WO1996016422A1 - Protective safety combination - Google Patents

Protective safety combination Download PDF

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Publication number
WO1996016422A1
WO1996016422A1 PCT/DE1995/001539 DE9501539W WO9616422A1 WO 1996016422 A1 WO1996016422 A1 WO 1996016422A1 DE 9501539 W DE9501539 W DE 9501539W WO 9616422 A1 WO9616422 A1 WO 9616422A1
Authority
WO
WIPO (PCT)
Prior art keywords
contactor
auxiliary
contact
coil
auxiliary contactor
Prior art date
Application number
PCT/DE1995/001539
Other languages
German (de)
French (fr)
Inventor
Ralph-Ronald GÖBEL
Original Assignee
Siemens Aktiengesellschaft
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Siemens Aktiengesellschaft filed Critical Siemens Aktiengesellschaft
Priority to DE59502282T priority Critical patent/DE59502282D1/en
Priority to JP8516432A priority patent/JPH10508977A/en
Priority to EP95935853A priority patent/EP0792512B1/en
Publication of WO1996016422A1 publication Critical patent/WO1996016422A1/en

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Classifications

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

Definitions

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

Abstract

In the protective safety combination according to the invention, two safety or emergency shutdown contacts (Kb1, Ka2 or Ka1, Kb2) are connected upstream or downstream of the coils (a, b) of two auxiliary contactors. A capacitor (7) lying in parallel with the second auxiliary contactor b (in place of the third auxiliary contactor normally required) ensures by virtue of its memory function that the circuit functions in a self-monitoring way even when transient errors arise.

Description

Beschreibung description
SchützsicherheitskombinationContactor safety combination
Die Erfindung bezieht sich auf eine Schützsicherheitskombina¬ tion 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 Hilfs¬ schützes ein erster 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 at least one of the coils of two auxiliary contactors, the coil of the first auxiliary contactor being an NC contact of the second auxiliary contactor and the coil of the second auxiliary contactor, a first break contact of the first auxiliary contactor is connected in series.
Schützsicherheitskombinationen der obengenannten Art sind aus DE-OS 39 33 699 bekannt. Hier ist zum Öffnerkontakt des zwei¬ ten Hilfsschützes ein Öffnerkontakt eines dritten Hilfsschüt¬ zes in Reihe geschaltet. Zum Öffnerkontakt des ersten Hilfs¬ schützes liegt ein Schließerkontakt des ersten Hilfsschützes und ein Schließerkontakt des dritten Hilfsschützes in Reihe. Die Spule des dritten Hilfsschützes ist mit einer Parallel¬ schaltung 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 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 circuit comprising a further normally open contact of the first auxiliary contactor and a further normally open contact of the third auxiliary contactor.
Bei Anlegung einer Spannung an diese Schützsicherheitskombi¬ nation zieht das erste Hilfsschütz an und damit schließt auch der in Reihe zur Spule des zweiten Hilfsschützes liegende Schl eßerkontakt. 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 drit¬ ten 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 An¬ trieb freigegeben. Durch die Schaltung sind bereits vier Schaltglieder pro Hilfsschütz belegt. Mit drei beispielsweise achtpoligen Hilfsschützen lassen sich somit vier Freigabe¬ kreise 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. A drive is only enabled if all three auxiliary contactors are functional. The circuit already has four Switching elements per auxiliary contactor occupied. With three, for example, eight-pole auxiliary contactors, four release circuits can thus be implemented.
Bei einer demgegenüber verbesserten Schützsicherheitskombina¬ tion gemäß der nicht vorveröffentlichten deutschen Patentan¬ meldung P 43 37 665.7 werden die Schaltglieder der Hilfs¬ schütze effizienter ausgenützt, was die Realisierung zumin¬ dest 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 Unter- schied zu bekannten Schützsicherheitskombination gemäß DE-OS 39 33 699 ist hier den parallel geschalteten Spulen des zwei¬ ten und dritten Hilfsschützes eine Reihenschaltung aus Schließerkontakten des zweiten und dritten Hilfsschützes vor¬ geschaltet. Weiterhin liegt parallel zu dieser Reihenschal- tung ein Schließerkontakt des ersten Hilfsschützes in Reihe mit einem Schließerkontaktes eines EIN-Tasters.In an improved contactor safety combination in accordance with the unpublished German patent application P 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 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 Schützsicher¬ heitskombination der obengenannten Art zu schaffen, die die Reihenschaltung einer Schutztür- und NOT-AUS-Schaltung mit möglichst geringem Aufwand ermöglicht. Die Aufgabe wird da¬ durch gelöst, daß die Spule des ersten Hilfsschützes einen nachgeschalteten zweiten mit dem ersten gekoppelten Sicher¬ heits- oder NOT-AUS-Kontakt aufweist, daß der Spule des zwei- ten Hilfsschützes ein Öffnerkontakt eines EIN-Tasters in Rei¬ he geschaltet ist, daß dem Öffnerkontakt des zweiten Hilfs¬ schützes 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 Energiespei- eher in Wirkverbindung mit der Spule des zweiten Hilfsschüt¬ zes steht, der nach Spannungszuschaltungen die Schützsicher¬ heitskombination und einer anschließenden Betätigung des EIN- Tasters das zweite Hilfsschütz erregt und in den Zustand der Selbsthaltung überführt.The object of the invention is to create a contactor safety combination of the type mentioned above, which enables the series connection of a protective door and EMERGENCY STOP circuit with as little effort as possible. The object is achieved in that the coil of the first auxiliary contactor has a downstream second contact with the first coupled safety or EMERGENCY STOP contact, that the coil of the second auxiliary contactor has a break contact of an ON button in series is switched that the normally closed contact of the second auxiliary contactor is connected in parallel with a normally open contact of the auxiliary contactor, that the normally closed contact of the first auxiliary contactor is connected in parallel with a normally open contact, that means are provided by which the second auxiliary contactor always picks up before the first when the auxiliary contactors are actuated and that an energy supply is rather in operative connection with the coil of the second auxiliary contactor, which excites the contactor safety combination after voltage connections and a subsequent actuation of the ON button, and converts the second auxiliary contactor into the state of self-holding.
Die Schützsicherheitskombination gemäß Patentanspruch 1 weist folgende Vorteile auf:The contactor safety combination according to claim 1 has the following advantages:
1. Mit nur zwei vierpoligen Hilfsschützen lassen sich ein Freigabekreis mit zwei Schließerkontakten in Reihe und ein Meldekreis mit einem Schließer- oder Öffnerkontakt verwirklichen.1. With just two four-pole auxiliary contactors, an enabling circuit with two normally open contacts in series and a signaling circuit with a normally open or normally closed contact can be implemented.
2. Durch die Ausbildung des NOT-AUS-Schalters mit zwei Öff¬ nerkontakten in der beschriebenen Weise wird eine Zwei- kanaligkeit erreicht, d.h. mit jedem der beiden Öffner¬ kontakte kann der Freigabekreis ausgeschaltet werden.2. By designing the EMERGENCY STOP switch with two break contacts in the manner described, a two-channel system is achieved, i.e. the release circuit can be switched off with each of the two NC contacts.
3. Die Sicherheitskombination gewährt auch Sicherheit bei einem Querschluß, durch den z.B. die Reihenschaltung aus dem Öffnerkontakt des NOT-AUS-Tasters und dem Öffner¬ kontakt des EIN-Tasters kurzgeschlossen ist.3. The safety combination also guarantees safety in the event of a short circuit, through which e.g. the series connection of the break contact of the EMERGENCY STOP button and the break contact of the ON button is short-circuited.
4. Es erfolgt eine Selbstüberwachung des EIN-Tasters, d.h. bei Kurzschluß des Öffnerkontakts vom EIN-Taster ist die Schaltung nicht mehr funktionsf hig.4. The ON button is self-monitored, i.e. If the NC contact of the ON button is short-circuited, the circuit is no longer functional.
5. Die Schützsicherheitskombination ermöglicht die Realisie- rung einer Schutztür- und NOT-AUS-Schaltung mit nur zwei Schützen.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 selbstüberwa¬ chend. 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 in the event of volatile errors. It therefore corresponds to the safety standard of previously known circuits of this type. Self-monitoring is advantageously carried out by using a capacitor Energy storage reached, which takes over the memory function of the usually third contactor.
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:Exemplary embodiments of the invention are explained in more detail below with reference to a drawing. Show it:
FIG 1 Eine erfindungsgemäße Schützsicherheitskombination als zweikanalige NOT-AUS-Schaltung zum Gleichspannungs- anschluß, FIG 2 eine erfindungsgemäße zweikanalige Schutztürschaltung zum Gleichspannungsanschluß und FIG 3 eine zweikanalige NOT-AUS-Schaltung zum Wechselspan¬ nungsanschluß.1 shows a contactor safety combination according to the invention as a two-channel EMERGENCY STOP circuit for DC voltage connection, FIG. 2 shows a two-channel protective door circuit according to the invention for DC voltage connection, and FIG. 3 shows a two-channel EMERGENCY STOP circuit for AC voltage connection.
FIG 1 zeigt eine zweikanalige NOT-AUS-Schaltung mit einem durch einen Pluspol 1 und einen Minuspol 2 gebildeten Gleich- spannungsanschluß. Die NOT-AUS-Schaltung besteht im wesentli¬ chen 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 zwei- ten Hilfsschützes. Beiden Spulen a und b ist jeweils eine Parallelschaltung aus einem Schließer- und einem Öffnerkon¬ takt vorgeschaltet. Der erste Strompfad ist in der genannten Reihenfolge durch die Reihenschaltung der erwähnten Parallel¬ schaltung, die Spule b und den Öffnerkontakt 5 gebildet, der direkt mit dem Minuspol 2 verbunden ist. Die der Spule a vor¬ geschaltete Parallelschaltung besteht aus einem Schließerkon¬ takt Ka2 des ersten Hilfsschützes und einem Öffnerkontakt K^ des zweiten Hilfsschützes. Die der Spule b vorgeschaltete Parallelschaltung besteht aus einem Öffnerkontakt Kaχ des ersten Hilfsschützes und einem Schließerkontakt Kj-,2 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. A coil a of a first auxiliary contactor lies in the first current path, a coil b of a second auxiliary contactor lies in the second current path. Both coils a and b are preceded by a parallel connection consisting of a normally open and an normally closed contact. The first current path is formed in the order mentioned by the series connection of the parallel connection mentioned, the coil b and the break contact 5, which is connected directly to the negative pole 2. The parallel connection upstream of the coil a consists of a normally open contact K a 2 of the first auxiliary contactor and an normally closed contact K ^ of the second auxiliary contactor. The parallel connection upstream of the coil b consists of an NC contact K a χ of the first auxiliary contactor and a NO contact Kj-, 2 of the second auxiliary contactor.
Ober 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.Above the break contact 3 of the EMERGENCY STOP switch, the second current path, which is formed by the series connection of the second parallel connection mentioned, the coil b, an OFF button 5 and the break contact 4 in the order mentioned, is parallel to the first current path.
Die parallelen Strompfade sind über eine Sicherung 11 und eine dazu in Reihe liegende Diode 12 mit dem Pluspol 1 ver¬ bunden. Zwischen dem Verbindungspunkt der letztgenannten bei¬ den Schaltungskomponenten und dem Minuspol 2 liegt ein ohm- scher Widerstand 13, der zusammen mit der Diode 12 eine Rei¬ henschaltung bildet, die durch eine Leuchtdiode 10 und einen weiteren ohmschen Widerstand 14 überbrückt ist.The parallel current paths are connected to the positive pole 1 via a fuse 11 and a diode 12 in series therewith. Between the connection point of the latter two circuit components and the negative pole 2 there is an ohmic resistor 13 which, together with the diode 12, forms a series circuit which is bridged by a light-emitting diode 10 and a further ohmic resistor 14.
Zur Spule a des ersten Hilfsschützes liegt eine Reihenschal- tung 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 a 3 of the first auxiliary contactor, an ohmic resistor 16 and a capacitor 7 in the order mentioned, the cathode of the capacitor 7 being connected to the negative pole 2 is switched. The series connection of the resistor 16 and the break contact K a 3 is bridged by a Zener diode 8, via which the capacitor 7 can be discharged.
Zur Wirkungsweise der beschriebenen Schützsicherheitskombina¬ tion ist folgendes auszuführen: Bei Anlegen einer Gleichspan¬ nung an die beiden Pole 1,2 und geschlossenem NOT-AUS-Schal- ter, 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 Dirnen- sionierung der Spulenwiderstände beider Spulen a,b wird er¬ reicht, daß stets das zweite Hilfsschütz als erstes anzieht, selbst wenn beide Hilfsschütze über den NOT-AUS-Schalter gleichzeitig betätigt werden. Sobald der Öffnerkontakt K^i 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, ie the unlocked break contacts 3, 4 are not operated, the current path for both coils is , b closed, and both auxiliary contactors therefore pick up. Through different prostitutes The coil resistances of both coils a, b are achieved so 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 ^ i 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 Öff¬ nerkontakte Kaι 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 still closed open contacts K a ι and K a 3 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 Schützes 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.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.
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 Kondensa- tors 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 angedeu¬ tet. Die vorliegende NOT-AUS-Schaltung hat den Vorteil, daß selbst bei einem Verschweißen von Schließerkontakten des ersten Hilfsschützes und anschließendem Entriegeln der NOT-AUS-Öff- nerkontakte 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 Ausschaltver¬ zögerung 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 gewährlei¬ stet.If the ON button is released, ie the NC contact 5 is closed again, the first auxiliary contactor remains in the ON position due to the self-holding contact K a 2 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 as well as a signaling circuit with one NO contact can be implemented, as indicated in the right part of FIG. 1. The present EMERGENCY STOP circuit has the advantage that even when the normally open contacts of the first auxiliary contactor are welded and the EMERGENCY STOP opener contacts 3, 4 are then unlocked, the second auxiliary contactor no longer picks up since the capacitor 7 is already discharged. Moving the EMERGENCY STOP contacts 3, 4 from the position in front of the contactor coil behind it or vice versa would prevent automatic start-up, but would result in a switch-off delay for the second contactor in the millisecond range. In the event of a fault, ie when the normally open contacts of the first auxiliary contactor are welded, an immediate response of the circuit would no longer be guaranteed.
Die Spannungsanschaltung an den Anschlüssen 1,2 wird auf ein¬ fache 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 light-emitting diode 10. The LED 9 makes the excitation of the first auxiliary contactor visible.
In FIG 2 ist die Ausführung einer erfindungsgemäßen zweikana- ligen 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.FIG. 2 shows the design of a two-channel protective door circuit according to the invention. It differs from the EMERGENCY STOP circuit according to FIG. 1 only in that the break contacts 3, 4 are now switched as a function of the position of a protective door. The two switching elements 3, 4 are also opened in the open state in accordance with the position of the protective door shown.
FIG 3 zeigt eine zweikanalige NOT-AUS-Schaltung für Wechsel¬ spannungsanschluß 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 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.

Claims

Patentansprüche claims
1. Schützsicherheitskombination mit Hilfsschützen zur Frei¬ gabe eines Antriebs, bei dem ein erster Sicherheits- oder NOT-AUS-Kontakt (3) mindestens einer der Spulen (a,b) zweier Hilfsschütze vor- bzw. nachgeschaltet ist, wobei der Spule (a) des ersten Hilfsschützes ein Öffnerkontakt (Kbl) des zweiten Hilfsschützes und der Spule (b) des zweiten Hilfs- scützes ein erster Öffnerkontakt (Kai) des ersten Hilfs- schützes in Reihe geschaltet ist, d a d u r c h g e ¬ k e n n z e i c h n e t , daß die Spule (a) des ersten Hilfsschützes einen nachgeschalteten zweiten (4) mit dem ersten (3) gekoppelten Sicherheits- oder NOT-AUS-Kontakt aufweist, daß der Spule (b) des zweiten Hilfsschützes ein Öffnerkontakt (5) eines EIN-Tasters in Reihe geschaltet ist, daß dem Öffnerkontakt (Kbl) des zweiten Hilfsschützes ein Schließerkontakt (Ka2) des ersten Hilfsschützes parallel liegt, daß dem Öffnerkontakt (Kai) des ersten Hilfsschützes ein Schließerkontakt (Kb2) parallel liegt, daß Mittel vorge- sehen sind, durch die bei Betätigung der Hilfsschütze stets das zweite Hilfsschütz vor dem ersten anzieht, daß ein Ener¬ giespeicher (7) in Wirkverbindung mit der Spule (4) 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 Selbsthe.ltung überführt.1. Contactor safety combination with auxiliary contactors for releasing a drive in which a first safety or EMERGENCY STOP contact (3) is connected upstream or downstream of at least one of the coils (a, b) of two auxiliary contactors, the coil (a ) of the first auxiliary contactor an NC contact (Kbl) of the second auxiliary contactor and the coil (b) of the second auxiliary contactor a first NC contact (Kai) of the first auxiliary contactor is connected in series, characterized ¬ indicates that the coil (a) of the the first auxiliary contactor has a downstream second (4) with the first (3) coupled safety or EMERGENCY STOP contact, that the coil (b) of the second auxiliary contactor has an NC contact (5) of an ON button connected in series that the Normally closed contact (Kbl) of the second auxiliary contactor has a normally open contact (Ka2) of the first auxiliary contactor that the normally closed contact (Kai) of the first auxiliary contactor has a normally open contact (Kb2) that is parallel Means are provided so that when the auxiliary contactors are actuated, the second auxiliary contactor always pulls in before the first, that an energy store (7) is operatively connected to the coil (4) of the second auxiliary contactor, which, after voltage connections, the contactor safety combination and a subsequent one Pressing the ON button energizes the second auxiliary contactor and changes it to the self-holding state.
2. Schützsicherheitskombination nach Anspruch 1, d a d u r c h g e k e n n z e i c h n e t , daß der Energiespeicher als Kondensator (7) ausgeführt ist.2. Contactor safety combination according to claim 1, d a d u r c h g e k e n n z e i c h n e t that the energy storage is designed as a capacitor (7).
3. Schützsicherheitskombination nach Anspruch 1 oder 2, d a d u r c h g e k e n n z e i c h n e t , daß der Reihenschaltung aus der Spule (6) des zweiten Hilfsschützes und dem Öffnerkontakt (5) des EIN-Tasters eine Reihenschal¬ tung aus einem zweiten Öffnerkontakt (Ka ) des ersten Hilfs- Schutzes, einem ohmschen Widerstand (16) und dem Kondensator (7) parallel geschaltet ist.3. Contactor safety combination according to claim 1 or 2, characterized in that the series connection from the coil (6) of the second auxiliary contactor and the break contact (5) of the ON button a series circuit from a second break contact (K a ) of the first auxiliary Protection, an ohmic resistor (16) and the capacitor (7) is connected in parallel.
4. Schützsicherheitskombination nach einem der vorangehenden Ansprüche, d a d u r c h g e k e n n z e i c h n e t , daß zur Reihenschaltung aus dem Widerstand (16) und dem zwei¬ ten Öffnerkontakt (Ka3) eine Diode (8) parallel liegt, über die der Kondensator (7) über die Spule (6) des zweiten Hilfs¬ schützes entladbar ist.4. Contactor safety combination according to one of the preceding claims, characterized in that for the series connection of the resistor (16) and the second opening contact (K a 3), a diode (8) is connected in parallel, via which the capacitor (7) via the coil ( 6) of the second auxiliary contactor can be discharged.
5. Schützsicherheitskombination nach einem der vorangehenden Ansprüche, d a d u r c h g e k e n n z e i c h n e t , daß die Mittel, durch die bei Betätigung der Hilfsschütze stets das zweite Hilfsschütz vor dem ersten anzieht, darin bestehen, daß die Widerstände der beiden Spulen (a,b) unter¬ schiedlich dimensioniert sind.5. Contactor safety combination according to one of the preceding claims, d a d u r c h g e k e n n z e i c h n e t that the means by which the second contactor always picks up before the first when the auxiliary contactors are actuated are that the resistances of the two coils (a, b) are dimensioned differently.
6. Schützsicherheitskombination nach nach einem der voran¬ gehenden Ansprüche, d a d u r c h g e k e n n z e i c h - n e t , daß parallel zur Spule (a) des ersten Hilfsschützes eine erste Leuchtdiode (9) geschaltet ist.6. Contactor safety combination according to one of the preceding claims, d a d u r c h g e k e n n z e i c h - n e t that a first light-emitting diode (9) is connected in parallel with the coil (a) of the first auxiliary contactor.
7. Schützsicherheitskombination nach einem der vorangehenden Ansprüche, d a d u r c h g e k e n n z e i c h n e t , daß parallel zum Steuerspannungsanschluß (1,2) der Schütz- sicherheitskombination ein^ zweite Leuchtdiode (10) zuge¬ schaltet ist . r7. Contactor safety combination according to one of the preceding claims, d a d u r c h g e k e n n z e i c h n e t that a ^ second light-emitting diode (10) is switched in parallel to the control voltage connection (1, 2) of the contactor safety combination. r
8. Schützsicherheitskombination nach einem der vorangehenden Ansprüche, d a d u r c h g e k e n n z e i c h n e t , daß der EIN-Taster selbstüberwachend geschaltet ist.8. Contactor safety combination according to one of the preceding claims, d a d u r c h g e k e n n z e i c h n e t that the ON button is switched self-monitoring.
9. Schützsicherheitskombination nach einem der vorangehenden Ansprüche, d a d u r c h g e k e n n z e i c h n e t , daß die NOT-AUS-Kontakte von der Stellung einer Schutztür abhängige Kontakte (3,4) sind. 9. Contactor safety combination according to one of the preceding claims, d a d u r c h g e k e n n z e i c h n e t that the EMERGENCY STOP contacts are dependent on the position of a protective door contacts (3,4).
PCT/DE1995/001539 1994-11-18 1995-11-07 Protective safety combination WO1996016422A1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE59502282T DE59502282D1 (en) 1994-11-18 1995-11-07 PROTECTIVE SECURITY COMBINATION
JP8516432A JPH10508977A (en) 1994-11-18 1995-11-07 Protective safety combination device
EP95935853A EP0792512B1 (en) 1994-11-18 1995-11-07 Protective safety combination

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4441171A DE4441171C1 (en) 1994-11-18 1994-11-18 Combined protection and safety circuit for electrical drive
DEP4441171.5 1994-11-18

Publications (1)

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

Family

ID=6533624

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE1995/001539 WO1996016422A1 (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)

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* 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

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DE3541338A1 (en) * 1985-11-22 1987-05-27 Pepperl & Fuchs Circuit having self-monitoring
DE3937122A1 (en) * 1989-11-10 1991-05-16 Elan Schaltelemente Gmbh Fail=safe switching circuitry using relays - having closing contacts coupled in series in release current circuit
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

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DE3933699C2 (en) * 1989-10-09 1998-12-03 Siemens Ag Contactor safety combination

Patent Citations (4)

* 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
DE3937122A1 (en) * 1989-11-10 1991-05-16 Elan Schaltelemente Gmbh Fail=safe switching circuitry using relays - having closing contacts coupled in series in release current circuit
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
EP0792512A1 (en) 1997-09-03
DE4441171C1 (en) 1996-02-08
JPH10508977A (en) 1998-09-02
EP0792512B1 (en) 1998-05-20
DE59502282D1 (en) 1998-06-25

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