EP2826052A1 - Circuit à relais de sécurité - Google Patents

Circuit à relais de sécurité

Info

Publication number
EP2826052A1
EP2826052A1 EP13709093.2A EP13709093A EP2826052A1 EP 2826052 A1 EP2826052 A1 EP 2826052A1 EP 13709093 A EP13709093 A EP 13709093A EP 2826052 A1 EP2826052 A1 EP 2826052A1
Authority
EP
European Patent Office
Prior art keywords
circuit
relay
state
switch
detection means
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
Application number
EP13709093.2A
Other languages
German (de)
English (en)
Other versions
EP2826052B1 (fr
Inventor
Fabian Zink
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Phoenix Contact GmbH and Co KG
Original Assignee
Phoenix Contact GmbH and 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 Phoenix Contact GmbH and Co KG filed Critical Phoenix Contact GmbH and Co KG
Publication of EP2826052A1 publication Critical patent/EP2826052A1/fr
Application granted granted Critical
Publication of EP2826052B1 publication Critical patent/EP2826052B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/16—Indicators for switching condition, e.g. "on" or "off"
    • H01H9/161—Indicators for switching condition, e.g. "on" or "off" comprising light emitting elements
    • 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 invention relates to a circuit arrangement for switching a load circuit in safety technology, with error states of the relay to be detected.
  • electromagnetic relays are preferably used.
  • the open position of a load circuit electromagnetic relays are preferably used.
  • Relay switch take its open position, which is detectable, but if it is by a foreign body or by metal break a bridge between the
  • the invention has for its object to provide a safety relay circuit, in which
  • Error states can be reliably detected at the relay switch.
  • a monitoring circuit which the command input to an electromechanical relay with a relay switch position or the
  • the relay switch of two relays in the load circuit are connected in parallel with each other in the invention.
  • the other relay switch causes the current path to close to the load.
  • it must be required that faults are detected, even if they do not immediately lead to a faulty circuit, because the fault in one of the relay switches is cured by the correct operation of the other relay switch.
  • Relay switch is a display circuit is provided, however, is able to detect disturbances due to erroneous bridging at the relevant relay switch by current detection means.
  • Display circuit on a light emitting diode which is operated via an associated auxiliary power source.
  • Terminal contact points of the faulty relay switch are electrically connected to each other, then the associated LED lights up due to operation through the Auxiliary voltage source and it is possible to turn off the load circuit by switching the non-faulted relay. This can be done within one
  • a fault in the switch-off safety relay circuit can also when the load circuit is de-energized
  • Monitor circuit welded should be or if one of the relay switch a "three-point contact bridging" sets, then this is when interrogating the display circuit due
  • the load current can possibly lead to an overload of the current detection means, which can be averted by a fuse ("polyfuse").
  • FIG. 4 in fault state II (three-point contact bridging)
  • FIG. 5 in fault state III (two-point contact bridging)
  • Fig. 7 is a schematic representation of
  • Fig. 12 is a schematic representation of
  • FIGS. 1 to 5 which is a
  • the safety circuit comprises a load circuit LN between the terminals L and N, which can be switched on and off by a relay Kl, a display circuit AI, the
  • Circuit arrangement as a whole rated as "error-free” or as "faulty".
  • the relay Kl has as electromechanical relay a switch tongue kl, which switches between a closing point Sl and a ⁇ ffnerddling oil and is connected to a common point Gl.
  • the display circuit AI comprises an auxiliary power source Hl and current detection means in the form of a light emitting diode LED1 and is connected to the switching points Gl and oil. Depending on the position of the switch kl, the light emitting diode LED1 is in operation or out of operation.
  • the switched-on state of the light-emitting diode is indicated by arrows, while in the switched-off state the arrows are omitted.
  • the evaluation circuit comprises an integrated circuit IC1 which can make logic operations in such a way that two similar input signals give an output signal "error-free", which is represented here by a "0", and two dissimilar input signals to the
  • Output of an error signal leads, which is symbolized here by a "1."
  • the integrated circuit IC1 As input signal to the integrated circuit IC1 on the one hand the command input to the relay Kl and on the other hand the signal of an opto-coupler is used, the signal of the LED LED1 in a
  • the optocoupler consists of a circuit with switching transistor Ql, by the light of the
  • LED LED1 is switched on and otherwise switched off.
  • a resistor in series with the transistor Ql and a tap leads the signal of the optocoupler to the integrated circuit IC1 of the evaluation circuit.
  • Fig. 1 shows the error-free state of
  • Display circuit AI turned on.
  • the LED LED1 lights up and turns on the transistor Ql, so the opto-coupler outputs the signal "0", which corresponds to the command signal "0" to the relay K1.
  • Integrated circuit ICl then outputs the error-free signal "0".
  • Fig. 2 shows the active state
  • Load circuit LN turns on and the display circuit AI turns off.
  • the optocoupler receives no
  • Fig. 3 shows a fault condition I, which can be characterized by suspended or welded contacts.
  • This fault condition I occurs when switching off the relay Kl and means that the relay is no longer safe. Because of the faulty position of the switching edge kl the diode LED1 does not light in the display circuit AI, so that the optocoupler outputs the signal "1" to the integrated circuit ICl, which detects the inconsistency between the command input to the relay Kl and the reaction of the display circuit AI and as error signal "1" outputs.
  • Fig. 4 shows a fault condition II, which may be referred to as "three-point contact bridging", because the
  • a fault condition III is outlined, which consists in a kind of two-point contact bridging.
  • the LED LED1 receives an overcurrent, which by a (not shown)
  • the circuit arrangement shown in Fig. 6 may be referred to as a safety relay with optical diagnosis.
  • the circuit comprises two electromagnetic relays K1 and K2 of a simpler, conventional design, connected in parallel to a control source, not shown, so that the relay coils are energized or de-energized. It is also possible to control the relays K1 and K2 through separate control circuits.
  • the relays K1 and K2 each have associated switches kl and k2, which have a
  • Excitation state of the relay coils can take.
  • the relay switches kl and k2 close a load circuit extending between the terminals L and N.
  • Each relay switch kl, k2 is associated with a display circuit AI or A2, which the
  • Relay switch kl in the illustrated rest position bridges the otherwise open display circuit AI to two (Gl, oil) of the three terminal contact points (Sl, Gl, oil) of the relay Kl and in the same way connects the switch k2 the corresponding terminal -Contact points (S2, G2, 02) of the relay K2 to close the second display circuit Ü2.
  • the relay switches kl and k2 are switched from their illustrated rest position (Fig. 7) to the operative position (Fig. 8), the display circuits AI and A2 are opened and the load circuit LN is closed.
  • H2 can be any kind of
  • the transformer forms a first transformer Tl as a first auxiliary voltage source Hl and a second transformer T2 as a second auxiliary voltage source H2.
  • Primary winding is subjected to voltage pulses to the respective auxiliary voltage sources Hl, H2 intermittently to be effective and to query the respective state of the display circuits AI, A2.
  • Fig. 7 shows a schematic diagram of the switch-off safety relay circuit in the idle state.
  • Connection contact points are indicated with Sl, Gl and oil resp. S2, G2 and 02.
  • the first relay switch kl closes the first display circuit AI between the contact points G1 and oil and the second relay switch S2 closes the second display circuit A2 between the contact points G2 and 02.
  • Arrows in the LEDs LED1 and LED2 indicate the light state of these diodes. If both diodes are fully lit, there is no fault condition in the currentless circuit of the load circuit, as has been explained with Fig. 1.
  • Fig. 8 shows the turn-off safety relay circuit in its active state in which the load circuit LN is turned on.
  • the switch kl connects the
  • the first display circuit AI is left open and the LED LED1 does not light up.
  • This error state I can be detected, as explained in detail with FIG. 3.
  • the discrepancy between the lighting states of LED1 and LED2 can be detected as an error.
  • the renewed restart of the load circuit can be prevented.
  • Display circuit AI in this fault is lit while LED2 of indicator circuit A2 goes out. When this error occurs, the load circuit should be de-energized immediately. immediate
  • Fig. 11 shows a fault state III ("two-point contact override") in which by breaking a
  • the described circuit arrangement thus comprises a monitoring circuit having display circuits AI, A2 and evaluation circuits according to FIGS. 1 to 5.
  • the evaluation circuits AI, A2 associated with integrated circuits can be combined with each other and additionally contain a further logic circuit integrated with the positions of the relay switch kl, k2 and the response states of the LEDs LED1, LED2
  • FIG. 6 is modified in such a way that the switches k1, k2 lie parallel to one another in the load circuit LN, as is also apparent from FIGS. 12 and 13. Therefore, if one of the switches kl or k2 should fail, the other switch can make sure that the
  • Fig. 12 shows the sleep state of the turn-on safety relay circuit
  • Fig. 13 shows the active state thereof. At rest, both LEDs light up LEDl and LED 2 of the two display circuits AI and A2, and in the active state of the switch-on
  • the error state I at the relay Kl in snagging the switch kl at a contact point (here oil). This can be determined according to the monitoring method as described in FIG. Alternatively or additionally, the error state I ("Hanging
  • fault state II (three-point contact override)
  • all three terminal contact points Sl, Gl, oil of the relay K1 have electrical contact with each other, which can be detected as described in Fig. 4.
  • the fault condition II can be detected when the relay K1 is energized , because the light states of the light-emitting diodes LED1 and LED2 differ, and in error state III ("two-point contact override") there is a bridging between the two
  • Connection contact points Sl and oil The can be determined according to the method of FIG. 5.
  • the two described methods of fault detection are suitably combined with each other in the monitoring circuit, the control positions of the relay switches kl and k2 and the response states of the diodes LED1 and LED2 are logically linked together to detect the fault conditions at the respective relay switches kl, k2.
  • Monitoring circuit the two display circuits AI, A2 and associated evaluation circuits and

Landscapes

  • Relay Circuits (AREA)
  • Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
  • Testing Electric Properties And Detecting Electric Faults (AREA)

Abstract

L'invention concerne un circuit à relais de sécurité, comprenant en particulier deux relais commutateurs (k1, k2) montés en série ou en parallèle dans un circuit de courant de charge (LN). Au relais commutateur (k1) est associé un circuit électrique d'affichage de position de commutateur (A1). Un montage d'évaluation compare l'entrée d'une commande vers le relais (k1) à l'affichage du circuit électrique d'affichage (A1), ce qui permet d'identifier des anomalies survenant sur les relais commutateurs.
EP13709093.2A 2012-03-13 2013-03-12 Circuit à relais de sécurité Active EP2826052B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102012004843A DE102012004843A1 (de) 2012-03-13 2012-03-13 Sicherheitsrelaisschaltung
PCT/EP2013/055029 WO2013135719A1 (fr) 2012-03-13 2013-03-12 Circuit à relais de sécurité

Publications (2)

Publication Number Publication Date
EP2826052A1 true EP2826052A1 (fr) 2015-01-21
EP2826052B1 EP2826052B1 (fr) 2017-01-04

Family

ID=47878030

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13709093.2A Active EP2826052B1 (fr) 2012-03-13 2013-03-12 Circuit à relais de sécurité

Country Status (4)

Country Link
US (1) US20150016007A1 (fr)
EP (1) EP2826052B1 (fr)
DE (1) DE102012004843A1 (fr)
WO (1) WO2013135719A1 (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106291203B (zh) * 2016-09-26 2023-05-02 深圳供电局有限公司 一种10kV永磁机构模拟断路器
FR3063189B1 (fr) * 2017-02-17 2019-06-07 Schneider Electric Industries Sas Procede de controle d'un inverseur de sources et inverseur de sources mettant en oeuvre un tel procede
CN107559229B (zh) * 2017-09-04 2023-10-31 山西潞安环保能源开发股份有限公司王庄煤矿 掘进工作面局扇风机远距离集中监控装置
DE102018217135A1 (de) * 2018-10-08 2019-10-17 Heidelberger Druckmaschinen Ag Potentialfreie Kontaktüberwachungsvorrichtung zur Erfassung des Öffnungszustands eines Schalters
DE102018129899A1 (de) * 2018-11-27 2020-05-28 Pilz Gmbh & Co. Kg Schaltgerät zum gezielten Einschalten und/oder Ausschalten eines elektrischen Verbrauchers, insbesondere zum fehlersicheren Abschalten einer gefährlichen Maschinenanlage
EP3835799B1 (fr) * 2019-12-10 2023-07-26 Schneider Electric Industries SAS Agencement de circuit pour applications de sécurité
JP7095016B2 (ja) * 2020-04-17 2022-07-04 富士電機株式会社 電力変換装置
CN114844491A (zh) * 2021-02-01 2022-08-02 漳州立达信光电子科技有限公司 一种单火线智能开关及单火线多控开关

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DE9107193U1 (fr) * 1991-06-11 1991-08-14 Bosch-Siemens Hausgeraete Gmbh, 8000 Muenchen, De
DE69909620T2 (de) * 1998-05-20 2004-04-15 The Foxboro Co., Foxboro Selbstüberprüfendes ausgangsmodul
JP2001282301A (ja) * 2000-04-03 2001-10-12 Matsushita Electric Ind Co Ltd ロボットの制御装置
EP1202313A1 (fr) 2000-10-23 2002-05-02 Safecom Ag Dispositif de sécurité pour surveiller la position des pièces de contact mécanique
EP2290776A1 (fr) * 2009-03-23 2011-03-02 Abb Ag Relais de surcharge thermique avec fonctions de protection basées sur la tension
JP5319400B2 (ja) * 2009-05-28 2013-10-16 アズビル株式会社 リレー異常検出装置
US8624601B2 (en) * 2010-10-04 2014-01-07 Enerdel, Inc. System and method for determining physical status of switch elements
TWI422136B (zh) * 2010-10-08 2014-01-01 Ind Tech Res Inst 應用於太陽光電交流模組直流轉交流換器之電路模組

Non-Patent Citations (1)

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Title
See references of WO2013135719A1 *

Also Published As

Publication number Publication date
WO2013135719A1 (fr) 2013-09-19
EP2826052B1 (fr) 2017-01-04
DE102012004843A1 (de) 2013-09-19
US20150016007A1 (en) 2015-01-15

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