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Position feedback

This is a technical device for recording the current drive position and speed. 
In all cases, a distinction is made between incremental and absolute processes. 
Hall sensor (incremental): 
For each distance travelled, the position feedback system generates a specified number of electrical impulses. The control unit uses this information to calculate the current information regarding position and speed relative to a specified reference point. In order to guarantee that the drive functions reliably, the correct reference value must be available at all times. If the data on the reference point are lost in the unlikely event of a mains power failure or a malfunction, re-referencing will have to be carried out. 
Potentiometer (absolute): 
A potentiometer is an electronic component which alters its resistance value according to its current position. Consequently, a potentiometer which is firmly coupled to the drive mechanism generates a changing resistance value which corresponds directly to the current drive position. The control unit uses this information to calculate the current position and speed. This method of recording a path does not require any referencing, and the complete information on positions is available at all times and without any restrictions. In the case of drives with mechanical disconnection, only an absolute position feedback system can be used.


Power supply

In numerous applications, drive and control systems with a direct mains connection were replaced by external power supplies. Supply to the application is with a protective low voltage; there is no direct connection to the mains power supply. Depending on the technical concept of the drive system, the power supply is with DC or AC.


Protection category

The tightness of an item of electrical equipment against penetration by solid and liquid materials is classified using the two-digit IP code in accordance with EN 60 529. The first digit defines protection against penetration by solid materials such as dust; the second digit defines protection against liquids. Standard protection categories include IP 20 (protection against accidental contact), IP 44 (splash or weatherproof protection) and IP 66 (hoseproofness).


Protection class

As only insulating plastic casings are used, DEWERT main drives and control units are made exclusively in protection class II. The two-core mains cable does not have protective earthing. 
As an additional option, these components can also be supplied in protection class I, in which the additional earth wire (PE) is fitted to a casing screw which is accessible from the outside. This means that metal furniture parts can easily be fitted to earth potential – from a technical point of view, there is no difference between these drives and a comparable drive system using protection class II.


Protection type

The tightness of an item of electrical equipment against penetration by solid and liquid materials is classified using the two-digit IP code in accordance with EN 60 529. 
The first digit defines protection against penetration by solid materials such as dust; 
the second digit defines protection against liquids. Standard protection types include IP 20 (protection against accidental contact), IP 44 (splash or weatherproof protection) and IP 66 (hoseproofness). 
However, a high protection type does not indicate anything about the degree of protection in a wash tunnel.


Push forces

The maximum load which a double drive can support does not only depend on the constructional aspects which are described via the load capacity. 
In particular, the actual usable load depends on the electrical – and therefore on the mechanical – output of the drive which is available. The “push forces” value indicates which maximum load distributed over both drive sides can be handled by the double drive. Primarily it depends on the efficiency of the electronic components which are used (e.g. transformers).