Rice-lake Counterpart Configurable Counting Indicator - Inst User Manual download pdf (Page 65)

Scale Operations 59

5.0 Scale Operations

The following contains detailed operator instructions for Counterpart, including instructions on how to enter tare

weights, toggle between net and gross weight, enter unit weights, perform inventory accumulation and reduction,

and toggle between scales. All operator instructions are conducted with the scale in the operation mode that is the

weighing or normal mode.

Counting scale accuracy is determined by:

• Sample size (number of pieces)

• Total sample size as a percentage of full scale capacity

• Piece-to-piece weight variation

As a general rule when determining sample size of fairly uniform pieces, the larger the sample size, the greater the

total sample weight, and therefore, the better the counting accuracy. Selecting the smallest capacity scale that can

obtain the highest counting resolution should be considered, but should not sacrifice the capacity required for the

heaviest container of parts. For this kind of application, a dual-platform scale may be the best selection. There is a

direct relationship between piece-to-piece weight variation (non-uniformity) and counting accuracy.

Therefore, elimination of the piece-to-piece weight variations can be accomplished by:

1. Isolating the sample used to calculate the unit weight and using the same sample to re-check the scale.

2. Recalculating the unit weight from lot-to-lot of parts. Parts manufactured on one machine may vary

slightly from another machine relative to weight.

3. Tightening the manufacturing tolerances on the parts reduces piece weight variations and increases count

accuracy.

The Stand-by Screen

At the stand-by screen the WEIGHT, UNIT WEIGHT, and QUANTITY displays show zeros and the annunciator for the

platform is illuminated (Scale 1 or 2).

5.1 Weight Unit Switching

The weight units displayed can be changed between primary, secondary and tertiary units during weighing

operations by pressing the

UNITS TOGGLE key.

5.2 Entering Tare Weights

Tare weights can be entered in the scale by one of two methods: one-touch tare or digital tare. Digital tare is used

when the tare weight is already known while one-touch tare is used when the tare weight is unknown. If you call up

an Item Code already programmed into the Counterpart memory and you have a tare weight stored for that Item

Code, the tare weight stored with the Item Code will override one entered digitally or by using the

TARE key.

5.2.1 One-Touch Tare, Tare Unknown

1. If the tare weight value is not known, place the item to be tared on the scale and press TARE . The weight

display should now show 0 and the Net annunciator should illuminate.

2. Remove the item from the scale. The weight display should show a negative weight value (weight of the

tared container, box, or item).

3. To clear the tare weight, press TARE with no weight on the scale. The scale should be at gross zero. The Net

annunciator will no longer be illuminated.

5.2.2 Digital Tare, Tare Weight Known

1. If the tare weight value is known, use the numeric keypad to key in the value and then press TARE. The Net

annunciator will illuminate.

2. To reset the tare to zero, press TARE again with no weight on the scale while the scale is at gross zero and

the Zero annunciator is lit.

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Rice-lake Counterpart Configurable Counting Indicator - Inst User Manual Page 65

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