Adjustments and Calibration 9
3.0 Adjustments and Calibration
The following sections describe adjustments that need to be made to the Summit 3000 floor scale.
3.1 Mechanical Adjustments
To accommodate minor floor unevenness, the scale feet can be used to adjust scale height up or down. Adjust the
feet by hand (lift the scale corner slightly with a pry bar) until all feet are contacting the floor equally. Jam nuts
are supplied for locking the feet, as there is a slight decrease in accuracy when jam nuts are tightened. However,
if the application requires securing the feet, it’s suggested to use Teflon
®
tape or Loctite
®
.
When adjusting scale feet, use care to prevent the scale foot from bottoming out against the underside of the load cell.
Also, the foot stem can be damaged by bending or stripping threads if extended beyond the maximum height adjustment.
When height adjustments are complete, recheck level of the deck with a spirit level. The deck must be level
within 1/4 inch (6.4 mm).
3.2 Corner Correction
All assembled Summit 3000 scales are delivered with the junction box corner-trimmed. Corner trimming is only
necessary after replacing a load cell.
To calibrate the scale, the output from each load cell must be matched by adjusting the signals with
potentiometers at the junction box—a process known as trimming.
1. Remove the junction box cover and identify the correct load cell terminal corresponding to each corner
(labeled CELL 1, CELL 2, CELL 3 and CELL 4). See Figure 4-3 on page 13 for scale deck corner
numbering.
The indicator must be connected and calibrated, but it does not need to indicate the exact weight value. A
test weight is required. The recommended test weight for all Summit 3000 models is 25% of scale
capacity: for example, 500 lb for 2000 lb models, 2500 lb for 10,000 lb models.
Figure 3-1. Summing Board Diagram
Potentiometers
Cell 1
Cell 4
Cell 2
Cell 3
Indicator
Corner Numbering
Teflon
®
and Loctite
®
are both registered trademarks of E.I. DuPont.
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