The
“A to D” fault means that two identical Analogue to Digital conversions produced
the same count number. Normally this would be impossible unless the Analogue to
Digital (A to D) converter is faulty or the voltage readings from the scale
base is outside the range of the A to D converter.
Corrective
actions
Disconnect the load cell cable from the back of the indicator, turn
the indicator off and back on again. Does the A to D fault go away? Try
connecting the operator panel to another scale base and check for the A to D
fault message. If the Operator panel works with another scale base, without
faulting with “A to D fault”, then this indicates that the signal voltage from
the scale base is outside the A to D range.
If
the fault is traced to the scale base as described above, then check that the
load cell cable from the operator panel to scale base junction box is not cut
or crushed (a crushed cable can cause the internal wires to short out). Swapping this cable between scale bases can
be used to check the cable if suspected.
Also
check that no wires have been caught between the edge of the metal junction box
and the scale frame causing a short circuit. Also measure the voltage between the green and
white wires (signal wires for the four load cells), which voltage should not be
greater than 10 mV.
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