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ARMOR Digital Truck Scale with SMARTCELL Load Cells
When used on a digital truck scale, the NEST will perform tests on the digital load cells, the
load cell cables, and the homerun cable.
On a digital load cell, the NEST will test both communication loops, the analog section, and
check the load cell for internal drift. In addition, it will display the milliamps current the load cell
is pulling. When the load cell test has completed, it will display Pass or Fail on the screen.
The NEST will conduct a voltage test on the load cell and homerun cables. The cable test can
be performed in an automatic mode or a manual testing mode. When started, the automatic
test mode steps through each voltage level continuously until stopped by the technician. The
manual mode, allows the technician to step through the voltage levels and observe the test
voltage and voltage drop across the cable.
Both cable test modes will display a Pass or Fail result on the screen.
ARMOR Truck Scale with Analog Load Cells
On a
Cardinal Armor truck
scale with junction boxes and analog load cells,
the NEST plugs
directly into the trim board of a scale universal section seal trim box and displays millivolts and
pounds readings for up to 12 load cells and the reading from the junction box summing
circuitry.
In addition, the NEST can provide a millivolt output signal for the home run cable to
the digital weight indicator's analog input.
There are two units of display: millivolts or pounds. The pounds display is a rough
approximation of the weight corresponding to the millivolts reading. At start up, the NEST
assumes the load cells have rated capacity of 75000 lb and rated output of 2 mV/V. It may be
necessary to change the cell parameters to match the scale being tested. See the ANALOG
SCALE DIAGNOSTICS section, CELLS KEY in the KEYPAD FUNCTIONS section to see how
to change the load cell parameters.
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4400-0020-0M Rev C 225NEST Operation
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