EP0776017A2 - Device for the reliable and permanent connection of a contact pair of an electromechanical switching device - Google Patents

Device for the reliable and permanent connection of a contact pair of an electromechanical switching device Download PDF

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Publication number
EP0776017A2
EP0776017A2 EP96250265A EP96250265A EP0776017A2 EP 0776017 A2 EP0776017 A2 EP 0776017A2 EP 96250265 A EP96250265 A EP 96250265A EP 96250265 A EP96250265 A EP 96250265A EP 0776017 A2 EP0776017 A2 EP 0776017A2
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Prior art keywords
evaluation circuit
switch contact
input
contact device
operating voltage
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EP96250265A
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German (de)
French (fr)
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EP0776017A3 (en
Inventor
Andreas Kruschinski
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Vodafone GmbH
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Mannesmann AG
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/60—Auxiliary means structurally associated with the switch for cleaning or lubricating contact-making surfaces
    • H01H1/605—Cleaning of contact-making surfaces by relatively high voltage pulses

Definitions

  • the invention relates to an arrangement for the permanently reliable connection of a contact set of an electromechanical switch contact device to an input of a power-limited evaluation circuit for binary information.
  • Such contact sets of electromechanical switch contact devices belong systematically to the group of binary sensors.
  • Sensor or actuator is directly connected to a processing device designed as a user-specific integrated circuit, so-called ASIC (applicant specific integrated circuit), which is accommodated in an SMD housing (surface mounted device) and has an evaluation circuit for sensors and a driver circuit for actuators .
  • ASIC appliance specific integrated circuit
  • the power supply for each connected actuator / sensor is limited to 5 mA for thermal reasons, as is known from the technical device pass for the ASI module upper part 3RG9001-0AG00 from Siemens.
  • the limited current strength means that, in particular in the case of contact sets of electromechanical switch contact devices acting as sensors, such as those used as robust limit switches in mechanical engineering facilities, the self-cleaning effect does not occur in the absence of sufficient current strength, so that after a short operating time the contact transmission resistance between the Contacts of a contact set increases to such an extent that it is no longer possible to clearly identify whether the contacts are open or closed.
  • the invention is therefore based on the object of improving an arrangement with a contact set, acting as a sensor, of an electromechanical switch contact device on an ASI evaluation circuit in such a way that permanent operational reliability is ensured.
  • the essence of the invention is to impress the contact set of the electromechanical switch contact device with a current that is independent of the ASI evaluation circuit and that can be adapted to the special properties of the switch contact device.
  • a previously known, available ASI evaluation circuit with a predetermined current limitation can also be used in connection with switching contact devices which require a minimum current for self-cleaning, which is above the current limitation of the ASI evaluation circuit.
  • FIG. 1 a basic circuit diagram is shown in Figure 1 with the switching means essential to the invention.
  • An evaluation circuit 1 is connected to a first operating voltage connection 2 and a second operating voltage connection 3 and has an input 11 and an output 12.
  • An operating voltage source not shown, is connected to the first and second operating voltage connections 2 and 3.
  • a switch contact device 4 is shown, which has a switchable contact set, the switching state of monitor is.
  • the state of the contact set of the switch contact device 4 can be tapped as a logic level at the output 12 of the evaluation circuit 1.
  • This switch contact device is designed as a limit switch in mechanical engineering devices.
  • the set of contacts of the switch contact device 4 to be monitored is connected between the first operating voltage connection 2 and the input 11 of the evaluation circuit 1.
  • a current source 5 is also provided, which is connected in series with the contact set of the switching contact device 4 between the first operating voltage connection 2 and the second operating voltage connection 3.
  • the current source is connected between the input 11 of the evaluation circuit 1 and the second operating voltage connection 3.
  • a current flows through the contact set, which is additively composed of the input current of the evaluation circuit 1 at the input 11 and the current through the current source 5.
  • the input current of the evaluation circuit 1 at the input 11 is limited by the system.
  • the source current of the current source 5 is adjustable so that the total current through the contact set of the switch contact device 4 in the closed state at least reaches the known and required for the specially used switch contact to achieve the self-cleaning effect.
  • the potential at the input 11 of the evaluation circuit 1 is substantially equal to the potential at the second operating voltage connection 3, so that the current source 5 has no effect on the evaluation circuit 1.
  • the advantage of the invention can be seen in particular in the fact that the complex design of a special evaluation circuit 1 for the actuator-sensor interface ASI for special properties of switch contact devices 4 is avoided.

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  • Keying Circuit Devices (AREA)

Abstract

Die Erfindung betrifft eine Anordnung zur dauerhaft betriebssicheren Anschaltung eines Kontaktsatzes einer elektromechanischen Schaltkontakteinrichtung an einen Eingang einer leistungsaufnahmebegrenzten Auswerteschaltung für binäre Informationen. Dazu wird vorgeschlagen, eine Stromquelle (5) in Reihe zu dem Kontaktsatz der elektromechanischen Schaltkontakteinrichtung (4) und zwischen den Eingang (11) der Auswerteschaltung (1) und einem zweiten Betriebsspannungsanschluß (3) zu schalten.

Figure imgaf001
The invention relates to an arrangement for the permanently reliable connection of a contact set of an electromechanical switch contact device to an input of a power-limited evaluation circuit for binary information. It is proposed to connect a current source (5) in series with the contact set of the electromechanical switch contact device (4) and between the input (11) of the evaluation circuit (1) and a second operating voltage connection (3).
Figure imgaf001

Description

Die Erfindung betrifft eine Anordnung zur dauerhaft betriebssicheren Anschaltung eines Kontaktsatzes einer elektromechanischen Schaltkontakteinrichtung an einen Eingang einer leistungsaufnahmebegrenzten Auswerteschaltung für binäre Informationen.The invention relates to an arrangement for the permanently reliable connection of a contact set of an electromechanical switch contact device to an input of a power-limited evaluation circuit for binary information.

Derartige Kontaktsätze von elektromechanischen Schaltkontakteinrichtungen gehören systematisch der Gruppe der binäre Sensoren an. Zur Vernetzung derartiger binärer Sensoren in der Feldebene ist aus dem Beitrag

Figure imgb0001
Binäre Sensoren am Bus - Mit ASI eine durchgängige Datenübertragung bis zum einfachen Sensor" in Elektronik Nr. 12/1994, Seiten 64 bis 68, bekannt, über das sogenannte Aktuator-Sensor-Interface, kurz ASI genannt, binäre Informationen auszutauschen. Dabei wird der Sensor oder Aktuator direkt an eine als anwenderspezifische integrierte Schaltung, sogenanntes ASIC (applicant specific integrated circuit), die in einem SMD-Gehäuse (surface mounted device) untergebracht ist, ausgeführte Verarbeitungseinrichtung, die für Sensoren eine Auswerteschaltung und für Aktuatoren eine Treiberschaltung aufweist, angeschlossen.Such contact sets of electromechanical switch contact devices belong systematically to the group of binary sensors. For the networking of such binary sensors in the field level is from the article
Figure imgb0001
Binary sensors on the bus - With ASI, continuous data transmission down to the simple sensor "in electronics no. 12/1994, pages 64 to 68, is known, via the so-called actuator sensor interface, ASI for short, to exchange binary information Sensor or actuator is directly connected to a processing device designed as a user-specific integrated circuit, so-called ASIC (applicant specific integrated circuit), which is accommodated in an SMD housing (surface mounted device) and has an evaluation circuit for sensors and a driver circuit for actuators .

Aufgrund der geringen Oberfläche des SMD-Gehäuses ist aus thermischen Gründen, wie aus dem Technischen Gerätepaß für das ASI-Moduloberteil 3RG9001-0AG00 der Firma Siemens bekannt, die Stromversorgung für jeden angeschlossenen Aktuator/Sensor auf 5 mA begrenzt.Due to the small surface area of the SMD housing, the power supply for each connected actuator / sensor is limited to 5 mA for thermal reasons, as is known from the technical device pass for the ASI module upper part 3RG9001-0AG00 from Siemens.

Die begrenzte Stromstärke hat zur Folge, daß insbesondere bei den als Sensor wirkenden Kontaktsätzen von elektromechanischen Schaltkontakteinrichtungen, wie sie beispielsweise als robuste Endlagenschalter in Einrichtungen des Maschinenbaus eingesetzt werden, in Ermangelung ausreichender Stromstärke der Selbstreinigungseffekt ausbleibt, so daß bereits nach kurzer Betriebsdauer der Kontaktübertragungswiderstand zwischen den Kontakten eines Kontaktsatzes so weit steigt, daß eine eindeutige Identifizierung, ob die Kontakte geöffnet oder geschlossen sind, nicht mehr möglich ist.The limited current strength means that, in particular in the case of contact sets of electromechanical switch contact devices acting as sensors, such as those used as robust limit switches in mechanical engineering facilities, the self-cleaning effect does not occur in the absence of sufficient current strength, so that after a short operating time the contact transmission resistance between the Contacts of a contact set increases to such an extent that it is no longer possible to clearly identify whether the contacts are open or closed.

Der Erfindung liegt daher die Aufgabe zugrunde, eine Anordnung mit einem als Sensor wirkenden Kontaktsatz einer elektromechanischen Schaltkontakteinrichtung an einer ASI-Auswerteschaltung so zu verbessern, daß eine dauerhafte Betriebssicherheit gewährleistet ist.The invention is therefore based on the object of improving an arrangement with a contact set, acting as a sensor, of an electromechanical switch contact device on an ASI evaluation circuit in such a way that permanent operational reliability is ensured.

Erfindungsgemäß wird diese Aufgabe mit den Mitteln des Patentanspruchs 1 gelöst. Eine vorteilhafte Ausgestaltung der Erfindung ist in dem Patentanspruch 2 beschrieben.According to the invention, this object is achieved with the means of claim 1. An advantageous embodiment of the invention is described in claim 2.

Das Wesen der Erfindung besteht darin, dem Kontaktsatz der elektromechanischen Schaltkontakteinrichtung einen von der ASI-Auswerteschaltung unabhängigen Strom aufzuprägen, der an die speziellen Eigenschaften der Schaltkontakteinrichtung anpaßbar ist. Vorteilhafterweise ist dadurch eine vorbekannte, verfügbare ASI-Auswerteschaltung mit vorgegebener Strombegrenzung auch in Zusammenschaltung mit Schaltkontakteinrichtungen, die zur Selbstreinigung einer Mindeststromstärke bedürfen, die oberhalb der Strombegrenzung der ASI-Auswerteschaltung liegt, verwendbar.The essence of the invention is to impress the contact set of the electromechanical switch contact device with a current that is independent of the ASI evaluation circuit and that can be adapted to the special properties of the switch contact device. Advantageously, a previously known, available ASI evaluation circuit with a predetermined current limitation can also be used in connection with switching contact devices which require a minimum current for self-cleaning, which is above the current limitation of the ASI evaluation circuit.

Die Erfindung wird nachstehend anhand eines Ausführungsbeispiels näher erläutert. Dazu ist in Figur 1 ein Prinzipschaltbild mit den erfindungswesentlichen Schaltmitteln dargestellt. Eine Auswerteschaltung 1 ist an einen ersten Betriebsspannungsanschluß 2 und einen zweiten Betriebsspannungsanschluß 3 angeschlossen und weist einen Eingang 11 und einen Ausgang 12 auf. An den ersten und den zweiten Betriebsspannungsanschluß 2 und 3 ist eine nicht dargestellte Betriebsspannungsquelle angeschlossen. Weiterhin ist eine Schaltkontakteinrichtung 4 dargestellt, die einen schaltbaren Kontaktsatz aufweist, dessen Schaltzustand zu überwachen ist. Der Zustand des Kontaktsatzes der Schaltkontakteinrichtung 4 ist als logischer Pegel am Ausgang 12 der Auswerteschaltung 1 abgreifbar. Diese Schaltkontakteinrichtung ist als Endlagenschalter in Einrichtungen des Maschinenbaus ausgeführt. Der zu überwachende Kontaktsatz der Schaltkontakteinrichtung 4 ist zwischen den ersten Betriebsspannungsanschluß 2 und den Eingang 11 der Auswerteschaltung 1 geschaltet.The invention is explained in more detail below using an exemplary embodiment. For this purpose, a basic circuit diagram is shown in Figure 1 with the switching means essential to the invention. An evaluation circuit 1 is connected to a first operating voltage connection 2 and a second operating voltage connection 3 and has an input 11 and an output 12. An operating voltage source, not shown, is connected to the first and second operating voltage connections 2 and 3. Furthermore, a switch contact device 4 is shown, which has a switchable contact set, the switching state of monitor is. The state of the contact set of the switch contact device 4 can be tapped as a logic level at the output 12 of the evaluation circuit 1. This switch contact device is designed as a limit switch in mechanical engineering devices. The set of contacts of the switch contact device 4 to be monitored is connected between the first operating voltage connection 2 and the input 11 of the evaluation circuit 1.

Erfindungsgemäß ist darüber hinaus eine Stromquelle 5 vorgesehen, die in Reihe mit dem Kontaktsatz der Schaltkontakteinrichtung 4 zwischen den ersten Betriebsspannungsanschluß 2 und den zweiten Betriebsspannungsanschluß 3 geschaltet ist. In der dargestellten Ausführungsform ist die Stromquelle zwischen den Eingang 11 der Auswerteschaltung 1 und den zweiten Betriebsspannungsanschluß 3 geschaltet.According to the invention, a current source 5 is also provided, which is connected in series with the contact set of the switching contact device 4 between the first operating voltage connection 2 and the second operating voltage connection 3. In the embodiment shown, the current source is connected between the input 11 of the evaluation circuit 1 and the second operating voltage connection 3.

Bei geschlossenem Kontaktsatz der Schaltkontakteinrichtung 4 wird der Kontaktsatz von einem Strom durchflossen, der sich additiv aus dem Eingangsstrom der Auswerteschaltung 1 am Eingang 11 und dem Strom durch die Stromquelle 5 zusammensetzt. Der Eingangsstrom der Auswerteschaltung 1 am Eingang 11 ist systembedingt vorgegeben begrenzt. Der Quellenstrom der Stromquelle 5 ist so einstellbar, daß der Summenstrom durch den Kontaktsatz der Schaltkontakteinrichtung 4 im geschlossenen Zustand den für den speziell eingesetzten Schaltkontakt erforderlichen und bekannten Strom zur Erzielung des Selbstreinigungseffektes mindestens erreicht. Durch Realisierung des für sich bekannten Selbstreinigungseffektes der Kontakte des Kontaktsatzes auch für Schaltkontakteinrichtungen 4, bei denen der zur Selbstreinigung erforderliche Mindeststrom größer als der vorgegebene, maximale Strom der Auswerteschaltung 1 ist, wird auch für diese Spezies von Schaltkontakteinrichtungen 4 eine dauerhafte Betriebssicherheit an ASI-Auswerteschaltungen darstellbar.When the contact set of the switching contact device 4 is closed, a current flows through the contact set, which is additively composed of the input current of the evaluation circuit 1 at the input 11 and the current through the current source 5. The input current of the evaluation circuit 1 at the input 11 is limited by the system. The source current of the current source 5 is adjustable so that the total current through the contact set of the switch contact device 4 in the closed state at least reaches the known and required for the specially used switch contact to achieve the self-cleaning effect. By realizing the known self-cleaning effect of the contacts of the contact set also for switch contact devices 4, in which the minimum current required for self-cleaning is greater than the predetermined maximum current of the evaluation circuit 1, permanent reliability of ASI evaluation circuits is also achieved for these species of switch contact devices 4 representable.

Im geöffneten Zustand des Kontaktsatzes der Schaltkontakteinrichtung 4 ist das Potential am Eingang 11 der Auswerteschaltung 1 im wesentlichen gleich dem Potential am zweiten Betriebsspannungsanschluß 3, so daß die Stromquelle 5 gegenüber der Auswerteschaltung 1 wirkungslos ist.In the opened state of the contact set of the switch contact device 4, the potential at the input 11 of the evaluation circuit 1 is substantially equal to the potential at the second operating voltage connection 3, so that the current source 5 has no effect on the evaluation circuit 1.

Der Vorteil der Erfindung ist insbesondere darin zu sehen, daß die aufwendige Gestaltung einer besonderen Auswerteschaltung 1 für das Aktuator-Sensor-Interface ASI für spezielle Eigenschaften von Schaltkontakteinrichtungen 4 vermieden wird.The advantage of the invention can be seen in particular in the fact that the complex design of a special evaluation circuit 1 for the actuator-sensor interface ASI for special properties of switch contact devices 4 is avoided.

Claims (2)

Anordnung zur dauerhaft betriebssicheren Anschaltung eines Kontaktsatzes einer elektromechanischen Schaltkontakteinrichtung an eine leistungsaufnahmebegrenzte Auswerteschaltung für binäre Informationen nach dem Aktuator-Sensor-Interface ASI, wobei die Schaltkontakteinrichtung zwischen einen ersten Betriebsspannungsanschluß und den Eingang der Auswerteschaltung geschaltet ist,
dadurch gekennzeichnet,
daß eine Stromquelle (5) in Reihe zu dem Kontaktsatz der elektromechanischen Schaltkontakteinrichtung (4) und zwischen den Eingang (11) der Auswerteschaltung (1) und einem zweiten Betriebsspannungsanschluß (3) geschaltet ist.Arrangement for the permanently reliable connection of a contact set of an electromechanical switch contact device to a power-limited evaluation circuit for binary information according to the actuator sensor interface ASI, the switch contact device being connected between a first operating voltage connection and the input of the evaluation circuit,
characterized by
that a current source (5) is connected in series with the contact set of the electromechanical switch contact device (4) and between the input (11) of the evaluation circuit (1) and a second operating voltage connection (3). Anordnung nach Anspruch 1
dadurch gekennzeichnet,
daß die Stromquelle (5) durch einen ohmschen Widerstand gebildet ist.Arrangement according to claim 1
characterized by
that the current source (5) is formed by an ohmic resistor.
EP96250265A 1995-11-24 1996-11-21 Device for the reliable and permanent connection of a contact pair of an electromechanical switching device Withdrawn EP0776017A3 (en)

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Application Number Priority Date Filing Date Title
DE1995145254 DE19545254C2 (en) 1995-11-24 1995-11-24 Arrangement for the permanently reliable connection of a contact set of an electromechanical switch contact device
DE19545254 1995-11-24

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EP0776017A2 true EP0776017A2 (en) 1997-05-28
EP0776017A3 EP0776017A3 (en) 1998-07-29

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2016073004A (en) * 2014-09-26 2016-05-09 三菱電機株式会社 Protective relay device

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012207592A1 (en) * 2012-05-08 2013-11-14 Robert Bosch Gmbh Circuit arrangement has control unit that detects switching state of relay, which is arranged such that relay is actuated several times by control device upon detection of break contact when relay is closed
DE102015016992B4 (en) 2015-12-24 2017-09-28 Audi Ag Method for cleaning electrical contacts of an electrical switching device and motor vehicle

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1154554B (en) * 1962-02-23 1963-09-19 Licentia Gmbh Arrangement for achieving reliable contact with a mechanical contact arrangement
DE3228686A1 (en) * 1982-07-31 1984-02-02 Edmund 7016 Gerlingen Zottnik Method and device for detecting switch positions
DE4015271A1 (en) * 1990-05-12 1991-11-14 Vdo Schindling CIRCUIT ARRANGEMENT FOR INQUIRING SWITCH POSITIONS
DE4318188A1 (en) * 1993-06-01 1994-12-08 Abb Management Ag Device for monitoring a switch position

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2016073004A (en) * 2014-09-26 2016-05-09 三菱電機株式会社 Protective relay device

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EP0776017A3 (en) 1998-07-29
DE19545254C2 (en) 2000-09-07
DE19545254A1 (en) 1997-05-28

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