SE7806345L - DEVICE FOR ELECTRICAL MONITORING OF PRESSURE SAFETY VALVES - Google Patents

DEVICE FOR ELECTRICAL MONITORING OF PRESSURE SAFETY VALVES

Info

Publication number
SE7806345L
SE7806345L SE7806345A SE7806345A SE7806345L SE 7806345 L SE7806345 L SE 7806345L SE 7806345 A SE7806345 A SE 7806345A SE 7806345 A SE7806345 A SE 7806345A SE 7806345 L SE7806345 L SE 7806345L
Authority
SE
Sweden
Prior art keywords
relays
limit switches
safety valves
lines
switched
Prior art date
Application number
SE7806345A
Other languages
Unknown language ( )
Swedish (sv)
Other versions
SE417361B (en
Inventor
K-U Erbse
Original Assignee
Spindler Deissler Starkstrom
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Spindler Deissler Starkstrom filed Critical Spindler Deissler Starkstrom
Publication of SE7806345L publication Critical patent/SE7806345L/en
Publication of SE417361B publication Critical patent/SE417361B/en

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H47/00—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current
    • H01H47/002—Monitoring or fail-safe circuits
    • H01H47/004—Monitoring or fail-safe circuits using plural redundant serial connected relay operated contacts in controlled circuit
    • H01H47/005—Safety control circuits therefor, e.g. chain of relays mutually monitoring each other

Landscapes

  • Safety Devices In Control Systems (AREA)
  • Control Of Presses (AREA)

Abstract

The press safety valves are equipped with limit switches (16, 17) which are open in the normal position and are simultaneously triggered by the valve tappets. The limit switches (16, 17) are situated in a self-monitoring control circuit with relays (11-15, 30) which are arranged in parallel lines (6-10, 37) between two supply lines (4, 5). When the current is switched on at the supply lines (4, 5), two of the relays (13, 14) are switched on and keep themselves locked. A further relay (30) only releases the output (22, 23) when current reaches it and both limit switches (16, 17) are closed, in this sequence. If another sequence is followed, owing to tampering or switching errors, or if there are malfunctions within the control system, e.g. due to defective lines, relays, relay points or short circuits, the output (22, 23) is blocked. <IMAGE>
SE7806345A 1978-04-26 1978-05-31 ELECTRICAL MONITORING OF PRESSURE SAFETY VALVES SE417361B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19782818173 DE2818173B1 (en) 1978-04-26 1978-04-26 Arrangement for electrical monitoring of press safety valves

Publications (2)

Publication Number Publication Date
SE7806345L true SE7806345L (en) 1979-10-27
SE417361B SE417361B (en) 1981-03-09

Family

ID=6037990

Family Applications (1)

Application Number Title Priority Date Filing Date
SE7806345A SE417361B (en) 1978-04-26 1978-05-31 ELECTRICAL MONITORING OF PRESSURE SAFETY VALVES

Country Status (4)

Country Link
CH (1) CH644303A5 (en)
DE (1) DE2818173B1 (en)
FR (1) FR2424580A1 (en)
SE (1) SE417361B (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3619723A1 (en) * 1986-06-12 1987-12-17 Kloeckner Moeller Elektrizit Additional controller, having contacts, for safety circuits
DK0565745T3 (en) * 1992-04-13 1996-11-11 Schneider Electric Gmbh Monitoring of a signal change, especially in self-controlling operating systems

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2447123A1 (en) * 1974-10-02 1976-04-08 Herion Werke Kg Press valve checking circuit - has spindles of independent operating valves probed by proximity arrangement

Also Published As

Publication number Publication date
FR2424580A1 (en) 1979-11-23
FR2424580B1 (en) 1984-07-06
CH644303A5 (en) 1984-07-31
DE2818173B1 (en) 1979-03-29
SE417361B (en) 1981-03-09

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