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EP0149727A1 - Supervisory circuit for the safety contacts of elevators - Google Patents

Supervisory circuit for the safety contacts of elevators Download PDF

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Publication number
EP0149727A1
EP0149727A1 EP84112557A EP84112557A EP0149727A1 EP 0149727 A1 EP0149727 A1 EP 0149727A1 EP 84112557 A EP84112557 A EP 84112557A EP 84112557 A EP84112557 A EP 84112557A EP 0149727 A1 EP0149727 A1 EP 0149727A1
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EP
European Patent Office
Prior art keywords
safety
circuit
supply voltage
contacts
control
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.)
Granted
Application number
EP84112557A
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German (de)
French (fr)
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EP0149727B1 (en
Inventor
Karl-Otto Dipl.-Ing. Schöllkopf
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Thyssen MAN Aufzuge GmbH
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Thyssen MAN Aufzuge GmbH
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Priority to AT84112557T priority Critical patent/ATE35471T1/en
Publication of EP0149727A1 publication Critical patent/EP0149727A1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
    • B66B13/00—Doors, gates, or other apparatus controlling access to, or exit from, cages or lift well landings
    • B66B13/22—Operation of door or gate contacts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
    • B66B5/00—Applications of checking, fault-correcting, or safety devices in elevators
    • B66B5/0006—Monitoring devices or performance analysers
    • B66B5/0018—Devices monitoring the operating condition of the elevator system
    • B66B5/0031—Devices monitoring the operating condition of the elevator system for safety reasons

Definitions

  • the invention relates to a monitoring circuit for safety contacts located in the safety circuit of at least one contactor of an elevator control, in particular door and bolt contacts, which are in series with the at least one contactor, in particular in series with two contactors connected in parallel, along a safety route between a first supply voltage connection and a second supply voltage connection are connected.
  • the invention is therefore based on the object of specifying a monitoring circuit for the safety contacts of a safety circuit of the type specified at the outset, which, with a comparatively simple construction, meets the requirements mentioned above.
  • this object is achieved by a monitoring circuit, which is characterized in that at least two of the safety contacts are assigned a monitoring circuit which generates an evaluable control signal which is characteristic of the state of the assigned safety switch, the connection of which to the side of the assigned safety contact which is remote from the first supply voltage connection is connected and the other connection is connected to the second supply voltage connection, and that the internal resistance of each of the control circuits is selected such that the worst case in the event of a line break. in the monitoring circuit due to the presence of the control circuits over the safety route current flowing on the at least one contactor only leads to a voltage drop that is significantly below the response threshold or dropout threshold for the contactor.
  • the basic idea of the invention is therefore to dimension each individual control circuit so that the resistance in each conceivable parallel branch running parallel to a section of the safety route, which contains at least two control circuits, is sufficiently high to prevent a contactor from pulling or does not fall off.
  • a major advantage of the monitoring circuit according to the invention is that the faulty safety contact can be detected quickly and reliably on the basis of the output signals of the assigned control circuit and that consequently the downtimes for the elevator in question can be significantly reduced.
  • each of the control circuits has a rectifier circuit on the input side, which rectifies the supply voltage normally present as an AC voltage and whose output signal is fed to an optocoupler, at the output of which there is a threshold value circuit, at the output of which the control signal is available.
  • the series connection of the safety contacts S1 to S4 is in turn connected to two RA and RS contactors connected in parallel.
  • the series connection of the safety contacts S1 to S4 with the parallel connection of the contactors RA, RS is between the two connections A and B of a supply voltage source or an operating voltage source, which is usually formed by a three-phase network, which is why the conductor connected to connection A is referred to as phase conductor L. is, while the conductor connected to the terminal B is referred to as the neutral conductor N, for the 1, an earth connection E is provided.
  • the contactors RA and RS which are assigned, for example, to the upward travel and the fast travel of an associated elevator, can only attract in the circuit according to FIG. 1 if all four safety contacts S1 to S4 are closed. On the other hand, the contactors must drop out as soon as one of the four safety contacts S1 to S4 responds. These conditions are not met for the switching state shown in FIG. 1 since the safety contact S3 is open.
  • the fact that the safety contact S3, which can be a door or a bolt contact, for example, is open, is to be recognized as a fault according to the invention, contact S3 also being identified as a non-closed contact.
  • control circuits K1 to K4 serve this purpose, one of which is assigned to one of the safety contacts S1 to S4.
  • the control circuits K1 to K4 each lie between the side of the associated safety contact S1 to S4 facing away from the connection A and the connection B or the neutral conductor N, one of which according to FIG. 1 for the second connections of the control circuits K1 to K4 Neutral conductor N branching line N 'is provided.
  • R i of the control circuits K1 to K4 must be sufficiently high to reliably prevent the contactors RA, RS from tightening in the event of an interruption U
  • FIG. 2 shows an equivalent circuit diagram of the circuit according to FIG. 1 for the case of an open safety contact and an interruption in the branch N '. 2 shows a resistance R between the two connections A and B, which is in series with the parallel connection of the contactors RA, RS, each of which is indicated by the series connection of an ohmic resistor R and an inductance L.
  • the effective voltage across the RA contactor for the worst-case scenario considered may only be 10% of the nominal voltage between connections A and B, since according to VDE regulation 0660 the contactors drop at 10% of the nominal voltage must be guaranteed, although the manufacturers often guarantee higher values, for example 15% of the nominal voltage.
  • Fig. 4 shows a schematic diagram of a in practice for an inventive.
  • Monitoring circuit used control circuit K .. It can be seen that the control circuit K i comprises a bridge circuit B, one bridge diagonal of which is connected via ohmic resistors R1, R2 to the lines L and N and whose output-side bridge diagonal with the input side (photodiode) one Optocoupler 0 is connected, the output side (phototransistor) is connected to a threshold circuit SW, the signal output SA signals whether the safety contact S i assigned to the control circuit K. is open or closed.
  • the photo transistor of the optocoupler O and the threshold circuit SW are fed with an auxiliary direct voltage + U, which can be obtained, for example, by means of a rectifier circuit (not shown) from the output voltage of an auxiliary transformer fed with the operating voltage.
  • the monitoring circuit described with rectifier bridge, optocoupler and threshold or trigger circuit offers the particular advantage of electrical isolation between the circuit input and output.

Landscapes

  • Maintenance And Inspection Apparatuses For Elevators (AREA)
  • Indicating And Signalling Devices For Elevators (AREA)

Abstract

1. Supervisory circuit for safety contacts (Si ) located in the safety circuit of at least one travelling contactor (RA, RS) of lift-control gear, in particular door and bolt contacts, which are connected in series with the at least one travelling contactor (RA, RS) along a safety section (A-B) between a first supply voltage terminal (A) and a second supply voltage terminal (B), each of the safety contacts (Si ) being associated with a control circuit (Ki ) producing an evaluatable control signal characteristic of the state of the associated safety switch, one terminal of the control circuit being connected to the side of the associated safety contact (Si ) remote from the first supply voltage terminal (A) and the other terminal of the control circuit being connected to the second supply voltage terminal (B), characterized in that the internal resistance (Ri ) of each of the control circuits (Ki ) is selected so that in the most unfavourable case, namely in the case of a disconnection (U) in the supervisory circuit and with the simultaneous of an open safety contact (Si ), in particular in the middle of the series connection, a current, which flows by way of the control circuits (Ki ) comprising only one finite internal resistance (Ri ) and the safety section (A-B), at the at least one travelling contactor (RA, RS) merely leads to a voltage drop, which clearly lies below the response threshold and the drop-out threshold for the travelling contactor (RA, RS).

Description

Die Erfindung betrifft eine Überwachungsschaltung für im Sicherheitskreis von mindestens einem Fahrschütz einer Aufzugsteuerung liegende Sicherheitskontakte, insbesondere Tür- und Riegelkontakte, die in Serie mit dem mindestens einen Fahrschütz, insbesondere in Serie mit zwei parallel zueinander geschalteten Fahrschützen, längs einer Sicherheitsstrecke zwischen einen ersten Speisespannungsanschluß und einen zweiten Speisespannungsanschluß geschaltet sind.The invention relates to a monitoring circuit for safety contacts located in the safety circuit of at least one contactor of an elevator control, in particular door and bolt contacts, which are in series with the at least one contactor, in particular in series with two contactors connected in parallel, along a safety route between a first supply voltage connection and a second supply voltage connection are connected.

Bei Aufzugsteuerungen ist es bekannt, in den Hauptstromkreis für je zwei parallel geschaltete Fahrschütze eine Anzahl von in Serie geschälteten Sicherheitskontakten, insbesondere Tür- und Riegelkontakten, zu legen. Hierdurch wird verhindert, daß die beiden Schütze, von denen das eine beispielsweise anzeigt, daß der Fahrkorb nach'unten fahren soll, und von denen das andere beispielsweise anzeigt, daß eine schnelle Fahrt erfolgen soll, betätigt werden können, solange einer der Sicherheitskontakte noch geöffnet ist, .so daß die Informationen fehlen, die für ein Anlaufen des Antriebsmotors für den Fahrkorb bzw. für-ein Einkuppeln desselben erforderlich sind, was bedeutet, daß der Fahrkorb aus. seiner jeweiligen Position nicht abfahren kann, ehe der betreffende Sicherheitsschalter nicht geschlossen ist.In elevator controls, it is known to place a number of safety contacts connected in series, in particular door and bolt contacts, in the main circuit for two contactors connected in parallel. This prevents the two contactors, one of which indicates, for example, that the car should go down, and the other of which, for example, indicates that fast travel is to take place, as long as one of the safety contacts is still open is so that the information is missing which is necessary for starting the drive motor for the car or for engaging the same, which means that the car is off. cannot move from its respective position until the relevant safety switch is not closed.

Es hat sich gezeigt, daß die an den Türen angebrachten Sicherheitskontakte, die für den Schutz der Aufzugbenutzer zwingend vorgeschrieben sind, zu den häufigsten Störquellen an Aufzugsanlagen.zählen, wobei die Fehlfunktion eines bestimmten Sicherheitsschalters jedoch von außen oft nur schwer zu erkennen ist, so - daß eine schnelle Beseitigung der Störung.erschwert wird. Damit verlängert sich aber auch.die Zeit, für die der Aufzug für die Benutzer nicht zur Verfügung steht.It has been shown that signs affixed to the doors S icherheitskontakte that are mandatory for the protection of the elevator users, the most common sources of interference to Aufzugsanlagen.zählen where the malfunction is however often difficult to identify a particular safety switch from the outside, - That a quick elimination of the fault is difficult. This also increases the time for which the elevator is not available to users.

Es wurde bereits versucht, ein schnelles Auffinden des jeweils gestörten Sicherheitskontaktes durch eine Uberwachungsschaltung mit jeweils einem zweiten Kontakt oder einem zusätzlichen Geber für jeden der Sicherheitskontakte zu ermöglichen. Diese Kontrolle der mechanischen Betätigung der Sicherheitsschalter ist jedoch nicht ausreichend, da hierdurch Rontaktstörungen am Sicherheitsschalter selbst nicht erfasst werden können.Attempts have already been made to enable the faulty safety contact to be found quickly by means of a monitoring circuit with a second contact in each case or an additional transmitter for each of the safety contacts. However, this control of the mechanical actuation of the safety switch is not sufficient, since it cannot detect rontact faults on the safety switch itself.

Außerdem.muß bei der Realisierung einer Uberwachungsschaltung für die Sicherheitskontakte von Aufzügen stets geprüft werden, inwieweit eine direkte Überwachung von Sicherheitskontakten zulässig bzw. technisch durchführbar ist. Insbesondere muß die Uberwachungs- bzw. Kontrollschaltung folgenden Kriterien genügen:

  • 1. Die Funktion des Sicherheitskontaktes im Sicherheitskreis muß auch im Fehlerfall der Uberwachungsschaltung gewährleistet sein;
  • 2. eine Uberbrückung des Sicherheitsschalters durch fehlerhafte Verdrahtung in der Steuerung oder im Schacht darf nicht möglich sein;
  • 3. die Dimensionierung der Überwachungsschaltung muß derart erfolgen, daß auch im ungünstigsten Falle eine einwandfreie Funktion gewährleistet ist;
  • 4. der technische Aufwand für die Überwachungsschaltung soll so gering wie möglich sein, da bei einer größeren Anzahl von Stockwerken., die von dem betreffenden Aufzug bedient wird, eine entsprechend hohe Zahl von Tür- und Riegelkontakten vorhanden ist.
In addition, when implementing a monitoring circuit for the safety contacts of elevators, it must always be checked to what extent direct monitoring of safety contacts is permissible or technically feasible. In particular, the monitoring or control circuit must meet the following criteria:
  • 1. The function of the safety contact in the safety circuit must also be guaranteed in the event of a fault in the monitoring circuit;
  • 2. It must not be possible to bypass the safety switch due to incorrect wiring in the control system or in the shaft;
  • 3. The dimensioning of the monitoring circuit must take place in such a way that proper functioning is guaranteed even in the worst case;
  • 4. The technical effort for the monitoring circuit should be as low as possible, since with a larger number of floors served by the elevator in question there is a correspondingly high number of door and bolt contacts.

Ausgehend vom Stand der Technik liegt der Erfindung somit die Aufgabe zugrunde, eine Überwachungsschaltung für die Sicherheitskontakte eines Sicherheitskreises der eingangs angegebenen Art anzugeben, welche bei vergleichsweise einfachem Aufbau den vorstehend aufgeführten Forderungen genügt.Starting from the prior art, the invention is therefore based on the object of specifying a monitoring circuit for the safety contacts of a safety circuit of the type specified at the outset, which, with a comparatively simple construction, meets the requirements mentioned above.

Diese Aufgabe wird.erfindungsgemäß durch eine überwachungsschaltung gelöst, welche dadurch gekennzeichnet ist, daß mindestens zweien der Sicherheitskontakte eine ein auswertbares, für den Zustand des zugeordneten Sicherheitsschalters charakteristisches Kontrollsignal erzeugende überwachungsschaltung zugeordnet ist, deren einer Anschluß mit der vom ersten Speisespannungsanschluß abgewandten Seite des zugeordneten Sicherheitskontaktes verbunden ist und deren anderer Anschluß mit dem.zweiten Speisespannungsanschluß verbunden ist, und daß der Innenwiderstand jeder der Kontrollschaltungen derart gewählt ist, daß der.im ungünstigsten Fall bei einer Leitungsunterbrechung. in..der Überwachungsschaltung wegen des Vorhandenseins der Kontrollschaltungen über die Sicherheitsstrecke fließende Strom an dem mindestens einen Fahrschütz lediglich zu einem Spannungsabfall führt, der deutlich unter der Ansprechschwelle bzw. Abfallschwelle für das Fahrschütz liegt.According to the invention, this object is achieved by a monitoring circuit, which is characterized in that at least two of the safety contacts are assigned a monitoring circuit which generates an evaluable control signal which is characteristic of the state of the assigned safety switch, the connection of which to the side of the assigned safety contact which is remote from the first supply voltage connection is connected and the other connection is connected to the second supply voltage connection, and that the internal resistance of each of the control circuits is selected such that the worst case in the event of a line break. in the monitoring circuit due to the presence of the control circuits over the safety route current flowing on the at least one contactor only leads to a voltage drop that is significantly below the response threshold or dropout threshold for the contactor.

Der Grundgedanke der Erfindung besteht also darin, jede einzelne Rontrollschaltung so zu dimensionieren, daß der Widerstand in jedem denkbaren, parallel zu einem Abschnitt der Sicherheitsstrecke verlaufende Parallelzweig, welcher mindestens zwei Kontrollschaltungen enthält, ausreichend hoch ist, um zu verhindern, daß ein Fahrschütz anzieht bzw. nicht abfällt.The basic idea of the invention is therefore to dimension each individual control circuit so that the resistance in each conceivable parallel branch running parallel to a section of the safety route, which contains at least two control circuits, is sufficiently high to prevent a contactor from pulling or does not fall off.

Ein wesentlicher Vorteil der überwachungsschaltung gemäß der Erfindung besteht darin, daß der jeweils gestörte Sicherheitskontakt.aufgrund der Ausgangssignale der zugeordneten Kontrollschaltung schnell und sicher erkannt werden kann und daß folglich die Ausfallzeiten für den betreffenden Aufzug deutlich verkürzt werden können.A major advantage of the monitoring circuit according to the invention is that the faulty safety contact can be detected quickly and reliably on the basis of the output signals of the assigned control circuit and that consequently the downtimes for the elevator in question can be significantly reduced.

Dabei hat es sich als vorteilhaft erwiesen, wenn jede der Kontrollschaltungen eingangsseitig eine Gleichrichterschaltung aufweist, welche die normalerweise als Wechselspannung vorliegende Speisespannung gleichrichtet und deren Ausgangssignal einem Optokoppler zugeführt wird, an dessen Ausgang eine Schwellwertschaltung liegt, an deren Ausgang das Kontrollsignal verfügbar ist.It has proven to be advantageous if each of the control circuits has a rectifier circuit on the input side, which rectifies the supply voltage normally present as an AC voltage and whose output signal is fed to an optocoupler, at the output of which there is a threshold value circuit, at the output of which the control signal is available.

Weitere Vorteile und Einzelheiten der Erfindung werden nachstehend anhand von Zeichnungen noch näher erläutert.Further advantages and details of the invention are explained in more detail below with reference to drawings.

Es zeigen: -

  • Fig. 1 ein Prinzipschaltbild des Sicherheitskreises einer Aufzugsteuerung mit einer erfindungs- gemäßen überwachungsschaltung;
  • Fig. 2 ein Ersatzschaltbild zur Erläuterung der Dimensionierung der erfindungsgemäß vorgesehenen Kontrollschaltungen;
  • Fig. 3 ein weiteres Prinzipschaltbild der erfindungsgemäßen überwachungsschaltung zur Erläuterung des ungünstigsten Falles einer Störung und
  • Fig. 4 ein schematisches Schaltbild einer bevorzugten Ausführungsform einer Kontrollschaltung der überwachungsschaltung gemäß der Erfindung.
Show it: -
  • FIG. 1 is a schematic circuit diagram of the safety circuit of an elevator controller having a fiction, - proper monitoring circuit;
  • 2 shows an equivalent circuit diagram to explain the dimensioning of the control circuits provided according to the invention;
  • 3 shows a further basic circuit diagram of the monitoring circuit according to the invention to explain the worst case of a fault and
  • 4 shows a schematic circuit diagram of a preferred embodiment of a control circuit of the monitoring circuit according to the invention.

Im einzelnen zeigt Fig. 1 eine Anzahl von Sicherheitskontakten S1' bis S4, die in Reihe geschaltet sind. Die Serienschaltung der Sicherheitskontakte S1 bis S4 liegt ihrerseits in Serie zu zwei zueinander parallel geschalteten Fahrschützen RA und RS. Die Serienschaltung der Sicherheitskontakte S1 bis S4 mit der Parallelschaltung der Fahrschütze RA, RS liegt zwischen den beiden Anschlüssen A und B einer Speisespannungsquelle bzw. einer Betriebsspannungsquelle, die üblicherweise durch ein Drehstromnetz gebildet wird, weshalb der mit dem Anschluß A verbundene Leiter als Phasenleiter L bezeichnet ist, während der mit dem Anschluß B verbundene Leiter als Null-Leiter N bezeichnet ist, für den gemäß Fig. 1 ein Erdungsanschluß E vorgesehen ist. Die Fahrschütze RA und RS, die beispielsweise der Aufwärtsfahrt und der schnellen Fahrt eines zugehörigen Aufzugs zugeordnet sind, können in der Schaltung gemäß Fig. 1 nur dann anziehen, wenn alle vier Sicherheitskontakte S1 bis S4 geschlossen sind. Andererseits müssen die Schütze abfallen, sobald einer der vier Sicherheitskontakte S1 bis S4 anspricht. Diese Bedingungen sind für den in Fig. 1 gezeigten Schaltzustand nicht erfüllt, da der Sicherheitskontakt S3 geöffnet ist. Die Tatsache, daß der Sicherheitskontakt S3, der beispielsweise ein Tür- oder ein Riegelkontakt sein kann, geöffnet ist, soll gemäß der Erfindung als Störung erkannt werden, wobei gleichzeitig auch der Kontakt S3 als nicht-geschlossener Kontakt identifiziert werden soll. Diesem Ziel dienen erfindungsgemäß vier Kontrollschaltungen K1 bis K4 , von denen jeweils eine jeweils einem der Sicherheitskontakte S1 bis S4 zugeordnet ist. Die Kontrollschaltungen K1 bis K4 liegen jeweils zwischen der von dem Anschluß A abgewandten Seite des zugeordneten Sicherheitskontaktes S1 bis S4 und dem Anschluß B bzw- dem Null-Leiter N, wobei gemäß Fig. 1 für die zweiten Anschlüsse der Kontrollschaltungen K1 bis K4 eine von dem Null-Leiter N abzweigende Leitung N' vorgesehen ist.1 shows a number of safety contacts S1 'to S4 which are connected in series. The series connection of the safety contacts S1 to S4 is in turn connected to two RA and RS contactors connected in parallel. The series connection of the safety contacts S1 to S4 with the parallel connection of the contactors RA, RS is between the two connections A and B of a supply voltage source or an operating voltage source, which is usually formed by a three-phase network, which is why the conductor connected to connection A is referred to as phase conductor L. is, while the conductor connected to the terminal B is referred to as the neutral conductor N, for the 1, an earth connection E is provided. The contactors RA and RS, which are assigned, for example, to the upward travel and the fast travel of an associated elevator, can only attract in the circuit according to FIG. 1 if all four safety contacts S1 to S4 are closed. On the other hand, the contactors must drop out as soon as one of the four safety contacts S1 to S4 responds. These conditions are not met for the switching state shown in FIG. 1 since the safety contact S3 is open. The fact that the safety contact S3, which can be a door or a bolt contact, for example, is open, is to be recognized as a fault according to the invention, contact S3 also being identified as a non-closed contact. According to the invention, four control circuits K1 to K4 serve this purpose, one of which is assigned to one of the safety contacts S1 to S4. The control circuits K1 to K4 each lie between the side of the associated safety contact S1 to S4 facing away from the connection A and the connection B or the neutral conductor N, one of which according to FIG. 1 for the second connections of the control circuits K1 to K4 Neutral conductor N branching line N 'is provided.

Bei der Schaltung gemäß Fig. 1 können sich bei einer Unterbrechung U der Abzweigung N' auf dem Teilstück zwischen den zweiten Anschlüssen der Kontrollschaltungen K1 und K2 (sowie bei einer Unterbrechung zwischen dem Erdungsanschluß E und dem zweiten Anschluß der ersten Kontrollschaltung K1 beim öffnen der Sicherheitskontaktes S3 dann Fehler ergeben, wenn über den in diesem Fall zur Verfügung stehenden Parallelzweig zur Sicherheitsstrecke ein Strom fließen könnte, der zu einem Ansprechen bzw. Nicht-Abfallen der Fahrschütze RA, RS führen könnte. Aus diesem Grunde müssen die Innenwiderstände1, there may be an interruption U of the branch N 'on the section between the second connections of the control circuits K1 and K2 (and an interruption between the ground connection E and the second connection errors of the first control circuit K1 when the safety contact S3 is opened, if a current could flow via the parallel branch available in this case to the safety route, which current could lead to a response or non-dropout of the contactors RA, RS. For this reason, the internal resistances

Ri der Kontrollschaltungen K1 bis K4 ausreichend hoch sein, um bei einer Unterbrechung U ein Anziehen der Fahrschütze RA, RS mit Sicherheit zu verhindern.R i of the control circuits K1 to K4 must be sufficiently high to reliably prevent the contactors RA, RS from tightening in the event of an interruption U

Fig. 2 zeigt ein Ersatzschaltbild der Schaltung gemäß Fig. 1 für den Fall eines offenen Sicherheitskontaktes und einer Unterbrechung in der Abzweigung N'. Im einzelnen zeigt Fig. 2 zwischen den beiden Anschlüssen A und B einen Widerstand R , der in Serie zu der Parallelschaltung der Fahrschütze RA, RS liegt, die jeweils durch die Serienschaltung eines Ohm'schen Widerstandes R und einer Induktivität L angedeutet sind.FIG. 2 shows an equivalent circuit diagram of the circuit according to FIG. 1 for the case of an open safety contact and an interruption in the branch N '. 2 shows a resistance R between the two connections A and B, which is in series with the parallel connection of the contactors RA, RS, each of which is indicated by the series connection of an ohmic resistor R and an inductance L.

Aus Fig. 3 der Zeichnung, wo anstelle der Parallelschaltung zweier Fahrschütze nur ein einziges Fahrschütz RA eingezeichnet ist, wird deutlich, daß für den allgemeinen Fall von n Sicherheitskontakten in der Sicherheitsstrecke und von n zugeordneten Kontrollschaltungen, die jeweils einen Innenwiderstand Ri aufweisen, für den ungünstigsten Fall, nämlich bei einer Unterbrechung der Abzweigung N' zwischen dem Erdungsanschluß E und.der ersten Kontrollschaltung K1 und bei einem offenen Sicherheitskontakt in der Mitte der Serienschaltung von Sicherheitskontakten für den Vorwiderstand folgender Wert erhalten wird:

Figure imgb0001
Für diesen Extremfall muß der Vorwiderstand R immer v noch hoch genug sein, um ein Anziehen der Fahrschütze bzw. - dies ist als Zusatzbedingung zu beachten - auch nur des einzigen in Fig. 3 gezeigten Fahrschützes RA zu verhindern bzw. das Abfallen zu gewährleisten. In der Praxis bedeutet dies, daß die effektive Spannung über dem Fahrschütz RA für den betrachteten, ungünstigsten Fall nur 1O % der Nennspannung zwischen den Anschlüssen A und B betragen darf, da gemäß der VDE-Vorschrift 0660 der Abfall der Schütze bei 10% der Nennspannung gewährleistet sein muß, wobei von den Herstellerfirmen jedoch häufig höhere Werte von beispielsweise 15% der Nennspannung garantiert werden.From Fig. 3 of the drawing, where only a single contactor RA is shown instead of the parallel connection of two contactors, it is clear that for the general case of n safety contacts in the safety route and of n assigned control circuits, each having an internal resistance R i , for the worst case, namely in the event of an interruption in the branching N 'between the ground connection E and the first control circuit K1 and with an open safety contact in the middle of the Series connection of safety contacts for the series resistor the following value is obtained:
Figure imgb0001
 For this extreme case, the series resistor R must still be high enough to prevent the contactors from being tightened or - as an additional condition to be taken into account - even from the only contactor RA shown in FIG. 3 or to ensure that they fall off. In practice, this means that the effective voltage across the RA contactor for the worst-case scenario considered may only be 10% of the nominal voltage between connections A and B, since according to VDE regulation 0660 the contactors drop at 10% of the nominal voltage must be guaranteed, although the manufacturers often guarantee higher values, for example 15% of the nominal voltage.

Das erfindungsgemäße Konzept der Überwachung der einzelnen Sicherheitskontakte mit Hilfe von zugeordneten Kontrollschaltungen ist also unter Einhaltung aller Sicherheitsvorschriften dann zulässig, wenn gemäß den vorstehend erläuterten Überlegungen auch im ungünstigsten Fall eine entsprechende Höhe des Vorwiderstandes Rv bzw. des verbleibenden Widerstandswertes der Serienschaltung von Sicherheitskontakten mit den durch die zugeordneten Kontrollschaltungen gebildeten Parallelzweigen sichergestellt wird. In der Praxis lässt sich diese Forderung ohne besondere Schwierigkeiten realisieren.The concept according to the invention of monitoring the individual safety contacts with the aid of assigned control circuits is therefore permissible in compliance with all safety regulations if, according to the considerations explained above, even in the worst case, a corresponding level of the series resistor R v or the remaining resistance value of the series connection of safety contacts with the parallel formed by the associated control circuits branches is ensured. In practice, this requirement can be met without any particular difficulties.

Fig. 4 zeigt ein schematisches Schaltbild einer in der Praxis für eine erfindungsgemäße. Überwachungsschaltung eingesetzten Kontrollschaltung K.. Man erkennt, daß die Kontrollschaltung Ki eine Brückenschaltung B umfasst, deren eine Brückendiagonale über Ohm'sche Widerstände R1, R2 an die Leitungen L bzw. N angeschlossen ist und deren ausgangsseitige Brückendiagonale mit der Eingangsseite (Fotodiode) eines Optokopplers 0 verbunden ist, dessen Ausgangsseite (Fototransistor) mit einer Schwellwertschaltung SW verbunden ist, deren Signalausgang SA signalisiert, ob der der Kontrollschaltung K. zugeordnete Sicherheitskontakt Si geöffnet oder geschlossen ist. Dabei werden der Fototransistor des Optokopplers O und die Schwellwertschaltung SW mit einer Hilfs-Gleichspannung +U gespeist, die beispielsweise mittels einer (nicht dargestellten) Gleichrichterschaltung aus der Ausgangsspannung eines mit der Betriebsspannung gespeisten Hilfstransformators gewonnen werden kann. Die beschriebene überwachungsschaltung mit Gleichrichterbrücke, Optokoppler und Schwellwert- bzw. Triggerschaltung bietet den besonderen Vorteil der galvanischen Trennung zwischen Schaltungseingang und -ausgang.Fig. 4 shows a schematic diagram of a in practice for an inventive. Monitoring circuit used control circuit K .. It can be seen that the control circuit K i comprises a bridge circuit B, one bridge diagonal of which is connected via ohmic resistors R1, R2 to the lines L and N and whose output-side bridge diagonal with the input side (photodiode) one Optocoupler 0 is connected, the output side (phototransistor) is connected to a threshold circuit SW, the signal output SA signals whether the safety contact S i assigned to the control circuit K. is open or closed. The photo transistor of the optocoupler O and the threshold circuit SW are fed with an auxiliary direct voltage + U, which can be obtained, for example, by means of a rectifier circuit (not shown) from the output voltage of an auxiliary transformer fed with the operating voltage. The monitoring circuit described with rectifier bridge, optocoupler and threshold or trigger circuit offers the particular advantage of electrical isolation between the circuit input and output.

Aus der vorstehenden Beschreibung wird deutlich, daß die erfindungsgemäße Kontrollschaltung auch unter Worst- case-Bedingungen.(Widerstandstoleranz, Spannungstoleranzen, Kurzschluß an den Halbleitern) ordnungsgemäß arbeitet.From the foregoing description it is apparent that the control circuit of the invention (pannungstoleranzen resistance tolerance, S, short-circuit at the semiconductors) even under worst-case conditions. Working properly.

Ergänzend soll noch darauf hingewiesen werden, daß durch geeignete Dimensionierung der Kontrollschaltung bis zu fünfzig in Serie liegende Sicherheitskontakte überwacht werden können.In addition, it should be pointed out that up to fifty safety contacts in series can be monitored by suitable dimensioning of the control circuit.

Claims (2)

1. Uberwachungsschaltung für im Sicherheitskreis von mindestens einem Fahrschütz einer Aufzugsteuerung liegende Sicherheitskontakte, insbesondere Tür-und Riegelkontakte, die in Serie mit dem mindestens einen Fahrschütz, insbesondere in Serie mit zwei parallel zueinander geschalteten Fahrschützen, längs einer Sicherheitsstrecke zwischen einen ersten Speisespannungsanschluß und einen zweiten Speisespannungsanschluß geschaltet sind, dadurch gekennzeichnet, daß mindestens zweien der Sicherheitskontakte (S.) eine ein auswertbares, für den Zustand des zugeordneten Sicherheitsschalters charakteristisches Kontrollsignal erzeugende Kontrollschaltung (Ki) zugeordnet ist, deren einer Anschluß mit der vom ersten Speisespannungsanschluß (A) abgewandten Seite des zugeordneten Sicherheitskontaktes (Si) verbunden ist und deren anderer Anschluß mit dem zweiten Speisespannungsanschluß (B) verbunden ist, und daß der Innenwiderstand (Ri) jeder der Kontrollschaltungen (Ki) derart gewählt ist, daß der im ungünstigsten Fall bei einer Leitungsunterbrechung (U) in der Überwachungsschaltung wegen des Vorhandenseins der Kontrollschaltungen (K.) über die Sicherheitsstrecke (A-B) fließende Strom an dem mindestens einen Fahrschütz (RA, RS) lediglich zu einem Spannungsabfall führt, der deutlich unter der Ansprechschwelle und Abfallschwelle für das Fahrschütz (RA, RS) liegt.1.Monitoring circuit for safety contacts in the safety circuit of at least one contactor of an elevator control, in particular door and bolt contacts, which are in series with the at least one contactor, in particular in series with two contactors connected in parallel, along a safety route between a first supply voltage connection and a second Supply voltage connection are connected, characterized in that at least two of the safety contacts (S.) are assigned a control circuit (K i ) which generates an evaluable control signal which is characteristic of the state of the assigned safety switch and whose connection is connected to the side facing away from the first supply voltage connection (A) the associated safety contact (S i ) is connected and the other connection is connected to the second supply voltage connection (B), and that the internal resistance (R i ) of each of the control circuits (K i ) is selected such that d in the worst case, if there is a line interruption (U) in the monitoring circuit due to the presence of the control circuits (K.) over the Safety route (AB) current flowing at least at least one contactor (RA, RS) only leads to a voltage drop that is significantly below the response threshold and dropout threshold for the contactor (RA, RS). 2. überwachungsschaltung nach Anspruch 1, dadurch gekennzeichnet, daß jede der Kontrollschaltungen (Ki) eingangs.seitig eine Gleichrichterschaltung (B) aufweist, mit deren Hilfe eine Gleichrichtung der als Wechselspannung vorliegenden Speisespannung durchführbar ist und deren Ausgangssignal einem Optokoppler (O) zuführbar ist, an dessen Ausgang eine Schwellwertschaltung (SW) liegt, an deren Ausgang (SA) das.Kontrollsignal verfügbar ist.2. Monitoring circuit according to claim 1, characterized in that each of the control circuits (K i ) on the input side has a rectifier circuit (B), with the aid of which rectification of the supply voltage present as an AC voltage can be carried out and the output signal of which can be fed to an optocoupler (O) , at the output of which there is a threshold circuit (SW), at whose output (SA) the control signal is available.
EP84112557A 1983-11-30 1984-10-18 Supervisory circuit for the safety contacts of elevators Expired EP0149727B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84112557T ATE35471T1 (en) 1983-11-30 1984-10-18 MONITORING CIRCUIT FOR ELEVATOR SAFETY CONTACTS.

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DE19833343303 DE3343303A1 (en) 1983-11-30 1983-11-30 MONITORING CIRCUIT FOR THE SAFETY CONTACTS OF ELEVATOR
DE3343303 1983-11-30

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Cited By (11)

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Publication number Priority date Publication date Assignee Title
EP0508403A2 (en) * 1991-04-09 1992-10-14 Otis Elevator Company Low speed elevator car safety circuit
FR2777087A1 (en) * 1998-04-03 1999-10-08 Otis Elevator Co Device for determination of which lock is defective amongst number of locks around sliding doors of lift
WO2006106172A1 (en) * 2005-04-08 2006-10-12 Kone Corporation Elevator system
WO2006108433A1 (en) * 2005-04-11 2006-10-19 Otis Elevator Company Safety circuit for a passenger conveyor system
AT502582B1 (en) * 2005-09-20 2008-05-15 Tuev Oesterreich Tech Ueberwac MONITORING EQUIPMENT OF AN ELEVATOR
US7905330B2 (en) * 2007-03-01 2011-03-15 Kone Corporation Door control safety arrangement for transportation system
WO2011054674A1 (en) * 2009-10-26 2011-05-12 Inventio Ag Safety circuit in an elevator system
CN103809503A (en) * 2014-03-04 2014-05-21 北京七星华创电子股份有限公司 Safety door interlocking system of semiconductor equipment
WO2016177683A1 (en) * 2015-05-05 2016-11-10 Inventio Ag Lift monitoring unit having a galvanically decoupled signal transmission
CN107892244A (en) * 2016-10-04 2018-04-10 通力股份公司 Elevator brake controller
WO2022078137A1 (en) * 2020-10-16 2022-04-21 苏州汇川技术有限公司 Safety loop voltage regulating circuit

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DE19849238C1 (en) * 1998-10-26 2000-03-09 O & K Rolltreppen Gmbh Safety cut-out method for escalator or moving walkway has safety fault signals provided by safety chain combined with drive monitoring signals for operation of drive cut-out contacts
CN104816996A (en) * 2015-05-07 2015-08-05 广州永日电梯有限公司 Detecting method of short circuit of door lock loop of elevator landing door

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Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0508403A2 (en) * 1991-04-09 1992-10-14 Otis Elevator Company Low speed elevator car safety circuit
EP0508403A3 (en) * 1991-04-09 1993-06-16 Otis Elevator Company Low speed elevator car safety circuit
FR2777087A1 (en) * 1998-04-03 1999-10-08 Otis Elevator Co Device for determination of which lock is defective amongst number of locks around sliding doors of lift
US6193019B1 (en) 1998-04-03 2001-02-27 Otis Elevator Company Device for localization of a door breakdown
WO2006106172A1 (en) * 2005-04-08 2006-10-12 Kone Corporation Elevator system
US7503435B2 (en) 2005-04-08 2009-03-17 Kone Corporation Elevator safety circuit monitoring system and method
WO2006108433A1 (en) * 2005-04-11 2006-10-19 Otis Elevator Company Safety circuit for a passenger conveyor system
AT502582B1 (en) * 2005-09-20 2008-05-15 Tuev Oesterreich Tech Ueberwac MONITORING EQUIPMENT OF AN ELEVATOR
DE102006044631B4 (en) * 2005-09-20 2015-04-30 TÜV Österreich (Technischer Überwachungs-Verein Österreich Monitoring device of an elevator installation
US7905330B2 (en) * 2007-03-01 2011-03-15 Kone Corporation Door control safety arrangement for transportation system
CN102596780A (en) * 2009-10-26 2012-07-18 因温特奥股份公司 Safety circuit in an elevator system
CN102596780B (en) * 2009-10-26 2014-08-06 因温特奥股份公司 Safety circuit in an elevator system
WO2011054674A1 (en) * 2009-10-26 2011-05-12 Inventio Ag Safety circuit in an elevator system
US9061863B2 (en) 2009-10-26 2015-06-23 Inventio Ag Safety circuit in an elevator system
CN103809503A (en) * 2014-03-04 2014-05-21 北京七星华创电子股份有限公司 Safety door interlocking system of semiconductor equipment
WO2016177683A1 (en) * 2015-05-05 2016-11-10 Inventio Ag Lift monitoring unit having a galvanically decoupled signal transmission
CN107567424A (en) * 2015-05-05 2018-01-09 因温特奥股份公司 The elevator monitoring apparatus of signal Transmission Part with Current Decoupling
AU2016257307B2 (en) * 2015-05-05 2019-05-02 Inventio Ag Lift monitoring unit having a galvanically decoupled signal transmission
CN107567424B (en) * 2015-05-05 2019-09-24 因温特奥股份公司 The elevator monitoring apparatus of signal Transmission Part with Current Decoupling
CN107892244A (en) * 2016-10-04 2018-04-10 通力股份公司 Elevator brake controller
US10899579B2 (en) 2016-10-04 2021-01-26 Kone Corporation Elevator brake controller
WO2022078137A1 (en) * 2020-10-16 2022-04-21 苏州汇川技术有限公司 Safety loop voltage regulating circuit

Also Published As

Publication number Publication date
EP0149727B1 (en) 1988-06-29
DE3472481D1 (en) 1988-08-04
DE3343303A1 (en) 1985-08-08
ATE35471T1 (en) 1988-07-15

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