Siemens SIWAREX WL270 CP-S SA Manuale di istruzioni per l'uso - Pagina 18
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Application planning
4.4 Overload protection
Overload protection in the transverse direction
For the CP-S SB load cells, the weight force is introduced into the load cells via spherical
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 load cell (and thus
the deflection limit), then corresponding protective measures are required. Pendulum limiters
or guide elements are suitable for this, for example.
Pendulum limiters must be constructed or set in such a way that the maximum deflection
cannot be exceeded in any direction. This is shown in two examples in the following figure.
Figure 4-2
18
Pendulum limitation with a maximum deflection of 4 mm as exemplified by two weighing
platforms
Operating Instructions, 11/2010, A5E03323543B
CP-S SB