Many applications such as multiple dump batching systems, axle weighing systems, and inventory control require accumulation of weight values. The 60 Series accumulation parameters provide an easy method for totalizing multiple weighments. Separate accumulation parameters are maintained for GROSS and NET weights for each enabled scale.
Before attempting an accumulation, either the GROSS parameter (0.0P), GROSS TOTAL parameter (3.0P), NET parameter (1.0P) or NET TOTAL parameter (6.0P) must be selected. An accumulation may then be performed by placing a load on the scale and pressing [ . ] [ENTER].
Accumulations are motion inhibited, meaning the accumulation will not occur until the scale becomes stable within the limits defined at setup parameter 114 (motion divisions) and parameter 115 (motion time delay). Mot’n Delay is displayed while the scale is unstable.
Once the scale becomes stable, all accumulation parameters for both GROSS and NET are updated.
Resetting and Initializing Accumulation Parameters Manually
Accumulation parameters are stored in non-volatile memory, saving their values during power loss so that accumulations can resume when power is restored.
To reset accumulation parameters, select either the GROSS TOTAL or NET TOTAL parameter and press [CLR]. The display prompts ENTER =CLR!. Press [ENTER] to confirm. All accumulation parameters are reset to zero (0).
To initialize accumulation parameters, select either the GROSS TOTAL or NET TOTAL parameter, key in the desired total and press [ENTER]. The display prompts ENTER =New!. Press [ENTER] again to confirm. Only the selected parameter is initialized, the other remains unchanged. The NUMBER OF ACCUMULATIONS parameter is reset regardless of which parameter is initialized.
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 Return-to-Zero 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.
Operating parameter 9, accumulation counter, is incremented by one (1) each time after every accumulation. This parameter tell us how many accumulations have occurred. This can be useful to determine the average weight of each weighment. For example, the macro assignment:
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 can not 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:
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 of the M660. 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 at least be noted here 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.