We have a new machine at work that is supposed to automatically weigh correct amounts of chemicals being dispensed in a bucket. The hoppers that dispense the chemicals use screw auger or vibratory feeders. The control has a coarse dosing and a fine dosing. The programmers are having difficulty getting the system tuned to work for all the different weights. For example, one recipe may require 1 lb of a certian chemical and another recipe may require 10 lbs.
They are trying to program the thing in percents, for example a 10lb weightment may work for 80% feed to 70% of the weight and 20% feed for 97% of the weight, and the inflight material makes up the other 3%. The programmers are wanting to save all 4 of these parameters for every weight for every chemical. Shouldn't this be scalable? I thought it might be better to set up coarse dosing to 70% fill at high speed and perhaps 97% at low speed. Perhaps low speed would be 20% of high speed and high speed would be proportional to the weight of the dosing.
Anyone here know rules of thumb or better algorithms for weightment control?
Thanks!
Roger_N