EP2089892A1 - Safety switch device - Google Patents
Safety switch deviceInfo
- Publication number
- EP2089892A1 EP2089892A1 EP07846559A EP07846559A EP2089892A1 EP 2089892 A1 EP2089892 A1 EP 2089892A1 EP 07846559 A EP07846559 A EP 07846559A EP 07846559 A EP07846559 A EP 07846559A EP 2089892 A1 EP2089892 A1 EP 2089892A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- circuit
- safety
- switch device
- switching
- switching element
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
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
-
- 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
- H01H47/005—Safety control circuits therefor, e.g. chain of relays mutually monitoring each other
Definitions
- a monitoring contact can be used to determine whether the relay for the work circuit is working properly. If the normally open contacts are open, the monitoring contact must be closed. Regularly certified relays are used which guarantee that the normally open contacts are open when the monitoring contact is closed and vice versa. This makes it possible to achieve a required security level, eg 4.
- the invention is first of a
- Safety switch device for switching on and off a power supply of a load, which comprises at least one controllable switching element, in particular a relay and a safety circuit for checking a switching state of the switching element.
- the switching element is designed as a changeover switch, such that a first contact with either a second or third contact by a switching operation of the switch is electrically connected. By doing so, e.g. With a single relay, a load circuit and a safety circuit can be realized as separately operating circuits. Because a "switch" can ensure that either the safety circuit or the load circuit is closed. When the closed safety circuit is detected, the load circuit must be open.
- Safety circuit and load circuit take place. Because with the switch, both poles of a load circuit can be opened, whereas two poles of a safety circuit can be closed and vice versa, so that both circuits can be operated completely independently of each other.
- the respective second contact with the safety circuit and the respective third contact with the load is electrically connected.
- "normally closed" contacts of the safety circuit and the "normally open” contacts of the load can be assigned to the controllable switching elements connected in series.
- electrical decoupling means are provided to decouple the safety circuit from the power supply of the load, if the power supply is switched to the safety circuit.
- This can be realized, for example, via capacitances, whereby a high-pass effect can be achieved, which filters out DC components, eg, Y1 or Y2 become capacitors used.
- a transducer such as an optocoupler or a transformer or a transformer.
- At least two series circuits of at least two controllable switching elements are provided.
- series connection is preferably understood a series connection of switching contacts.
- a load can be switched via the respective series connection.
- a safety circuit is formed over each series connection of a plurality of series circuits.
- each series connection can be checked.
- each series connection is part of a separate safety circuit.
- an actuator in each case a controllable switching element of the first and second series circuit simultaneously.
- the described procedure has the advantage that the load circuit 101, 102 is completely disconnected from the safety circuit 103, 104 during normal operation. This is achieved by the switches 1, 2, 21, 22. It can be ensured that a test signal of the signal source 5 is never applied to the load circuit 101, 102. This can be done by the fact that the test signal of the signal source 5 is applied only when after known switching time of the relay 1, 2, 21, 22 of the switching operation is carried out safely.
- the four relays are controlled by four coils 31, 41. In each case two relay contact groups are thus connected to a common coil 31, 41.
- Each series connection of two relays is electrically connected to a monitoring circuit consisting of the driver 11 and the filter 10 and the protective elements 7 and 8 or an overvoltage protection 9.
- different test signals from the signal source 5 are fed.
- different filters 10 and more filters 10 may be used.
- a microcontroller is used for a current evaluation.
Landscapes
- Keying Circuit Devices (AREA)
- Relay Circuits (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102006053397A DE102006053397A1 (en) | 2006-11-10 | 2006-11-10 | Safety switching device |
PCT/EP2007/009762 WO2008055701A1 (en) | 2006-11-10 | 2007-11-12 | Safety switch device |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2089892A1 true EP2089892A1 (en) | 2009-08-19 |
EP2089892B1 EP2089892B1 (en) | 2013-05-01 |
Family
ID=39123885
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP20070846559 Active EP2089892B1 (en) | 2006-11-10 | 2007-11-12 | Safety switch device |
Country Status (6)
Country | Link |
---|---|
US (1) | US8035942B2 (en) |
EP (1) | EP2089892B1 (en) |
CN (1) | CN101578678B (en) |
DE (1) | DE102006053397A1 (en) |
DK (1) | DK2089892T3 (en) |
WO (1) | WO2008055701A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20190096611A1 (en) * | 2017-09-27 | 2019-03-28 | Rockwell Automation Switzerland Gmbh | Safety Switch |
Families Citing this family (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101746662B (en) * | 2008-12-17 | 2013-03-20 | 上海三菱电梯有限公司 | Escalator |
DE102010036838A1 (en) * | 2010-08-04 | 2012-02-09 | Schaefer Gmbh | Self-monitoring push-button switch and associated monitoring method |
TWI622548B (en) * | 2012-12-13 | 2018-05-01 | 伊文修股份有限公司 | Monitoring device for a transport installation for persons, trasnport installation for persons, and method of monitoring a transport installation for persons |
JP6229173B2 (en) * | 2013-09-30 | 2017-11-15 | パナソニックIpマネジメント株式会社 | Power switching device and storage battery system |
JP6390454B2 (en) * | 2015-02-02 | 2018-09-19 | オムロン株式会社 | Relay unit and control method of relay circuit |
JP6435891B2 (en) * | 2015-02-02 | 2018-12-12 | オムロン株式会社 | Relay unit, control method of relay unit |
JP6428323B2 (en) * | 2015-02-02 | 2018-11-28 | オムロン株式会社 | Relay unit, control method of relay unit |
JP6459573B2 (en) * | 2015-02-02 | 2019-01-30 | オムロン株式会社 | Relay unit |
DE102015104211A1 (en) * | 2015-03-20 | 2016-09-22 | Pilz Gmbh & Co. Kg | Safety switching device for fail-safe disconnection of an electrical load |
WO2017102025A1 (en) * | 2015-12-18 | 2017-06-22 | Pepperl+Fuchs Gmbh | Methods and apparatuses for monitoring the functionality of redundantly interconnected contacts |
EP3196913B1 (en) * | 2016-01-20 | 2019-04-10 | Schneider Electric Industries SAS | Relay circuit and method for performing self-test of relay circuit |
US11022651B2 (en) | 2017-03-02 | 2021-06-01 | Vacon Oy | Arrangement and method for a safe turn off |
US10475612B2 (en) | 2017-04-27 | 2019-11-12 | Rockwell Automation Asia Pacific Business Center, Pte. Ltd. | Electrical relay system with failure detection |
EP3557598B1 (en) * | 2018-04-20 | 2020-10-28 | EUCHNER GmbH + Co. KG | Safety switch |
Family Cites Families (18)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3571800A (en) * | 1967-09-15 | 1971-03-23 | Nasa | Plural position switch status and operativeness checker |
US4045714A (en) * | 1974-07-31 | 1977-08-30 | Macleod Donald A | Remote switch control and status indicator system |
US4028498A (en) * | 1974-10-07 | 1977-06-07 | Solid State Systems, Inc. | Private automatic branch exchange system and apparatus |
DE2729480A1 (en) | 1977-06-30 | 1979-01-11 | Kloeckner Humboldt Deutz Ag | Non-reactive monitor for switchgear contacts - has series connection of HF relay, oscillator and filter in parallel with switch contact for potential-free signalling |
DE3642233C2 (en) * | 1986-12-10 | 1994-03-24 | Steuerungselektronik Schoefman | Self-monitoring device for relay contacts |
US5065104A (en) * | 1987-02-17 | 1991-11-12 | Alexander Kusko | Fault sensing with an artificial reference potential provided by an isolated capacitance effect |
GB2203907A (en) | 1987-03-09 | 1988-10-26 | Qualcast Garden Prod | Testing residual current circuit breakers |
ATE81569T1 (en) * | 1987-07-15 | 1992-10-15 | Philips Corp | ELECTRIC SHOCK PROTECTION CIRCUIT WITH ELECTRIC LOCK FOR SMALL APPLIANCE. |
US4916628A (en) * | 1988-07-08 | 1990-04-10 | Commonwealth Edison Company | Microprocessor-based control/status monitoring arrangement |
DE3909613A1 (en) * | 1989-03-23 | 1990-09-27 | Hans Turck Gmbh & Co Kg | Circuit arrangement for self-monitoring of a switching device for a load circuit |
EP0681310B1 (en) | 1993-11-19 | 2000-06-14 | The Nippon Signal Co. Ltd. | Load driving circuit |
US5612994A (en) * | 1995-02-22 | 1997-03-18 | Chen; Jhy-Ping | Interphone system |
EP1202313A1 (en) | 2000-10-23 | 2002-05-02 | Safecom Ag | Device for safety engineering to supervise the switching position of mechanical contacts |
DE10325363A1 (en) * | 2003-05-23 | 2005-01-13 | Pilz Gmbh & Co. | Safety switching device for fail-safe disconnection of an electrical consumer and corresponding method |
EP1484780A1 (en) * | 2003-06-03 | 2004-12-08 | Siemens Aktiengesellschaft | Drive control device for safety-critical components and corresponding method |
DE10360199A1 (en) * | 2003-12-20 | 2005-07-21 | Robert Bosch Gmbh | Secured control device |
US7208955B2 (en) * | 2005-03-15 | 2007-04-24 | Network Appliance, Inc. | Power relay or switch contact tester |
US7446437B2 (en) * | 2005-07-22 | 2008-11-04 | American Power Conversion Corporation | Apparatus and method for preventing an electrical backfeed |
-
2006
- 2006-11-10 DE DE102006053397A patent/DE102006053397A1/en not_active Withdrawn
-
2007
- 2007-11-12 WO PCT/EP2007/009762 patent/WO2008055701A1/en active Application Filing
- 2007-11-12 CN CN2007800495619A patent/CN101578678B/en active Active
- 2007-11-12 EP EP20070846559 patent/EP2089892B1/en active Active
- 2007-11-12 DK DK07846559T patent/DK2089892T3/en active
-
2009
- 2009-05-07 US US12/436,865 patent/US8035942B2/en active Active
Non-Patent Citations (1)
Title |
---|
See references of WO2008055701A1 * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20190096611A1 (en) * | 2017-09-27 | 2019-03-28 | Rockwell Automation Switzerland Gmbh | Safety Switch |
Also Published As
Publication number | Publication date |
---|---|
EP2089892B1 (en) | 2013-05-01 |
US8035942B2 (en) | 2011-10-11 |
CN101578678B (en) | 2012-08-15 |
CN101578678A (en) | 2009-11-11 |
DE102006053397A1 (en) | 2008-05-15 |
WO2008055701A1 (en) | 2008-05-15 |
DK2089892T3 (en) | 2013-07-29 |
US20090251835A1 (en) | 2009-10-08 |
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