EP3390259B1 - Method for monitoring a safety circuit of a lift assembly and monitoring device for a safety circuit of a lift assembly - Google Patents

Method for monitoring a safety circuit of a lift assembly and monitoring device for a safety circuit of a lift assembly Download PDF

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Publication number
EP3390259B1
EP3390259B1 EP16820226.5A EP16820226A EP3390259B1 EP 3390259 B1 EP3390259 B1 EP 3390259B1 EP 16820226 A EP16820226 A EP 16820226A EP 3390259 B1 EP3390259 B1 EP 3390259B1
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EP
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Prior art keywords
supply voltage
limit value
monitoring
voltage
safety circuit
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EP16820226.5A
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German (de)
French (fr)
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EP3390259A1 (en
Inventor
Philipp Zimmerli
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Inventio AG
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Inventio AG
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    • 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
    • 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
    • B66B5/0025—Devices monitoring the operating condition of the elevator system for maintenance or repair

Definitions

  • the invention relates to a method for monitoring a safety circuit of an elevator system according to the preamble of claim 1 and a monitoring device for a safety circuit of an elevator system according to the preamble of claim 9.
  • the EP 1 090 870 B1 describes a method for monitoring a safety circuit and a monitoring device for a safety circuit of an elevator system.
  • the monitored safety circuit has a series connection of switches for monitoring devices used for the safety of elevator operation and a voltage source for supplying the series connection with a supply voltage.
  • a switching device in the form of a safety relay is connected, which generates signals for an elevator control depending on the switching state of the switches. If all contacts of the safety circuit are closed, the safety relay is activated.
  • the elevator control monitors the status of the safety relay and if the safety relay is activated, the elevator control releases, for example, an upcoming travel command.
  • the supply voltage is set so that the voltage across the safety relay is constant. Since the supply voltage that can be provided by the voltage source has an upper limit, the supply voltage is monitored and an error message is generated when an upper limit value of 55 V, for example, is reached. If the mentioned error message is present, the voltage source is switched off and the elevator system is thus put out of operation.
  • a supply voltage of the safety circuit is monitored to determine whether it exceeds an upper limit value of 55 V, for example.
  • the monitored safety circuit has a series connection of switches for monitoring devices serving for the safety of the elevator operation and a voltage source for supplying the series connection with the mentioned supply voltage.
  • a switching device is connected, for example in the form of a safety relay, which, depending on the switching state of the switches, generates at least one signal for elevator control.
  • the supply voltage is set so that the voltage across the switching device is constant. The setting is made in particular by regulating the voltage across the switching device with the supply voltage as the manipulated variable.
  • at least one further parameter of a course of the supply voltage is determined and evaluated.
  • the voltage drop across the series connection of the switches represents a measure of the total resistance of the series connection.
  • the total resistance results from the sum of the individual resistances of the switches connected in series.
  • the resistance of a switch for example a door contact switch, by means of which it can be checked whether a shaft or cabin door is closed, can increase if the switch becomes dirty over time or contacts corrode.
  • the total resistance mentioned can thus indicate that at least one of the switches connected in series can fail in the near future.
  • the upper limit of the supply voltage is limited, so that an increasing total resistance can only be compensated to a certain extent by increasing the supply voltage. When the supply voltage reaches the upper limit mentioned, the supply voltage is switched off, in particular, and the elevator system is thus deactivated.
  • the supply voltage mentioned is a measure of the total resistance of the series connection.
  • a further parameter is checked as to whether a change in the supply voltage exceeds a first change limit value within a first time period.
  • a gradient of the supply voltage is thus monitored.
  • the mentioned first period of time can be carried out, for example, as an hour, a day, a week or a month.
  • a short period of time for example of an hour or a day, in particular a short-term change in the resistance of a switch can be recognized and reacted to in a short time.
  • the change can be caused, for example, by a sudden penetration of dirt or moisture into a switch.
  • With a longer period of time longer-term changes in the total resistance, for example due to slowly progressing corrosion of contacts, can be recognized.
  • a further parameter is used to determine whether the supply voltage exceeds a first limit value, the first limit value being less than the upper limit value.
  • the first limit value can be between 30 V and 50 V, in particular 40 V, for example. This means that a countermeasure can be initiated very easily before the upper limit value is reached and the elevator system is deactivated.
  • a further parameter is used to determine whether the supply voltage exceeds a second limit value which is greater than the first limit value and less than the upper limit value.
  • the second limit value can be between 45 V and 50 V, in particular 50 V, for example.
  • the first and / or second limit value are determined as a function of an initial value of the supply voltage.
  • the limit values can thus be adapted particularly well to the actual conditions of the elevator system.
  • the first limit value can be, for example, 10 V and the second limit value, for example, 20 V greater than the initial value of the supply voltage.
  • the mentioned initial value corresponds to a supply voltage after initial commissioning or after maintenance of the elevator system. After initial commissioning or after maintenance of the elevator system, it can be assumed that all switches in the safety circuit have been checked and found to be in order. The supply voltage that then arises represents a good and safe reference or initial value. If the supply voltage and thus the total resistance of the switches in the safety circuit increase significantly compared to this initial value, a problem with one or more switches can be concluded with a high degree of probability.
  • a further parameter is checked as to whether a change in the supply voltage exceeds a second change limit value within a second time period. In this way, for example, short-term and longer-term changes can advantageously be monitored simultaneously.
  • an entry is made in a readable memory, in particular in an error memory or an error circuit.
  • the memory can be read out, for example, as part of maintenance.
  • the maintenance can, for example, be carried out by a maintenance technician on site.
  • the maintenance it is also possible for the maintenance to be carried out as a so-called remote maintenance, in which the fault memory can be accessed from outside via a defined interface, for example via a data line.
  • remote maintenance in which the fault memory can be accessed from outside via a defined interface, for example via a data line.
  • maintenance of the elevator system is requested as an evaluation of the at least one further parameter.
  • Maintenance can be requested, for example, via an interface to a central maintenance center via a data line.
  • the level of the supply voltage is considered to be a little high in this case, but not yet very critical. A check as part of the next maintenance is therefore considered sufficient.
  • If the supply voltage then additionally exceeds the second limit value it is considered quite likely that without countermeasures it will also reach the upper limit value in the near future and the elevator system will be deactivated. To avoid this, maintenance of the elevator system is requested when the second limit value is reached. A particularly high availability of the elevator system is thus achieved.
  • the reason for the request in particular the reaching of the second limit value by the supply voltage in the example described, can also be transmitted.
  • a monitoring device for a safety circuit of an elevator system having a series connection of switches for monitoring devices serving for the safety of the elevator operation and a voltage source for supplying the series connection with a supply voltage, and at least at the end of the series connection a switching device is connected which, depending on the switching state of the switches, generates at least one signal for elevator control.
  • the supply voltage is set so that the voltage across the switching device is kept constant.
  • the monitoring device is intended to monitor whether the supply voltage exceeds an upper limit value.
  • the monitoring device is also provided for determining and evaluating at least one further parameter of a course of the supply voltage.
  • Fig. 1 1 denotes a safety circuit which consists of a series connection 2 of switches or contacts 3, at least one switching device in the form of a safety relay 4, of a voltage source serving as supply 5 in the form of a voltage converter 10 and of a monitoring unit 6, whereby the signal of the safety relay 4 is fed to an elevator control 7.
  • the switches 3 are used to monitor devices serving for the safety of the elevator operation, for example switch 3 is designed as a so-called door contact switch, which is then closed when an associated car door 18 is closed.
  • 24 V DC (DC voltage) is present on an input line 8 and is supplied to a circuit breaker 9.
  • the circuit breaker 9 is connected on the output side to the input In of the DC-DC voltage converter 10, which increases the 24 V DC to, for example, 25 V to 50 V DC.
  • the output voltage of the DC-DC voltage converter 10 serves as the supply voltage for the series circuit 2 of the switches 3.
  • One end of the series circuit 2 of the contacts 3 is connected to the output Out of the voltage converter 10 via a measuring resistor 11, the other end of the series circuit 2 is connected to the safety relays 4 connected.
  • the second connection of each safety relay 4 is connected to a common conductor symbolized by a downward-pointing arrow.
  • the switching state of the safety relay 4 is transmitted to a relay contact 12, via which the elevator control 7 carries a signal voltage.
  • a protective diode 13 is connected via the safety relays 4 to voltage peaks.
  • the voltage to be regulated across the safety relay 4 is tapped at point P1 and fed to a network 14 consisting of passive elements, which is connected to the voltage converter 10. If all contacts 3 of the series circuit 2 are closed, the voltage across the safety relay 4 is kept constant, for example at 25 V DC. If the series circuit 2 is open, the output voltage of the voltage converter 10 is kept at, for example, 53 V DC by means of a limiter 15.
  • the monitoring unit 6 consists of an overvoltage detector 16, a monitoring device 17 for the supply voltage and an overcurrent detector 19.
  • the overvoltage detector 16 monitors the voltage across the safety relay 4 and generates an error message if the monitored voltage exceeds 28 V DC, for example.
  • the monitoring device 17 of the supply voltage is discussed in more detail below.
  • the overcurrent detector 19 monitors the current flowing in the series circuit 2 in the form of a voltage across the measuring resistor 11 and generates an error message if the monitored current exceeds 300 mA, for example.
  • the error messages from the detectors 16, 19 and the monitoring device 17 are fed to an error circuit 20 which, in the presence of certain error messages, opens the circuit breaker 9, which switches off the voltage at the input In of the DC-DC voltage converter 10.
  • the error circuit 20 stores the errors that have occurred in a readable memory 22, which can be read out, for example, by a maintenance center shown via a data line 23.
  • a button 21 is provided for manually resetting the error circuit 20. It is also possible that the fault circuit 20 is reset by the maintenance center via the data line 23. Maintenance of the elevator system can also be requested from the maintenance center via the data line 23.
  • Fig. 2 shows details of the network 14 and the limiter 15 for voltage regulation via the safety relay 4.
  • the output voltage of the voltage converter 10 is kept constant at, for example, 53 V DC by means of a Zener diode Z1.
  • a capacitor C1 increases the dynamic Behavior of the limiter 15. If all contacts 3 of the series circuit 2 are closed, the voltage at point P1 across the safety relay 4 is kept constant, for example at 25 V DC.
  • the voltage at point P1 is fed via a reverse current-preventing diode D1 to a voltage divider consisting of resistor R3 and resistor R2, the voltage divider point P2 being connected to limiter 15 and a limiter resistor R1, which on the other hand is connected to the "feedback" input of voltage converter 10 is.
  • the voltage converter 10 regulates the voltage at the output Out on the basis of the signal at the “Feedback” input.
  • Voltage converter 10, series circuit 2 and network 14 form a control circuit which keeps the voltage at point P1 constant. Deviating voltages are detected by the detector 16 and the monitoring device 17.
  • a line 24 represents the time course of the supply voltage of the series circuit 2 over several months.
  • the course of the supply voltage is shown only as an example and in a very simplified manner.
  • the monitoring device 17 monitors the supply voltage, that is to say the voltage at the output Out of the voltage converter 10, and generates a first error message when the supply voltage falls below a lower limit value U0 of, for example, 23 V. It also monitors whether the supply voltage exceeds a first limit value U2, a second limit value U3 and an upper limit value U4 and generates a second error message (exceeding U2), a third error message (exceeding U3) and a fourth error message when the above limit values are exceeded (Crossing of U4).
  • the first and second limit values U2, U3 have been determined as a function of an initial value U1 of the supply voltage, which corresponds to a supply voltage when the elevator installation is started up or last serviced.
  • the two limit values U2, U3 are each greater than the initial value U1 by a fixed value. However, it is also possible to set the two limit values independently of an initial value.
  • the monitoring device 17 additionally checks whether a change dU1 in the supply voltage within a first time period (t1-t2) exceeds a first change limit value and also whether a change in the supply voltage within a second time period exceeds a second change limit value. A fifth error message is generated if the first change limit value is exceeded and a sixth error message is generated if the second change limit value is exceeded.
  • the monitoring device 17 transmits the error messages mentioned to the error circuit 20, which reacts differently depending on the type of error message.
  • the error circuit 20 Upon transmission of a first error message (falling below U0) or a fourth error message (exceeding U4), the error circuit 20 opens the circuit breaker 9, which switches off the voltage at the input In of the DC-DC voltage converter 10.
  • a second error message (exceeding U2) and a fifth error message (exceeding the first change limit value) are transmitted
  • the error message is only stored in memory 22 and can be read out during the next maintenance.
  • a third error message (exceeding U3) and a sixth error message (exceeding the second change limit value) are transmitted, maintenance is requested via data line 23.

Landscapes

  • Maintenance And Inspection Apparatuses For Elevators (AREA)
  • Indicating And Signalling Devices For Elevators (AREA)
  • Elevator Control (AREA)
  • Keying Circuit Devices (AREA)

Description

Die Erfindung betrifft ein Verfahren zur Überwachung eines Sicherheitskreises einer Aufzugsanlage gemäss dem Oberbegriff des Anspruchs 1 und eine Überwachungseinrichtung für einen Sicherheitskreis einer Aufzugsanlage gemäss dem Oberbegriff des Anspruchs 9.The invention relates to a method for monitoring a safety circuit of an elevator system according to the preamble of claim 1 and a monitoring device for a safety circuit of an elevator system according to the preamble of claim 9.

Die EP 1 090 870 B1 beschreibt ein Verfahren zur Überwachung eines Sicherheitskreises und eine Überwachungseinrichtung für einen Sicherheitskreis einer Aufzugsanlage. Der überwachte Sicherheitskreis weist eine Serienschaltung von Schaltern zur Überwachung von der Sicherheit des Aufzugsbetriebes dienenden Einrichtungen und eine Spannungsquelle zur Speisung der Serienschaltung mit einer Speisespannung auf. Am Ende der Serienschaltung ist eine Schalteinrichtung in Form eines Sicherheitsrelais angeschlossen, das abhängig vom Schaltzustand der Schalter Signale für eine Aufzugssteuerung erzeugt. Falls alle Kontakte des Sicherheitskreises geschlossen sind, wird das Sicherheitsrelais aktiviert. Die Aufzugssteuerung überwacht den Zustand des Sicherheitsrelais und falls das Sicherheitsrelais aktiviert ist, gibt die Aufzugssteuerung beispielsweise einen anstehenden Fahrbefehl frei. Damit ein Sicherheitsrelais mit einer kleinen Spannungsbreite eingesetzt werden kann, wird die Speisespannung so eingestellt, dass die Spannung über dem Sicherheitsrelais konstant ist. Da die von der Spannungsquelle zur Verfügung stellbare Speisespannung nach oben begrenzt ist, wird die Speisespannung überwacht und bei Erreichen eines oberen Grenzwerts von beispielsweise 55 V eine Fehlermeldung erzeugt. Bei Vorliegen der genannten Fehlermeldung wird die Spannungsquelle abgeschaltet und die Aufzugsanlage damit ausser Betrieb gesetzt.The EP 1 090 870 B1 describes a method for monitoring a safety circuit and a monitoring device for a safety circuit of an elevator system. The monitored safety circuit has a series connection of switches for monitoring devices used for the safety of elevator operation and a voltage source for supplying the series connection with a supply voltage. At the end of the series connection, a switching device in the form of a safety relay is connected, which generates signals for an elevator control depending on the switching state of the switches. If all contacts of the safety circuit are closed, the safety relay is activated. The elevator control monitors the status of the safety relay and if the safety relay is activated, the elevator control releases, for example, an upcoming travel command. So that a safety relay with a small voltage range can be used, the supply voltage is set so that the voltage across the safety relay is constant. Since the supply voltage that can be provided by the voltage source has an upper limit, the supply voltage is monitored and an error message is generated when an upper limit value of 55 V, for example, is reached. If the mentioned error message is present, the voltage source is switched off and the elevator system is thus put out of operation.

Demgegenüber ist es insbesondere die Aufgabe der Erfindung, ein erweitertes Verfahren zur Überwachung eines Sicherheitskreises einer Aufzugsanlage und eine Überwachungseinrichtung für einen Sicherheitskreis einer Aufzugsanlage vorzuschlagen, welche eine hohe Verfügbarkeit der Aufzugsanlage ermöglichen. Erfindungsgemäss wird diese Aufgabe mit einem Verfahren mit den Merkmalen des Anspruchs 1 und einer Überwachungseinrichtung mit den Merkmalen des Anspruchs 9 gelöst.In contrast, it is in particular the object of the invention to propose an expanded method for monitoring a safety circuit of an elevator system and a monitoring device for a safety circuit of an elevator system, which enable high availability of the elevator system. According to the invention, this object is achieved with a method with the features of claim 1 and a monitoring device with the features of claim 9.

Beim erfindungsgemässen Verfahren zur Überwachung eines Sicherheitskreises einer Aufzugsanlage wird eine Speisespannung des Sicherheitskreises dahingehend überwacht, ob sie einen oberen Grenzwert von beispielsweise 55 V überschreitet. Der überwachte Sicherheitskreis weist eine Serienschaltung von Schaltern zur Überwachung von der Sicherheit des Aufzugsbetriebes dienenden Einrichtungen und eine Spannungsquelle zur Speisung der Serienschaltung mit der genannten Speisespannung auf. Am Ende der Serienschaltung ist eine Schalteinrichtung beispielsweise in Form eines Sicherheitsrelais angeschlossen, das abhängig vom Schaltzustand der Schalter wenigstens ein Signal für eine Aufzugssteuerung erzeugt. Die Speisespannung wird so eingestellt, dass die Spannung über der Schalteinrichtung konstant ist. Die Einstellung erfolgt insbesondere mittels einer Regelung der Spannung über der Schalteinrichtung mit der Speisespannung als Stellgrösse. Zusätzlich wird zumindest eine weitere Kenngrösse eines Verlaufs der Speisespannung bestimmt und ausgewertet.In the method according to the invention for monitoring a safety circuit of an elevator installation, a supply voltage of the safety circuit is monitored to determine whether it exceeds an upper limit value of 55 V, for example. The monitored safety circuit has a series connection of switches for monitoring devices serving for the safety of the elevator operation and a voltage source for supplying the series connection with the mentioned supply voltage. At the end of the series connection, a switching device is connected, for example in the form of a safety relay, which, depending on the switching state of the switches, generates at least one signal for elevator control. The supply voltage is set so that the voltage across the switching device is constant. The setting is made in particular by regulating the voltage across the switching device with the supply voltage as the manipulated variable. In addition, at least one further parameter of a course of the supply voltage is determined and evaluated.

Der Spannungsabfall über der Serienschaltung der Schalter stellt ein Mass für den Gesamtwiderstand der Serienschaltung dar. Der Gesamtwiderstand ergibt sich aus der Summe der einzelnen Widerstände der in Serie geschalteten Schalter. Der Widerstand eines Schalters, beispielsweise eines Türkontaktschalters, mittels dem geprüft werden kann, ob eine Schacht- oder Kabinentür geschlossen ist, kann ansteigen, wenn der Schalter mit der Zeit verschmutzt wird oder Kontakte korrodieren. Der genannte Gesamtwiderstand kann damit einen Hinweis geben, dass wenigstens einer der in Serie geschalteten Schalter in nächster Zeit ausfallen kann. Ausserdem ist die Höhe der Speisespannung nach oben begrenzt, so dass ein steigender Gesamtwiderstand nur bis zu einem gewissen Mass durch Erhöhung der Speisespannung ausgeglichen werden kann. Wenn die Speisespannung den genannten oberen Grenzwert erreicht, wird die Versorgungsspannung insbesondere abgeschaltet und damit die Aufzugsanlage deaktiviert.The voltage drop across the series connection of the switches represents a measure of the total resistance of the series connection. The total resistance results from the sum of the individual resistances of the switches connected in series. The resistance of a switch, for example a door contact switch, by means of which it can be checked whether a shaft or cabin door is closed, can increase if the switch becomes dirty over time or contacts corrode. The total resistance mentioned can thus indicate that at least one of the switches connected in series can fail in the near future. In addition, the upper limit of the supply voltage is limited, so that an increasing total resistance can only be compensated to a certain extent by increasing the supply voltage. When the supply voltage reaches the upper limit mentioned, the supply voltage is switched off, in particular, and the elevator system is thus deactivated.

Bei konstanter Spannung über der Schalteinrichtung, also am Ende der Serienschaltung der Schalter ist direkt die genannte Speisespannung ein Mass für den Gesamtwiderstand der Serienschaltung. Durch die erfindungsgemässe Bestimmung und Auswertung zumindest einer weiteren Kenngrösse des Verlaufs der Speisespannung kann schon vor Erreichen des oberen Grenzwerts eine drohende Abschaltung der Aufzugsanlage erkannt und rechtzeitig Gegenmassnahmen eingeleitet werden. Da die Speisespannung für den ordnungsgemässen Betrieb der Aufzugsanlage eingestellt wird, kann sie einfach und kostengünstig ermittelt werden. Damit kann das genannte Verfahren ebenfalls einfach und kostengünstig durchgeführt werden.With a constant voltage across the switching device, that is to say at the end of the series connection of the switches, the supply voltage mentioned is a measure of the total resistance of the series connection. By determining and evaluating at least one further characteristic of the course of the supply voltage according to the invention, an imminent shutdown of the elevator system can be recognized before the upper limit value is reached and countermeasures can be initiated in good time. Since the supply voltage for the proper operation of the elevator system is set, it can be determined easily and inexpensively. The method mentioned can thus also be carried out simply and inexpensively.

Erfindungsgemäss wird als weitere Kenngrösse geprüft, ob eine Änderung der Speisespannung innerhalb einer ersten Zeitspanne einen ersten Änderungs-Grenzwert überschreitet. Damit wird quasi ein Gradient der Speisespannung überwacht. Die genannte erste Zeitspanne kann beispielsweise als eine Stunde, ein Tag, eine Woche oder einen Monat ausgeführt sein. Mit einer kurzen Zeitspanne, beispielsweise von einer Stunde oder einem Tag kann insbesondere eine kurzfristige Änderung des Widerstands eines Schalters erkannt und kurzfristig darauf reagiert werden. Die Änderung kann beispielsweise durch ein plötzliches Eindringen von Schmutz oder Feuchtigkeit in einen Schalter hervorgerufen werden. Mit einer längeren Zeitspanne können längerfristige Änderungen des Gesamtwiderstands, beispielsweise durch eine langsam fortschreitende Korrosion von Kontakten erkannt werden.According to the invention, a further parameter is checked as to whether a change in the supply voltage exceeds a first change limit value within a first time period. A gradient of the supply voltage is thus monitored. The mentioned first period of time can be carried out, for example, as an hour, a day, a week or a month. With a short period of time, for example of an hour or a day, in particular a short-term change in the resistance of a switch can be recognized and reacted to in a short time. The change can be caused, for example, by a sudden penetration of dirt or moisture into a switch. With a longer period of time, longer-term changes in the total resistance, for example due to slowly progressing corrosion of contacts, can be recognized.

In Ausgestaltung der Erfindung wird als weitere Kenngrösse bestimmt, ob die Speisespannung einen ersten Grenzwert überschreitet, wobei der erste Grenzwert kleiner als der obere Grenzwert ist. Der erste Grenzwert kann beispielsweise zwischen 30 V und 50 V, insbesondere 40 V betragen. Damit kann sehr einfach schon vor Erreichen des oberen Grenzwerts und dem Deaktivieren der Aufzugsanlage eine Gegenmassnahme eingeleitet werden.In an embodiment of the invention, a further parameter is used to determine whether the supply voltage exceeds a first limit value, the first limit value being less than the upper limit value. The first limit value can be between 30 V and 50 V, in particular 40 V, for example. This means that a countermeasure can be initiated very easily before the upper limit value is reached and the elevator system is deactivated.

In Ausgestaltung der Erfindung wird als weitere Kenngrösse bestimmt, ob die Speisespannung einen zweiten Grenzwert überschreitet, welcher grösser als der erste Grenzwert und kleiner als der obere Grenzwert ist. Der zweite Grenzwert kann beispielsweise zwischen 45 V und 50 V, insbesondere 50 V betragen. Durch die einfache Prüfung, ob neben dem ersten auch ein zweiter Grenzwert überschritten ist, kann das Überschreiten des ersten Grenzwerts als eine erste Warnung und das Überschreiten des zweiten Grenzwerts als eine zweite, ernsthaftere oder wichtigere Warnung angesehen werden.In an embodiment of the invention, a further parameter is used to determine whether the supply voltage exceeds a second limit value which is greater than the first limit value and less than the upper limit value. The second limit value can be between 45 V and 50 V, in particular 50 V, for example. By simply checking whether a second limit value has also been exceeded in addition to the first, exceeding the first limit value can be regarded as a first warning and exceeding the second limit value as a second, more serious or more important warning.

Neben dem ersten und zweiten Grenzwert können auch noch weitere Grenzwerte überwacht werden.In addition to the first and second limit values, other limit values can also be monitored.

In Ausgestaltung der Erfindung werden der erste und/oder zweite Grenzwert in Abhängigkeit von einem Anfangswert der Speisespannung festgelegt. Damit können die Grenzwerte besonders gut an die tatsächlichen Begebenheiten der Aufzugsanlage angepasst werden. Der erste Grenzwert kann beispielsweise 10 V und der zweite Grenzwert beispielsweise 20 V grösser als der Anfangswert der Speisespannung sein.In an embodiment of the invention, the first and / or second limit value are determined as a function of an initial value of the supply voltage. The limit values can thus be adapted particularly well to the actual conditions of the elevator system. The first limit value can be, for example, 10 V and the second limit value, for example, 20 V greater than the initial value of the supply voltage.

In Ausgestaltung der Erfindung entspricht der genannte Anfangswert einer Speisespannung nach einer Erstinbetriebnahme oder nach einer Wartung der Aufzugsanlage. Nach einer Erstinbetriebnahme oder nach einer Wartung der Aufzugsanlage kann davon ausgegangen werden, dass alle Schalter des Sicherheitskreises geprüft und als in Ordnung befunden wurden. Damit stellt die sich dann einstellende Speisespannung einen guten und sichere Referenz- oder Anfangswert dar. Vergrössert sich die Speisespannung und damit der Gesamtwiderstand der Schalter des Sicherheitskreises signifikant gegenüber diesem Anfangswert, so kann mit grosser Wahrscheinlichkeit auf ein Problem bei einem oder mehreren Schaltern geschlossen werden.In an embodiment of the invention, the mentioned initial value corresponds to a supply voltage after initial commissioning or after maintenance of the elevator system. After initial commissioning or after maintenance of the elevator system, it can be assumed that all switches in the safety circuit have been checked and found to be in order. The supply voltage that then arises represents a good and safe reference or initial value. If the supply voltage and thus the total resistance of the switches in the safety circuit increase significantly compared to this initial value, a problem with one or more switches can be concluded with a high degree of probability.

In Ausgestaltung der Erfindung wird als weitere Kenngrösse geprüft, ob eine Änderung der Speisespannung innerhalb einer zweiten Zeitspanne einen zweiten Änderungs-Grenzwert überschreitet. Damit können vorteilhafterweise beispielsweise gleichzeitig kurzfristige und längerfristigere Änderungen überwacht werden.In an embodiment of the invention, a further parameter is checked as to whether a change in the supply voltage exceeds a second change limit value within a second time period. In this way, for example, short-term and longer-term changes can advantageously be monitored simultaneously.

Es können zusätzlich auch weitere Zeitspannen mit zugehörigen Änderungs-Grenzwerten überwacht werden.Additional time periods with associated change limit values can also be monitored.

In Ausgestaltung der Erfindung erfolgt als Auswertung der wenigstens einen weiteren Kenngrösse eine Eintragung in einen auslesbaren Speicher, insbesondere in einen Fehlerspeicher oder einer Fehlerschaltung. Der Speicher kann beispielsweise im Rahmen einer Wartung ausgelesen werden. Die Wartung kann beispielsweise durch einen Wartungstechniker vor Ort ausgeführt werden. Es ist aber ebenfalls möglich, dass die Wartung als eine so genannte Fernwartung durchgeführt wird, bei der über eine definierte Schnittstelle von aussen, beispielsweise über eine Datenleitung auf den Fehlerspeicher zugegriffen werden kann. In den Speicher wird insbesondere eingetragen ob und gegebenenfalls wann die Speisespannung oder deren zeitlichen Verlauf welchen Grenzwert überschritten hat. Damit kann im Rahmen der Wartung einfach und kostengünstig geprüft werden, ob die Schalter der Sicherheitseinrichtung genauer überprüft werden müssen.In an embodiment of the invention, as an evaluation of the at least one further parameter, an entry is made in a readable memory, in particular in an error memory or an error circuit. The memory can be read out, for example, as part of maintenance. The maintenance can, for example, be carried out by a maintenance technician on site. However, it is also possible for the maintenance to be carried out as a so-called remote maintenance, in which the fault memory can be accessed from outside via a defined interface, for example via a data line. In particular, whether and is entered in the memory if applicable, when the supply voltage or its time course has exceeded which limit value. As a result, it can be checked simply and inexpensively as part of maintenance whether the switches of the safety device need to be checked more precisely.

In Ausgestaltung der Erfindung wird als Auswertung der wenigstens einen weiteren Kenngrösse eine Wartung der Aufzugsanlage angefordert. Die Anforderung der Wartung kann beispielsweise über eine Schnittstelle zu einer zentralen Wartungszentrale über eine Datenleitung erfolgen. Beispielsweise kann, wenn die Speisespannung den ersten Grenzwert überschreitet, ein Eintrag in den genannten Speicher erfolgen. Die Höhe der Speisespannung wird in diesem Fall zwar als ein wenig hoch, aber noch nicht als sehr kritisch angesehen. Eine Überprüfung im Rahmen der nächsten Wartung wird daher als ausreichend angesehen. Wenn die Speisespannung dann zusätzlich den zweiten Grenzwert überschreitet, wird es als recht wahrscheinlich angesehen, dass sie ohne Gegenmassnahmen in naher Zukunft auch noch den oberen Grenzwert erreicht und es zu einer Deaktivierung der Aufzugsanlage kommt. Um dies sicher zu vermeiden, wird bei Erreichen des zweiten Grenzwerts eine Wartung der Aufzugsanlage angefordert. Damit wird eine besonders hohe Verfügbarkeit der Aufzugsanlage erreicht. Bei der Anforderung der Wartung kann insbesondere auch der Grund für die Anforderung, also im beschriebenen Beispiel das Erreichen des zweiten Grenzwerts durch die Speisespannung übermittelt werden.In an embodiment of the invention, maintenance of the elevator system is requested as an evaluation of the at least one further parameter. Maintenance can be requested, for example, via an interface to a central maintenance center via a data line. For example, if the supply voltage exceeds the first limit value, an entry can be made in said memory. The level of the supply voltage is considered to be a little high in this case, but not yet very critical. A check as part of the next maintenance is therefore considered sufficient. If the supply voltage then additionally exceeds the second limit value, it is considered quite likely that without countermeasures it will also reach the upper limit value in the near future and the elevator system will be deactivated. To avoid this, maintenance of the elevator system is requested when the second limit value is reached. A particularly high availability of the elevator system is thus achieved. When the maintenance is requested, the reason for the request, in particular the reaching of the second limit value by the supply voltage in the example described, can also be transmitted.

Die oben genannte Aufgabe wird auch durch eine Überwachungseinrichtung für einen Sicherheitskreis einer Aufzugsanlage gelöst, wobei der Sicherheitskreis eine Serienschaltung von Schaltern zur Überwachung von der Sicherheit des Aufzugsbetriebes dienenden Einrichtungen und eine Spannungsquelle zur Speisung der Serienschaltung mit einer Speisespannung aufweist, und am Ende der Serienschaltung mindestens eine Schalteinrichtung angeschlossen ist, die abhängig vom Schaltzustand der Schalter wenigstens ein Signal für eine Aufzugssteuerung erzeugt. Die Speisespannung wird so eingestellt, dass die Spannung über der Schalteinrichtung konstant gehalten wird. Die Überwachungseinrichtung ist dafür vorgesehen, zu überwachen, ob die Speisespannung einen oberen Grenzwert überschreitet. Erfindungsgemäss ist die Überwachungseinrichtung ausserdem dafür vorgesehen, wenigstens eine weitere Kenngrösse eines Verlaufs der Speisespannung zu bestimmen und auszuwerten.The above-mentioned object is also achieved by a monitoring device for a safety circuit of an elevator system, the safety circuit having a series connection of switches for monitoring devices serving for the safety of the elevator operation and a voltage source for supplying the series connection with a supply voltage, and at least at the end of the series connection a switching device is connected which, depending on the switching state of the switches, generates at least one signal for elevator control. The supply voltage is set so that the voltage across the switching device is kept constant. The monitoring device is intended to monitor whether the supply voltage exceeds an upper limit value. According to the invention, the monitoring device is also provided for determining and evaluating at least one further parameter of a course of the supply voltage.

Weitere Vorteile, Merkmale und Einzelheiten der Erfindung ergeben sich anhand der nachfolgenden Beschreibung von Ausführungsbeispielen sowie anhand der Zeichnungen, in welchen gleiche oder funktionsgleiche Elemente mit identischen Bezugszeichen versehen sind.Further advantages, features and details of the invention result from the following description of exemplary embodiments and from the drawings, in which identical or functionally identical elements are provided with identical reference numerals.

Dabei zeigen:

Fig. 1
eine schematische Darstellung eines Sicherheitskreises mit geregelter Spannung über einer Schalteinrichtung,
Fig. 2
Einzelheiten eines der Spannungsregelung dienenden Netzwerkes und
Fig. 3
einen beispielhaften Verlauf einer Speisespannung des Sicherheitskreises über der Zeit.
Show:
Fig. 1
1 shows a schematic representation of a safety circuit with regulated voltage across a switching device,
Fig. 2
Details of a voltage regulation network and
Fig. 3
an exemplary course of a supply voltage of the safety circuit over time.

In der Fig. 1 ist mit 1 ein Sicherheitskreis bezeichnet, der aus einer Serienschaltung 2 von Schaltern bzw. von Kontakten 3, aus mindestens einer Schalteinrichtung in Form eines Sicherheitsrelais 4, aus einem als Speisung 5 dienende Spannungsquelle in Form eines Spannungskonverters 10 und aus einer Überwachungseinheit 6 besteht, wobei das Signal des Sicherheitsrelais 4 einer Aufzugssteuerung 7 zugeführt wird. Die Schalter 3 dienen zur Überwachung von der Sicherheit des Aufzugsbetriebes dienenden Einrichtungen, beispielsweise ist Schalter 3 als ein so genannter Türkontaktschalter ausgeführt, der dann geschlossen ist, wenn eine zugehörige Kabinentür 18 geschlossen ist.In the Fig. 1 1 denotes a safety circuit which consists of a series connection 2 of switches or contacts 3, at least one switching device in the form of a safety relay 4, of a voltage source serving as supply 5 in the form of a voltage converter 10 and of a monitoring unit 6, whereby the signal of the safety relay 4 is fed to an elevator control 7. The switches 3 are used to monitor devices serving for the safety of the elevator operation, for example switch 3 is designed as a so-called door contact switch, which is then closed when an associated car door 18 is closed.

An einer Eingangsleitung 8 steht beispielsweise 24 V DC (Gleichspannung) an, die einem Schutzschalter 9 zugeführt wird. Der Schutzschalter 9 ist ausgangsseitig mit dem Eingang In des DC-DC Spannungskonverters 10 verbunden, der die 24 V DC auf beispielsweise 25 V bis 50 V DC erhöht. Die Ausgangsspannung des DC-DC Spannungskonverters 10 dient als Speisespannung der Serienschaltung 2 der Schalter 3. Ein Ende der Serienschaltung 2 der Kontakte 3 ist über einen Messwiderstand 11 an den Ausgang Out des Spannungskonverters 10 geschaltet, das andere Ende der Serienschaltung 2 ist mit den Sicherheitsrelais 4 verbunden. Der zweite Anschluss eines jeden Sicherheitsrelais 4 ist an einen mit einem nach unten gerichteten Pfeil symbolisierten gemeinsamen Leiter angeschlossen. Der Schaltzustand des Sicherheitsrelais 4 wird auf einen Relaiskontakt 12 übertragen, über den die Aufzugssteuerung 7 eine Signalspannung führt. Zum Schutze des Sicherheitskreises 1 vor durch Schalten von Induktivitäten entstehenden Spannungsspitzen ist beispielsweise eine Schutzdiode 13 über die Sicherheitsrelais 4 geschaltet.For example, 24 V DC (DC voltage) is present on an input line 8 and is supplied to a circuit breaker 9. The circuit breaker 9 is connected on the output side to the input In of the DC-DC voltage converter 10, which increases the 24 V DC to, for example, 25 V to 50 V DC. The output voltage of the DC-DC voltage converter 10 serves as the supply voltage for the series circuit 2 of the switches 3. One end of the series circuit 2 of the contacts 3 is connected to the output Out of the voltage converter 10 via a measuring resistor 11, the other end of the series circuit 2 is connected to the safety relays 4 connected. The second connection of each safety relay 4 is connected to a common conductor symbolized by a downward-pointing arrow. The switching state of the safety relay 4 is transmitted to a relay contact 12, via which the elevator control 7 carries a signal voltage. To protect the safety circuit 1 from inductance switching For example, a protective diode 13 is connected via the safety relays 4 to voltage peaks.

Die zu regelnde Spannung über dem Sicherheitsrelais 4 wird am Punkt P1 abgegriffen und einem Netzwerk 14 bestehend aus passiven Elementen zugeführt, welches mit dem Spannungskonverter 10 verbunden ist. Falls alle Kontakte 3 der Serienschaltung 2 geschlossen sind, wird die Spannung über dem Sicherheitsrelais 4 konstant auf beispielsweise 25 V DC gehalten. Falls die Serienschaltung 2 offen ist, wird die Ausgangsspannung des Spannungskonverters 10 mittels eines Begrenzers 15 auf beispielsweise 53 V DC gehalten.The voltage to be regulated across the safety relay 4 is tapped at point P1 and fed to a network 14 consisting of passive elements, which is connected to the voltage converter 10. If all contacts 3 of the series circuit 2 are closed, the voltage across the safety relay 4 is kept constant, for example at 25 V DC. If the series circuit 2 is open, the output voltage of the voltage converter 10 is kept at, for example, 53 V DC by means of a limiter 15.

Die Überwachungseinheit 6 besteht aus einem Überspannungsdetektor 16, einer Überwachungseinrichtung 17 der Speisespannung und einem Überstromdetektor 19. Der Überspannungsdetektor 16 überwacht die Spannung über dem Sicherheitsrelais 4 und erzeugt eine Fehlermeldung, falls die überwachte Spannung beispielsweise 28 V DC übersteigt. Auf die Überwachungseinrichtung 17 der Speisespannung wird weiter unten näher eingegangen. Der Überstromdetektor 19 überwacht den in der Serienschaltung 2 fliessenden Strom in der Form einer Spannung über dem Messwiderstand 11 und erzeugt eine Fehlermeldung, falls der überwachte Strom beispielsweise 300 mA übersteigt. Die Fehlermeldungen der Detektoren 16,19 sowie der Überwachungseinrichtung 17 werden einer Fehlerschaltung 20 zugeführt, die bei Vorliegen bestimmter Fehlermeldungen den Schutzschalter 9 öffnet, der die Spannung am Eingang In des DC-DC Spannungskonverters 10 abschaltet. Die Fehlerschaltung 20 speichert die aufgetretenen Fehler in einem auslesbaren Speicher 22, wobei diese beispielsweise von einer dargestellten Wartungszentrale über eine Datenleitung 23 ausgelesen werden können. Zur manuellen Rücksetzung der Fehlerschaltung 20 ist ein Taster 21 vorgesehen. Es ist auch möglich, dass die Rücksetzung der Fehlerschaltung 20 von der Wartungszentrale über die Datenleitung 23 erfolgt. Über die Datenleitung 23 kann auch eine Wartung der Aufzugsanlage bei der Wartungszentrale angefordert werden.The monitoring unit 6 consists of an overvoltage detector 16, a monitoring device 17 for the supply voltage and an overcurrent detector 19. The overvoltage detector 16 monitors the voltage across the safety relay 4 and generates an error message if the monitored voltage exceeds 28 V DC, for example. The monitoring device 17 of the supply voltage is discussed in more detail below. The overcurrent detector 19 monitors the current flowing in the series circuit 2 in the form of a voltage across the measuring resistor 11 and generates an error message if the monitored current exceeds 300 mA, for example. The error messages from the detectors 16, 19 and the monitoring device 17 are fed to an error circuit 20 which, in the presence of certain error messages, opens the circuit breaker 9, which switches off the voltage at the input In of the DC-DC voltage converter 10. The error circuit 20 stores the errors that have occurred in a readable memory 22, which can be read out, for example, by a maintenance center shown via a data line 23. A button 21 is provided for manually resetting the error circuit 20. It is also possible that the fault circuit 20 is reset by the maintenance center via the data line 23. Maintenance of the elevator system can also be requested from the maintenance center via the data line 23.

Fig. 2 zeigt Einzelheiten des Netzwerkes 14 und des Begrenzers 15 zur Spannungsregelung über dem Sicherheitsrelais 4. Falls die Serienschaltung 2 offen ist, wird die Ausgangsspannung des Spannungskonverters 10 mittels einer Zenerdiode Z1 auf beispielsweise 53 V DC konstant gehalten. Ein Kondensator C1 erhöht das dynamische Verhalten des Begrenzers 15.
Falls alle Kontakte 3 der Serienschaltung 2 geschlossen sind, wird die Spannung am Punkt P1 über dem Sicherheitsrelais 4 konstant auf beispielsweise 25 V DC gehalten. Die Spannung am Punkt P1 wird über eine Rückwärtsstrom verhindernde Diode D1 einem Spannungsteiler bestehend aus Widerstand R3 und Widerstand R2 zugeführt, wobei der Spannungsteilerpunkt P2 mit dem Begrenzer 15 und einem Begrenzerwiderstand R1 verbunden ist, der andererseits an den Eingang "Feedback" des Spannungskonverters 10 angeschlossen ist. Aufgrund des Signales am Eingang "Feedback" regelt der Spannungskonverter 10 die Spannung am Ausgang Out. Spannungskonverter 10, Serienschaltung 2 und Netzwerk 14 bilden einen Regelkreis, der die Spannung am Punkt P1 konstant hält. Abweichende Spannungen werden vom Detektor 16 und der Überwachungseinrichtung 17 erfasst. Fig. 2 shows details of the network 14 and the limiter 15 for voltage regulation via the safety relay 4. If the series circuit 2 is open, the output voltage of the voltage converter 10 is kept constant at, for example, 53 V DC by means of a Zener diode Z1. A capacitor C1 increases the dynamic Behavior of the limiter 15.
If all contacts 3 of the series circuit 2 are closed, the voltage at point P1 across the safety relay 4 is kept constant, for example at 25 V DC. The voltage at point P1 is fed via a reverse current-preventing diode D1 to a voltage divider consisting of resistor R3 and resistor R2, the voltage divider point P2 being connected to limiter 15 and a limiter resistor R1, which on the other hand is connected to the "feedback" input of voltage converter 10 is. The voltage converter 10 regulates the voltage at the output Out on the basis of the signal at the “Feedback” input. Voltage converter 10, series circuit 2 and network 14 form a control circuit which keeps the voltage at point P1 constant. Deviating voltages are detected by the detector 16 and the monitoring device 17.

In Zusammenhang mit der Fig. 3 wird die Funktionsweise der Überwachungseinrichtung 17 der Speisespannung näher erläutert. In der Fig. 3 stellt eine Linie 24 den zeitlichen Verlauf der Speisespannung der Serienschaltung 2 über mehrere Monate dar. Der Verlauf der Speisespannung ist nur exemplarisch und sehr vereinfacht dargestellt.In connection with the Fig. 3 the operation of the monitoring device 17 of the supply voltage is explained in more detail. In the Fig. 3 A line 24 represents the time course of the supply voltage of the series circuit 2 over several months. The course of the supply voltage is shown only as an example and in a very simplified manner.

Die Überwachungseinrichtung 17 überwacht die Speisespannung, also die Spannung am Ausgang Out des Spannungskonverters 10 und erzeugt eine erste Fehlermeldung, wenn die Speisespannung einen unteren Grenzwert U0 von beispielsweise 23 V unterschreitet. Sie überwacht ausserdem, ob die Speisespannung einen ersten Grenzwert U2, einen zweiten Grenzwert U3 und einen oberen Grenzwert U4 überschreitet und erzeugt beim Überschreiten der genannten Grenzwerte eine zweite Fehlermeldung (Überschreiten von U2), eine dritte Fehlermeldung (Überschreiten von U3) und eine vierte Fehlermeldung (Überschreiten von U4).The monitoring device 17 monitors the supply voltage, that is to say the voltage at the output Out of the voltage converter 10, and generates a first error message when the supply voltage falls below a lower limit value U0 of, for example, 23 V. It also monitors whether the supply voltage exceeds a first limit value U2, a second limit value U3 and an upper limit value U4 and generates a second error message (exceeding U2), a third error message (exceeding U3) and a fourth error message when the above limit values are exceeded (Crossing of U4).

Der erste und zweite Grenzwert U2, U3 sind dabei in Abhängigkeit von einem Anfangswert U1 der Speisespannung festgelegt worden, welche eine Speisespannung bei einer Erstinbetriebnahme oder einer letzten Wartung der Aufzugsanlage entspricht. Die beiden Grenzwerte U2, U3 sind dabei um jeweils einen festgelegten Wert grösser als der Anfangswert U1. Es ist aber auch möglich, dass die beiden Grenzwerte unabhängig von einem Anfangswert festzulegen.The first and second limit values U2, U3 have been determined as a function of an initial value U1 of the supply voltage, which corresponds to a supply voltage when the elevator installation is started up or last serviced. The two limit values U2, U3 are each greater than the initial value U1 by a fixed value. However, it is also possible to set the two limit values independently of an initial value.

Daneben prüft die Überwachungseinrichtung 17 zusätzlich, ob eine Änderung dU1 der Speisespannung innerhalb einer ersten Zeitspanne (t1 - t2) einen ersten Änderungs-Grenzwert überschreitet und ausserdem ob eine Änderung der Speisespannung innerhalb einer zweiten Zeitspanne einen zweiten Änderungs-Grenzwert überschreitet. Bei Überschreiten des ersten Änderungs-Grenzwerts wird eine fünfte Fehlermeldung und bei Überschreiten des zweiten Änderungs-Grenzwerts eine sechste Fehlermeldung erzeugt.In addition, the monitoring device 17 additionally checks whether a change dU1 in the supply voltage within a first time period (t1-t2) exceeds a first change limit value and also whether a change in the supply voltage within a second time period exceeds a second change limit value. A fifth error message is generated if the first change limit value is exceeded and a sixth error message is generated if the second change limit value is exceeded.

Die Überwachungseinrichtung 17 übermittelt die genannten Fehlermeldungen an die Fehlerschaltung 20, die je nach Art der Fehlermeldung unterschiedlich reagiert. Bei Übermittlung einer ersten Fehlermeldung (Unterschreiten von U0) oder einer vierten Fehlermeldung (Überschreiten von U4) öffnet die Fehlerschaltung 20 den Schutzschalter 9, der die Spannung am Eingang In des DC-DC Spannungskonverters 10 abschaltet. Bei der Übermittlung einer zweiten Fehlermeldung (Überschreiten von U2) und einer fünften Fehlermeldung (Überschreiten des ersten Änderungs-Grenzwerts) wird die Fehlermeldung nur im Speicher 22 abgelegt und kann bei der nächsten Wartung ausgelesen werden. Bei der Übermittlung einer dritten Fehlermeldung (Überschreiten von U3) und einer sechsten Fehlermeldung (Überschreiten des zweiten Änderungs-Grenzwerts) wird über die Datenleitung 23 eine Wartung angefordert.The monitoring device 17 transmits the error messages mentioned to the error circuit 20, which reacts differently depending on the type of error message. Upon transmission of a first error message (falling below U0) or a fourth error message (exceeding U4), the error circuit 20 opens the circuit breaker 9, which switches off the voltage at the input In of the DC-DC voltage converter 10. When a second error message (exceeding U2) and a fifth error message (exceeding the first change limit value) are transmitted, the error message is only stored in memory 22 and can be read out during the next maintenance. When a third error message (exceeding U3) and a sixth error message (exceeding the second change limit value) are transmitted, maintenance is requested via data line 23.

Claims (9)

  1. A method for monitoring a safety circuit (1) of a lift system, the safety circuit (1) comprising a series connection (2) of switches (3) for monitoring the safety of devices (18) serving the lift operation, and a voltage source (10) for supplying the series connection (2) with a supply voltage, and at least one switch device (4) being connected to the end of the series connection (2), which device generates at least one signal for controlling (7) a lift according to the switching state of the switches (3), the method including at least the following steps:
    - setting the supply voltage in such a way that the voltage is kept constant across the switch device (4),
    - monitoring whether the supply voltage exceeds an upper limit value (U4),
    at least one further parameter of a curve of the supply voltage is determined and evaluated,
    characterized in that
    as a further parameter, it is checked whether a change in the supply voltage exceeds a first change limit value within a first time period.
  2. The method according to claim 1,
    characterized in that
    as a further parameter, it is determined whether the supply voltage exceeds a first limit value (U2).
  3. The method according to claim 2,
    characterized in that
    as a further parameter, it is determined whether the supply voltage exceeds a second limit value (U3) which is greater than the first limit value.
  4. The method according to either claim 2 or claim 3,
    characterized in that
    the first and/or the second limit value (U2, U3) are/is established according to a starting value (U1) of the supply voltage.
  5. The method according to claim 4,
    characterized in that
    the aforementioned starting value (U1) corresponds to a supply voltage after initial start-up or after maintenance of the lift system.
  6. The method according to any of claims 1 to 5,
    characterized in that
    as a further parameter, it is checked whether a change in the supply voltage exceeds a first change limit value within a second time period.
  7. The method according to any of claims 1 to 6,
    characterized in that
    in order to evaluate at least one further parameter, an entry is made in a readable memory (22).
  8. The method according to any of claims 1 to 7,
    characterized in that
    maintenance of the lift system is requested in order to evaluate the at least one further parameter.
  9. A monitoring device for a safety circuit (1) of a lift system, the safety circuit (1) comprising a series connection (2) of switches (3) for monitoring the safety of devices (18) serving the lift operation, and a voltage source (10) for supplying the series connection (2) with a supply voltage, and at least one switch device (4) being connected to the end of the series connection (2), which device generates at least one signal for controlling (7) a lift according to the switching state of the switches (3), the supply voltage being set in such a way that the voltage is constant across the switch device (4), and the monitoring device (17) being provided to monitor whether the supply voltage exceeds an upper limit value,
    the monitoring device (17) also being provided for determining and evaluating at least one further parameter of a curve of the supply voltage,
    characterized in that
    the monitoring device (17) is also provided for checking whether a change in the supply voltage exceeds a first change limit value within a first time period.
EP16820226.5A 2015-12-17 2016-12-16 Method for monitoring a safety circuit of a lift assembly and monitoring device for a safety circuit of a lift assembly Active EP3390259B1 (en)

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US10636272B2 (en) * 2018-09-26 2020-04-28 Otis Elevator Company Time domain reflectometry for electrical safety chain condition based maintenance
US20210182386A1 (en) * 2019-12-11 2021-06-17 Samsung Electronics Co., Ltd. Electronic apparatus that monitors a safety function and a controlling method thereof
US20230109720A1 (en) * 2020-03-31 2023-04-13 Inventio Ag Safety monitoring device, and method for monitoring the safety of an elevator system

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JP4507292B2 (en) * 1999-04-23 2010-07-21 ソニー株式会社 Constant voltage regulator circuit
EP1090870B1 (en) * 1999-10-08 2007-07-04 Inventio Ag Safety chain for elevator plant
WO2006108433A1 (en) * 2005-04-11 2006-10-19 Otis Elevator Company Safety circuit for a passenger conveyor system
EP2326006A1 (en) * 2009-11-18 2011-05-25 Inventio AG Switch for an electric unit

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BR112018010425A2 (en) 2018-11-21
ES2785639T3 (en) 2020-10-07
BR112018010425A8 (en) 2019-02-26
EP3390259A1 (en) 2018-10-24
WO2017103039A1 (en) 2017-06-22
HK1253289A1 (en) 2019-06-14
CN108367889A (en) 2018-08-03
AU2016369356B2 (en) 2019-09-26
AU2016369356A1 (en) 2018-07-05
US20190002239A1 (en) 2019-01-03
CA3006409A1 (en) 2017-06-22

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