Rice Lake CB-2 Concrete Batch Controller Version 2.0 - Manual (Page 66)

62 Installation/Operation Manual
10.3 Weighing Material Preact Configuration Parameters
Admin menu
Data bases
Materials
(Desired material)
Preacts
LEARN PREACT = OFF
PREACT WEIGHT BAND = Calibrated scale capacity / 10
LEVEL 1 thru 10 PREACT = (Please see description below)
10.3.1 Preacts - Hopper Scale
Admin menu
Data bases
Scales
(Desired scale)
SCALE TYPE = HOPPER
The preact value for a weigh hopper scale must vary with the batch size (hopper level). Concrete batching
systems batch size may vary from a fraction to multiple cubic yards or meters. The CB-2 “PREACT WEIGHT
BAND” parameter equals the calibrated scale capacity / 10. Example: 10,000 lb calibrated scale capacity / 10 =
1000. The CB-2 will associate preact values 1 thru 10 with scale target values
0-1000 lb., 9001-10000 lb. The lowest hopper level (smallest batch size) will be associated with the longest
“material in flight” time requiring the largest preact value. The following example represents the association
between preact weight band and possible preact levels.
PREACT WEIGHT BAND = 1000 (10,000 calibrated scale capacity / 10)
Table 10-1. Preact Level Values
Target Value Preact Level Preact Level Value
0000 - 1000 1 550
1001 - 2000 2 500
2001 - 3000 3 450
3001 - 4000 4 400
4001 - 5000 5 350
5001 - 6000 6 300
6001 - 7000 7 250
7001 - 8000 8 150
8001 - 9000 9 150
9001 - 10000 10 100
The preact level values will have to be determined for each material. Mix designs structured with one material
only containing target values ranging from low to high ran automatically with jogging turned off will determine
the preact level values. The amount over the target value should be entered for the appropriate preact level.