Why doesn't my HI 3010 register all of the fill material on the scale?

Why doesn't my HI 3010 register all of the fill material on the scale? If a fill cycle is started, and for some reason weight is applied to the scale before the OK To Fill Signal is given, when the OK To Fill signal goes true the scale is zeroed even though Use Auto Zero is off. Consequently, discharge is over when the scale reaches its Auto Zero point.

For example, I have the scale calibrated for 0 - 100 lb. I press start and "Waiting On" is displayed. If during this time I add 50 lb to the scale, it will now read 50/50. I then apply the OK to Fill signal and the display reads 0/50. I then add 50 lb to the scale and it reads 50/100 and awaiting OK To discharge comes on. I remove 50 lb from the scale and it reads 0/50. There is still 50 lb on the scale.

The issues you described are related to auto zero tolerance and tare. Zero Tolerance is only used to determine if the discharge is complete. It checks to see if the hopper has discharged to within that zero amount to indicate that discharge is complete. The Auto Zero tolerance concerns the gross weight of the empty scale. There could be some build up from a prior fill and this gross weight is automatically zeroed as an accumulated amount.

When you place a weight on the zeroed empty scale and press start, or the OK to fill is activated, and your scale is out of motion,  the scale is tared. The net weight is set to zero for the fill operation. The amount of weight you can tare is limited by the tare limit that should be set to a value slightly higher than an empty box. That way if a fill is started and stopped with a small amount of material in the box, it will be able to display there is to much weight on the scale to start.

You can monitor the net or gross weight on the front display and web page, but the fill operation is only ruled by the NET weight. To stop early starts, before the bag and handling is finished, a smaller motion tolerance can be set. The motion tolerance rule is total load cell capacity times 0.03%. This is only three times a stable weight reading level, and verifies all excess movement is stopped before an accurate net zero is declared. You may have the motion tolerance set so high you are always out of motion.