EP0678889B1 - Contactor safety combination - Google Patents
Contactor safety combination Download PDFInfo
- Publication number
- EP0678889B1 EP0678889B1 EP95105460A EP95105460A EP0678889B1 EP 0678889 B1 EP0678889 B1 EP 0678889B1 EP 95105460 A EP95105460 A EP 95105460A EP 95105460 A EP95105460 A EP 95105460A EP 0678889 B1 EP0678889 B1 EP 0678889B1
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- EP
- European Patent Office
- Prior art keywords
- contactor
- contact
- coil
- safety
- relay
- Prior art date
- 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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- 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 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 an NC contact of the first auxiliary contactor is connected in series.
- 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. Only at A drive is enabled for all three auxiliary contactors to function. The circuit already has four switching elements per auxiliary contactor. With three, for example, eight-pole contactors, four enabling circuits can 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 which are 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 invention has for its object to provide a contactor safety combination of the type mentioned above, which enables the series connection of a protective door and EMERGENCY STOP circuit with the least possible effort.
- the object is achieved in that the coil of the second auxiliary contactor has a downstream second with the first coupled safety or EMERGENCY STOP contact, to which an NC contact of an ON button is connected in series, that the NC contact of the second auxiliary contactor has a NO contact
- Auxiliary contactor is parallel that the normally closed contact of the first auxiliary contactor is a normally open contact in parallel, means are provided by which the second auxiliary contactor always pulls in before the first one when the auxiliary contactors are actuated, and that the series connection of the coil of the second auxiliary contactor and the second EMERGENCY STOP contact and the break contact of the ON button have an RC Link in the form of a capacitor connected in series with an ohmic resistor is connected in parallel, a diode being connected in parallel with the resistance of the RC link, via which
- the circuit is self-monitoring even with volatile errors. It therefore corresponds to the safety standard of previously known circuits of this type. Self-monitoring is achieved by using the capacitor, which takes over the memory function of the usually third contactor.
- the DC voltage connection for the two-channel EMERGENCY STOP circuit according to FIG. 1 is formed by a positive pole 1 and a negative pole 2.
- An opener contact 3 of an EMERGENCY STOP switch to the positive pole 1 is connected upstream of two coils a, b of a first and second auxiliary contactor.
- a parallel connection of a normally open contact and an normally closed contact is connected directly in front of each of the two coils a, b, which are parallel to one another, and each is electrically connected directly to the normally closed contact 3 of the EMERGENCY STOP switch at its other connection point.
- the parallel connection upstream of the coil a of the first auxiliary contactor consists of an NC contact K b1 of the second auxiliary contactor and a normally open contact K a2 of the first auxiliary contactor.
- the other parallel circuit upstream of the coil b of the second auxiliary contactor has an NC contact K a1 of the first auxiliary contactor and a normally open contact K b2 of the second auxiliary contactor. While the coil a of the first auxiliary contactor is directly connected to the negative pole 2 with its other connection point, there is a series connection of an NC contact 5 of an ON button and another to the EMERGENCY STOP switch between this and the second connection point of the coil b of the second auxiliary contactor associated NC contact 4 switched.
- the coil b of the second contactor, the normally closed contact 5 of the ON button and the second normally closed contact 4 of the EMERGENCY STOP switch form a series circuit to which an ohmic resistor 16 with a capacitor 7 connected in series is connected in parallel.
- a diode 8 is connected in parallel to the ohmic resistor 16 in such a polarized manner that the capacitor 7 can discharge via this and the two normally closed contacts 4, 5 in the closed state.
- Another ohmic resistor 17 is located at the connection point of the normally closed contact 3 of the EMERGENCY STOP switch to the two coils a, b and the negative pole 2.
- the break contact K b1 of the second auxiliary contactor opens in front of the coil a, so that if the second auxiliary contactor pulls in faster, it is ensured that only this pulls in.
- 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. 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. Since the EMERGENCY STOP circuit only requires two auxiliary contactors, each with two switching elements, two enabling circuits with two NO contacts each can be implemented with only two four-pole auxiliary contactors.
- the voltage connection at the connections 1, 2 is monitored and displayed in a simple manner by the LED 10.
- the LED 9 makes the excitation of the first auxiliary contactor visible.
- FIG. 2 shows the execution 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 depending on 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.
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Description
Die Erfindung bezieht sich auf eine Schützsicherheitskombination mit Hilfsschützen zur Freigabe eines Antriebs, bei dem ein erster Sicherheits- oder NOT-AUS-Kontakt den 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 Öffnerkontakt des ersten Hilfsschützes in Reihe geschaltet ist.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 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 an NC contact of the first auxiliary contactor is connected in series.
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 Schießerkontakt des ersten Hilfsschützes und einem weiteren Schließerkontakt des dritten Hilfsschützes in Reihe geschaltet.Contactor safety combinations of the type mentioned above are known from DE-OS-39 33 699. Here 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 connection comprising a further contact of the first auxiliary contact and a further normally open contact of the third contactor.
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, 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. Only at A drive is enabled for all three auxiliary contactors to function. The circuit already has four switching elements per auxiliary contactor. With three, for example, eight-pole contactors, four enabling circuits can be implemented.
Bei einer dem gegenüber verbesserten Schützsicherheitskombination gemäß der DE-C-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.In an improved contactor safety combination according to DE-C-43 37 665.7, 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. Here too, 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. In contrast to known contactor safety combinations according to DE-OS 39 33 699, the coils of the second and third auxiliary contactors which are connected in parallel are preceded by a series connection of normally open contacts of the second and third auxiliary contactors. Furthermore, 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.
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 zweiten Hilfsschützes einen nachgeschalteten zweiten mit dem ersten gekoppelten Sicherheits- oder NOT-AUS-Kontakt aufweist, dem 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 der Reihenschaltung aus der Spule des zweiten Hilfsschützes sowie dem zweiten NOT-AUS-Kontakt und dem Öffnerkontakt des EIN-Tasters ein RC-Glied in Form eines einem ohmschen Widerstand in Reihe geschalteten Kondensators parallel geschaltet ist, wobei zum Widerstand des RC-Gliedes eine Diode parallel liegt über die der Kondensator über die Spule des zweiten Hilfsschützes entladbar ist.The invention has for its object to provide a contactor safety combination of the type mentioned above, which enables the series connection of a protective door and EMERGENCY STOP circuit with the least possible effort. The object is achieved in that the coil of the second auxiliary contactor has a downstream second with the first coupled safety or EMERGENCY STOP contact, to which an NC contact of an ON button is connected in series, that the NC contact of the second auxiliary contactor has a NO contact Auxiliary contactor is parallel that the normally closed contact of the first auxiliary contactor is a normally open contact in parallel, means are provided by which the second auxiliary contactor always pulls in before the first one when the auxiliary contactors are actuated, and that the series connection of the coil of the second auxiliary contactor and the second EMERGENCY STOP contact and the break contact of the ON button have an RC Link in the form of a capacitor connected in series with an ohmic resistor is connected in parallel, a diode being connected in parallel with the resistance of the RC link, via which the capacitor can be discharged via the coil of the second auxiliary contactor.
Die Schützsicherheitskombination gemäß Patentanspruch 1 weist folgende Vorteile auf:
- 1. Mit nur zwei vierpoligen Hilfsschützen lassen sich zwei Freigabekreise mit je zwei Schließerkontakten in Reihe 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.
- 1. With just two four-pole auxiliary contactors, two enabling circuits with two NO contacts each can be implemented in series.
- 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 durch den Einsatz des Kondensators erreicht, der die Gedächtnisfunktion des üblicherweise dritten Schützes übernimmt.The circuit is self-monitoring even with volatile errors. It therefore corresponds to the safety standard of previously known circuits of this type. Self-monitoring is achieved by using the capacitor, which takes over the memory function of the usually third contactor.
Weitere vorteilhafte Ausgestaltungen der Erfindung sind den Unteransprüchen zu entnehmen.Further advantageous embodiments of the invention can be found in the subclaims.
Ausführungsbeispiele der Erfindung werden im folgenden anhand einer Zeichnung näher erläutert. Es zeigen:
- FIG 1
- Eine erfindungsgemäße Schutzsicherheitskombination als zweikanalige NOT-AUS-Schaltung zum Gleichspannungsanschluß,
- FIG 2
- eine erfindungsgemäße zweikanalige Schutztür-Schaltung zum Gleichspannungsanschluß und
- FIG 3
- eine zweikanalige NOT-AUS-Schaltung zum Wechselspannungsanschluß.
- FIG. 1
- A protective 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.
Der Gleichspannungsanschluß für die zweikanalige NOT-AUS-Schaltung gemäß FIG 1 wird durch einen Pluspol 1 und einen Minuspol 2 gebildet. Zwei Spulen a,b eines ersten und zweiten Hilfsschützes ist ein Öffnerkontakt 3 eines NOT-AUS-Schalters zum Pluspol 1 hin vorgeschaltet. Den beiden parallel zueinanderliegenden Spulen a,b ist jeweils eine Parallelschaltung aus einem Schließerkontakt und einem Öffnerkontakt direkt vorgeschaltet und jeweils mit ihrem anderen Anschlußpunkt direkt mit dem Öffnerkontakt 3 des NOT-AUS-Schalters elektrisch verbunden. Die der Spule a des ersten Hilfsschützes vorgeschaltete Parallelschaltung besteht aus einem Öffnerkontakt Kb1 des zweiten Hilfsschützes und einem Schließerkontakt Ka2 des ersten Hilfsschützes. Die andere der Spule b des zweiten Hilfsschützes vorgeschaltete Parallelschaltung weist einen Öffnerkontakt Ka1 des ersten Hilfsschützes und einen Schließerkontakt Kb2 des zweiten Hilfsschützes auf. Während die Spule a des ersten Hilfsschützes mit ihrem anderen Anschlußpunkt direkt an dem Minuspol 2 liegt, ist zwischen diesem und dem zweiten Anschlußpunkt der Spule b des zweiten Hilfsschützes eine Reihenschaltung aus einem Öffnerkontakt 5 eines EIN-Tasters und einem weiteren zum NOT-AUS-Schalter gehörenden Öffnerkontakt 4 geschaltet. Zwischen dem Pluspol 1 und dem Öffnerkontakt 3 des NOT-AUS-Schalters liegt eine Sicherung 11 und eine Diode 12 in der genannten Reihenfolge. 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 über einen weiteren ohmschen Widerstand 14 überbrückt ist. Zur Spule a des ersten Hilfsschützes liegt eine Reihenschaltung aus einer Leuchtdiode 9 und einem ohmschen Widerstand 15 parallel.The DC voltage connection for the two-channel EMERGENCY STOP circuit according to FIG. 1 is formed by a positive pole 1 and a negative pole 2. An opener contact 3 of an EMERGENCY STOP switch to the positive pole 1 is connected upstream of two coils a, b of a first and second auxiliary contactor. A parallel connection of a normally open contact and an normally closed contact is connected directly in front of each of the two coils a, b, which are parallel to one another, and each is electrically connected directly to the normally closed contact 3 of the EMERGENCY STOP switch at its other connection point. The parallel connection upstream of the coil a of the first auxiliary contactor consists of an NC contact K b1 of the second auxiliary contactor and a normally open contact K a2 of the first auxiliary contactor. The other parallel circuit upstream of the coil b of the second auxiliary contactor has an NC contact K a1 of the first auxiliary contactor and a normally open contact K b2 of the second auxiliary contactor. While the coil a of the first auxiliary contactor is directly connected to the negative pole 2 with its other connection point, there is a series connection of an NC contact 5 of an ON button and another to the EMERGENCY STOP switch between this and the second connection point of the coil b of the second auxiliary contactor associated NC contact 4 switched. Between the positive pole 1 and the break contact 3 of the EMERGENCY STOP switch there is a
Die Spule b des zweiten Hilfsschützes, der Öffnerkontakt 5 des EIN-Tasters und der zweite Öffnerkontakt 4 des NOT-AUS-Schalters bilden eine Reihenschaltung, zu der ein ohmscher Widerstand 16 mit einem in Reihe geschalteten Kondensator 7 parallel liegt. Zum ohmschen Widerstand 16 liegt eine Diode 8 derart gepolt parallel, daß sich der Kondensator 7 über diese und die beiden Öffnerkontakte 4,5 im geschlossenen Zustand entladen kann. Ein weiterer ohmscher Widerstand 17 liegt am Verbindungspunkt des Öffnerkontakts 3 des NOT-AUS-Schalters zu den beiden Spulen a,b und dem Minuspol 2.The coil b of the second contactor, the normally closed contact 5 of the ON button and the second normally closed contact 4 of the EMERGENCY STOP switch form a series circuit to which an
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. 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 Schützes zum Minuspol 2 hin unterbricht und weil andererseits nach Abfallen des zweiten Hilfsschützes das erste anzieht, so daß auch zum Pluspol 1 hin die Verbindung unterbrochen ist. 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. Da die NOT-AUS-Schaltung nur zwei Hilfsschütze mit jeweils zwei Schaltgliedern benötigt, lassen sich mit nur zwei vierpoligen Hilfsschützen zwei Freigabekreise mit je zwei Schließern in Reihe realisieren.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, ie the unlocked NC contacts 3, 4 are not actuated, the current path is closed for both coils a, b and both auxiliary contactors therefore attract. By different dimensions of the coil resistances of both coils a, b ensures 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. By subsequently pressing the ON button, the break contact 5 opens and the second auxiliary contactor is made to drop out, while the first auxiliary contactor can pick up. At this time, 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. 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. Since the EMERGENCY STOP circuit only requires two auxiliary contactors, each with two switching elements, two enabling circuits with two NO contacts each can be implemented with only two four-pole auxiliary contactors.
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 the connections 1, 2 is monitored and displayed in a simple manner by the
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 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 depending on 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 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
Claims (6)
- Contactor safety combination having contactor relays for the purpose of enabling a drive, wherein a first safety or EMERGENCY-OFF contact (3) is connected upstream or downstream respectively 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 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 (b) of the second contactor relay has a second safety or EMERGENCY-OFF contact (4), which is downstream and is coupled with the first safety or EMERGENCY-OFF contact (3) and with which a break contact (5) of an ON-button is connected in series, in that a make contact (Ka2) of the first contactor relay is connected in parallel with the break contact (Kb1) of the second contactor relay, in that a make contact (Kb2) is connected in parallel with the break contact (Ka1) of the first contactor relay, in that measures are provided by which in the case of actuation of the contactor relays the second contactor relay always attracts before the first, and in that connected in parallel with the series circuit arrangement consisting of the coil (b) of the second contactor relay and also the second EMERGENCY-OFF contact (4) and the break contact (5) of the ON-button there is an RC element in the form of a capacitor (7) which is connected in series with an ohmic resistor (16), in which case a diode (8) is connected in parallel with the resistor (16) of the RC element, by way of which diode (8) the capacitor (7) can be discharged by way of the coil (16) of the second contactor relay.
- Contactor safety combination according to claim 1, characterised in that the measures, by which in the case of actuation of the contactor relays the second contactor relay always attracts before the first, involve dimensioning the resistors of the two coils (a,b) differently.
- Contactor safety combination according to claim 1 or 2, characterised in that a first light-emitting diode (9) is connected in parallel with the coil (a) of the first contactor relay.
- Contactor safety combination according to one of the preceding claims, characterised in that a second light-emitting diode (10) is additionally connected in parallel with the control voltage terminal (1,2) of the contactor safety combination.
- Contactor safety combination according to one of the preceding claims, characterised in that the ON-button is connected in a self-monitoring manner.
- Contactor safety combination according to one of the preceding claims, characterised in that the EMERGENCY-OFF contacts are contacts (3,4) which are dependent upon the position of a protective door.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4413676 | 1994-04-20 | ||
| DE4413676A DE4413676C1 (en) | 1994-04-20 | 1994-04-20 | Contactor safety combination |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0678889A1 EP0678889A1 (en) | 1995-10-25 |
| EP0678889B1 true EP0678889B1 (en) | 1997-10-01 |
Family
ID=6515933
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP95105460A Expired - Lifetime EP0678889B1 (en) | 1994-04-20 | 1995-04-11 | Contactor safety combination |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP0678889B1 (en) |
| DE (2) | DE4413676C1 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4441171C1 (en) * | 1994-11-18 | 1996-02-08 | Siemens Ag | Combined protection and safety circuit for electrical drive |
| DE19500396C1 (en) * | 1995-01-09 | 1996-02-01 | Siemens Ag | Safety control circuit for opening or clearing of drives |
| DE19616905C1 (en) * | 1996-04-17 | 1997-08-21 | Schleicher Relais | Dual-channel machinery operatives protection safety circuit for emergency cut=out function |
| CN107046758B (en) * | 2017-03-16 | 2023-06-27 | 上海鑫燕隆汽车装备制造有限公司 | Lighting lamp control box for automobile welding production line |
| CN113872259B (en) * | 2020-06-30 | 2024-06-18 | 比亚迪股份有限公司 | Contactor, direct current charging distribution box and vehicle |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3830742A1 (en) * | 1988-09-09 | 1990-03-22 | Elan Schaltelemente Gmbh | Safety circuit |
| 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 |
-
1994
- 1994-04-20 DE DE4413676A patent/DE4413676C1/en not_active Expired - Fee Related
-
1995
- 1995-04-11 DE DE59500734T patent/DE59500734D1/en not_active Expired - Fee Related
- 1995-04-11 EP EP95105460A patent/EP0678889B1/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| DE59500734D1 (en) | 1997-11-06 |
| DE4413676C1 (en) | 1995-09-21 |
| EP0678889A1 (en) | 1995-10-25 |
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