Errors in a control
Errors that cause a hazard for man and/or machine. The 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 [...] unintended placing in operation) and also passive errors (e.g. prevention of intended standstill) can be dangerous errors (DIN 19 237). Sleeping errors : Errors that only occur if another error has occurred
Programmable logic controller (PLC)
program changes by changing or replacing the stored program, short commissioning times as changes can be made quickly, automatic and error-free program documentation, identifying and localising errors [...] and logic control system , therefore as a replacement for relay and contactor controls. However, it can normally be enhanced for control technology tasks.
Two edge control
actuator with two displacement chambers by two hydraulic half bridges , in which only one resistance can be controlled (combination of type B + C half bridges). A common application is the control of an actuator [...] (outlet) or in the case of opposite directions of movement P B (inlet ) and A T (outlet) are active. This can be interpreted on one type C half bridge in the inlet and a type B half bridge in the outlet. In the
Particle size
(core sand, welding particles, chips) and not properly removed prior to assembly. Particle sizes can vary greatly and their distribution – in terms of quantity – is not very even either ( Figure P 4 ) [...] ), into contamination classes or cleanliness grades . It is important to remember that the filter can only ever retain a fraction of the wide range of solid particles present. Most damage is caused by
Control
the influence of disturbance variables on the actual state ( Figure S 89 ). In contrast to , control can be used as a collective term in regard to the functional workflow of a complex process. Logically, [...] controlled arrangement ( process-dependent workflow control). In practical applications, the term control can have multiple meanings: It is not only used for the process of controlling, but also for all of the
Diagnostic systems
programs can be very high (up to 100 % of the control program). It is nevertheless worthwhile if the value of increased availability and reliability is valued highly enough. This effort can however be
Pressure peak
Pressure pulse that can go beyond the calculated pressure (DIN 24 312).
Correcting range
Range within which the correcting variable can be adjusted (DIN 19 226).
Load sensing system
pressure and flow rate to reflect the requirements of one or more consumers at any given time. LS systems can be created using a constant pump as well as a variable pump . The highest pressure occurring in the [...] orifices; if the pressure compensator is located upstream, the consumer subjected to the highest load can remain, providing the total for the flow rates required is greater than the max. delivery flow for
Value discrete
The signal parameter can only assume defined discrete values (or overlapping value ranges) (DIN 19 225).