EP0495388B1 - Sicherheitsschaltgerät - Google Patents

Sicherheitsschaltgerät Download PDF

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Publication number
EP0495388B1
EP0495388B1 EP92100230A EP92100230A EP0495388B1 EP 0495388 B1 EP0495388 B1 EP 0495388B1 EP 92100230 A EP92100230 A EP 92100230A EP 92100230 A EP92100230 A EP 92100230A EP 0495388 B1 EP0495388 B1 EP 0495388B1
Authority
EP
European Patent Office
Prior art keywords
contacts
control unit
safety control
unit according
supply voltage
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
Application number
EP92100230A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0495388A1 (de
Inventor
Peter Harsani
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.)
Pilz GmbH and Co KG
Original Assignee
Pilz 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 Pilz GmbH and Co KG filed Critical Pilz GmbH and Co KG
Publication of EP0495388A1 publication Critical patent/EP0495388A1/de
Application granted granted Critical
Publication of EP0495388B1 publication Critical patent/EP0495388B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • H01H47/005—Safety control circuits therefor, e.g. chain of relays mutually monitoring each other

Definitions

  • the invention relates to a safety switching device known from practice with the features of the preamble of claim 1.
  • Examples of such different operating modes are the one- or two-channel operation of a switching device, the determination of whether a time-controlled relay is to operate with delayed onset or dropout and the like. More.
  • devices are usually provided on the safety switching device, on which the operating mode can be set.
  • Connectors can be provided as devices for determining the choice of operation, into which a plug-in module with bridges is to be inserted. The bridges realize an electrical connection of different contacts of the connector. Certain connections must be made for each intended operating mode.
  • the very simple method of inserting plug-in modules into a socket strip provided for this purpose on a safety switching device also entails the risk that dirt particles, metal chips and the like get into the socket strip and short-circuit adjacent contacts.
  • a contact surface provided on this contact surface can bridge adjacent contacts of the socket strip.
  • the device just does not perform the desired function.
  • a faulty establishment of electrical connections that program the operating mode of the device can trigger incorrect tripping of the connected devices and thus cause hazards.
  • a connector strip with contacts connected to the electrical circuit is provided for setting and selecting different operating modes.
  • a plug-in module can be plugged into the connector strip in different positions so that operating modes coding bridges are placed between selected contacts of the connector strip.
  • a further contact, which has a potential different from the potential of the bridged contacts, is arranged in each case between two contacts to be connected with a bridge. Both the bridged contacts and the intermediate contact are each connected to one pole of the supply voltage with low resistance.
  • the number of contacts on the socket strip is kept low by nesting contacts that are to be connected by bridges at different potentials.
  • the arrangement is then such that two or more are connected by means of a bridge connecting contacts at least one is connected with a low resistance to a pole of the supply voltage.
  • the supply voltage is applied to the safety switching device via a fuse. If there is a short circuit, the safety relay can only be switched on after the fuse has been replaced.
  • Operation is particularly simple if an element with a current-limiting property, preferably a PTC resistor, is used instead of the fuse. There is no need to replace the element after a short circuit. After removal of the same, the safety switching device is immediately ready for operation again.
  • an element with a current-limiting property preferably a PTC resistor
  • a convenient embodiment is obtained by the arrangement of light-emitting diodes that indicate the selected operating mode. These light-emitting diodes are supplied with current via bridges which are arranged in the manner described above. An operating mode is assigned to each LED. If the supply voltage has collapsed due to a short circuit, no LED lights up. This means that the fault condition is immediately recognizable.
  • the electrical circuit 1 shows a safety switching device 3 consisting of an electrical circuit 1 and a socket strip 2 connected to it for setting the operating mode.
  • the electrical circuit 1 has an initialization channel 6 connected between a fuse 4 connected to a supply voltage and a line 5 carrying a ground potential , which consists of the series connection of a manual switch 7, two normally closed contacts 8 and 9 and a parallel connection of a relay 10 and a capacitor 11.
  • Two further channels 12 and 13 are connected in parallel to the initialization channel 6.
  • the channel 12 consists of the series connection of a normally closed contact 14 of an emergency stop button 15, the parallel connection of a normally open contact 17 belonging to the relay 16 also connected in series in the channel and the normally open contact 18 belonging to the relay 10.
  • the channel 13 contains a series connection of a normally closed contact 19 of the emergency stop button 15 and a parallel connection of a normally open contact 21 belonging to a relay 20 and one having a normally open contact 22 belonging to the relay 10.
  • the normally closed contacts 8 and 9 located in the initialization channel are associated with the relays 16 and 20. All relays 10, 16 and 20 have normally closed contacts 23 or normally open contacts 24 and 25, which are located in a current-carrying branch to a machine or system (not shown in FIG. 1).
  • the channels 12 and 13 are interrupted at points 26 and 27 and electrically connected to the socket strip 2.
  • the socket strip 2 carries contacts 28a ... 28m and is designed in its shape to match the corresponding operating modes plug-in modules 29, 30.
  • the plug-in module 29, 30 is designed as a printed circuit board on which the bridges 31, 32 and 33 encoding the different operating modes are applied as conductor tracks.
  • the contacts 28 are in direct contact with correspondingly prepared contact surfaces 32a, 32b, 31a, 31b or 33a, 33b, 33c.
  • the plug-in module 29 is inserted into the socket strip 2 with the contacts 28.
  • the safety stop device 3 is initially in the idle state, being connected to the supply voltage via the fuse 4 and the line 5. If the manual switch 7 located in the initialization channel 6 is closed, a current flows via the normally closed contacts 8 and 9, which charges the capacitor 11 and causes the relay 10 to attract.
  • the normally open contacts 18 and 22 of the relay 10 close, so that a current begins to flow in the channels 12 and 13 and thus in the relays 16 and 20, respectively.
  • the current flows in the channel 12 from the closed contact of the button 15 via the contact 28a of the socket strip 2, the bridge 32, the contact 28c and furthermore via the normally open contact 18 and the relay 16.
  • the current is initially via the closed contact 19, then via the contact 28e, the bridge 31, the contact 28g and further via the closed normally open contact 22 and the relay 20.
  • the relays 16 and 20 located in the channels 12 and 13 attract and thus open the normally closed contacts 8 and 9.
  • the initialization channel 6 is thus interrupted, the relay 10 is still a certain time out of the capacitor 11, which is sufficient to let the relays 16 and 20 go into latching fashion via the normally open contacts 17 and 21 powered. It drops out with a time delay, with a sufficient holding time being ensured by adequate dimensioning of the capacitor 11. Relays 16 and 20 are thus attracted and relay 10 has dropped out.
  • the safety switching device 3 is in single-channel operation.
  • the channel 12 is bridged by the part of the bridge 33 lying between the contact surfaces 33a and 33b on the contacts 28a and 28c and via the part of the bridge 33 lying between the contact surfaces 33b and 33c via the contact 28g with the working contacts belonging to the channel 13 21 and 22 and the relay 20 connected.
  • the normally closed contact 19 of the button 15 connected to the contact 28e is no longer connected and remains without function.
  • the safety switching device 3 is thus in single-channel operation.
  • the operation of the circuit 1 when switching on and off is similar to that described above, the only difference is that the channel currents of the channels 12 and 13 are brought together via the bridge 33 and switched together by the normally closed contact 14 of the button 15.
  • the contacts 28a ... 28h of the plug connector strip are alternately at a high and a low potential. The difference corresponds to the supply voltage. If an electrically conductive particle, such as a metal chip or a piece of wire, has accidentally fallen into the connector, there is a short circuit between two adjacent contacts 28 of the socket strip 2. If, for example, the contacts 28a and 28b are connected, the supply voltage of the safety switching device 3 is based on the fuse over the normally closed contact 14, the contacts 28a and 28b shorted to the line 5. Overlaps the one caused by the conductive particle Connection of several contacts 28, the supply voltage is also short-circuited.
  • the supply voltage is also short-circuited.
  • a plug-in module 29 or 30 should have been inserted obliquely, so that the contact surfaces of the plug-in module 29, 30 lead to a short circuit, for example between contact 28a and 28b of the socket strip 2.
  • the fuse 4 melts and interrupts the power supply to the safety switching device 3.
  • the circuit 1 can therefore no longer be initialized, malfunctions are therefore excluded. Only by eliminating the cause of the short circuit and renewing the fuse 4 is the circuit 1 ready for operation again when fully functional. Due to the low-impedance potentials which alternate along the socket strip 2 at the contacts 28, the supply voltage is also short-circuited when the other immediately adjacent contacts 28 are connected, and the fuse 4 then responds.
  • the fuse 4 can also be replaced by a PTC resistor or other current-limiting means. Even then, a short circuit on the socket strip 2 leads to a short circuit of the supply voltage and thus to a permanent blocking of the safety switching device 3. Thus, malfunctions are also excluded, but there is the advantage that the power supply of the safety switching device 3 automatically after eliminating the cause of the short circuit on the socket strip 2 is guaranteed again without the fuse 4 having to be replaced.
  • FIG. 2 shows an exemplary embodiment which is suitable both for single-channel operation and for two-channel operation with cross-circuit detection.
  • the Channel 12 connected to the contacts 28a and 28c of the socket strip 2.
  • the channel 13 is designed differently from the previous exemplary embodiment: the normally closed contact 19 of the button 15 is connected at one end to the line 5 and at the other end to the contact 28h of the socket strip 2.
  • the parallel connection of the working contacts 21 and 22 is connected at one end to the contact 28f of the socket strip 2 and at the other end to the relay 20, which in turn is connected to the contact 28e of the socket strip 2.
  • Supply voltage is present at contact 28g of socket strip 2.
  • the circuit for channel 12 is closed via bridge 32.
  • the channel 13 is closed via the bridge 37 and connected to the supply voltage via the bridge 31.
  • the basic mode of operation of the safety switching device 3 corresponds to that of the exemplary embodiment according to FIG. 1, but an essential difference is that when the safety switching device 3 is switched on, the current in channel 13 flows in the opposite direction to the current in channel 12.
  • This measure leads to an electrically conductive connection being established between the two poles of the supply voltage in the event of cross-circuits occurring due to external influences on the lines belonging to the channels 12 and 13.
  • the point 26 is connected to the supply voltage via the normally closed contact 14 and the fuse 4.
  • the point 27 is located on the line 5 via the normally closed contact 19. This results in a short circuit which leads to the melting of the fuse 4 and thus to the switching off of the safety device 3. Switching on the safety switching device 3 is reliably prevented. If a cross-circuit occurs at any other point between the channels 12 and 13, the supply voltage is also short-circuited in the manner described above and tripping of the fuse. 4. Cable faults which result in cross-circuits are thus recognized and malfunction of the circuit 1 is avoided.
  • contacts 28a to 28h on the socket bar 2 alternate constantly with the voltage-carrying and mass-conducting contacts.
  • the supply voltage is short-circuited and the safety switching device 3 is switched to the off state.
  • the safety switching device 3 When the plug-in module 36 is plugged in, the safety switching device 3 is in single-channel operation. Starting from the normally closed contact 14, the series connection of the parallel connection of the contacts 17 and 18 and the relay 16 is supplied with current via a branch of the bridge 33 and the contacts 28a and 28c. The relay 20 is connected to the normally closed contact 14 via the contact 28e and the bridge 33. On the other hand, the relay 20 is connected to the line 5 via the parallel connection of the working contacts 21 and 22 and the contact 28f and the bridge 38. Because the relays 16 and 20 as well as the working contacts 17 and 18 or 21 and 22 connected in series with them have current flowing through them in the opposite direction, this type of circuit with an inserted plug-in module 36 also provides protection against cross-circuits in the manner described above.
  • Each connection between the channel parts of the channels 12 and 13 leads to a supply voltage short circuit and thus to the melting of the fuse 4, as a result of which the circuit 1 is switched off or cannot be switched on at all.
  • Even when the plug-in module 36 is plugged in contacts with either supply voltage potential or ground potential alternate on the socket strip 2 from contact 28a to contact 28h.
  • Accidental connection of adjacent contacts 28 by falling into the female connector 2 metal parts or by Plug-in modules accidentally inserted at wrong angles therefore always lead to a short circuit in the supply voltage and to the safety switching device 3 being switched to the off state.
  • a display of the selected operating mode is realized by the exemplary embodiment according to FIG. 3.
  • two display elements 40 and 41 designed as LEDs are provided. These are interconnected on the cathode side and connected to line 5 with a common resistor 42.
  • the light-emitting diodes are not connected to contacts 28l and 28n. depending on the plug-in module 47 or 48 inserted, either the LED 41 is connected via the bridge 45 to the contact 28i connected to the supply voltage or the LED 40 is connected via the contact 28l and the bridge 46 to the contact 28i.
  • only one of the light-emitting diodes 40, 41 consequently receives current, so that only one of these light-emitting diodes lights up and thus indicates the desired operating mode.
  • the contact 28m located between the contacts 28l and 28n connected to the light-emitting diodes and the contact 28k located between the contact 28i connected to the supply voltage and the contact 28l connected to the light-emitting diode 40 are connected to the line 5.
  • a short circuit between contacts 28n and 28m has an analogous effect when plug-in module 48 is inserted. This short-circuit is initially of no significance and does not lead to any impairment, but if plug-in module 48 is exchanged for plug-in module 47, this leads to a short circuit and thus to the transfer of Safety switching device 3 in the off state.

Landscapes

  • Details Of Connecting Devices For Male And Female Coupling (AREA)
  • Keying Circuit Devices (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
  • Air Bags (AREA)
  • Control Of Combustion (AREA)
  • Fuses (AREA)
  • Cookers (AREA)
  • Push-Button Switches (AREA)
EP92100230A 1991-01-17 1992-01-09 Sicherheitsschaltgerät Expired - Lifetime EP0495388B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4101209A DE4101209A1 (de) 1991-01-17 1991-01-17 Sicherheitsschaltgeraet
DE4101209 1991-01-17

Publications (2)

Publication Number Publication Date
EP0495388A1 EP0495388A1 (de) 1992-07-22
EP0495388B1 true EP0495388B1 (de) 1995-11-15

Family

ID=6423168

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92100230A Expired - Lifetime EP0495388B1 (de) 1991-01-17 1992-01-09 Sicherheitsschaltgerät

Country Status (6)

Country Link
EP (1) EP0495388B1 (enrdf_load_stackoverflow)
AT (1) ATE130462T1 (enrdf_load_stackoverflow)
DE (2) DE4101209A1 (enrdf_load_stackoverflow)
DK (1) DK0495388T3 (enrdf_load_stackoverflow)
ES (1) ES2079691T3 (enrdf_load_stackoverflow)
GR (1) GR3018391T3 (enrdf_load_stackoverflow)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE9416127U1 (de) * 1994-10-06 1994-12-08 Siemens AG, 80333 München Modul für ein Aktuator-Sensor-Interface-System
FR2775360B1 (fr) 1998-02-26 2000-04-14 Alpes Systeme Automation Dispositif auxiliaire de commande d'au moins un organe fonctionnel a commande electrique
DE10020074C5 (de) 2000-04-22 2010-04-29 Pilz Gmbh & Co. Kg Modulares Sicherheitsschaltgeräte-System
DE10233691A1 (de) * 2002-07-24 2004-02-05 Trautmann Gmbh & Co. Kg Calira-Apparatebau Stromversorgungseinrichtung für einen Wohnwagen
US11457519B2 (en) * 2018-11-30 2022-09-27 Signify Holding B.V. Lighting fixture for a light emitting diode, LED, lighting device

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL97233C (enrdf_load_stackoverflow) * 1954-09-03
DE2007988A1 (de) * 1970-02-20 1971-09-02 Linde Ag Vorrichtung zum Verbinden elektrischer Leitungen
CH599671A5 (en) * 1975-11-14 1978-05-31 Rudolf Sidler User access system for communal electrical appliances
SE413727B (sv) * 1977-05-17 1980-06-16 Transmicro Scandinavia Ab For anvendning sasom strombegrensande komponent i en elektrisk stromkrets avsett pct-motstand
US4272689A (en) * 1978-09-22 1981-06-09 Harvey Hubbell Incorporated Flexible wiring system and components therefor
DE3332811C2 (de) * 1983-09-12 1986-07-31 Nixdorf Computer Ag, 4790 Paderborn Steckeranordnung mit einer Steckerleiste und einer diese aufnehmenden Buchsenleiste
DE3733264C1 (de) * 1987-10-01 1989-03-30 Moestronik Unisel Elektronisch Elektronische Einrichtung
FR2631173A1 (fr) * 1988-05-04 1989-11-10 Meca Sarl Ste Nle Variateur de puissance de securite
DE3817869A1 (de) * 1988-05-26 1989-11-30 Rutenbeck Wilhelm Gmbh & Co Fernmeldetechnische installationsdose
DE3830742A1 (de) * 1988-09-09 1990-03-22 Elan Schaltelemente Gmbh Sicherheitsschaltung

Also Published As

Publication number Publication date
DE4101209C2 (enrdf_load_stackoverflow) 1992-11-12
GR3018391T3 (en) 1996-03-31
DE59204284D1 (de) 1995-12-21
ES2079691T3 (es) 1996-01-16
DK0495388T3 (da) 1996-02-05
DE4101209A1 (de) 1992-07-23
EP0495388A1 (de) 1992-07-22
ATE130462T1 (de) 1995-12-15

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