service (P001=0).
Repair or replace as necessary.
Reverse BLK and WHT wires.
Enter correct value.
Relocate and / or reaim trans-
ducer at material level or object.
Proceed to "Measurement Diffi-
culties", (following page).
Select larger Units (P005), or
lower Convert Reading (P061).
Return to factory for repair or
replacement.
Alter Measurement Response
(P003) accordingly.
Technical Reference
See
surement Response.
Relocate and / or reaim trans-
ducer at material level or object.
Proceed to "Measurement Diffi-
culties", (following page).
See Empty (P006),Reading Offset
(P063), Offset Calibration (P650), &
Offset Correction (P652).
Use an ultrasonic / temperature
transducer or a TS-3 temperature
sensor.
Technical Reference
See
Velocity.
Relocate and / or reaim trans-
ducer at material level or object.
Proceed to Measurement Difficul-
ties.
Mea-
Sound
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