Siemens SIWAREX WL230 BB-S SA Podręcznik - Strona 13
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Overload protection in the transverse direction
For the load cells with a load foot, the weight force is introduced into the load cells via bearing
surfaces. Up to a certain degree, these bearing surfaces allow lateral movement of the load
bearing implement or a change in its length as a result of expansion due to heat. They generate
a restoring force corresponding to the deflection, which re-centers the load bearing implement.
This freedom of movement is desired and necessary for accurate weighing.
If the transverse force is so great that it exceeds the restoring force of the bearing unit and thus
the deflection limit, appropriate protective measures are required. Pendulum limiters or guide
elements are suitable for this, for example.
Set the pendulum limiters in such a way that the maximum deflection is not exceeded in any
direction. The figure below shows the overload protection in the transverse direction using two
examples.
Figure 4-2
4.5
Guide elements
Use the guide elements in the following cases:
● A weight should be determined under the influence of transverse forces.
● Horizontal movement of the load bearing implement should be prevented.
A change in the distance between the support points, for example, as a result of expansion of
the load bearing implement due to heat, must not lead to mutual tensioning of the guide
elements.
The following figure shows the ideal arrangement of guide elements.
SB-S CA
Manual, 06/2019, A5E47600142-AA
Pendulum limitation with a maximum deflection of 4 mm as exemplified by two weighing
platforms
Application planning
4.5 Guide elements
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