WO1996016422A1 - Ensemble de securite a contacteurs - Google Patents

Ensemble de securite a contacteurs Download PDF

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Publication number
WO1996016422A1
WO1996016422A1 PCT/DE1995/001539 DE9501539W WO9616422A1 WO 1996016422 A1 WO1996016422 A1 WO 1996016422A1 DE 9501539 W DE9501539 W DE 9501539W WO 9616422 A1 WO9616422 A1 WO 9616422A1
Authority
WO
WIPO (PCT)
Prior art keywords
contactor
auxiliary
contact
coil
auxiliary contactor
Prior art date
Application number
PCT/DE1995/001539
Other languages
German (de)
English (en)
Inventor
Ralph-Ronald GÖBEL
Original Assignee
Siemens Aktiengesellschaft
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 Siemens Aktiengesellschaft filed Critical Siemens Aktiengesellschaft
Priority to DE59502282T priority Critical patent/DE59502282D1/de
Priority to JP8516432A priority patent/JPH10508977A/ja
Priority to EP95935853A priority patent/EP0792512B1/fr
Publication of WO1996016422A1 publication Critical patent/WO1996016422A1/fr

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

Definitions

  • the invention relates to a contactor safety combination with auxiliary contactors for releasing a drive, in which a first safety or EMERGENCY STOP contact is connected upstream or downstream of at least one of the coils of two auxiliary contactors, the coil of the first auxiliary contactor being an NC contact of the second auxiliary contactor and the coil of the second auxiliary contactor, a first break contact of the first auxiliary contactor is connected in series.
  • an NC contact of a third auxiliary contactor is connected in series with the NC contact of the second auxiliary contactor.
  • a normally open contact of the first auxiliary contactor and a normally open contact of the third auxiliary contactor are in series with the normally closed contact of the first auxiliary contactor.
  • the coil of the third auxiliary contactor is connected in series with a parallel circuit comprising a further normally open contact of the first auxiliary contactor and a further normally open contact of the third auxiliary contactor.
  • the first auxiliary contactor picks up and thus the normally open contact in series with the coil of the second auxiliary contactor closes. Pressing an ON button upstream of this causes the second auxiliary contactor to pull in. Thereupon, by closing a normally open contact of the second auxiliary contactor, the current path of the coil of the third auxiliary contactor is closed and at the same time the current path of the coil of the first auxiliary contactor is interrupted. In this way, the auxiliary contactors are mutually monitored. A drive is only enabled if all three auxiliary contactors are functional. The circuit already has four Switching elements per auxiliary contactor occupied. With three, for example, eight-pole auxiliary contactors, four release circuits can thus be implemented.
  • the switching elements of the auxiliary contactors are used more efficiently, which enables the implementation of at least one enabling circuit with three four-pole auxiliary contactors.
  • a safety or EMERGENCY STOP contact is connected upstream of the coils of three auxiliary contactors connected to the control voltage, and the coil of the first auxiliary contactor is connected in series with NC contacts of the second and third auxiliary contactors.
  • the coils of the second and third auxiliary contactors connected in parallel are preceded by a series connection of normally open contacts of the second and third auxiliary contactors.
  • parallel to this series connection is a normally open contact of the first auxiliary contactor in series with a normally open contact of an ON button.
  • the object of the invention is to create a contactor safety combination of the type mentioned above, which enables the series connection of a protective door and EMERGENCY STOP circuit with as little effort as possible.
  • the object is achieved in that the coil of the first auxiliary contactor has a downstream second contact with the first coupled safety or EMERGENCY STOP contact, that the coil of the second auxiliary contactor has a break contact of an ON button in series is switched that the normally closed contact of the second auxiliary contactor is connected in parallel with a normally open contact of the auxiliary contactor, that the normally closed contact of the first auxiliary contactor is connected in parallel with a normally open contact, that means are provided by which the second auxiliary contactor always picks up before the first when the auxiliary contactors are actuated and that an energy supply is rather in operative connection with the coil of the second auxiliary contactor, which excites the contactor safety combination after voltage connections and a subsequent actuation of the ON button, and converts the second auxiliary contactor into the state of self-holding.
  • the contactor safety combination according to claim 1 has the following advantages:
  • the safety combination also guarantees safety in the event of a short circuit, through which e.g. the series connection of the break contact of the EMERGENCY STOP button and the break contact of the ON button is short-circuited.
  • the ON button is self-monitored, i.e. If the NC contact of the ON button is short-circuited, the circuit is no longer functional.
  • the contactor safety combination enables the implementation of a protective door and EMERGENCY STOP circuit with only two contactors.
  • the circuit is self-monitoring even in the event of volatile errors. It therefore corresponds to the safety standard of previously known circuits of this type. Self-monitoring is advantageously carried out by using a capacitor Energy storage reached, which takes over the memory function of the usually third contactor.
  • FIG. 1 shows a contactor safety combination according to the invention as a two-channel EMERGENCY STOP circuit for DC voltage connection
  • FIG. 2 shows a two-channel protective door circuit according to the invention for DC voltage connection
  • FIG. 3 shows a two-channel EMERGENCY STOP circuit for AC voltage connection.
  • the EMERGENCY STOP circuit essentially consists of two current paths connected in parallel, which are connected via two NC contacts 3, 4 of an EMERGENCY STOP switch.
  • a coil a of a first auxiliary contactor lies in the first current path
  • a coil b of a second auxiliary contactor lies in the second current path.
  • Both coils a and b are preceded by a parallel connection consisting of a normally open and an normally closed contact.
  • the first current path is formed in the order mentioned by the series connection of the parallel connection mentioned, the coil b and the break contact 5, which is connected directly to the negative pole 2.
  • the parallel connection upstream of the coil a consists of a normally open contact K a 2 of the first auxiliary contactor and an normally closed contact K ⁇ of the second auxiliary contactor.
  • the parallel connection upstream of the coil b consists of an NC contact K a ⁇ of the first auxiliary contactor and a NO contact Kj-, 2 of the second auxiliary contactor.
  • the second current path which is formed by the series connection of the second parallel connection mentioned, the coil b, an OFF button 5 and the break contact 4 in the order mentioned, is parallel to the first current path.
  • the parallel current paths are connected to the positive pole 1 via a fuse 11 and a diode 12 in series therewith. Between the connection point of the latter two circuit components and the negative pole 2 there is an ohmic resistor 13 which, together with the diode 12, forms a series circuit which is bridged by a light-emitting diode 10 and a further ohmic resistor 14.
  • a series circuit comprising a light-emitting diode 9 and an ohmic resistor 15 is connected in parallel to the coil a of the first auxiliary contactor.
  • a series connection of the coil b of the second auxiliary contactor and the downstream break contact 5 there is a series connection of a further break contact K a 3 of the first auxiliary contactor, an ohmic resistor 16 and a capacitor 7 in the order mentioned, the cathode of the capacitor 7 being connected to the negative pole 2 is switched.
  • the series connection of the resistor 16 and the break contact K a 3 is bridged by a Zener diode 8, via which the capacitor 7 can be discharged.
  • the first auxiliary contactor can no longer pull in, so that if the second auxiliary contactor pulls in faster, it is ensured that only this pulls in.
  • the capacitor 7 is charged via the still closed open contacts K a ⁇ and K a 3 of the first auxiliary contactor.
  • the break contact 5 opens and the second auxiliary contactor is made to drop out, while the first auxiliary contactor can pick up.
  • the capacitor 7 lying parallel to the coil b of the second auxiliary contactor is already charged by the previous excitation of the latter. Discharge of the capacitor 7 is prevented on the one hand by the fact that the break contact 5 of the ON button interrupts the connection of the second contactor to the negative pole 2 and because, on the other hand, the first pulls in after the second auxiliary contactor drops out, so that the connection to the positive pole 1 is also interrupted is.
  • the EMERGENCY STOP circuit consists of two auxiliary contactors, one of which requires two and the other three switching elements. Accordingly, with only two four-pole auxiliary contactors, an enabling circuit with two NO contacts in series as well as a signaling circuit with one NO contact can be implemented, as indicated in the right part of FIG. 1.
  • the present EMERGENCY STOP circuit has the advantage that even when the normally open contacts of the first auxiliary contactor are welded and the EMERGENCY STOP opener contacts 3, 4 are then unlocked, the second auxiliary contactor no longer picks up since the capacitor 7 is already discharged. Moving the EMERGENCY STOP contacts 3, 4 from the position in front of the contactor coil behind it or vice versa would prevent automatic start-up, but would result in a switch-off delay for the second contactor in the millisecond range. In the event of a fault, ie when the normally open contacts of the first auxiliary contactor are welded, an immediate response of the circuit would no longer be guaranteed.
  • the voltage connection at the connections 1, 2 is monitored and displayed in a simple manner by the light-emitting diode 10.
  • the LED 9 makes the excitation of the first auxiliary contactor visible.
  • FIG. 2 shows the design of a two-channel protective door circuit according to the invention. It differs from the EMERGENCY STOP circuit according to FIG. 1 only in that the break contacts 3, 4 are now switched as a function of the position of a protective door. The two switching elements 3, 4 are also opened in the open state in accordance with the position of the protective door shown.
  • FIG 3 shows a two-channel EMERGENCY STOP circuit for AC voltage connection with a transformer 18 and a rectifier bridge 19 connected in series, through which the AC voltage is transformed down on the one hand and the AC current is rectified. Otherwise, this circuit also fully agrees with that of FIG 1 and thus requires no further explanation.

Landscapes

  • Keying Circuit Devices (AREA)
  • Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
  • Push-Button Switches (AREA)

Abstract

L'invention concerne un ensemble de sécurité à contacteurs, dans lequel deux contacts de sécurité ou d'arrêt d'urgence (Kb1, Ka2 ou Ka1, Kb2) sont montés en aval ou en amont des bobines (a, b) de deux contacteurs auxiliaires . Un condensateur (7) situé parallèlement au deuxième contacteur auxiliaire (b) permet, grâce à sa fonction mémoire, de supprimer le troisième contacteur auxiliaire habituellement nécessaire, de sorte que le circuit fonctionne en s'autosurveillant même en cas de défaillances passagères.
PCT/DE1995/001539 1994-11-18 1995-11-07 Ensemble de securite a contacteurs WO1996016422A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE59502282T DE59502282D1 (de) 1994-11-18 1995-11-07 Schützsicherheitskombination
JP8516432A JPH10508977A (ja) 1994-11-18 1995-11-07 保護安全組み合わせ装置
EP95935853A EP0792512B1 (fr) 1994-11-18 1995-11-07 Ensemble de securite a contacteurs

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DEP4441171.5 1994-11-18
DE4441171A DE4441171C1 (de) 1994-11-18 1994-11-18 Schützsicherheitskombination

Publications (1)

Publication Number Publication Date
WO1996016422A1 true WO1996016422A1 (fr) 1996-05-30

Family

ID=6533624

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE1995/001539 WO1996016422A1 (fr) 1994-11-18 1995-11-07 Ensemble de securite a contacteurs

Country Status (4)

Country Link
EP (1) EP0792512B1 (fr)
JP (1) JPH10508977A (fr)
DE (2) DE4441171C1 (fr)
WO (1) WO1996016422A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19948632B4 (de) * 1999-10-08 2005-08-11 Siemens Ag Aktoreinheit mit einem Grundaktor, einem Zusatzaktor und einer Ansteuereinheit
US6388860B1 (en) * 2000-02-17 2002-05-14 Deere & Company Dual switch control system
EP1174897A3 (fr) 2000-07-19 2004-01-28 Matsushita Electric Works (Europe) Aktiengesellschaft Système magnétique pour un relais électromagnétique
DE10110467C1 (de) * 2001-03-05 2002-08-29 Matsushita Electric Works Europe Ag Magnetsystem für ein elektromagnetisches Relais
DE10037383A1 (de) * 2000-08-01 2002-02-21 Pilz Gmbh & Co Sicherheitsschaltgerät zum sicheren Abschalten eines elektrischen Verbrauchers, insbesondere einer elektrisch angetriebenen Maschine
FR3095548B1 (fr) 2019-04-24 2021-05-07 Clearsy Interrupteur sécurisé

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3541338A1 (de) * 1985-11-22 1987-05-27 Pepperl & Fuchs Schaltung mit selbstueberwachung
DE3937122A1 (de) * 1989-11-10 1991-05-16 Elan Schaltelemente Gmbh Schaltungsanordnung mit sicherheitsfunktion
DE4337665C1 (de) * 1993-11-04 1994-10-20 Siemens Ag Schützsicherheitskombination
DE4413676C1 (de) * 1994-04-20 1995-09-21 Siemens Ag Schützsicherheitskombination

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3933699C2 (de) * 1989-10-09 1998-12-03 Siemens Ag Schützsicherheitskombination

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3541338A1 (de) * 1985-11-22 1987-05-27 Pepperl & Fuchs Schaltung mit selbstueberwachung
DE3937122A1 (de) * 1989-11-10 1991-05-16 Elan Schaltelemente Gmbh Schaltungsanordnung mit sicherheitsfunktion
DE4337665C1 (de) * 1993-11-04 1994-10-20 Siemens Ag Schützsicherheitskombination
DE4413676C1 (de) * 1994-04-20 1995-09-21 Siemens Ag Schützsicherheitskombination

Also Published As

Publication number Publication date
JPH10508977A (ja) 1998-09-02
DE4441171C1 (de) 1996-02-08
EP0792512A1 (fr) 1997-09-03
DE59502282D1 (de) 1998-06-25
EP0792512B1 (fr) 1998-05-20

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