Most industrial load cells are used in multiple load cell weighing systems. Load cells should beelectrically connected in such a way that the signal (output) lines, excitation (power supply) and sense(when present) lines are in parallel. Usually the connection is not made at the indicator, but in aseparate housing, a so called junction box, located adjacent to the weighing system.
With 4-wire extension cables the load cell output should be connected to pairs of diagonally oppositewires.Sometimes it is necessary to trim the output of each individual load cell to avoid corner loaddifferences, which are caused by: the parallel connection. Each load cell will be loaded with the resistance of the other load cells. As a result, the individual load cell output tolerances will be increased by the individual outputresistance tolerance unequal load distribution.Trimming can be done by placing resistors or variable resistors into the excitation (Excitation trim) oroutput (signal trim) lines. All load cells should be placed on the same horizontal level. Check formechanical unequal load conditions before trimming the load cells!
