Lifting Protection; Overload Protection; Grounding Cable - Siemens SIWAREX WL230 Equipment Manual

Description
3.1 Area of application
Guide elements are used in the following cases:
• Horizontal forces occur during the weighing procedure. This is the case with all dynamic
weighing procedures or if containers are weighed outdoors where wind can have an effect.
• Movement of the load bearing implement as a result of horizontal forces is prevented. This
is the case with braking or acceleration forces of belt or roller table scales or with mixing
tanks in which unbalance can occur as a result of an agitator.
The SIWAREX guide elements are used together with the compact mounting units. The guide
elements have the following characteristics:
• Subsequent attachment to the compact installation unit
• You can install a guide element either on the front or rear of the compact mounting unit.
• The double-sided attachment of two guide elements doubles the possible transverse force.
• Parts made of stainless steel for applications in the food and pharmaceutical industries
Do not tension weighing equipment using guide elements. The guide elements must not
prevent changes in the dimensions of the load bearing implement resulting from changes in
temperature, for example. This can principally be achieved by always using three guide
elements.
3.1.3

Lifting protection

The lifting protection prevents the load bearing implement from being lifted off of the load cells.
If there is a risk of the load bearing implement being lifted or toppled, then lifting protection is
required. Lifting protection is required in the case of lightweight containers and tall, outdoor
silos.
3.1.4

Overload protection

The overload protection protects load cells from a load that is too great.
There is overload protection against excessive loads in the measuring direction and overload
protection against excessive transverse forces.
Transverse forces are caused by, for example, wind, filling processes, acceleration, or conveyor
belt friction. Protect the load cell from loads as stated in section Technical data (Page 39).
3.1.5

Grounding cable

The grounding cable is used to protect the load cells from undesired currents. The causes of such
currents are, for example:
• Equalizing currents with missing or faulty equipotential bonding conductors
• A lightning strike nearby
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Equipment Manual, 12/2020, A5E02390707B-03
SB-S SA