Electricity: electrical systems and devices – Control circuits for electromagnetic devices – For relays or solenoids
Patent
1993-04-12
1995-07-25
Young, Brian K.
Electricity: electrical systems and devices
Control circuits for electromagnetic devices
For relays or solenoids
361190, 361189, H01H 4722
Patent
active
054367891
ABSTRACT:
Surveillance of signal changes, especially for self-checking control systems. It is essential in self-checking control systems to create equipment to monitor signal changes and allowing to detect all conceivable initial errors or defects and to allow beginning a dangerous state or a dangerous motion of a machine only when the input peripherals evince, not only for instance static signals, but after definitively at least one change of signal has taken place and after this input signal was successfully checked dynamically for its suitability in beginning the dangerous state or the dangerous motion of a machine. For that purpose a special circuitry is proposed in which at least one signal source as well as relays and relay contacts are arrayed in such manner that both self-checking signal detection and voltage-free transfer of at least one checked signal to a higher safety level shall take place.
REFERENCES:
patent: 3089985 (1963-05-01), Camfield et al.
patent: 4392176 (1983-07-01), Kneip et al.
patent: 4775913 (1988-10-01), Ekblad
Fleming Fritz M.
Square D Company (Deutschland) GmbH
Young Brian K.
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