WO2006002725A1 - Dispositif pour deconnecter de maniere fiable un consommateur electrique, notamment une machine electrique - Google Patents

Dispositif pour deconnecter de maniere fiable un consommateur electrique, notamment une machine electrique Download PDF

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Publication number
WO2006002725A1
WO2006002725A1 PCT/EP2005/005977 EP2005005977W WO2006002725A1 WO 2006002725 A1 WO2006002725 A1 WO 2006002725A1 EP 2005005977 W EP2005005977 W EP 2005005977W WO 2006002725 A1 WO2006002725 A1 WO 2006002725A1
Authority
WO
WIPO (PCT)
Prior art keywords
switching
signal
safety
switching device
fail
Prior art date
Application number
PCT/EP2005/005977
Other languages
German (de)
English (en)
Inventor
Winfried GRÄF
Original Assignee
Pilz Gmbh & Co. Kg
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Pilz Gmbh & Co. Kg filed Critical Pilz Gmbh & Co. Kg
Publication of WO2006002725A1 publication Critical patent/WO2006002725A1/fr

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Classifications

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

Definitions

  • the present invention relates to a device for fault-safe switching off of an electrical load, in particular an electrically driven machine, with a signal encoder for generating an input signal representing a safety requirement, with a safety switching device for fail-safe evaluation of the input signal and for Generating a multi-channel shutdown signal, and with a first and at least one second switching element, which are arranged spatially separated from the safety switching device in series with each other in a Strom ⁇ supply path of the consumer and which are conductive or blocking in response to the multi-channel shutdown signal.
  • the invention further relates to a safety switching device for use in such a device, with at least one input for receiving an input signal from a signal generator, with an evaluation and control unit for error-free evaluation of the input signal and with at least two switching elements whose aid the evaluation and control unit provides a multi-channel switch-off signal at at least two separate outputs.
  • Such a device and such a safety switching device are known for example from EP 1 262 021 Bl.
  • Generic devices are usually used to reliably switch off a technical system whose operation poses a danger to persons, or otherwise bring it into a safe state, if this is necessary.
  • Typical applications are switching off an automatically operating machine in response to the actuation of an emergency stop button and / or when opening a protective door.
  • Further signal transmitters may be light barriers, light grids and the like, or monitoring circuits which have a process variable, such as a rotational speed, a current, a voltage and the like. monitor for compliance with specified limits.
  • the safety switching device serves to evaluate the input signal generated by the signal generator (input from the point of view ofbut ⁇ switching device) fail-safe and to generate depending on a shutdown signal for fail-safe shutdown of the consumer.
  • Genericdepthschalt ⁇ devices are therefore usually builds multi-channel redundant, and they also lead regular internal and / or external Functional tests that ensure the required fault tolerance.
  • safety switching devices in the sense of the present invention require certification by an approved testing authority, such as the TÜV or the professional associations in Germany, which certifies compliance with the safety-related design principles.
  • the output-side contact-type switching elements are dimensioned in a safety switching device with different nominal switching capacity.
  • a timer may be provided, which controls the normally open contacts of the one switching element earlier when switching on and when switching off than the normally open contacts of the redundant, second switching element. Both measures help to reduce the likelihood that the redundant switching elements will weld at the same time.
  • this is achieved by a device of the aforementioned type, in which the safety switching device is designed to switch the first and the second switching element in a time-staggered manner from the conducting to the blocking state.
  • the object is achieved by a safety switching device of the type mentioned at the outset, in which the evaluation and control unit is designed to generate the multi-channel output signal with a time offset, so that a first shutdown signal appears at a first output at a first time and a second Abschalt ⁇ signal at a second output er ⁇ at a second time er ⁇ seems, which is offset in time to the first time.
  • the present invention thus paves the way for achieving an additional fail-safety in the case of a safety-related shutdown of an electrical consumer. That the redundant, external switching elements are opened with a time offset to each other. This reduces the probability that the redundant switching elements will fail at the same time.
  • the error safety is clearly improved compared to generic devices. Since the main change compared to generic devices in Si ⁇ herheitsschalt réelle, the innovation can be implemented very easily and inexpensively in existing existing systems, for example, the sukzes ⁇ sive replacement of defective or routinely replacedhas ⁇ switching devices. The wiring can remain unchanged compared to the known devices.
  • the new safety switching device is distinguished from all hitherto known safety switching devices in that the multichannel switch-off signal contains an "internal" time offset, by means of which external switching elements can be controlled separately in the sense of the present invention.
  • the required Modifi ⁇ cation over previously known safety switching devices is very simple and extremely cost-effective.
  • gat ⁇ inventive contact-type safety devices according to DE 199 54 460 Al or comparable safety switching devices, it is namely sufficient to lead out the switching contacts of the output relay used inperhapsschalt ⁇ device separately from Aus ⁇ gangsan remplin the safety relay.
  • the present invention thus allows in a very simple and cost-effective manner a significantly increased security in generic devices.
  • the stated task is therefore completely solved.
  • the advantages of the present invention have a particularly clear effect, since the use of redundant contactors in the power supply path of a consumer is a typical application in the field of safety technology. Especially for this important application, the heightened safety is achieved in a simple and cost-effective manner.
  • the safety switching device has a third and a fourth switching element for generating the multichannel switch-off signal, wherein the third switching element only determines the switching position of the first switching element and wherein the fourth switching element only controls the switching position of second switching element determined.
  • the third and fourth switching element switching contacts of two separate relays concretizes the present invention to the use of contact-type safety switching devices with potential-free outputs.
  • the basic idea of the present invention can basically also be applied to "modern" safety switching devices with potential-related outputs, this embodiment represents a particularly preferred application, since corresponding safety switching devices are frequently used, especially in existing and / or smaller applications be used, which thus benefit greatly from the increased security.
  • FIG. 2 shows a simplified illustration of a safety switching device for a device according to FIG. 1, and FIG.
  • FIG. 3 shows a simplified representation of the temporal relationships when switching off the machine from FIG. 1 due to the new device.
  • an embodiment of the new device is designated in its entirety by the reference numeral 10.
  • the device 10 serves here to safeguard an automated machining robot 12.
  • the present invention is not limited to this specific application and can equally be used for the safety-related switching off of other electrical consumers.
  • electric drives and / or solenoid valves for hydraulically or pneumatically actuated systems come into consideration as electrical consumers.
  • the device 10 includes a safety switching device 14, the output side drives two external switching elements, which are shown here as contactors 16, 18.
  • the contactors 16, 18 each have a number of switching contacts 20, 22, which are forcibly guided in the preferred embodiment. This means that the switching contacts 20, 22 of each individual contactor 16, 18 are mechanically coupled in such a way that they inevitably occupy the same switching position (open or closed).
  • the switching contacts 20 of the contactor 16 are arranged in series with the switching contacts 22 of the contactor 18, specifically in the power supply path 24 for the robot 12.
  • the safety switching device 14 is connected to a signal transmitter 26, which in the illustrated embodiment is a safety door switch.
  • the safety door switch 26 cooperates with an actuator 28, which is fastened to a protective door 30. If the protective door 30 is closed, the actuator 28 is in the spatial Nahberei ⁇ h of the protective door switch 26, which the protective door switch 26, for example due to a inductive, capacitive, magnetic, mechanical or ander ⁇ far coupling can detect. If the protective door 30 is opened, the actuator 28 is no longer in the vicinity of the protective door switch 26, and the protective door switch 26 then generates an input signal 32 representing a safety requirement.
  • the safety switching device 14 As soon as the safety switching device 14 recognizes the safety requirements (or if a device fault is detected due to an internal functional test), the safety switching device 14 switches off the contactors 16, 18 with the aid of its multi-channel shutdown signal 34, 36, whereupon the switching contacts 20, 22 drop (to be opened).
  • the safety switching device 14 is a relay-based safety switching device with contact-type, potential-free outputs. This is shown in simplified form in FIG. 2, wherein the same reference numerals denote the same elements as before.
  • the safety switching device 14 receives one or more input signals 32 from correspondingly connected signal transmitters 26. Beyond the protective door switch shown in FIG. 1, these can be, for example, emergency stop buttons 26 ', light barriers or light grids 26 ", two-hand buttons,
  • the or the recorded input signals are fed to an evaluation and control unit 38, which is preferably designed to be multichannel-redundant, which is shown in Fig. 2 on the basis of the diagonal dividing line is shown in the evaluation and control unit 38.
  • the evaluation and control unit 38 is constructed with discrete components circuit such as, for example, devices of thethatschalt ⁇ is known, the dung the assignee of the present Erfin under the name "PNOZ ® X" sells.
  • the evaluation and control unit 38 can also be realized with the aid of microcontrollers and / or other highly integrated components.
  • the safety switching device 14 includes two output-side relays 40, 42 whose switching position is determined by the evaluation and control unit 38.
  • Each relay 40, 42 has a number of normally open and normally closed contacts 44, 45, 46.
  • the evaluation and control unit 38 is designed such that it sets the relays 40, 42 at least when the robot 12 is switched off controls. The re-switching also preferably takes place with a time offset from one another.
  • the switching contacts of the two relays 40, 42 are arranged in series with one another between a first connection 48 and a second connection 50 of the safety switching device 14. Such an interconnection is shown again by way of example in FIG. 2 with a dotted line 52.
  • the new safety switching device 14 could have such a "classic" connection of the switching contacts of the two relays 40, 42 in addition to the separately explained lead-out of switching contacts 44, 46 explained below.
  • the switching contacts 44, 45, 46 of the relays 40, 42 are disconnected led out of each other at output terminals 48, 50. In other words, there is only one switching contact between the first terminal 48 and the second terminal 50 thereafter.
  • An operating voltage U B of, for example, 24 V is then applied to the terminal 48.
  • the terminals 50 are connected to the external contactors 16, 18. Due to the staggered control of the relays 40, 42 and the separate lead out of the respective switching contacts 44, 46 so the switching contacts 20, 22 of the contactors 16, 18 are opened with respect to each other in time.
  • not only the normally open contacts 44, 45 of the relays 40, 42 are separately routed to output terminals 48, 50 of the safety switching device 14, but also the corresponding normally closed contacts 46. This provides a separate control of the respective switching position of the make contacts 44, 45 in that the disconnected opener contacts 46 are fed back to a corresponding input terminal of the evaluation and control unit 38.
  • Fig. 3 shows the temporal switching behavior of the external contactors 16, 18, which results from the new safety switching device 14.
  • the upper timing diagram in FIG. 3 shows a schematic progression of the input signal 32, which is transmitted from the signal generator 26 to the safety switching device 14.
  • the input signal 32 goes into a first (active) state, which signals a closed safety door 30 in the embodiment preferred here.
  • the input signal 32 drops back, which is an open one Protective door 30 and / or a defect in the signal chain between safety relay 14 and signal generator 26 represents.
  • the safety switching device 14 evaluates the input signal 32 in a manner known per se in a fail-safe manner and generates the redundant switch-off signals 34, 36 as a function of this.
  • the switch-off signal 34 is activated offset in time with the switch-off signal 36.
  • the contactor 16 is thereafter timed earlier when switching on and when turned off later than the contactor 18.
  • the contactor 18 could be activated earlier or later than the contactor 16, or the activation could be alternately offset.
  • the contactor 16 could be activated or deactivated both before switching on and off at the contactor 18, or vice versa.
  • time offset T v is shown in FIG. 3, which is related in each case to the edges 54, 56 of the input signal 32.
  • the time offset T v symbolizes internal signal run times of the safety switching device 14, these being shown here in an overdriven manner.

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  • Safety Devices In Control Systems (AREA)

Abstract

L'invention concerne un dispositif pour déconnecter de manière fiable un consommateur électrique, ce dispositif comportant un transmetteur de signaux (26) pour générer un signal d'entrée (32) qui représente une exigence de sécurité. Le signal d'entrée (32) est envoyé à un commutateur de sécurité (14) qui, en fonction du signal d'entrée, génère un signal de déconnexion à voies multiples. Ce signal de déconnexion à voies multiples est envoyé à un premier et à au moins un deuxième commutateur (16,18), lesquels sont séparés dans l'espace relativement au commutateur de sécurité (14) et montés en parallèle l'un par rapport à l'autre dans une trajectoire d'alimentation électrique du consommateur. Dans un mode de réalisation, le commutateur de sécurité (14) est conçu pour commuter le premier et le deuxième commutateur (16, 18) de manière décalée dans le temps, pour les faire passer de l'état de conduction à l'état de coupure.
PCT/EP2005/005977 2004-07-01 2005-06-03 Dispositif pour deconnecter de maniere fiable un consommateur electrique, notamment une machine electrique WO2006002725A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004033359.9 2004-07-01
DE200410033359 DE102004033359A1 (de) 2004-07-01 2004-07-01 Vorrichtung zum fehlersicheren Abschalten eines elektrischen Verbrauchers, insbesondere einer elektrisch angetriebenen Maschine

Publications (1)

Publication Number Publication Date
WO2006002725A1 true WO2006002725A1 (fr) 2006-01-12

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PCT/EP2005/005977 WO2006002725A1 (fr) 2004-07-01 2005-06-03 Dispositif pour deconnecter de maniere fiable un consommateur electrique, notamment une machine electrique

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DE (1) DE102004033359A1 (fr)
WO (1) WO2006002725A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20160225563A1 (en) * 2015-02-02 2016-08-04 Omron Corporation Relay unit and method for controlling relay circuit
WO2017207403A1 (fr) * 2016-05-30 2017-12-07 Pilz Gmbh & Co. Kg Dispositif de mise hors circuit sans erreur d'un consommateur
CN108700863A (zh) * 2016-02-08 2018-10-23 菲尼克斯电气公司 安全开关设备

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2053624B1 (fr) * 2007-10-23 2019-06-12 Siemens Aktiengesellschaft Commutateur préfabriqué pour la commutation sécurisée et non sécurisée de sorties
DE102012103015B4 (de) 2012-04-05 2013-12-05 Pilz Gmbh & Co. Kg Sicherheitsschaltvorrichtung mit Schaltelement im Hilfskontaktstrompfad
DE102014116188A1 (de) 2013-11-26 2015-05-28 Pilz Gmbh & Co. Kg System zum fehlersicheren Abschalten eines elektrischen Verbrauchers
DE102014117280A1 (de) * 2014-11-25 2016-05-25 Pilz Gmbh & Co. Kg Sicherheitsschaltgerät zum Ein- und sicheren Ausschalten eines elektrischen Verbrauchers
EP3410458B1 (fr) * 2017-06-02 2019-05-22 Sick AG Circuit à relais de sécurité modulaire destiné à sécuriser et/ou désactiver au moins une machine
DE102022122527A1 (de) 2022-09-06 2024-03-07 Pilz Gmbh & Co. Kg Relaisvorrichtung und Sicherheitsschaltgerät mit mindestens einer Relaisvorrichtung

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4409541A1 (de) * 1994-03-19 1995-09-21 Leon Helma Christina Sicherheitstechnische Einrichtung
WO2001039229A1 (fr) * 1999-11-25 2001-05-31 Siemens Aktiengesellschaft Dispositif a deux contacteurs couples en serie
DE19954460A1 (de) * 1999-11-12 2001-09-20 Pilz Gmbh & Co Sicherheitsschaltgerät zum Ein- und sicheren Ausschalten eines elektrischen Verbrauchers, insbesondere einer elektrisch angetriebenen Maschine
US6297569B1 (en) * 1998-12-31 2001-10-02 Honeywell International Inc. Power switching system
EP1262021B1 (fr) * 2000-03-08 2004-01-02 PILZ GmbH & CO. Appareil de commutation de securite et systeme d'appareils de commutation de securite

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4409541A1 (de) * 1994-03-19 1995-09-21 Leon Helma Christina Sicherheitstechnische Einrichtung
US6297569B1 (en) * 1998-12-31 2001-10-02 Honeywell International Inc. Power switching system
DE19954460A1 (de) * 1999-11-12 2001-09-20 Pilz Gmbh & Co Sicherheitsschaltgerät zum Ein- und sicheren Ausschalten eines elektrischen Verbrauchers, insbesondere einer elektrisch angetriebenen Maschine
WO2001039229A1 (fr) * 1999-11-25 2001-05-31 Siemens Aktiengesellschaft Dispositif a deux contacteurs couples en serie
EP1262021B1 (fr) * 2000-03-08 2004-01-02 PILZ GmbH & CO. Appareil de commutation de securite et systeme d'appareils de commutation de securite

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20160225563A1 (en) * 2015-02-02 2016-08-04 Omron Corporation Relay unit and method for controlling relay circuit
US10186390B2 (en) * 2015-02-02 2019-01-22 Omron Corporation Relay circuit for contact preservation and method for controlling relay circuit
CN108700863A (zh) * 2016-02-08 2018-10-23 菲尼克斯电气公司 安全开关设备
US11294345B2 (en) 2016-02-08 2022-04-05 Phoenix Contact Gmbh & Co. Kg Safety switching apparatus
WO2017207403A1 (fr) * 2016-05-30 2017-12-07 Pilz Gmbh & Co. Kg Dispositif de mise hors circuit sans erreur d'un consommateur
US11037747B2 (en) 2016-05-30 2021-06-15 Pilz Gmbh & Co. Kg Device for the fail-safe disconnection of a consumer

Also Published As

Publication number Publication date
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