Actual Weight
---------------- x Current Speed Value = New Speed Value
Target Weight
So... if the Target is 100-lbs and the Actual is 80-lbs then the Speed Value is reduced to 80% of the Current Speed Value. The box was not filled enough so you slow down the speed of.... what?
You said that you...
"...send the new value to the drive to speed up or slow down the machine. Changing the machine speed increases or decreases the amount of product in the container (time fill machine)."
So... by "changing the machine speed" are you changing...
The filler feed-speed?
This would be the speed of the product material as it is fed into the box.
Or, the speed of the box as it moves by the filler?
In this case, the filler is feeding material constantly while the box moves by under the feed discharge. Slower equals more while faster equals less.
Are you trying to control the speed of the walking beam?
If the workers can turn the box around...
Aaahhhh... Could it be...
(so many conflicting pieces of information...)
You say it's a "time-fill machine".
Is it the case that the walking beam carries a box into the filler area? Once the box is in the fill area the feeder begins feeding for x-seconds. (You must have an Eye or something to say "Feed me, Seymour!")
Meanwhile the walking-beam keeps right on walking. It might take two or three steps to move the box through the filler area. The timer on the filler stops the filler before the box leaves the area. This would help reduce spillage, I should think.
Then, at some point the box is transfered onto a conveyor which brings the box to the load cell where the box is weighed.
And so... are you really trying to control the "dwell-time", that is, the time that the box stays in the feed area.
No... that can't be right.
If the feed is timed then no matter how slow the beam walks, only so much material is gonna load.
If the beam walks faster than you end up with spillage as the box leaves the area before the fill is done.
You gotta be trying to synchronize the fill timer with the walk-beam speed...
(Reverse Engineering! What a Hoot! ...sometimes.)