Model 672/675 Technical Reference Manual
4-13
PREVENTING DOUBLE ACCUMULATIONS
Double accumulations occur when the same load is added to the accumulation totals more than once. This
potential problem can be eliminated by properly setting the Return-to-Zero setup parameter (P122 RTZ).
The RTZ parameter mandates that the applied gross weight fall below a predetermined value before the
next accumulation may occur. If the weight is not removed, “CLEAR WGHT!” is displayed indicating that an
accumulation can not occur.
As an example, suppose we are accumulating the weight of aluminum cans on a 100 pound capacity scale.
The cans are dumped into a container that has been tared on the scale, then accumulated. The container is
emptied, refilled and accumulated again just before the change of a work shift. A new worker arrives at the
same station to find a container full of cans and attempts to perform an accumulation. The display prompts
“CLEAR WGHT!” indicating that these cans have already been accumulated. Assuming we had set P122 to
a 1% Return-to-Zero value, the GROSS weight must fall below 1 pound before the next accumulation can
occur.
Note that if P122 was set to 100%, a double accumulation would have occurred and the same cans would
have been counted twice.
ACCUMULATION COUNTER
Operating parameter 9, accumulation counter, is incremented by one (1) each time after every
accumulation. This parameter tells us how many accumulations have occurred. This can be useful to
determine the average weight of each weighment. For example, the macro assignment
80.1P=3.0P/9.0P%o
divides the GROSS TOTAL of the currently selected scale by the NUMBER OF ACCUMULATIONS and
assigns the average to variable #1.
The value of P9 cannot be preset manually. It is reset (set to zero) any time either the GROSS TOTAL or
the NET TOTAL parameter is reset or initialized manually. It can, however, be assigned a value with a
macro assignment
9.1P=10%o
LARGE ACCUMULATION VALUES
As the GROSS TOTAL or NET TOTAL increases, the number of decimal places will change to
accommodate the number on the 6 digit display. For example, a value of 9999.00 may be displayed exactly
as that number. Yet a value of 99999.00 will be displayed as 99999.0 (one decimal place is lost). When an
accumulation value exceeds 999,999 it can not be represented on the 6 digit display. Instead, “Code04
Num > Dsply” is displayed. The actual value is still retained and may be transmitted to another display or
printer.
ACCUMULATIONS AND NTEP
It should be noted that enabling setup parameter 440, NTEP, has several significant effects on the operation
of the accumulation parameters. When using the accumulation feature in a legal-for-trade application these
effects should be studied. Refer to page 6-2 for more details.
M
ULTI
-R
ANGE
Multi-Range operation allows the scale's division size to change as weight increases. Two or three ranges
can be specified. This feature is useful for weighing different sized parts.
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