New HIDS Drum Scales!
Click Here to Learn More!There are a few questions and answers available in Hardy's online WebTech knowledge base that addresses this question, and the answer depends on the action desired.
Net weight is zeroed (tared) by pressing the tare button when the scale is out of motion. There is no limit on the amount of weight that can be tared. Only it must be a positive value in reference to the current gross weight value
Gross weight is zeroed by pressing the ZERO button on the front display. This zero command is limited by the zero tolerance parameter in the setup.
The auto zero is the limit of the gross weight that can be zeroed from a host communications and auto zero tracking.
The traditional Hard Calibration process reference zero sets the gross zero. The scale must be empty and this can not be used without doing the SPAN portion of the calibration routine. Newer Hardy weight controllers allow you to use the calibration zero to adjust for chain pulls and other calibration tool weights. The zero function of the HI 2100 series only changes the number of zero counts and does not recalculates the calibration slope for SPAN.
If there has been a large change in dead load of the empty vessel it is better to re-calibrate the vessel. (An example would be if a motor was changed that was a different weight than the original.)
Most of the time if the scale cannot be zeroed it is indicating there is a mechanical or electrical reason that must be investigated.
NOTE: Care should be taken in setting up the unit if auto zero tracking is to be used. The HI 2151/30 and the HI 2110WI units will save data to the SMM every time the zero, tare or auto zero functions are run. This raises the potential to reach or exceed the maximum one million writes capability of the SMM. If this happens, there us a potential chance of having corrupted data written into the unit at power up.
This problem was resolved September, 2010 with a new black 0519-0512-06 SMM design. This new SMM is included on all the new HI2100 (Not used in the HI 3000 series) weight controllers manufactured after that date and is physically longer than the original SMM. A replacement SMM may be ordered from the Hardy Service Center or your local Hardy Sales Representative. The HI3000 series weight controllers will continue to ues the original 512 tan 0519-0512-01 SMM.
Re-calibrating a scale will not solve a zero shift and should never be used to correct a scale problem.
Read the other Web tech tips on troubleshooting load cells for additional information.
