Norac UC4+ - Page 45

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8.2.5
• Sensor not working: Displaying "###" or " -## " (too high or low)
Possible Cause(s) Suggested Solution(s)
a) Boom section is too
high ("###").
a) Lower the boom section.
NOTE: The sensor is reporting a reading that has too
many digits to display on the LCD screen.
When the boom returns to normal heights, the
reading should reappear on the screen.
b) Sensor Zero Height
setting is incorrect
b) Check the sensor “Zero Height”. Calibrate,
if necessary.
NOTE: Refer to Section 6.3.1 Calibrating the Sensor’s
Height Reading in the UC4+ Operators
Manual.
NOTE: This symptom may occur when sensors have
been “swapped” from different mounting
locations.
c) Sensor is facing very
strong sonic targets
(e.g. concrete)
NOTE:
This may cause measurement
errors, flashing from a valid
height reading to "0","###"
or "-##"
c) Try a different/adequate target.
8.2.6 Sensor Swapping
Swapping Sensors is a useful procedure for determining whether a
sensor error message (e.g. "LO NR") is due to the sensor or the wiring
to the sensor.
NOTE: A sensor may have power and emit a ticking sound, but have broken communication
wire(s), which would cause this error. Performing Sensor Swapping would help
determining the cause.
The procedure is as follows:
i) Exchange the affected sensor with one that is reporting correctly
(e.g. "LO" and "RO").
ii) Swap (input) their respective location serial numbers into the
control panel (Section 6.3.1).
iii) If the problem still exists in the same location, the wiring from
that branch may have a fault.
iv) If the error appears in the new location, the sensor may not be
functioning properly.