EP0792512B1 - Protective safety combination - Google Patents

Protective safety combination Download PDF

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Publication number
EP0792512B1
EP0792512B1 EP95935853A EP95935853A EP0792512B1 EP 0792512 B1 EP0792512 B1 EP 0792512B1 EP 95935853 A EP95935853 A EP 95935853A EP 95935853 A EP95935853 A EP 95935853A EP 0792512 B1 EP0792512 B1 EP 0792512B1
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EP
European Patent Office
Prior art keywords
contactor
contact
relay
coil
safety
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Legal status (The legal status 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 status listed.)
Expired - Lifetime
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EP95935853A
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German (de)
French (fr)
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EP0792512A1 (en
Inventor
Ralph-Ronald GÖBEL
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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 contactor safety combination with auxiliary contactors to release a drive in which a first safety or EMERGENCY STOP contact at least one the coils of two auxiliary contactors are connected upstream or downstream, the coil of the first auxiliary contactor an NC contact of the second auxiliary contactor and the coil of the second auxiliary contactor a first break contact of the first contactor in Series is connected.
  • this contactor safety combination When a voltage is applied to this contactor safety combination pulls the first auxiliary contactor and thus closes the one in series with the coil of the second auxiliary contactor NO contact.
  • the actuation of an upstream of this ON button causes the second auxiliary contactor to pull in.
  • the current path also the coil of the third Auxiliary contactor closed and at the same time the current path of the First auxiliary contactor coil interrupted.
  • the auxiliary contactors are mutually monitored.
  • a drive is activated Approved.
  • the circuit already has four Switching elements per auxiliary contactor occupied. With three, for example eight-pole auxiliary contactors can thus be four enabling circuits realize.
  • the invention has for its object a contactor safety combination of the above type to create the Series connection of a protective door and EMERGENCY STOP circuit with allows as little effort as possible.
  • the task becomes solved that the coil of the first contactor one downstream second coupled with the first security or EMERGENCY STOP contact that the coil of the second Auxiliary contact an NC contact of an ON button in series is switched that the break contact of the second auxiliary contactor a normally open contact of the auxiliary contactor in parallel is that the break contact of the first contactor Normally open contact is parallel, that means are provided by the second when the auxiliary contactors are actuated
  • Auxiliary contactor picks up in front of the first one and that an energy store in operative connection with the coil of the second auxiliary contactor the contactor safety combination after voltage connections and then pressing the ON button the second auxiliary contactor excited and in the state of Self-hold transferred.
  • the circuit is self-monitoring even with volatile errors. It therefore corresponds to the security standard so far known circuits of this type.
  • the self-monitoring is advantageously by using a capacitor as Energy storage reached, the memory function of the usually takes over third contactor.
  • 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 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 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 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.
  • the parallel current paths are via a fuse 11 and a diode 12 in series with this is connected to the positive pole 1.
  • an ohmic Resistor 13 which is connected in series with the diode 12 forms by a light emitting diode 10 and one 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.
  • 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 a3 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 a3 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 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 and 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 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, 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.
  • FIG 2 shows the execution of a two-channel system according to the invention Protective door circuit shown. It is different of the EMERGENCY STOP circuit according to FIG 1 only in that the NC contacts 3.4 now depending on the position of one Protective door can be switched.
  • the two switching elements 3.4 are in accordance with the position of the protective door shown open state also open.
  • FIG 3 shows a two-channel EMERGENCY STOP circuit for AC voltage connection with a transformer 18 and one in Series connected rectifier bridge 19 through which AC voltage is transformed down on the one hand and the AC is rectified. Otherwise also true this circuit completely with the one shown in FIG 1 and needs therefore no further explanation.

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

Description

Die Erfindung bezieht sich auf eine Schützsicherheitskombination 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 contactor safety combination with auxiliary contactors to release a drive in which a first safety or EMERGENCY STOP contact at least one the coils of two auxiliary contactors are connected upstream or downstream, the coil of the first auxiliary contactor an NC contact of the second auxiliary contactor and the coil of the second auxiliary contactor a first break contact of the first contactor in Series is connected.

Schützsicherheitskombinationen 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.Contactor 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 Schützsicherheitskombination 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 contactor safety combination pulls the first auxiliary contactor and thus closes the one in series with the coil of the second auxiliary contactor NO contact. The actuation of an upstream of this ON button causes the second auxiliary contactor to pull in. Thereupon, by closing a normally open contact the second auxiliary contactor the current path also the coil of the third Auxiliary contactor closed and at the same time the current path of the First auxiliary contactor coil interrupted. In this way the auxiliary contactors are mutually monitored. Just if all three auxiliary contactors are functional, a drive is activated Approved. The circuit already has four Switching elements per auxiliary contactor occupied. With three, for example eight-pole auxiliary contactors can thus be four enabling circuits realize.

Bei einer demgegenüber verbesserten Schützsicherheitskombination 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 Schützsicherheitskombination 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 contactor safety combination according to the unpublished German patent application P 43 37 665.7 are the switching elements of the auxiliary contactors exploited more efficiently, which is at least the realization an enabling circuit with three four-pole auxiliary contactors enables. Here too the control voltage is one-sided lying coils of three auxiliary contactors a safety or Emergency stop contact upstream, and the coil of the first Auxiliary contactor is the series connection of NC contacts upstream of the second and third auxiliary contactors. The difference to known contactor safety combination according to DE-OS 39 33 699 is the parallel coils of the second and third auxiliary contactors from a series connection Normally open contacts of the second and third auxiliary contactors. It is also parallel to this series connection a normally open contact of the first contactor in series with a normally open contact of an ON button.

Der Erfindung liegt die Aufgabe zugrunde, eine Schützsicherheitskombination der obengenannten Art zu schaffen, die die Reihenschaltung einer Schutztür- und NOT-AUS-Schaltung mit möglichst geringem Aufwand ermöglicht. 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 ein Energiespeicher in Wirkverbindung mit der Spule des zweiten Hilfsschützes steht, der nach Spannungszuschaltungen die Schützsicherheitskombination und einer anschließenden Betätigung des EIN-Tasters das zweite Hilfsschütz erregt und in den Zustand der Selbsthaltung überführt.The invention has for its object a contactor safety combination of the above type to create the Series connection of a protective door and EMERGENCY STOP circuit with allows as little effort as possible. The task becomes solved that the coil of the first contactor one downstream second coupled with the first security or EMERGENCY STOP contact that the coil of the second Auxiliary contact an NC contact of an ON button in series is switched that the break contact of the second auxiliary contactor a normally open contact of the auxiliary contactor in parallel is that the break contact of the first contactor Normally open contact is parallel, that means are provided by the second when the auxiliary contactors are actuated Auxiliary contactor picks up in front of the first one and that an energy store in operative connection with the coil of the second auxiliary contactor the contactor safety combination after voltage connections and then pressing the ON button the second auxiliary contactor excited and in the state of Self-hold transferred.

Die Schützsicherheitskombination gemäß Patentanspruch 1 weist folgende Vorteile auf:

  • 1. Mit nur zwei vierpoligen Hilfsschützen lassen sich ein Freigabekreis mit zwei Schließerkontakten in Reihe und ein Meldekreis mit einem Schließer- oder Öffnerkontakt verwirklichen.
  • 2. Durch die Ausbildung des NOT-AUS-Schalters mit zwei Öffnerkontakten in der beschriebenen Weise wird eine Zweikanaligkeit erreicht, d.h. mit jedem der beiden Öffnerkontakte kann der Freigabekreis ausgeschaltet werden.
  • 3. Die Sicherheitskombination gewährt auch Sicherheit bei einem Querschluß, durch den z.B. die Reihenschaltung aus dem Öffnerkontakt des NOT-AUS-Tasters und dem Öffnerkontakt des EIN-Tasters kurzgeschlossen ist.
  • 4. Es erfolgt eine Selbstüberwachung des EIN-Tasters, d.h. bei Kurzschluß des Öffnerkontakts vom EIN-Taster ist die Schaltung nicht mehr funktionsfähig.
  • 5. Die Schützsicherheitskombination ermöglicht die Realisierung einer Schutztür- und NOT-AUS-Schaltung mit nur zwei Schützen.
    • The contactor safety combination according to claim 1 has the following advantages:
  • 1. With just two four-pole contactors, an enabling circuit with two NO contacts in series and a signaling circuit with a NO or NC contact can be implemented.
  • 2. By designing the EMERGENCY STOP switch with two break contacts in the manner described, a two-channel system is achieved, ie the enabling circuit can be switched off with each of the two break contacts.
  • 3. The safety combination also guarantees safety in the event of a short circuit, for example, by which the series connection of the break contact of the EMERGENCY STOP button and the break contact of the ON button is short-circuited.
  • 4. The ON button is self-monitored, ie if the NC contact of the ON button is short-circuited, the circuit is no longer functional.
  • 5. The contactor safety combination enables the implementation of a protective door and EMERGENCY STOP circuit with only two contactors.

    • Auch bei flüchtigen Fehlern wirkt die Schaltung selbstüberwachend. Sie entspricht daher 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 is self-monitoring even with volatile errors. It therefore corresponds to the security standard so far known circuits of this type. The self-monitoring is 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. Es zeigen:

    FIG 1
    Eine erfindungsgemäße Schützsicherheitskombination als zweikanalige NOT-AUS-Schaltung zum Gleichspannungsanschluß,
    FIG 2
    eine erfindungsgemäße zweikanalige Schutztürschaltung zum Gleichspannungsanschluß und
    FIG 3
    eine zweikanalige NOT-AUS-Schaltung zum Wechselspannungsanschluß.
    Exemplary embodiments of the invention are explained in more detail below with reference to a drawing. Show it:
    FIG. 1
    A contactor safety combination according to the invention as a two-channel EMERGENCY STOP circuit for DC voltage connection,
    FIG 2
    an inventive two-channel protective door circuit for DC voltage connection and
    FIG 3
    a two-channel EMERGENCY STOP circuit for AC connection.

    FIG 1 zeigt eine zweikanalige NOT-AUS-Schaltung mit einem durch einen Pluspol 1 und einen Minuspol 2 gebildeten Gleichspannungsanschluß. 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 den Öffnerkontakt 5 gebildet, der direkt mit dem Minuspol 2 verbunden ist. Die der Spule a vorgeschaltete Parallelschaltung besteht aus einem Schließerkontakt Ka2 des ersten Hilfsschützes und einem Öffnerkontakt Kb1 des zweiten Hilfsschützes. 1 shows a two-channel EMERGENCY STOP circuit with a DC voltage connection formed by a positive pole 1 and a negative pole 2. 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 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 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.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.

    Über den Öffnerkontakt 3 des NOT-AUS-Schalters liegt der zweite Strompfad, der durch die Reihenschaltung der erwähnten zweiten Parallelschaltung, die Spule b, einem AUS-Taster 5 und den Öffnerkontakt 4 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, an OFF button 5 and the break contact 4 is formed in the order mentioned is 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 verbunden. Zwischen dem Verbindungspunkt der letztgenannten beiden Schaltungskomponenten und dem Minuspol 2 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 this is connected to the positive pole 1. Between the junction of the latter two Circuit components and the negative pole 2 is an ohmic Resistor 13, which is connected in series with the diode 12 forms by a light emitting diode 10 and one another ohmic resistor 14 is bridged.

    Zur Spule a des ersten Hilfsschützes 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 Öffnerkontakts 5 liegt eine Reihenschaltung aus einem weiteren Öffnerkontakt Ka3 des ersten Hilfsschützes, einem ohmschen Widerstand 16 und einem Kondensator 7 in der genannten Reihenfolge, wobei die Kathode des Kondensators 7 an den Minuspol 2 geschaltet ist. Die Serienschaltung aus dem Widerstand 16 und dem Öffnerkontakt Ka3 ist durch eine Zenerdiode 8 überbrückt, über die der Kondensator 7 entladen werden kann.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. For the 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 a3 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 a3 is bridged by a Zener diode 8, via which the capacitor 7 can be discharged.

    Zur Wirkungsweise der beschriebenen Schützsicherheitskombination ist folgendes auszuführen: Bei Anlegen einer Gleichspannung an die beiden Pole 1,2 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 Spulenwiderstände 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 contactor safety combination described: When a direct voltage is applied to the two poles 1, 2 and the EMERGENCY STOP switch is closed, that is to say the unlocked break contacts 3, 4 are not actuated, the current path is closed for both coils a, b, and both Auxiliary contactors therefore attract. 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 öffnet der Öffnerkontakt 5 und das zweite Hilfsschütz wird zum Abfallen gebracht, während das erste Hilfsschütz anziehen kann. 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 des zweiten Schutzes 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 to open the NC contact 5 and the second auxiliary contactor will drop out brought while the first auxiliary contactor can pick up. To at this point in time, it is parallel to coil b of the second Auxiliary contactor lying capacitor 7 through the previous one Excitation already charged. A discharge of the Capacitor 7 is prevented on the one hand by the fact that NC contact 5 of the ON button connects the second Protection to negative pole 2 interrupts and because on the other hand after the second auxiliary contactor drops out, the first one picks up, see above 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, wie im rechten Teil der FIG 1 angedeutet. 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. Accordingly, with only two four-pole auxiliary contactors, an enabling circuit with two NO contacts in series and a signaling circuit with one NO contact can be implemented, as indicated in the right part of FIG. 1.

    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, würde 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, 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.

    In FIG 2 ist die Ausführung einer erfindungsgemäßen zweikanaligen Schutztür-Schaltung dargestellt. Sie unterscheidet sich von der NOT-AUS-Schaltung gemäß FIG 1 nur dadurch, daß die Öffnerkontakte 3,4 nun in Abhängigkeit von der Stellung einer Schutztür geschaltet werden. Die beiden Schaltglieder 3,4 sind entsprechend der gezeigten Stellung der Schutztür im geöffneten Zustand ebenfalls geöffnet.2 shows the execution of a two-channel system according to the invention Protective door circuit shown. It is different of the EMERGENCY STOP circuit according to FIG 1 only in that the NC contacts 3.4 now depending on the position of one Protective door can be switched. The two switching elements 3.4 are in accordance with the position of the protective door shown open state also open.

    FIG 3 zeigt eine zweikanalige NOT-AUS-Schaltung für Wechselspannungsanschluß mit einem Transformator 18 und einer in Reihe dazu geschalteten Gleichrichterbrücke 19, durch die die Wechselspannung einerseits heruntertransformiert wird und der Wechselstrom gleichgerichtet wird. Ansonsten stimmt auch diese Schaltung völlig mit der gemäß FIG 1 ein und bedarf somit keiner weiteren Erläuterung.3 shows a two-channel EMERGENCY STOP circuit for AC voltage connection with a transformer 18 and one in Series connected rectifier bridge 19 through which AC voltage is transformed down on the one hand and the AC is rectified. Otherwise also true this circuit completely with the one shown in FIG 1 and needs therefore no further explanation.

    Claims (9)

    1. Contactor safety combination having contactor relays for enabling an operating mechanism, in which contactor safety combination a first safety contact or emergency OFF contact (3) is connected upstream or downstream of at least one of the coils (a, b) of two contactor relays, with a break contact (Kb1) of the second contactor relay being connected in series with the coil (a) of the first contactor relay, and a first break contact (Ka1) of the first contactor relay being connected in series with the coil (b) of the second contactor relay, characterised in that the coil (a) of the first contactor relay has a downstream second (4) safety contact or emergency OFF contact that is coupled with the first (3) safety contact or emergency OFF contact, in that there is connected in series with the coil (b) of the second contactor relay a break contact (5) of an ON button, in that there lies in parallel with the break contact (Kb1) of the second contactor relay a make contact (Ka2) of the first contactor relay, in that there lies in parallel with the break contact (Ka1) of the first contactor relay a make contact (Kb2), in that there are provided means, by means of which the second contactor relay always picks up before the first when the contactor relays are actuated, and in that there is operatively connected to the coil (4) of the second contactor relay an energy store (7) which excites and transfers into the state of locking the contactor safety combination after voltage connections and the second contactor relay after a subsequent actuation of the ON button.
    2. Contactor safety combination according to claim 1, characterised in that the energy store is constructed as a capacitor (7).
    3. Contactor safety combination according to claim 1 or 2, characterised in that there is connected in parallel with the series circuit arrangement consisting of the coil (6 (sic)) of the second contactor relay and the break contact (5) of the ON button a series circuit arrangement consisting of a second break contact (Ka3) of the first contactor relay, an ohmic resistance (16) and the capacitor (7).
    4. Contactor safety combination according to one of the preceding claims, characterised in that there lies in parallel with the series circuit arrangement consisting of the resistance (16) and the second break contact (Ka3) a diode (8), by way of which the capacitor (7) can be discharged via the coil (6 (sic)) of the second contactor relay.
    5. Contactor safety combination according to one of the preceding claims, characterised in that the means, by means of which the second contactor relay always picks up before the first when the contactor relays are actuated, consist in that the resistances of the two coils (a, b) are differently dimensioned.
    6. Contactor safety combination according to one of the preceding claims, characterised in that there is connected in parallel with the coil (a) of the first contactor relay a first light-emitting diode (9).
    7. Contactor safety combination according to one of the preceding claims, characterised in that there is connected in parallel with the control-voltage terminal (1, 2) of the contactor safety combination a second light-emitting diode (10).
    8. Contactor safety combination according to one of the preceding claims, characterised in that the ON button is connected so as to be self-monitoring.
    9. Contactor safety combination according to one of the preceding claims, characterised in that the emergency OFF contacts are contacts (3, 4) which are dependent on the position of a protective door.
    EP95935853A 1994-11-18 1995-11-07 Protective safety combination Expired - Lifetime EP0792512B1 (en)

    Applications Claiming Priority (3)

    Application Number Priority Date Filing Date Title
    DE4441171A DE4441171C1 (en) 1994-11-18 1994-11-18 Combined protection and safety circuit for electrical drive
    DE4441171 1994-11-18
    PCT/DE1995/001539 WO1996016422A1 (en) 1994-11-18 1995-11-07 Protective safety combination

    Publications (2)

    Publication Number Publication Date
    EP0792512A1 EP0792512A1 (en) 1997-09-03
    EP0792512B1 true EP0792512B1 (en) 1998-05-20

    Family

    ID=6533624

    Family Applications (1)

    Application Number Title Priority Date Filing Date
    EP95935853A Expired - Lifetime EP0792512B1 (en) 1994-11-18 1995-11-07 Protective safety combination

    Country Status (4)

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

    Families Citing this family (6)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    DE19948632B4 (en) * 1999-10-08 2005-08-11 Siemens Ag Actuator with a basic actuator, a Zusatzaktor and a drive unit
    US6388860B1 (en) * 2000-02-17 2002-05-14 Deere & Company Dual switch control system
    DE10110467C1 (en) * 2001-03-05 2002-08-29 Matsushita Electric Works Europe Ag Magnetic system for an electromagnetic relay
    EP1174897A3 (en) 2000-07-19 2004-01-28 Matsushita Electric Works (Europe) Aktiengesellschaft Magnetic system for electromagnetic relay
    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
    FR3095548B1 (en) 2019-04-24 2021-05-07 Clearsy Secure switch

    Family Cites Families (5)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    DE3541338A1 (en) * 1985-11-22 1987-05-27 Pepperl & Fuchs Circuit having self-monitoring
    DE3933699C2 (en) * 1989-10-09 1998-12-03 Siemens Ag Contactor safety combination
    DE3937122C2 (en) * 1989-11-10 1997-12-18 Elan Schaltelemente Gmbh Circuit arrangement with safety function
    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
    JPH10508977A (en) 1998-09-02
    WO1996016422A1 (en) 1996-05-30
    DE4441171C1 (en) 1996-02-08
    DE59502282D1 (en) 1998-06-25
    EP0792512A1 (en) 1997-09-03

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