Positive displacement principle
connection). As there is no direct link between the two connections, pumps that operate in accordance with the positive displacement principle ( Displacement machine (displacement unit) ) are well suited to
Printed circuit board
components required or the integrated circuits (IC) are mounted and their wire connections are connected with the conductor tracks by means of dip soldering.
Position/time diagram
diagram . Of a cylinder : Qualitative illustration of the movement process of a cylinder , starting with the acceleration phase and the different working movements over the holding phase to the reflux (
Annular area
area of the piston rod Ar St: When performing an accurate force measurement of a hydraulic cylinder with a dual effect and a piston rod on one side ( differential cylinder ) the pressure which may be acting
Variable pump, variable motor
case ( pump control , primary control ). Variable motors are needed for hydrostatic transmissions with secondary adjustment or primary-secondary adjustment as well as for secondary control .
Action of multiple resistance
As with electrics, a distinction is made in fluid technology between series and parallel resistances. For series circuits - as is the case for pipelines - the individual resistances are added ( series
Intake characteristic
occurs, either the hydraulic fluid must be fed to the pump (pump under the tank) or it must be supplied with pressure (charge pump)
Velocity measurement
consequence there are mostly very large disturbance elements in the velocity signal. Differentiation with digital measuring systems On incrementally operating measuring systems the number of the pulses added [...] method of determining the velocity is largely immune to interference and is often used these days in with digital signal processing . DC generator To measure angular velocities, essentially DC generators [...] speed over a wide tacho rotation speed range. A disadvantage for these generators is the collector with brushes necessary for commutation; collectors require regular maintenance. The voltage tapped on the
Errors in a control
definition of a dangerous error in a control can only be derived from the interaction of the control with the device to be controlled. Here both active errors (e.g. unintended placing in operation) and also [...] long as both circuits work, the failure is not noticed, however if one circuit fails the other fails with it.
Programmable logic controller (PLC)
be equipped with control units which work by bits or by words (EDIN 19 226 T 5). In contrast to the hard-wire programmed control, the PLC has application-independent standard hardware with application