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6.3
Adjustment and initial commissioning
Missing type of protection and loss of approval
If the load cell is not operated with an intrinsically safe power supply, the type of protection -
intrinsically safe is no longer guaranteed and the intrinsically safe approval may be revoked.
Permanently erase, therefore, the irrelevant types of protection on the rating plate before
commissioning, so that erroneous deployment can be avoided.
6.3.1
Height compensation
6.3.1.1
When is height compensation necessary?
If you are using up to three load cells, all the load cells will always be under load. Height
compensation is not necessary in this case.
When an elastic base or elastic foundations are used, the height from the base or foundations
is compensated. Height compensation is not necessary in this case.
For more than three load cells or support points, the load bearing is statically indeterminate.
When the foundation and the base are rigid, the total weight can load two diagonally mounted
load cells and cause overloading of the load cells. Height compensation is necessary in this case.
6.3.1.2
Procedure for height compensation
Determining the load on the load cells
1. Bring the force transfer points to the same height.
The output signals for all load cells should be approximately identical when the load is evenly
distributed; and they will indicate the load distribution in the case of uneven distribution.
2. Measure the loading on the load cells as follows:
– Disconnect the load cell cables SIG+ and SIG-.
– Connect the supply voltage, e.g. 10.2 V, to the load cells.
– Measure the output voltages between SIG+ and SIG- for the individual load cells.
3. Determine which load cell has the lowest output voltage.
Height compensation of the load cells
1. Insert as many distance plates underneath the load cell with the lowest value as necessary
to equalize the output voltages.
SIWAREX WL200
Operating Instructions, 04/2021, A5E02199611B-12
WARNING
6.3 Adjustment and initial commissioning
Commissioning
37
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