Hierarchical control circuit
Function unit for a contiguous sub-process that is superordinate to the related individual controls or drive controls, but that is subordinate to the master control (DIN 19 237) (Figure G 26) .
Energy saving in hydraulics
Possibilities for energy saving result from measures to reduce the energy demand and energy loss as well as to recover energy . Specifically these are the following measures (Table E 2) : Design impro
Dual variable pump
Multi-circuit pump normally with an inclined axis design, but also a design according to the swash plate principle, in which two drives are included in one housing. In the case of an inclined axis des
Unistable
Behaviour of a binary element or switching circuit, for which the time period, during which the element remains outside its stable state, is only determined by the duration of the corresponding signal
Kv factor (speed/stroke gain)
Relationship between the respective (actual) velocity V and the following velocity error Δs (= control deviation ) during positioning. Kv is a measure therefore of velocity amplification in the statio
Transmission technology
Electrical signals are transmitted as analogue or digital signals. In the case of analogue transfer technology, electrical oscillations are used, which are modulated according to the original signal.
Pilot control
Control on which between the reference variable and output variable in the steady state there is always a unique relationship, provided disturbance variables do not cause any deviation (DIN 19 226).