EP0721200B1 - Safety combination - Google Patents

Safety combination Download PDF

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Publication number
EP0721200B1
EP0721200B1 EP95120011A EP95120011A EP0721200B1 EP 0721200 B1 EP0721200 B1 EP 0721200B1 EP 95120011 A EP95120011 A EP 95120011A EP 95120011 A EP95120011 A EP 95120011A EP 0721200 B1 EP0721200 B1 EP 0721200B1
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EP
European Patent Office
Prior art keywords
contact
auxiliary contactor
auxiliary
coil
contactor
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EP95120011A
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German (de)
French (fr)
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EP0721200A1 (en
Inventor
Josef Dipl.-Ing. Zizler (Fh)
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Siemens AG
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Siemens AG
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    • 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 safety combination with auxiliary contactors to release a drive in which a first safety or EMERGENCY STOP contact at least one of the Coils of two auxiliary contactors is connected upstream or downstream, whereby the coil of the first auxiliary contactor an NC contact second auxiliary contactor and the coil of the second auxiliary contactor a first break contact of the first contactor in series is switched.
  • the invention has for its object a safety combination of the above type to create the series connection a protective door and EMERGENCY STOP circuit with as much as possible allows little effort, the start function in accordance with the DIN regulations (DIN EN 60204) by means of a normally open contact of an ON button should.
  • the coil of the first auxiliary contactor a downstream second with the has the first coupled safety or EMERGENCY STOP contact, that the coil of the second auxiliary contactor is a break contact an ON button is connected in series that the Normally closed contact of the second auxiliary contactor of the auxiliary contactor is parallel that the break contact of the first auxiliary contactor is a normally open contact that Means are provided by which when the auxiliary contactors are actuated always pulls the second auxiliary contactor in front of the first and that an ON button for the coil of the second auxiliary contactor with a normally open contact.
  • the circuit corresponds to the security standard known to date Circuits of this type.
  • the self-monitoring will advantageously by using a capacitor as Energy storage reached, the memory function of the usually takes over third contactor.
  • the drawing shows a two-channel EMERGENCY STOP circuit with a rectifier 25 connected to an 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 .
  • In the first current path there is a coil a of a first auxiliary contactor, in the second current path there is a coil b of a second auxiliary contactor. Both coils a and b are each connected in parallel from a make contact and a break contact.
  • the first current path is formed in the order mentioned by the series connection of the parallel connection mentioned, the coil b and an ohmic resistor 24 which is connected directly to the negative pole 2 of the rectifying device 25.
  • connection point between the resistor 24 and the coil b bears the reference numeral 26.
  • the parallel connection upstream of the coil a consists of a normally open contact K a2 of the first auxiliary contactor and an normally closed contact K b1 of the second auxiliary contactor.
  • the parallel connection upstream of the coil b consists of an NC contact K a1 of the first auxiliary contactor and a NO contact K b2 of the second auxiliary contactor, this parallel connection being formed with the help of an NC contact 5 of an ON button.
  • This break contact 5 is advantageously not on the side that is to be connected to the protective line system.
  • the coil b and the ohmic Resistor 24 is formed in the order mentioned parallel to the first current path.
  • the parallel current paths are via a fuse 11 and a diode 12 in series with the positive pole 1 of the Rectifier 25 connected.
  • an ohmic resistor 13 which forms a series circuit together with the diode 12, by a light emitting diode 10 and another ohmic Resistor 14 is bridged.
  • 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 and the normally closed contact 4 connected to it.
  • a series circuit comprising a further break contact K a3 of the first auxiliary contactor, an ohmic resistor 16 and a capacitor 7 is connected in parallel in the order mentioned via the break contact 5 of the ON button.
  • the series connection of the resistor 16 and the break contact K a3 is bridged by a Zener diode 8, via which the capacitor 7 can be discharged.
  • Parallel to the coil b of the second auxiliary contactor is a normally open contact 21, which also belongs to the ON button.
  • 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 EMERGENCY STOP circuit consists of two auxiliary contactors, one of which requires two and the other three switching elements. As a result, an enabling circuit with two NO contacts in series and a signaling circuit with one NO contact can be implemented with just two four-pole auxiliary contactors.
  • the present EMERGENCY STOP circuit has the advantage that even when the NO contacts of the first are welded Auxiliary contactor and then unlocking the emergency stop opener contacts 3,4 the second auxiliary contactor no longer picks up because the capacitor 7 is already discharged. Moving the EMERGENCY STOP contacts 3,4 from the position in front of the contactor coil behind the same or vice versa, was an automatic Prevent starting, but as a disadvantage a switch-off delay for the second auxiliary contactor in the millisecond range have as a consequence. This would result in the event of an error, i.e. Welding NO contacts of the first auxiliary contactor an immediate response of the circuit is no longer guaranteed.
  • the voltage connection at terminals 1,2 is simple Monitored and displayed by the LED 10.
  • the LED 9 excites the first auxiliary contactor visible.
  • the ON button is switched so that an earth fault is present the cables fed to it and in the ON button to open it of the release group.
  • the error type "cross circuit" between the lines to the ON button will be activated at the next start command recognized with the ON button by no release can be done.
  • the number of release circles is three compared to the number on NO contacts, which a switching device after each state of the art.

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Description

Die Erfindung bezieht sich auf eine Sicherheitskombination mit Hilfsschützen zur Freigabe eines Antriebs, bei dem ein erster Sicherheits- oder NOT-AUS-Kontakt mindestens einer der Spulen zweier Hilfsschütze vor- bzw. nachgeschaltet ist, wobei der Spule des ersten Hilfsschützes ein Öffnerkontakt des zweiten Hilfsschützes und der Spule des zweiten Hilfsschützes ein erster Öffnerkontakt des ersten Hilfsschützes in Reihe geschaltet ist.The invention relates to a safety combination with auxiliary contactors to release a drive in which a first safety or EMERGENCY STOP contact at least one of the Coils of two auxiliary contactors is connected upstream or downstream, whereby the coil of the first auxiliary contactor an NC contact second auxiliary contactor and the coil of the second auxiliary contactor a first break contact of the first contactor in series is switched.

Sicherheitskombinationen der obengenannten Art sind aus DE-OS 39 33 699 bekannt. Hier ist zum Öffnerkontakt des zweiten Hilfsschützes ein Öffnerkontakt eines dritten Hilfsschützes in Reihe geschaltet. Zum Öffnerkontakt des ersten Hilfsschützes liegt ein Schließerkontakt des ersten Hilfsschützes und ein Schließerkontakt des dritten Hilfsschützes in Reihe. Die Spule des dritten Hilfsschützes ist mit einer Parallelschaltung aus einem weiteren Schließerkontakt des ersten Hilfsschützes und einem weiteren Schließerkontakt des dritten Hilfsschützes in Reihe geschaltet.Safety combinations of the type mentioned above are off DE-OS 39 33 699 known. Here is the break contact of the second Auxiliary contactor an NC contact of a third auxiliary contactor connected in series. To the NC contact of the first contactor there is a normally open contact of the first auxiliary contactor and a normally open contact of the third auxiliary contactor in series. The coil of the third auxiliary contactor is connected in parallel from another NO contact of the first Auxiliary contactor and another NO contact of the third Auxiliary contactors connected in series.

Bei Anlegung einer Spannung an diese Sicherheitskombination zieht das erste Hilfsschütz an und damit schließt auch der in Reihe zur Spule des zweiten Hilfsschützes liegende Schließerkontakt. Die Betätigung eines diesem vorgeschalteten EIN-Tasters bewirkt das Anziehen des zweiten Hilfsschützes. Daraufhin wird durch Schließen eines Schließerkontakts des zweiten Hilfsschützes die Strombahn auch der Spule des dritten Hilfsschützes geschlossen und zugleich die Strombahn der Spule des ersten Hilfsschützes unterbrochen. Auf diese Weise erfolgt eine gegenseitige Überwachung der Hilfsschütze. Nur bei Funktionsfähigkeit aller drei Hilfsschütze wird ein Antrieb freigegeben. Durch die Schaltung sind bereits vier Schaltglieder pro Hilfsschütz belegt. Mit drei beispielsweise achtpoligen Hilfsschützen lassen sich somit vier Freigabekreise realisieren.When a voltage is applied to this safety combination pulls in the first auxiliary contactor and thus the in closes Normally open contact to the coil of the second auxiliary contactor. The actuation of an ON button connected upstream of this causes the second auxiliary contactor to pull in. Thereupon is made by closing a normally open contact of the second Auxiliary contactor also the current path of the coil of the third auxiliary contactor closed and at the same time the current path of the coil of the first auxiliary contactor interrupted. This is done mutual monitoring of the auxiliary contactors. Only with functionality one drive is enabled for all three auxiliary contactors. The circuit already has four switching elements occupied per contactor. With three, for example, eight-pin Auxiliary contactors can thus implement four release circuits.

Bei einer demgegenüber verbesserten Sicherheitskombination gemäß der nicht vorveröffentlichten deutschen Patentanmeldung P 43 37 665.7 werden die Schaltglieder der Hilfsschütze effizienter ausgenützt, was die Realisierung zumindest eines Freigabekreises mit drei vierpoligen Hilfsschützen ermöglicht. Auch hier ist den einseitig an Steuerspannung liegenden Spulen dreier Hilfsschütze ein Sicherheits- oder NOT-AUS-Kontakt vorgeschaltet, und der Spule des ersten Hilfsschützes ist die Reihenschaltung von Öffnerkontakten des zweiten und dritten Hilfsschützes vorgeschaltet. Im Unterschied zu bekannten Sicherheitskombination gemäß DE-OS 39 33 699 ist hier den parallel geschalteten Spulen des zweiten und dritten Hilfsschützes eine Reihenschaltung aus Schließerkontakten des zweiten und dritten Hilfsschützes vorgeschaltet. Weiterhin liegt parallel zu dieser Reihenschaltung ein Schließerkontakt des ersten Hilfsschützes in Reihe mit einem Schließerkontaktes eines EIN-Tasters.With an improved safety combination according to the unpublished German patent application P 43 37 665.7 the switching elements of the auxiliary contactors become more efficient exploited what the realization of at least one Enabling circuit with three four-pole contactors. Here too is the one-sided control voltage Coils of three contactors one safety or EMERGENCY STOP contact upstream, and the coil of the first auxiliary contactor is the series connection of NC contacts of the second and upstream of the third auxiliary contactor. In contrast to known ones Safety combination according to DE-OS 39 33 699 is here the parallel coils of the second and third Auxiliary contactors are connected in series from NO contacts upstream of the second and third auxiliary contactors. Farther there is a normally open contact parallel to this series connection of the first auxiliary contactor in series with a normally open contact of an ON button.

Der Erfindung liegt die Aufgabe zugrunde, eine Sicherheitskombination der obengenannten Art zu schaffen, die die Reihenschaltung einer Schutztür- und NOT-AUS-Schaltung mit möglichst geringem Aufwand ermöglicht, wobei die Startfunktion in Übereinstimmung mit den DIN-Vorschriften (DIN EN 60204) mittels eines Schließerkontaktes eines EIN-Tasters erfolgen soll. Die Aufgabe wird dadurch gelöst, daß die Spule des ersten Hilfsschützes einen nachgeschalteten zweiten mit dem ersten gekoppelten Sicherheits- oder NOT-AUS-Kontakt aufweist, daß der Spule des zweiten Hilfsschützes ein Öffnerkontakt eines EIN-Tasters in Reihe geschaltet ist, daß dem Öffnerkontakt des zweiten Hilfsschützes ein Schließerkontakt des Hilfsschützes parallel liegt, daß dem Öffnerkontakt des ersten Hilfsschützes ein Schließerkontakt parallel liegt, daß Mittel vorgesehen sind, durch die bei Betätigung der Hilfsschütze stets das zweite Hilfsschütz vor dem ersten anzieht und daß zur Spule des zweiten Hilfsschützes ein EIN-Taster mit einem Schließerkontakt liegt.The invention has for its object a safety combination of the above type to create the series connection a protective door and EMERGENCY STOP circuit with as much as possible allows little effort, the start function in accordance with the DIN regulations (DIN EN 60204) by means of a normally open contact of an ON button should. The object is achieved in that the coil of the first auxiliary contactor a downstream second with the has the first coupled safety or EMERGENCY STOP contact, that the coil of the second auxiliary contactor is a break contact an ON button is connected in series that the Normally closed contact of the second auxiliary contactor of the auxiliary contactor is parallel that the break contact of the first auxiliary contactor is a normally open contact that Means are provided by which when the auxiliary contactors are actuated always pulls the second auxiliary contactor in front of the first and that an ON button for the coil of the second auxiliary contactor with a normally open contact.

Die beanspruchte Sicherheitskombination weist folgende Vorteile auf:

  • 1. Die Anzahl der Freigabekreise ist so hoch wie ein Schaltgerät nach jeweils neuestem technischen Standard maximal eine Anzahl von Schließern haben kann, abzüglich drei und abzüglich eventuell erforderlicher Meldekreise (z.B. Relais mit 10 Schließern ergibt 7 Freigabekreise).
  • 2. Die Anzahl der Meldekreise kann maximal der Anzahl der Freigabekreise entsprechen, abzüglich eins, mit welchem ein Freigabekreis realisiert werden soll.
  • 3. Der EIN-Taster ist nicht dauernd selbstüberwacht, d.h. eine Unterbrechung der Leitung zum EIN-Taster führt nicht zum Abschalten der angeschlossenen Maschine(n).
  • 4. Bei Leitungsunterbrechungen mit anschließendem Berühren der unterbrochenen Leitungen führen nicht zur Freigabe und damit zum Start der Maschine(n). Leitungsunterbrechungen zum EIN-Taster werden also rechtzeitig erkannt.
  • 5. Der EIN-Taster beinhaltet nicht ausschließlich einen Öffner-Kontakt, was nach DIN EN 60204 Kap. 9.2.1 nicht zulässig ist ("Startfunktionen müssen durch Erregen des jeweiligen Kreises erfolgen").
  • 6. Die Schaltglieder des EIN-Tasters liegen nicht in der Leitung, die mit dem Schutzleitersystem verbunden werden soll. Dies ist nach DIN EN 60204 Kap. 9.1.4 nicht zulässig.
  • 7. Ein Erdschluß an zwei von drei Leitungen zum EIN-Taster wird durch Ansprechen des Überstromschutzorgans sofort erkannt, falls die Leitungen am Anschluß des Öffnerkontakts des EIN-Tasters betroffen sind. Falls nur die Leitung am Schließerkontakt des EIN-Tasters betroffen ist, wird ein Erdschluß durch Ausfall des Antriebs vom zweiten Hilfsschütz wegen überhöhter Spannung nach einiger Zeit erkannt.
  • 8. Die Sicherheit ist gegenüber Schaltungen mit nur einem Schließer erhöht, weil ein Querschluß zwischen zwei von drei Leitungen zum EIN-Taster beim nächsten Start erkannt wird. Die Leitung zum EIN-Taster und der EIN-Taster selbst ist also querschlußsicher aufgebaut.
    • The claimed safety combination has the following advantages:
  • 1. The number of enabling circuits is as high as a switching device according to the latest technical standard can have a maximum of no contacts, less three and less any necessary reporting circuits (eg relay with 10 contacts results in 7 enabling circuits).
  • 2. The number of detection zones can correspond to a maximum of the number of release zones, minus one, with which an release zone is to be implemented.
  • 3. The ON button is not continuously monitored, ie an interruption in the line to the ON button does not result in the machine (s) being switched off.
  • 4. In the event of line interruptions followed by touching the interrupted lines do not result in the release and thus the start of the machine (s). Line interruptions to the ON button are therefore recognized in good time.
  • 5. The ON button does not only contain an NC contact, which is what DIN EN 60204 chap. 9.2.1 is not permitted ("Start functions must be carried out by energizing the respective circuit").
  • 6. The switching elements of the ON button are not in the line that is to be connected to the protective conductor system. This is according to DIN EN 60204 Chap. 9.1.4 not permitted.
  • 7. A ground fault on two of three lines to the ON button is immediately recognized by the overcurrent protection device responding if the lines at the connection of the NC contact of the ON button are affected. If only the line at the NO contact of the ON button is affected, an earth fault due to drive failure by the second auxiliary contactor due to excessive voltage is recognized after some time.
  • 8. The safety is increased compared to circuits with only one normally open contact, because a short circuit between two of three lines to the ON button is detected at the next start. The line to the ON button and the ON button itself is therefore cross-circuit proof.

    • Die Schaltung entspricht dem Sicherheitsstandard bisher bekannter Schaltungen dieser Art. Die Selbstüberwachung wird vorteilhafterweise durch den Einsatz eines Kondensators als Energiespeicher erreicht, der die Gedächtnisfunktion des üblicherweise dritten Schützes übernimmt.The circuit corresponds to the security standard known to date Circuits of this type. The self-monitoring will advantageously by using a capacitor as Energy storage reached, the memory function of the usually takes over third contactor.

    Weitere vorteilhafte Ausgestaltungen der Erfindung sind den Unteransprüchen zu entnehmen.Further advantageous embodiments of the invention are the See subclaims.

    Ausführungsbeispiele der Erfindung werden im folgenden anhand einer Zeichnung näher erläutert.Exemplary embodiments of the invention are described below a drawing explained in more detail.

    Die Zeichnung zeigt eine zweikanalige NOT-AUS-Schaltung mit einer an einen Wechselspannungsanschluß angeschlossenen Gleichrichteinrichtung 25. Die NOT-AUS-Schaltung besteht im wesentlichen aus zwei parallel geschalteten Strompfaden, die über zwei Öffnerkontakte 3,4 eines NOT-AUS-Schalters in Verbindung stehen. Im ersten Strompfad liegt eine Spule a eines ersten Hilfsschützes, im zweiten Strompfad eine Spule b eines zweiten Hilfsschützes. Beiden Spulen a und b ist jeweils eine Parallelschaltung aus einem Schließer- und einem Öffnerkontakt vorgeschaltet. Der erste Strompfad ist in der genannten Reihenfolge durch die Reihenschaltung der erwähnten Parallelschaltung, die Spule b und einen ohmschen Widerstand 24 gebildet, der direkt mit dem Minuspol 2 der Gleichrichteinrichtung 25 verbunden ist. Der Verbindungspunkt zwischen dem Widerstand 24 und der Spule b trägt das Bezugszeichen 26. Die der Spule a vorgeschaltete Parallelschaltung besteht aus einem Schließerkontakt Ka2 des ersten Hilfsschützes und einem Öffnerkontakt Kb1 des zweiten Hilfsschützes.The drawing shows a two-channel EMERGENCY STOP circuit with a rectifier 25 connected to an 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 . In the first current path there is a coil a of a first auxiliary contactor, in the second current path there is a coil b of a second auxiliary contactor. Both coils a and b are each connected in parallel from a make contact and a break contact. The first current path is formed in the order mentioned by the series connection of the parallel connection mentioned, the coil b and an ohmic resistor 24 which is connected directly to the negative pole 2 of the rectifying device 25. The connection point between the resistor 24 and the coil b bears the reference numeral 26. The parallel connection upstream of the coil a consists of a normally open contact K a2 of the first auxiliary contactor and an normally closed contact K b1 of the second auxiliary contactor.

    Die der Spule b vorgeschaltete Parallelschaltung besteht aus einem Öffnerkontakt Ka1 des ersten Hilfsschützes und einem Schließerkontakt Kb2 des zweiten Hilfsschützes, wobei diese Parallelschaltung mit Hilfe eines Öffnerkontakts 5 eines EIN-Tasters gebildet ist. Dieser Öffnerkontakt 5 liegt vorteilhafterweise nicht auf der Seite, die mit dem Schutzleitungssystem verbunden werden soll.The parallel connection upstream of the coil b consists of an NC contact K a1 of the first auxiliary contactor and a NO contact K b2 of the second auxiliary contactor, this parallel connection being formed with the help of an NC contact 5 of an ON button. This break contact 5 is advantageously not on the side that is to be connected to the protective line system.

    Über den Öffnerkontakt 3 des NOT-AUS-Schalters liegt der zweite Strompfad, der durch die Reihenschaltung der erwähnten zweiten Parallelschaltung, die Spule b und den ohmschen Widerstand 24 in der genannten Reihenfolge gebildet ist, parallel zum ersten Strompfad.Via the break contact 3 of the EMERGENCY STOP switch second current path through the series connection of the mentioned second parallel connection, the coil b and the ohmic Resistor 24 is formed in the order mentioned parallel to the first current path.

    Die parallelen Strompfade sind über eine Sicherung 11 und eine dazu in Reihe liegende Diode 12 mit dem Pluspol 1 der Gleichrichteinrichtung 25 verbunden. Zwischen dem Verbindungspunkt der Diode 12 und der Sicherung 11 einerseits und dem Minuspol 2 andererseits liegt ein ohmscher Widerstand 13, der zusammen mit der Diode 12 eine Reihenschaltung bildet, die durch eine Leuchtdiode 10 und einen weiteren ohmschen Widerstand 14 überbrückt ist.The parallel current paths are via a fuse 11 and a diode 12 in series with the positive pole 1 of the Rectifier 25 connected. Between the connection point the diode 12 and the fuse 11 on the one hand and the negative pole 2, on the other hand, is an ohmic resistor 13, which forms a series circuit together with the diode 12, by a light emitting diode 10 and another ohmic Resistor 14 is bridged.

    Zur Spule a des ersten Hilfsschützes und dem dazu in Reihe geschalteten Öffnerkontakt 4 liegt eine Reihenschaltung aus einer Leuchtdiode 9 und einem ohmschen Widerstand 15 parallel. Zur Reihenschaltung aus der Spule b des zweiten Hilfsschützes und des nachgeschalteten ohmschen Widerstands 24 liegt über den Öffnerkontakt 5 des EIN-Tasters eine Reihenschaltung aus einem weiteren Öffnerkontakt Ka3 des ersten Hilfsschützes, einem ohmschen Widerstand 16 und einem Kondensator 7 in der genannten Reihenfolge parallel. Die Serienschaltung aus dem Widerstand 16 und dem Öffnerkontakt Ka3 ist durch eine Zenerdiode 8 überbrückt, über die der Kondensator 7 entladen werden kann. Parallel zur Spule b des zweiten Hilfsschützes liegt ein ebenfalls zum EIN-Taster gehörender Schließerkontakt 21.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 and the normally closed contact 4 connected to it. For series connection from the coil b of the second auxiliary contactor and the downstream ohmic resistor 24, a series circuit comprising a further break contact K a3 of the first auxiliary contactor, an ohmic resistor 16 and a capacitor 7 is connected in parallel in the order mentioned via the break contact 5 of the ON button. The series connection of the resistor 16 and the break contact K a3 is bridged by a Zener diode 8, via which the capacitor 7 can be discharged. Parallel to the coil b of the second auxiliary contactor is a normally open contact 21, which also belongs to the ON button.

    Zur Wirkungsweise der beschriebenen Sicherheitskombination ist folgendes auszuführen: Bei Anlegen einer Wechselspannung und geschlossenem NOT-AUS-Schalter, d.h. nicht betätigten, entriegelten Öffnerkontakten 3,4 ist die Strombahn für beide Spulen a,b geschlossen, und beide Hilfsschütze ziehen daher an. Durch unterschiedliche Dimensionierung der Spulenwiderstande beider Spulen a,b wird erreicht, daß stets das zweite Hilfsschütz als erstes anzieht, selbst wenn beide Hilfsschütze über den NOT-AUS-Schalter gleichzeitig betätigt werden. Sobald der Öffnerkontakt Kb1 des zweiten Hilfsschützes vor der Spule a öffnet, kann das erste Hilfsschütz nicht mehr anziehen, so daß bei einem schnelleren Anzug des zweiten Hilfsschützes gewährleistet ist, daß nur dieses anzieht.The following must be carried out for the mode of operation of the described safety combination: When an AC voltage is applied and the EMERGENCY STOP switch is closed, that is to say when the unlocked break contacts 3, 4 are not actuated, the current path is closed for both coils a, b, and both auxiliary contactors therefore pick up. Different dimensions of the coil resistances of both coils a, b ensure that the second auxiliary contactor always picks up first, even if both auxiliary contactors are actuated simultaneously via the EMERGENCY STOP switch. As soon as the break contact K b1 of the second auxiliary contactor opens in front of the coil a, 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.

    In dieser Phase, in der nur das zweite Hilfsschütz angezogen ist, wird der Kondensator 7 über die noch geschlossenen Öffnerkontakte Ka1 und Ka3 des ersten Hilfsschützes aufgeladen.In this phase, in which only the second auxiliary contactor is energized, the capacitor 7 is charged via the normally closed normally closed contacts K a1 and K a3 of the first auxiliary contactor.

    Durch anschließende Betätigung des EIN-Tasters erfolgt die Entregung des zweiten Hilfsschützes, indem die Spule b über den aktivierten Schließerkontakt 21 spannungslos gemacht wird. Das erste Hilfsschütz zieht währenddessen an. Zu diesem Zeitpunkt ist der parallel zur Spule b des zweiten Hilfsschützes liegende Kondensator 7 durch die vorherige Anregung desselben bereits aufgeladen. Eine Entladung des Kondensators 7 wird einerseits dadurch verhindert, daß der Öffnerkontakt 5 des EIN-Tasters die Verbindung zum Minuspol 2 hin unterbricht und weil andrerseits nach Abfallen des zweiten Hilfsschützes das erste anzieht, so daß auch zum Pluspol 1 hin die Verbindung unterbrochen ist.Then press the ON button De-excitation of the second contactor by the coil b over the activated NO contact 21 de-energized becomes. The first auxiliary contactor picks up in the meantime. To this The time is parallel to the coil b of the second auxiliary contactor lying capacitor 7 by the previous excitation already charged. A discharge of the capacitor 7 is prevented on the one hand by the break contact 5 the ON button interrupts the connection to negative pole 2 and because on the other hand after the second auxiliary contactor has dropped out the first attracts so that the connection to the positive pole 1 is interrupted.

    Wird der EIN-Taster losgelassen, d.h. der Öffnerkontakt 5 wieder geschlossen, so bleibt das erste Hilfsschütz aufgrund des Selbsthaltekontaktes Ka2 in der Stellung EIN und das zweite Hilfsschütz wird durch den Entladestrom des Kondensators 7 erregt und zieht ebenfalls an. Die NOT-AUS-Schaltung besteht aus zwei Hilfsschützen, wobei das eine zwei und das andere drei Schaltglieder benötigt. Demzufolge lassen sich mit nur zwei vierpoligen Hilfsschützen ein Freigabekreis mit je zwei Schließern in Reihe sowie ein Meldekreis mit einem Schließer realisieren.If the ON button is released, ie the normally closed contact 5 is closed again, the first auxiliary contactor remains in the ON position due to the self-holding contact K a2 and the second auxiliary contactor is excited by the discharge current of the capacitor 7 and also picks up. The EMERGENCY STOP circuit consists of two auxiliary contactors, one of which requires two and the other three switching elements. As a result, an enabling circuit with two NO contacts in series and a signaling circuit with one NO contact can be implemented with just two four-pole auxiliary contactors.

    Die vorliegende NOT-AUS-Schaltung hat den Vorteil, daß selbst bei einem Verschweißen von Schließerkontakten des ersten Hilfsschützes und anschließendem Entriegeln der NOT-AUS-Öffnerkontakte 3,4 das zweite Hilfsschütz nicht mehr anzieht, da der Kondensator 7 bereits entladen ist. Ein Versetzen der NOT-AUS-Kontakte 3,4 von der Position vor der Schützspule hinter selbige oder umgekehrt, wurde zwar einen automatischen Anlauf verhindern, aber dafür als Nachteil eine Ausschaltverzögerung für das zweite Hilfsschütz im Millisekundenbereich zur Folge haben. Dadurch wäre im Fehlerfall, das heißt bei Verschweißen von Schließerkontakten des ersten Hilfsschützes ein sofortiges Ansprechen der Schaltung nicht mehr gewährleistet.The present EMERGENCY STOP circuit has the advantage that even when the NO contacts of the first are welded Auxiliary contactor and then unlocking the emergency stop opener contacts 3,4 the second auxiliary contactor no longer picks up because the capacitor 7 is already discharged. Moving the EMERGENCY STOP contacts 3,4 from the position in front of the contactor coil behind the same or vice versa, was an automatic Prevent starting, but as a disadvantage a switch-off delay for the second auxiliary contactor in the millisecond range have as a consequence. This would result in the event of an error, i.e. Welding NO contacts of the first auxiliary contactor an immediate response of the circuit is no longer guaranteed.

    Die Spannungsanschaltung an den Anschlüssen 1,2 wird auf einfache Weise durch die Leuchtdiode 10 überwacht und angezeigt. Die Leuchtdiode 9 macht die Anregung des ersten Hilfsschützes sichtbar. The voltage connection at terminals 1,2 is simple Monitored and displayed by the LED 10. The LED 9 excites the first auxiliary contactor visible.

    Der EIN-Taster ist derart geschaltet, daß ein Erdschluß an den ihm zugeführten Leitungen und im EIN-Taster zum Öffnen des Freigabekreises führt. Der Fehlertyp "Querschluß" zwischen den Leitungen zum EIN-Taster wird beim nächsten Startkommando mit dem EIN-Taster erkannt, indem keine Freigabe erfolgen kann.The ON button is switched so that an earth fault is present the cables fed to it and in the ON button to open it of the release group. The error type "cross circuit" between the lines to the ON button will be activated at the next start command recognized with the ON button by no release can be done.

    Außerdem führen Leitungsunterbrechungen in einer der Leitungen zum EIN-Taster mit anschließendem Berühren der unterbrochenen Leitung bei geschlossenem Stromkreis nicht zur Freigabe des Laststromkreises.There are also line breaks in one of the lines to the ON button and then touching the interrupted Line not closed for release when circuit is closed of the load circuit.

    Die Anzahl der Freigabekreise ist um drei gegenüber der Anzahl an Schließern reduziert, die ein Schaltgerät nach jeweils neuestem Stand maximal aufweist.The number of release circles is three compared to the number on NO contacts, which a switching device after each state of the art.

    Claims (4)

    1. Safety combination with auxiliary contactors for enabling a drive, wherein a first safety contact or EMERGENCY-STOP contact (3) is connected in series upstream or downstream of at least one of the coils (a, b) of two auxiliary contactors, a first normally closed contact (Kb1) of the second auxiliary contactor being connected in series to the coil (a) of the first auxiliary contactor and a first normally closed contact (Ka1) of the first auxiliary contactor being connected in series to the coil (b) of the second auxiliary contactor, characterised in that the coil (a) of the first auxiliary contactor comprises a second (4) safety contact or EMERGENCY-STOP contact connected in series downstream and coupled to the first (3) safety contact or EMERGENCY-STOP contact, in that a normally closed contact (5) of an ON push-button is connected in series to the coil (b) of the second auxiliary contactor, in that a normally open contact (Ka2) of the first auxiliary contactor is located parallel to the normally closed contact (Kb1) of the second auxiliary contactor, in that a normally open contact (Kb2) is located parallel to the normally closed contact (Ka1) of the first auxiliary contactor, in that means are provided, by virtue of which the second auxiliary contactor always comes into operation before the first when the auxiliary contactors are actuated, and in that an ON push-button with a normally open contact (21) is connected to the coil (b) of the second auxiliary contactor.
    2. Safety combination according to Claim 1,
      characterised in that a normally closed contact (5) pertaining to the ON push-button is located between the energy store (7) and the coil (b) of the second auxiliary contactor.
    3. Safety combination according to Claim 1 or 2,
      characterised in that an overcurrent protective device is provided which responds in the event of earth leakage in the supply line (22) and the return line (23) of the normally closed contact (21).
    4. Safety combination according to one of the preceding claims, characterised in that a resistor (24) is located between negative pole (2) and coil (b) of the second auxiliary contactor and the normally open contact (21) is conducted to a junction point (26) between the coil (b) and the resistor (24).
    EP95120011A 1995-01-09 1995-12-19 Safety combination Expired - Lifetime EP0721200B1 (en)

    Applications Claiming Priority (2)

    Application Number Priority Date Filing Date Title
    DE19500396 1995-01-09
    DE19500396A DE19500396C1 (en) 1995-01-09 1995-01-09 Safety control circuit for opening or clearing of drives

    Publications (2)

    Publication Number Publication Date
    EP0721200A1 EP0721200A1 (en) 1996-07-10
    EP0721200B1 true EP0721200B1 (en) 1999-03-03

    Family

    ID=7751151

    Family Applications (1)

    Application Number Title Priority Date Filing Date
    EP95120011A Expired - Lifetime EP0721200B1 (en) 1995-01-09 1995-12-19 Safety combination

    Country Status (3)

    Country Link
    EP (1) EP0721200B1 (en)
    JP (1) JPH08291895A (en)
    DE (2) DE19500396C1 (en)

    Families Citing this family (6)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    DE19715013B4 (en) * 1997-04-11 2008-04-10 Schneider Electric Gmbh Circuit for starting a machine and method for controlling a start of a machine
    DE19751674C2 (en) * 1997-09-17 2000-05-11 Schneider Electric Gmbh Circuit arrangement with safety function
    DE19930994B4 (en) * 1999-07-05 2006-03-02 Leuze Lumiflex Gmbh + Co. Kg Circuit arrangement for monitoring relays in safety circuits with at least 3 relays
    DE10037383A1 (en) * 2000-08-01 2002-02-21 Pilz Gmbh & Co Safety switching device for safely switching off an electrical consumer, in particular an electrically driven machine
    JP3757208B2 (en) * 2003-02-07 2006-03-22 ファナック株式会社 Emergency stop circuit
    DE102008002758B4 (en) * 2008-01-25 2016-04-28 Schneider Electric Automation Gmbh relay circuit

    Family Cites Families (3)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    DE3933699C2 (en) * 1989-10-09 1998-12-03 Siemens Ag Contactor safety combination
    DE4337665C1 (en) * 1993-11-04 1994-10-20 Siemens Ag Contactor safety combination
    DE4413676C1 (en) * 1994-04-20 1995-09-21 Siemens Ag Contactor safety combination

    Also Published As

    Publication number Publication date
    EP0721200A1 (en) 1996-07-10
    DE19500396C1 (en) 1996-02-01
    DE59505197D1 (en) 1999-04-08
    JPH08291895A (en) 1996-11-05

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