Accumulator consumption diagram
practical to create an accumulator consumption diagram ( Figure S 69 ). The pump must be selected with a certain size in order to replace the removed usable volume before the end of the working cycle:
Processing of actual values (or signals)
values (or signals) for a proportional valve covers an input voltage range of 0 to 10 V and a network with null bias and amplification for modifying the sensors.
Time constant
and the valve behaviour in the subsystem does not play a role) or in the case of comparable elements with an increase according to an exponential function. The time constant results as the inverse of the
Natural frequency fo
f = f o), the phase angle = —90o and the amplitude will be 1/2 the initial amplitude where f = 0. With a high response proportional valve, the natural frequency for the valve should be much higher (around
Viscosity classes
order to the highly different viscosities of conventional mineral oils they are grouped into classes with a defined bandwidth (according to DIN 51 519 = ±10 %). Equally, the viscosities named in this are
Tank
degree (Table B 1) . As the tank is manufactured of thin material, it must not be in physical contact with the pump to prevent noise propagation. Tanks mostly have a breather filter that connects them to the
Pressure
Pressure figures, if not otherwise stated, in fluid technology are to be understood as overpressure, i.e. with atmospheric pressure as the reference variable. The pressure of a medium is one of the most important
Variable area principle
only be installed perpendicular and are primarily used in pneumatic systems. Loading a floating body with a spring force means that the measuring device is position-independent and can be designed such that
Process-dependent workflow control
Workflow control with step enabling conditions that are only dependent on signals from the controlled system (process) (DIN 19 237). The process-dependent workflow control – previously known as "sequence
Overrun
action. The overrun poses great difficulties when approaching a position at any speed. If this happens with switching valves , a crawl speed must first be used. In the case of proportional valves the delay