EP1232507B1 - Configuration comprising two contactors connected in series - Google Patents
Configuration comprising two contactors connected in series Download PDFInfo
- Publication number
- EP1232507B1 EP1232507B1 EP00987151A EP00987151A EP1232507B1 EP 1232507 B1 EP1232507 B1 EP 1232507B1 EP 00987151 A EP00987151 A EP 00987151A EP 00987151 A EP00987151 A EP 00987151A EP 1232507 B1 EP1232507 B1 EP 1232507B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- series
- switching
- contacts
- contactor
- signals
- 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
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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 invention relates to an arrangement with at least two contactors whose switching contacts are connected in series and which are each driven by a trigger signal.
- the trigger signals for the two contactors are usually set such that always one of the two contacts is turned off first, so that this contact is subject to a particularly high contact erosion. As a result, this contact must already be replaced, while the other contact is practically unused.
- the invention is therefore an object of the invention to provide an arrangement of the type mentioned above, which ensures a longer life in terms of Maisabbrands.
- the inventive arrangement according to the figure has two contactors Sa, Sb, the switching contacts a and b are connected in series.
- the triggering signals which are supplied to the shooters Sa and Sb, respectively, in order to effect the switching on and off of the contacts a and b, are given the reference numerals 1 and 2, respectively.
- the triggering signals 1, 2 are preferably generated in a control unit 3 in this way in that a time offset .DELTA.t specifically exists between them in order to make switch-ons Eai, Ebi of the two contactors Sa, Sb in each case before the other contactor.
- a random number generator 4 To form the time-shifted trigger signals 1, 2 by the control unit 3, a random number generator 4, a fixed generator 5 as indicated in the figure or means with similar properties can be used.
- a further switching contact c of the third contactor Sc is connected in series to the two switching contacts a, b of the contactors Sa, Sb, which is controlled by the switching signal 6 generated in the control unit 3.
- the switching signal 6 also has a time offset .DELTA.t to the two other switching signals 1, 2, however, is changed according to the above conditions to distribute the contact erosion due to switching off and switching practically evenly on all three contactors Sa, Sb, Sc. In this way, the overall life of the arrangement is increased.
Landscapes
- Keying Circuit Devices (AREA)
- Relay Circuits (AREA)
Description
Die Erfindung betrifft eine Anordnung mit mindestens zwei Schützen, deren Schaltkontakte in Reihe geschaltet sind und die jeweils durch ein Auslösesignal angesteuert werden.The invention relates to an arrangement with at least two contactors whose switching contacts are connected in series and which are each driven by a trigger signal.
Bei gattungsgemäßen Anordnungen werden die Auslösesignale für die beiden Schütze üblicherweise derart vorgegeben, daß stets einer der beiden Kontakte zuerst ausgeschaltet wird, so daß dieser Kontakt einem besonders hohen Kontaktabbrand unterliegt. Dies führt dazu, daß dieser Kontakt bereits ausgetauscht werden muß, während der andere Kontakt praktisch ungebraucht ist.In generic arrangements, the trigger signals for the two contactors are usually set such that always one of the two contacts is turned off first, so that this contact is subject to a particularly high contact erosion. As a result, this contact must already be replaced, while the other contact is practically unused.
Dokument EP 116 987 erwähnt eine ähnliche Problematik.Document EP 116 987 mentions a similar problem.
Der Erfindung liegt daher die Aufgabe zugrunde, eine Anordnung der oben genannten Art zu schaffen, die hinsichtlich des Kontaktabbrands eine längere Lebensdauer gewährleistet.The invention is therefore an object of the invention to provide an arrangement of the type mentioned above, which ensures a longer life in terms of Kontaktabbrands.
Die Aufgabe wird dadurch gelöst, daß die Auslösesignale für die Ausschaltungen der Schaltkontakte solchermaßen mit einem Zeitversatz Δt generiert werden, daß für die zeitlich an erster Stelle vorgenommenen Ausschaltungen Aai bzw. Abi der beiden Schaltkontakte a bzw. b die Gleichung
erfüllt ist.The object is achieved in that the triggering signals for the switching off of the switching contacts are generated in such a way with a time offset .DELTA.t that for the time made in the first place cutouts Aai and Abi of the two switching contacts a and b, the equation
is satisfied.
Die durch die Gleichung gegebene Bedingung gilt für einen längeren Einsatz der Anordnung mit einer größeren Anzahl von Schaltungen n. Unter dieser Voraussetzung wird erreicht, daß der Kontaktabbrand an beiden in Reihe geschalteten Schaltkontakten nach einer Vielzahl von Ausschaltungen nahezu etwa gleich ist, wodurch die Lebensdauer gegenüber der bekannten Anordnung verdoppelt ist.The condition given by the equation applies to a longer use of the arrangement with a larger number of circuits n. Under this condition, it is achieved that the contact erosion at both series-connected switch contacts after a plurality of cut-offs is approximately approximately is the same, whereby the life compared to the known arrangement is doubled.
Vorteilhafte Weiterbildungen der Erfindung sind den Unteransprüchen 2 bis 4 zu entnehmen.Advantageous developments of the invention can be taken from the
Ein Ausführungsbeispiel der Erfindung wird im folgenden anhand einer Zeichnung näher erläutert.An embodiment of the invention will be explained in more detail below with reference to a drawing.
Die erfindungsgemäße Anordnung gemäß der Figur weist zwei Schütze Sa, Sb auf, deren Schaltkontakte a bzw. b in Reihe geschaltet sind. Die Auslösesignale, die den Schützen Sa bzw. Sb zugeführt werden, um davon abhängig die Ein- und Ausschaltung der Kontakte a bzw. b zu bewirken tragen die Bezugsziffern 1 bzw. 2. Die Auslösesignale 1, 2 werden vorzugsweise in einem Steuerwerk 3 derart generiert, daß zwischen ihnen gezielt ein Zeitversatz Δt besteht, um Einschaltungen Eai, Ebi der beiden Schütze Sa, Sb jeweils vor dem anderen Schütz vorzunehmen. Entsprechendes gilt für die Ausschaltungen Aai, Abi, die zeitlich an erster Stelle des Schützes Sa oder Sb vor dem jeweils anderen Schütz getätigt werden. Das Steuerwerk 3 generiert die Auslösesignale 1, 2 dermaßen, daß zumindest folgende Gleichung erfüllt ist:
Dies bedeutet, daß über einen längeren Zeitraum die Summe i=1...n von Ausschaltungen Aai des Schützes Sa ungefähr gleich ist der Summe i=1...n der Ausschaltungen Abi des Schützes Sb.This means that over a longer period of time the sum i = 1... N of cut-outs Aai of the contactor Sa is approximately equal to the sum i = 1... N of the cut-offs Abi of the contactor Sb.
Auf diese Weise wird erreicht, daß der Kontaktabbrand aufgrund der Ausschaltungen, insbesondere bei Überlastströmen und Kurzschlußströmen, bei den beiden Kontakten a, b etwa gleich ist, was eine höhere Lebensdauer der Anordnung in Bezug auf den Kontaktabbruch zur Folge hat.In this way it is achieved that the contact erosion due to the shutdowns, especially in overload currents and short-circuit currents, in the two contacts a, b is about the same, which has a longer life of the arrangement in relation to the contact abatement result.
Darüber hinaus kann das Steuerwerk, wie bereits oben angedeutet, derart ausgebildet sein, daß die zeitlich an erster Stelle vorgenommenen Einschaltungen folgender Gleichung genügen:
Dies bedeutet, daß die Summe i=1...n der Einschaltungen Eai des Schützes Sa ungefähr gleich ist der Summe i=1...n der Einschaltungen Ebi des Schützes Sb.This means that the sum i = 1... N of the inputs Eai of the contactor Sa is approximately equal to the sum i = 1... N of the inputs Ebi of the contactor Sb.
Zur Bildung der zeitversetzten Auslösesignale 1, 2 durch das Steuerwerk 3 kann ein Zufallsgenerator 4, ein Festgenerator 5. wie in der Figur angedeutet oder Mittel mit ähnlichen Eigenschaften eingesetzt werden.To form the time-shifted
Gemäß der Figur ist zu den beiden Schaltkontakten a, b der Schütze Sa, Sb ein weiterer Schaltkontakt c des dritten Schützes Sc in Reihe geschaltet, das von dem im Steuerwerk 3 generierten Schaltsignal 6 angesteuert wird. Das Schaltsignal 6 hat dabei ebenso einen Zeitversatz Δt zu den beiden anderen Schaltsignalen 1, 2, der allerdings entsprechend den oben genannten Bedingungen verändert wird, um den Kontaktabbrand aufgrund von Ausschaltungen und Einschaltung praktisch gleichmäßig auf alle drei Schütze Sa, Sb, Sc zu verteilen. Auf diese Weise wird die Gesamtlebensdauer der Anordnung erhöht.According to the figure, a further switching contact c of the third contactor Sc is connected in series to the two switching contacts a, b of the contactors Sa, Sb, which is controlled by the
Claims (6)
- Arrangement having at least two contactors (Sa, Sb), whose switching contacts (a, b) are connected in series and which are each actuated by a tripping signal (1 or 2, respectively), characterized in that the tripping signals (1 and 2) for disconnection of the switching contacts (a, b) are generated with a time offset (Δt) such that the connection operations (Aai or Abi, respectively) which are carried out first are almost approximately equal at the two series-connected switching contacts (a, b) after a large number of connection operations.
- Arrangement according to Claim 1, characterized in that the tripping signals (1 and 2) for the connection operations of the contacts (a, b) are generated with a time offset (Δt) such that the connection operations (Eai or Ebi, respectively) which are carried out first are almost approximately equal at the two series-connected switching contacts (a, b) after a large number of connection operations.
- Arrangement according to Claim 1 or 2, characterized in that the tripping signals (1 and 2) are generated in a control mechanism (3).
- Arrangement according to Claim 3, characterized in that the tripping signals (1 and 2) are generated by means of a control mechanism (3) in conjunction with a random number generator (4).
- Arrangement according to one of the preceding claims, characterized in that at least one further switching contact (c) of a third contactor (Sc) is connected in series with the switching contacts (a, b), with the contactor (Sc) being actuated by a further switching signal (6) which has a time offset (Δt) with respect to the two other switching signals (1, 2) and the disconnection operations are almost approximately equal to the three series-connected switching contacts (a, b, c) after a large number of disconnection operations.
- Arrangement according to one of Claims 1 to 4, characterized in that at least one further switching contact (c) of a third contactor (5c) is connected in series with the switching contacts (a, b), with the contactor (Sc) being actuated by a further switching signal (6), which has a time offset (Δt) with respect to the two other switching signals (1, 2), and the connection operations are almost approximately equal to the three series-connected switching contacts (a, b, c) after a large number of connection operations.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19956698A DE19956698C1 (en) | 1999-11-25 | 1999-11-25 | Arrangement with two contactors in series |
DE19956698 | 1999-11-25 | ||
PCT/DE2000/004059 WO2001039229A1 (en) | 1999-11-25 | 2000-11-16 | Configuration comprising two contactors connected in series |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1232507A1 EP1232507A1 (en) | 2002-08-21 |
EP1232507B1 true EP1232507B1 (en) | 2007-01-24 |
Family
ID=7930275
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP00987151A Expired - Lifetime EP1232507B1 (en) | 1999-11-25 | 2000-11-16 | Configuration comprising two contactors connected in series |
Country Status (5)
Country | Link |
---|---|
US (1) | US6870723B1 (en) |
EP (1) | EP1232507B1 (en) |
JP (1) | JP2003515881A (en) |
DE (2) | DE19956698C1 (en) |
WO (1) | WO2001039229A1 (en) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102004033359A1 (en) * | 2004-07-01 | 2006-02-09 | Pilz Gmbh & Co. Kg | Device for the failsafe shutdown of an electrical load, in particular an electrically driven machine |
US8138625B2 (en) * | 2009-09-23 | 2012-03-20 | International Business Machines Corporation | Dual line active automatic transfer switch |
EP2461341A1 (en) * | 2010-12-06 | 2012-06-06 | Siemens Aktiengesellschaft | Error-proof switching module and method for operating same |
DE102012102220B4 (en) * | 2012-03-16 | 2017-05-11 | Phoenix Contact Gmbh & Co. Kg | Safety circuit and safety relay with a safety circuit |
JP6459573B2 (en) * | 2015-02-02 | 2019-01-30 | オムロン株式会社 | Relay unit |
DE102017102937B4 (en) | 2017-02-14 | 2022-05-19 | Lisa Dräxlmaier GmbH | Method and device for controlling two relays arranged in series |
EP3410458B1 (en) * | 2017-06-02 | 2019-05-22 | Sick AG | Modular safety relay circuit for the safe switching on and/or disconnecting of at least one machine |
Family Cites Families (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3912978A (en) * | 1973-03-30 | 1975-10-14 | Westinghouse Electric Corp | Power circuit including current limiting device for an electric vehicle |
SE396335B (en) * | 1975-12-10 | 1977-09-19 | Saab Scania Ab | DEVICE FOR AN AUTOMATIC VEHICLE CONTROL SYSTEM |
US4297740A (en) * | 1979-02-05 | 1981-10-27 | Westinghouse Electric Corp. | Protective relaying apparatus |
NL8300394A (en) * | 1983-02-03 | 1984-09-03 | Philips Nv | RADIATION DEVICE. |
DE3432476A1 (en) * | 1984-09-04 | 1986-03-13 | Siemens AG, 1000 Berlin und 8000 München | Switching contactor |
US4879443A (en) * | 1987-08-12 | 1989-11-07 | Clairol Incorporated | Waterproof switch assembly for electrical appliances |
DE58906550D1 (en) * | 1988-08-23 | 1994-02-10 | Inventio Ag | Method and device for generating shaft information in lifts. |
US5500582A (en) * | 1994-06-13 | 1996-03-19 | Owen; Donald W. | Multiphase load control system with switch connected split sources of phase voltage |
EP0767478B1 (en) * | 1995-10-04 | 1999-10-06 | Schneider Electric Gmbh | Safety circuit |
GB9603702D0 (en) * | 1996-02-21 | 1996-04-17 | Lucas Ind Plc | Contactor and controller for a contactor |
DE19722927C1 (en) * | 1997-05-27 | 1998-12-24 | Schleicher Relais | Switching device with in-built safety function for protecting personnel from injury due to moving machinery or plant |
US6304977B1 (en) * | 1997-10-07 | 2001-10-16 | Festo Ag & Co. | Field bus arrangement |
US6011327A (en) * | 1997-12-19 | 2000-01-04 | International Business Machines Corporation | AC transfer switch |
US6330176B1 (en) * | 2000-11-15 | 2001-12-11 | Powerware Corporation | Multi-input power transfer and uninterruptible power supply apparatus and methods of operation thereof |
-
1999
- 1999-11-25 DE DE19956698A patent/DE19956698C1/en not_active Expired - Fee Related
-
2000
- 2000-11-16 JP JP2001540804A patent/JP2003515881A/en not_active Withdrawn
- 2000-11-16 US US10/130,999 patent/US6870723B1/en not_active Expired - Fee Related
- 2000-11-16 EP EP00987151A patent/EP1232507B1/en not_active Expired - Lifetime
- 2000-11-16 WO PCT/DE2000/004059 patent/WO2001039229A1/en active IP Right Grant
- 2000-11-16 DE DE50014014T patent/DE50014014D1/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
US6870723B1 (en) | 2005-03-22 |
DE50014014D1 (en) | 2007-03-15 |
DE19956698C1 (en) | 2001-09-13 |
EP1232507A1 (en) | 2002-08-21 |
JP2003515881A (en) | 2003-05-07 |
WO2001039229A1 (en) | 2001-05-31 |
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