EP1652203B1 - Installation de protection adaptee a des circuits en cascade et procede correspondant permettant la realisation de connexions securisees - Google Patents
Installation de protection adaptee a des circuits en cascade et procede correspondant permettant la realisation de connexions securisees Download PDFInfo
- Publication number
- EP1652203B1 EP1652203B1 EP04741006A EP04741006A EP1652203B1 EP 1652203 B1 EP1652203 B1 EP 1652203B1 EP 04741006 A EP04741006 A EP 04741006A EP 04741006 A EP04741006 A EP 04741006A EP 1652203 B1 EP1652203 B1 EP 1652203B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- switch
- emergency stop
- electrical unit
- pulse
- protective
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 238000000034 method Methods 0.000 title claims description 14
- 230000001012 protector Effects 0.000 title 1
- 230000001681 protective effect Effects 0.000 claims description 34
- 230000004913 activation Effects 0.000 claims description 14
- 238000012544 monitoring process Methods 0.000 description 12
- 238000010586 diagram Methods 0.000 description 7
- 238000011156 evaluation Methods 0.000 description 6
- 230000035484 reaction time Effects 0.000 description 6
- 238000010276 construction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
Images
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
Definitions
- the present invention relates to a protective device for safety-related switching of an electrical unit having a first input for receiving a switch-off signal, a second input for receiving a switch-on signal in the form of a switch-on pulse and an output for driving the electrical unit. Moreover, the present invention relates to a corresponding method for safety-related switching of an electrical unit.
- an emergency stop button for switching the system or device may be provided.
- Shutdown is carried out by a safety or protective device.
- the protection device 1 which can also be referred to as an emergency stop device, has a multi-channel input via which it receives an emergency stop signal from an emergency stop button 2.
- the protective device 1 has a second input, via which a switch-on signal can be received by an on-push button 3.
- This button 3 is designed as a normal open button.
- the protection device 1 controls an actuator 4, e.g. a contactor.
- the actuator 4 in turn switches a load contact 5 and at the same time a monitoring contact 6. In the non-active state of the actuator 4, the load contact 5 is open and the monitoring contact 6 is closed.
- category 4 after an emergency stop on a safety device must not be automatically restarted after the emergency stop cause has been eliminated. This means that after pressing an emergency stop button, it must first be locked again for restarting. The device does not start up yet. First when a On button is pressed, the output (s) are enabled and the device starts up.
- a monitoring of the actuators must be given for category 4 of this safety standard EN 954, ie monitoring contacts 6 of the emergency stop device 1 or of the connected actuator 4 must be introduced into the on-button circuit. As a result, errors of the actuator 4 can be detected. If, for example, the load contact 5 of a contactor is welded due to an overload, then the monitoring contact 6 is open, even if the contactor is not activated. This means that the on-button circuit is interrupted and a restart is prevented.
- each circuit group corresponds to that of FIG. 1.
- the first emergency stop device 11 is connected to a two-channel emergency stop button 12, 12 '.
- This controls two actuators or contact multipliers 14 and 14 'in accordance with category 4 of the safety standard EN 954.
- the actuators 14 and 14 ' actuate monitoring contacts 16 and 16', which are connected in series and with an on-button 13 form a one-button circuit, for example, from an external supply voltage source (24 V) to the emergency stop device 11.
- this cascade circuit can be described as follows. If the emergency stop button 12, 12 'is actuated on the first emergency stop device 11, the actuators 14, 14' of the emergency stop device 11 are deactivated. Thus, the load contacts 15, 15 'of these actuators 14, 14', which are installed in the emergency stop circuit of the emergency stop device 21, are opened. This leads, as in the emergency stop circuit of the emergency stop device 11, to an interruption in the emergency stop circuit of the emergency stop device 21. This also causes the actuators 24 and 24 'of the emergency stop device 21 switched off. Consequently, all load circuits of the cascade are turned off.
- the emergency stop button 12, 12 'of the emergency stop device 11 is locked again, ie the emergency stop circuit is in a closed state. At this point, however, the load circuits are not yet closed. For this purpose, the ON button 13 and 23 must also be pressed become. If the ON button 23 on the emergency stop device 21 is first actuated, then the emergency stop device 21 does not switch its actuators 24, 24 'on, since the actuators 14, 14' of the emergency stop device 11 switch on Stop the emergency stop circuit of the emergency stop device 21. To restart the load circuits so the on-button 13 of the emergency stop device 11 must first be pressed. Thereafter, the actuators 14, 14 'of the emergency stop device 11 are activated and the emergency stop circuit of the emergency stop device 21 is closed. Only now, the emergency stop device 21 can be started by pressing its on-button 23. This means that a prescribed order must be observed for the operation of the ON button. However, such uncomfortable operation of systems are unsuitable for the practice.
- a similar safety switching device system is known from the document DE 100 11 211 A1.
- This safety relay system comprises two safety relays whose construction and function correspond to each other. The two devices are connected in series with the interposition of an emergency stop switch. In addition, a start switch is provided on both devices.
- the object of the present invention is thus to propose a protective device or protective system and a corresponding method for the safety-related shutdown of an electrical unit, with which the operation of complex systems is more comfortable.
- this object is achieved by a protective device for safety-related switching off an electrical unit having a first input for receiving a switch-off signal to a second input for receiving a switch-on signal in the form of a switch-on and an output for driving the electrical unit, and a pulse processing device for moving the protection device in an activation state in which it is in the absence of the Switch-off is switched on, for a predetermined period of time from the start of the switch-on.
- the invention provides a method for safety-related switching of an electrical unit by receiving a turn-off, turning off the electrical unit, receiving a turn-on signal in the form of a turn-on and turning on the electrical unit, wherein turning on the electrical unit after recording the switch-on pulse is only possible for a predefinable period of time.
- the turn-on signal comes from an on-button.
- the switch-off signal usually comes from a lockable emergency stop button.
- the closing of the emergency stop button can not be done unconsciously, which is of the utmost importance for safety technology.
- the electrical unit that is switched by the protection device may be an actuator and in particular a contactor. As a result, load circuits with higher currents can be switched easily.
- the inputs and outputs of the protection device should be multi-channel. This is mandatory for category 4 of the EN 954 standard and increases the safety standard.
- the falling or both edges of the switch-on pulse for displacing the protective device into the activation state can be evaluated by the pulse processing device.
- This edge sensitivity is also prescribed by the named safety standard, so that a cross-circuit does not cause an involuntary restart of the emergency stop device or protective device.
- the pulse processing device may comprise a timer which, after the switch-on pulse, provides an acknowledgment command for maintaining the activation state for a predetermined time.
- the protection device can be turned on as desired a certain time after the switch-on.
- reaction times of the individual devices with one another can thereby be taken into account.
- the activation state for the period of time is set to correspond to the activation time of at least one electrical unit and / or at least one further switching device.
- connection of protective devices according to the invention to a cascaded protection system is particularly advantageous.
- the first input of a second of the multiple protection devices is driven by the output of one of the multiple protection devices.
- the above-mentioned duration for the activation state is to be dimensioned for this purpose so that it is greater than the sum of the reaction times of all protection devices.
- This protection system can then be switched on with a common on-button, if the inputs of the several protection devices are connected accordingly.
- the units or systems connected by the protective devices can be switched on again comfortably after an emergency stop operation.
- the purpose of the following embodiment is, as mentioned, for example, a conveyor belt, on which several emergency stop button are mounted.
- the switching on of the conveyor belt after an emergency stop operation should only be performed by an authorized person.
- a central on-button on a control unit eg a control cabinet.
- Figure 3 a suitable security system with multiple emergency stop devices in cascade with a common on-button as a block diagram is shown.
- the construction is substantially similar to that of FIG. 2, so that reference is made to the description of FIG. 2 with regard to the same elements.
- the emergency stop devices 11 and 21 are configured in a known manner, a system realization according to category 4 (monitored start / restart) is not possible.
- the reason for this is that the one-button impulse arrives at the subordinate device 21 before the release (unlocking) of the emergency stop circuit 15, 22 or 15 ', 22' or the one-button circuit 26 'arrives. , 26, 16, 16 ', 33 is interrupted.
- the emergency stop button 12, 12 ' is locked again to turn on the system, i. closed, and the common on-button 33 is actuated (L-H-L pulse), so while the first emergency stop device 11 turns on, the second emergency stop device 21 can not turn on.
- the emergency stop circuit is still interrupted by the second emergency stop device 21, since the actuators of the emergency stop device 11 are only activated after a certain reaction time. Button impulse react.
- FIG. 4 shows a block diagram of the one-button evaluation according to the invention.
- a one-key signal is subjected to edge evaluation 40.
- edge evaluation 40 the falling or both edges of the switch-on pulse is evaluated in accordance with the required safety standard.
- a corresponding binary signal 401 is provided to a pulse processing device 41. This extends the switch-on pulse to a predetermined acknowledgment time by starting a timer. This results in an internal acknowledgment command 411 for the further safety logic, which for a certain time, e.g. 500 ms, is provided.
- This evaluation of the one-button pulse is carried out continuously, even if an emergency stop is present. If the emergency stop circuit is then closed within this acknowledgment time, the output is controlled via the safety logic and the device to be switched is switched on again.
- both emergency stop buttons 12, 12 'and 22, 22' are already closed to restart the device or the system.
- the on-button 33 is actuated, whereby the known from FIG 4 LHL pulse 401 is generated.
- the emergency stop device 11 switches on.
- the acknowledgment time is also started in the emergency stop device 21.
- the emergency stop device 21 detects a closed emergency stop circuit 22, 22', 15, 15 'and switches on the basis of the still present acknowledgment command also its actuators 24, 24 'on.
- the emergency stop device 11 does not switch its actuators 14, 14 'due to an error, then the emergency stop device 21 does not switch its actuators 24, 24' on, since then the emergency stop circuit 22, 22 ', 15, 15' of the second emergency stop device 21 is open.
- the internal acknowledgment command in the two emergency stop devices 11 and 21 is then cleared after the end of the acknowledgment time.
- the acknowledgment time must be selected in such a way that, for a desired cascading depth, the internal acknowledgment command still stands for the individual reaction or activation times of the actuators and emergency stop devices. This is easy to implement, especially in electrical emergency-stop devices, since their reaction times are low and thus the acknowledgment time can be small. On the other hand, if the acknowledgment time is specified in the emergency stop devices, only a certain cascading depth can be achieved, depending on the reaction times of the individual devices. Cascading depths that are too high are to be avoided, however, since the response time when switching off via the emergency stop button causes considerable delay due to cascading.
- Another advantage results from the fact that all monitoring contacts 16, 16 ', 26, 26' are connected in series. If there is an error in the subordinate emergency stop device 21 or its actuator 24, 24 ', then the higher-level emergency stop device 11 can not be switched on again.
Landscapes
- Safety Devices In Control Systems (AREA)
- Emergency Protection Circuit Devices (AREA)
Claims (19)
- Appareil de protection (11, 21) pour une coupure par sécurité d'une unité électrique, avec- une première entrée pour la réception d'un signal de coupure,- une deuxième entrée pour la réception d'un signal d'enclenchement sous la forme d'une impulsion d'enclenchement (401), et- une sortie pour la commande de l'unité électrique (14, 14', 24, 24'),caractérisé par un dispositif de traitement d'impulsion (41) pour mettre l'appareil de protection (11, 21), pour une durée prédéterminée à partir de la réception de l'impulsion d'enclenchement, dans un état d'activation dans lequel, en l'absence du signal de coupure, il est enclenché.
- Appareil de protection selon la revendication 1, dans lequel le signal d'enclenchement vient d'un bouton d'enclenchement (33).
- Appareil de protection selon la revendication 1 ou 2, dans lequel le signal de coupure vient d'un bouton de coupure d'urgence (12, 12', 22, 22') verrouillable.
- Appareil de protection selon l'une des revendications précédentes, dans lequel l'unité électrique (14, 14', 24, 24') est un actionneur et notamment un contacteur.
- Appareil de protection selon l'une des revendications précédentes, dans lequel les entrées et sorties sont à plusieurs voies.
- Appareil de protection selon l'une des revendications précédentes, dans lequel le dispositif de traitement d'impulsions (41) peut évaluer le front montant ou les deux fronts de l'impulsion d'enclenchement (401) pour mettre l'appareil de protection dans l'état d'activation.
- Appareil de protection selon l'une des revendications précédentes, dans lequel le dispositif de traitement d'impulsion (41) comporte un temporisateur qui, après l'impulsion d'enclenchement (401), pour un temps prédéterminé, fournit une instruction de confirmation pour la conservation de l'état d'activation.
- Appareil de protection selon l'une des revendications précédentes, dans lequel la durée prédéterminée pour l'état d'activation correspond au moins au temps d'activation de l'unité électrique (14, 14', 24, 24') et/ou d'un autre appareil de protection.
- Système de protection avec plusieurs appareils de protection (11, 21) selon l'une des revendications précédentes et branchés en cascade, la première entrée d'un deuxième appareil de protection parmi les appareils de protection (21) étant commandée par la sortie d'un premier appareil de protection parmi les appareils de protection (11).
- Système de protection selon la revendication 9, dans lequel les entrées des appareils de protection (11, 21) sont branchées avec un bouton d'enclenchement (33) commun.
- Procédé pour la commutation par sécurité d'une unité électrique (14, 14', 24, 24') par- réception d'un signal de coupure,- coupure de l'unité électrique (14, 14', 24, 24'),- réception d'un signal d'enclenchement sous la forme d'une impulsion d'enclenchement (401) et- enclenchement de l'unité électrique (14, 14', 24, 24'),caractérisé par le fait que- l'enclenchement de l'unité électrique (14, 14', 24, 24') est possible après la réception de l'impulsion d'enclenchement (401) pour une durée pouvant être prescrite, et est effectué en l'absence du signal de coupure.
- Procédé selon la revendication 11, dans lequel le signal d'enclenchement vient d'un bouton d'enclenchement (33).
- Procédé selon la revendication 11 ou 12, dans lequel le signal de coupure vient d'un bouton de coupure d'urgence (12, 12', 22, 22') verrouillable.
- Procédé selon l'une des revendications 11 à 13, dans lequel l'unité électrique (14, 14', 24, 24') est un actionneur et notamment un contacteur.
- Procédé selon l'une des revendications 11 à 14, dans lequel les signaux d'enclenchement et de coupure sont reçus sur plusieurs voies.
- Procédé selon l'une des revendications 11 à 15, dans lequel le front montant ou les deux fronts de l'impulsion d'enclenchement (401) sont évalués pour démarrer la durée pouvant être prescrite pendant laquelle l'enclenchement de l'unité électrique (14, 14', 24, 24') est possible.
- Procédé selon l'une des revendications 11 à 16, dans lequel la durée pouvant être prescrite pour l'enclenchement de l'unité électrique (14, 14', 24, 24') correspond au moins au temps d'activation de l'unité électrique (14, 14', 24, 24') et/ou d'un autre appareil de protection.
- Procédé pour la commutation par sécurité de plusieurs appareils de protection (11, 21) mis en cascade, dans lequel un deuxième appareil de protection parmi les appareils de protection (21) est commuté à l'aide d'un premier appareil de protection parmi les appareils de protection (11) selon l'une des revendications 11 à 17.
- Procédé selon la revendication 18, dans lequel le signal d'enclenchement est fourni simultanément à tous les appareils de protection (11, 21).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10336574 | 2003-08-08 | ||
PCT/EP2004/007797 WO2005017932A1 (fr) | 2003-08-08 | 2004-07-14 | Installation de protection adaptee a des circuits en cascade et procede correspondant permettant la realisation de connexions securisees |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1652203A1 EP1652203A1 (fr) | 2006-05-03 |
EP1652203B1 true EP1652203B1 (fr) | 2007-05-09 |
Family
ID=34177396
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP04741006A Expired - Lifetime EP1652203B1 (fr) | 2003-08-08 | 2004-07-14 | Installation de protection adaptee a des circuits en cascade et procede correspondant permettant la realisation de connexions securisees |
Country Status (5)
Country | Link |
---|---|
US (1) | US7579719B2 (fr) |
EP (1) | EP1652203B1 (fr) |
CN (1) | CN100514523C (fr) |
DE (1) | DE502004003785D1 (fr) |
WO (1) | WO2005017932A1 (fr) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102005014125A1 (de) * | 2005-03-22 | 2006-09-28 | Pilz Gmbh & Co. Kg | Sicherheitsschaltvorrichtung zum sicheren Abschalten eines elektrischen Verbrauchers |
DE102015116899A1 (de) * | 2015-10-05 | 2017-04-06 | Sick Ag | Sicherheitsschalterkaskade |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19715098B4 (de) | 1997-04-11 | 2004-12-23 | Schneider Electric Gmbh | Überwachungsschaltung |
DE19750958C2 (de) | 1997-05-15 | 2000-09-14 | Elan Schaltelemente Gmbh & Co | Schaltungsanordnung zur manuellen oder automatischen Steuerung von zumindest einem Freigabepfad |
US6037857A (en) | 1997-06-06 | 2000-03-14 | Allen-Bradley Company, Llc | Serial data isolator industrial control system providing intrinsically safe operation |
DE19954460C2 (de) * | 1999-11-12 | 2002-02-28 | Pilz Gmbh & Co | Sicherheitsschaltgerät zum Ein- und sicheren Ausschalten eines elektrischen Verbrauchers, insbesondere einer elektrisch angetriebenen Maschine |
DE10001735B4 (de) * | 2000-01-17 | 2006-07-06 | Pilz Gmbh & Co. Kg | Schutzvorrichtung gegen unerwünschte Inbetriebnahme einer Maschinenanlage |
DE10009707A1 (de) * | 2000-02-29 | 2001-09-06 | Pilz Gmbh & Co | Sicherheitsschaltvorrichtung mit einem ersten und einem zweiten Eingangsschalter |
DE10011211B4 (de) * | 2000-03-08 | 2004-08-05 | Pilz Gmbh & Co. | Sicherheitsschaltgerät und Sicherheitsschaltgeräte-System |
DE10045651B4 (de) | 2000-09-15 | 2007-08-02 | Pilz Gmbh & Co. Kg | Sicherheitsschaltgerät |
US6882155B2 (en) * | 2001-04-19 | 2005-04-19 | Vince J Lazzaro | Remotely actuated, circuit testing emergency stop apparatus and method |
-
2004
- 2004-07-14 WO PCT/EP2004/007797 patent/WO2005017932A1/fr active IP Right Grant
- 2004-07-14 CN CNB2004800221009A patent/CN100514523C/zh not_active Expired - Fee Related
- 2004-07-14 DE DE502004003785T patent/DE502004003785D1/de not_active Expired - Lifetime
- 2004-07-14 US US10/567,563 patent/US7579719B2/en active Active
- 2004-07-14 EP EP04741006A patent/EP1652203B1/fr not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
WO2005017932A1 (fr) | 2005-02-24 |
US20060232899A1 (en) | 2006-10-19 |
DE502004003785D1 (de) | 2007-06-21 |
US7579719B2 (en) | 2009-08-25 |
CN1830047A (zh) | 2006-09-06 |
EP1652203A1 (fr) | 2006-05-03 |
CN100514523C (zh) | 2009-07-15 |
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