Siemens Milltronics BW500/L - Load Cell Balancing

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6.4 Load Cell Balancing
BW500 and BW500/L
Operating Instructions, 12/2016, A5E33482052-AD
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Select: 1 - Enter Value
Select: 2 - Enter Data
The program returns to P017.
Press The program advances through parameters P681
and P682 prompting entry of the total mass of all
the test weights used for SPAN calibration and
the average measured idler space before and
after the scale. From this data the test load is
calculated and automatically entered into P017
P017 Test Load: Weight MS 1 E
Enter test load
00.00
P681 Step 1: V
Total Mass of Test Weights 0.00 kg
Press
Units are selected in P004: metric, imperial.
For example: test load of 20.5
kg/m
P682 Step 2: V
Average Idler Space m
P017 Test Load: Weight MS 1 V
Enter test load 00.00
Note
For a two or three idler system, multiply the average idler space by the number of scale
idlers. For example, 1.5 m idler space with 2 scale idlers equals 3 m.
This value is calculated. For manual or automatic calculation, refer to P680. The test load value
should be less than the design load. If not, contact Siemens.
The initial programming requirements are now satisfied. To ensure proper entry of all critical
parameter values, return to P002 and review parameters through to P017.
6.4
Load Cell Balancing
Note
Load cell balancing is not required if the selected test reference is ECal (P002 = 3). In the
case of ECal, the load cells are balanced by the ECal procedure.
If you are operating a two or four load cell belt scale, it is recommended that the load cells be
balanced electronically prior to initial programming and calibration, or after either or both load
cells have been reinstalled or replaced.
Unbalanced load cells can adversely affect the performance of your belt conveyor weighing
system.
With the conveyor stopped and locked out, lift the belt off the weighing idlers.