Siemens SIWAREX WL270 CP-S SA 사용 설명서 - 페이지 15

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4.4

Overload protection

CAUTION

Irreparable faults and damage to the load cells

When using load cells with small rated loads, always provide overload protection in order to

protect the cells from becoming damaged. This applies both to the measuring direction and

the transverse direction.

If load cells are used beyond the maximum working load or the maximum transverse load,

this can cause irreparable faults and even fracturing of the load cell or the installation unit.

Overload protection in the measuring direction

Load cells can be protected against vertical overload by limiting the measuring path with

stops.

For load cells with high rated loads, the risk of an unintentional overload is not as great.

Possible additional loads can already be taken into consideration during the dimensioning of

the load cells.

Another method for protecting load cells from an overload is to over-dimension the load cells.

Overload protection in the transverse direction

For the CP-S SA load cells, 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 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

CP-S SA

Operating Instructions, 04/2009, A5E02522341B

Pendulum limitation with a maximum deflection of 4 mm as exemplified by two weighing

platforms

Application planning

4.4 Overload protection