Siemens SIWAREX WL280, Руководство по эксплуатации, Страница: 37 / 58

Mounting
5.2 Installing the compact installation unit
RN-S SA
Operating Instructions, 09/2016, A5E32605810A-03
37
5.2.7 Compensation of height with four or more support points
Check during the installation whether compensation of the height on the brackets is
necessary and meaningful.
Compensation of the height is not meaningful if the load bearing implement and/or the
foundation are elastic. With a rigid load bearing implement and rigid foundation, a bearing
with four or more points is considered as statically undefined. In such cases it is meaningful
to check the load on the individual load cells.
Compensation of the height is necessary in the following cases:
● A load cell is not loaded.
● The danger exists that two diagonally opposite load cells could be overloaded by a full
scale.
Compensate the height as follows:
1.
Determine which load cell has the lowest load.
–
Connect load cells in the junction box.
– Disconnect the load cell cables SIG+ and SIG-.
– Connect a supply voltage, e.g. 10.2 V, to the load cells via a SIWAREX weighing
module.
– Measure the output voltages of the individual load cells between SIG+ and SIG-.
2. Perform the height compensation:
–
Lift the load bearing implement again using the top hexagon nuts on the countersunk
head screws.
– Slightly tighten the hexagon nuts.
– Loosen the fixing screws on the brackets.
– Use spacer plates to underlay the bracket of the load cell with the smallest voltage.
– Slightly tighten the fixing screws on the brackets.
– Lower the load bearing implement uniformly again as described above.
– Tighten the fixing screws on the brackets.
3. Check the output voltages of the load cells again. Repeat the sequence if necessary.