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Relay control

The handset activates electromechanical relays which, in turn, switch the drive currents. There are almost no restrictions as regards the selection of handsets and operating equipment.

Relay-free control

(control without relay) 
With this control concept, the drive currents are switched directly via the handset. Here, so-called X or Y cables are often used. With certain drive types, this functionality can also be integrated directly into the drive casing.

Retracting function

Mechanical retracting function: 
Mechanical disconnection – because of the mechanical design, this function should only be activated in an emergency. Regular use might have a negative effect on the drive function. 
The drive gear can be disconnected from the drive mechanism via a mechanical clutch element. This allows the corresponding furniture parts to be adjusted manually. Operation of the disconnection process is via a lever which is integrated in the drive casing; the lever can be activated remotely via cable controls or Bowden cables. 
The clutch of the lowering function must be open during the entire downward movement. 
Electrical retracting function: 
This permits the emergency operation of a drive system in the event of a power failure. Depending on the type, the drive is supplied with power from either one or two 9-volt batteries. 
As a result of the extremely reduced capacity of the sources of power, the drive movement is restricted to a single emergency operation. In particular, please note that in many cases it is not possible to carry out a drive movement under load.

Rotation actuator

The drive carries out a rotary movement. The double drive has a function between that of the rotation actuator and that of the linear actuator. Here, an internal straight movement is first converted into a rotary movement via an external fitting system. This is why the double drive is normally considered to be a linear actuator.