Rice Lake SURVIVOR OTR Steel Deck - Manual (Page 30)

26 OTR Truck Scale Assembly Instructions
8.0 Trimming and Calibration
The following section provides descriptions and procedures for load cell trimming, scale calibration and serial tag
placement.
8.1 Overview and Equipment Required
Load Cell Trimming
Individual load cell signal trimming (equalizing the signal output from each load cell) must be done first along
each side of the scale so all cells on a side have equal signal output. Adjustments are somewhat interactive, so each
side should be done at least twice.
Once that is done, load cell pairs - one from each side - are trimmed as paired sections until each sectional output is
equal. adjustments to each section should also be done at least twice.
Figure 8-1. Load Cell Trimming Diagram
Equipment Required
Both of these trimming operations can be done using a weight cart parked in various locations on the scale. Final
verification of equal output trimming, however, requires test weights to be placed on the deck in various locations.
8.2 Trimming Individual Cells
Connect all load cells to the summing board terminals in the J-box, and connect the main interface cable from the
J-box to the indicator. Power up the indicator.
Turn all load cell potentiometers (individual and section) in the J-box clockwise so all signal are at full strength.
Refer to the J-box instruction manual for proper setup of jumpers and dip switches prior to trimming, then proceed
to individual cell trimming.
Side 1
The first objective is to adjust individual load cells along one side of the scale for equal signal output when equal
weight is put on those cells. For convenience, that side of the scale is referred to as Side 1. The trimming weight
you use is the loaded weight cart.
1 4 3 2
8 5 6 7
1st – Trim Side 1 Cells (1, 2, 3, 4)
2nd – Trim Side 2 Cells (5, 6, 7, 8)
3rd – Trim Sections
(1,8; 2,7; 3,6; 4,5)
Weight
Cart
Junction Box