Control algorithm
algorithm is described by the mathematical relationship between the input and output variables or can be derived from this (DIN 19 226).
Signal selector
set such that the task variable reaches its setpoint, the signal selector for the reference variable can also be called setpoint signal selector (DIN 19 226).
Supply of a control unit
functional units to supply the technical control and feedback control devices with energy. The term supply can be more clearly specified by adding supplementary terms as a prefix according to the type of energy
Delay valve
air container. After the container is filled, a valve is reversed ( Figure V 24 ). The fill speed can be configured using a throttle.
Sampling feedback control
discrete time operation. If the sampling frequency is high enough (quasi continuous), the process can be used for continuous control circuits.
Non-contact seals
surfaces involved in the sealing process do not touch. Due to the remaining gap, non-contact seals can never seal completely. The most important representatives of non-contact seals are the gap seals, the
Open loop control system
87 a ). A control chain as a whole can always be connected to further systems in any functional relationship within a parent system (DIN 19 226) ( b ). A control can be considered as a chain (or series
Dirt absorbing capacity of a filter
real dirt holding capacity. This provides information on the quantity of dirt that a certain filter can hold before a reference pressure (normally the response pressure of the bypass valve ) is reached. [...] also a measure of the service life of that filter element . The dirt absorbing capacity of a filter can be calculated to a high degree of accuracy using the α-value. Its size depends primarily on the filter
Tachogenerator
Device used to measure angular rotation speed. Tachogenerators can work as DC or AC generators. DC generator : The most commonly used process, in which a rotor turns in a magnetic field. The direct current [...] generated in this way is proportional to the rotation speed over a wide range ( Figure T 1 ). Advantage: Can be used at low rotation speeds. Disadvantage: The collector with brushes requires regular maintenance
Integrated position measuring systems
this on the outside ( hydraulic axis ). Integration does mean, however, that the measuring system can operate in oil and is resistant to pressure if the idea is to avoid very intricate designs. The following [...] principle. Whereas the first three use measurement lengths of 500 or 1000 mm, ultrasonic sensors can be manufactured for lengths of several metres. They may also feature a digital output.