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environmental conditions or as a result of some long-term effect associated with the input signal . It can be rectified by means of a null-adjustment current as per DIN 24 311. Expressed in mA or as a % of

). If, on the other hand, variable pumps with power controllers are used, then the installed power can be exploited by increasing the flow rate Q v over a larger range. In (Figure E 14) the cross-hatched

actuated time , but not on the pivoting angle, meaning that large pivoting angles are possible; they can withstand changing loads well; large units are possible; they are primarily used in open circuits.

dynamic friction that, given adequate lubrication, is in the mixed friction area at low velocity and can then change to hydrodynamic friction (Figure D 18) . Friction force measurements are difficult to reproduce

function within the small signal range is of critical importance in most cases. It influences what can be achieved in terms of loop gain and, by implication, the accuracy of feedback control far more than

components by mating surfaces and rods. There are still leakage paths, through which the pressure fluid can flow. The external leaked oil flow Q Le for pumps and motors flows out of the pressurised chambers

converted into some form of description which reflects the kind of signal processing involved. It can operate on a time-dependent basis (time-based control) or a process-dependent basis ( process-dependent

changing outdoor temperatures this setpoint becomes the reference variable. The reference variable can also be considered a setpoint that changes over time or changes a different variable.

the stiffness and accuracy of a drive. Kv is limited by the stability of the control circuit, which can be simplified and calculated as follows ( Figure K 43 ): At a given level of damping D, the maximum

clearer at low rotation speeds. It defines the lower possible rotation speed of a hydraulic motor, which can remain beneath it at certain angles. Fluctuations of the flow rate of hydrostatic displacement machines