EP0483560A1 - Barrage photoéléctrique à fourche aux deux canaux dans un modèle du type Failsafe - Google Patents

Barrage photoéléctrique à fourche aux deux canaux dans un modèle du type Failsafe Download PDF

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Publication number
EP0483560A1
EP0483560A1 EP91117175A EP91117175A EP0483560A1 EP 0483560 A1 EP0483560 A1 EP 0483560A1 EP 91117175 A EP91117175 A EP 91117175A EP 91117175 A EP91117175 A EP 91117175A EP 0483560 A1 EP0483560 A1 EP 0483560A1
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EP
European Patent Office
Prior art keywords
light barrier
time
failsafe
circuit
self
Prior art date
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Granted
Application number
EP91117175A
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German (de)
English (en)
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EP0483560B1 (fr
Inventor
Rainer Schön
Martin Kirchner
Bernhard Sprecher
Daniel Wildisen
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Inventio AG
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Inventio AG
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
    • B66B13/00—Doors, gates, or other apparatus controlling access to, or exit from, cages or lift well landings
    • B66B13/24—Safety devices in passenger lifts, not otherwise provided for, for preventing trapping of passengers
    • B66B13/26—Safety devices in passenger lifts, not otherwise provided for, for preventing trapping of passengers between closing doors

Definitions

  • the present invention relates to a two-channel fork light barrier in failsafe design for generating shaft information when a switch flag is immersed in the shaft in the area of the door zones in elevators for the purpose of prematurely initiating the opening of the door when the elevator car is retracted into a target floor.
  • European patent application No. 0 357 888 describes a method and a device for generating shaft information for elevators by means of a safety light barrier. Circuit-internal test circuits monitor statically in the idle position and dynamically while the elevator is moving when the light barrier is inserted and removed from the from the actuating lugs in the shaft their correct function and emit appropriate error signals in the event of an error.
  • U.S. Patent No. 3,743,056 describes a failsafe detector which has a fail-safe circuit and is in particular protected against extraneous light and reflections.
  • the present invention has for its object to provide a failsafe light barrier whose operational safety and readiness is known before each trip of the elevator. This object is achieved by the invention characterized in the claims.
  • Fig.1 all parts of the device and their relationships to each other are shown in a block diagram.
  • the slot of the fork light barrier is designated, in which the switching flags, not shown, dip in and out when the elevator is traveling and thereby interrupt a light beam 11.
  • the switching flags denotes an oscillator which controls an IR transmitter diode SDA operated in terms of pulses. This sends its light through an exit window 1.2 via the space in slot 1 into an entry window 1.3, behind which a phototransistor T1 converts the light pulses into current pulses, which are then in a receiver and signal amplifier 3 be processed into a strong signal.
  • a measuring point is designated P1A.
  • the signal pulses, clocked with the oscillator signal, are subsequently integrated in an integrator 4 to form a continuous signal, which can then be tapped at a measuring point P2A. In this way, non-conforming to the oscillator frequency and any other interference signals are blanked out and eliminated.
  • a subsequent Schmitt trigger 5 is known for a clean switching edge, which can be tracked at a measuring point P3A.
  • the next switching stage with a transistor T2 controls a relay switching stage with a transistor T3 via a cyclically dynamic self-monitoring 6 (hereinafter referred to as ZDU 6).
  • a measuring point P4A is also located on the connection between the transistor and a relay coil A.
  • the relay coil A is connected in the usual way with a back diode and actuates four normally open contacts and two normally closed contacts a1 to a6.
  • the relay coil A On the positive side, the relay coil A is connected via a resistor R1A and a normally closed contact b2 to a supply voltage which comes from a voltage converter and interference filter 9.
  • the relay contacts b1 to b2 are part of the relay B in the analogue channel B of the failsafe light barrier.
  • the contact combinations a4 / b4, a5 / b5 and a3 / b3 partly present status information and partly parts of the contact safety circuit in the elevator control. With the contact a6, an LED 10 is activated as a visual status control via a resistor R3A.
  • a connection leads back to ZDU 6.
  • an output with a periodic test signal TSA leads to a bridging storey flag 8, which in turn has an input blocking signal SPS and a further input with the oscillator sequence coming from a photodiode HDA.
  • an auxiliary transmitter HSA is operated from the bridging floor flag 8.
  • the light pulses emitted by the transmitter diode SDA also act on the photodiode HDA, the pulse signals of which are continuously applied to the corresponding input of the bridging storey flag 8 and from this when a test pulse TSA arrives or a blocking signal PLC can be passed on to the auxiliary transmitter HSA. Its light pulses then act on the phototransistor T1 (FIG. 1), which completes the process referred to as an optical short circuit.
  • FIG. 2 shows the mutual arrangement of the transmitters SA and SB and the receivers EA and EB in the fork legs 12 and 13 of a fork sensor housing 14.
  • the light beams 11 of the two transmitters SA and SB are directed in opposite directions to one another, so that no stray light from a transmitter in can reach a receiver of the neighboring channel.
  • the signal diagram in FIG. 3 shows the normal function of the failsafe light barrier (hereinafter referred to as the FS light barrier).
  • the first vertical line marked with “in” represents the point in time at which a switching flag in the shaft just interrupts the light beam 11 in the FS light barrier.
  • the second vertical line marked with “off” represents the point in time at which the switching flag in the shaft just emerges from the FS light barrier and releases the light beam 11.
  • P3A After falling below the lower trigger threshold value, P3A becomes zero and subsequently also P4A, whereby relay A is energized and relay A can pick up after a time t.
  • the principle of simultaneity checking when the relays are activated is described in the application document mentioned in the prior art. The relays A and B remain energized as long as the elevator is on one floor and the light beam 11 through one Switch flag remains interrupted.
  • the effect of PLC can be seen in the signal diagram in Fig. 5.
  • the auxiliary transmitter HSA is switched on by bridging the floor flag 8 and the photo transistor T1 is fired with it. Since the light pulses originate from the SDA transmitter diode and are returned via the HDA photodiode to bridge floor flag 8, it means no difference to the original signal for the subsequent switching and the relays A and B remain dropped or do not respond to a switch flag as long as the blocking signal PLC is active.
  • These additional opto-elements are the basis for the implementation of the ZDU (cyclical dynamic self-monitoring) for error detection.
  • the term dynamic is used to address the functioning of the monitoring, which proceeds in the same way as an operating function, and the term cyclical is an indication of the periodic repetition of the monitoring function every second. It is about recognizing faulty elements and errors in function at any time.
  • the diagram of FIG. 4 shows the test signals TSA of channel A and TSB of channel B coming from the ZDU 6.
  • the test signals TSA and TSB have a pulse length tp which is, for example, half shorter than the relay dropout time t (FIG. 3).
  • the test signals TSA and TSB are offset in time from one another at a time tpv (Fig. 8). The time shift serves to ensure that the monitoring functions run completely separately for each channel in order to avoid mutual interference.
  • test signals TSA and TSB simulate a brief escape from the switch flag during which the elevator is at rest on the floor.
  • the functions correspond in principle to those as shown in the diagram in FIG. 3, with the difference that they run inversely and are much shorter in time.
  • the ZDU 6 all elements involved in the operational function are checked during the respective function cycle. In the event of a fault, the monitoring cycle is interrupted, whereupon at least one relay A or B drops out and the safety circuit of the elevator thus responds.
  • the ZDU 6 essentially consists of a number of interdependent time signal circuits.
  • the time signals and circuits are called t1A, t2A, t3A and t4A for channel A and t1B, t2B, t3B, t4B and tVB for channel B (FIG. 7).
  • 6 shows the details of the relay switching stage with the switching transistor T3 and its control with an OR gate. The inputs of the OR gate form the time signals t1A and t3A.
  • Relay A is therefore live if one or both inputs are equal to one or is not live if both inputs are equal to zero.
  • the ZDU 6 now causes both inputs t1A and t3A to periodically become zero for a short time without relay A dropping out.
  • FIG. 7 shows the time signals t1A to t4A or tVB and t1B to t4B, as well as the two OR gates and a flip-flop QFF as blocks with the corresponding connections to one another.
  • the blocks shown are the essential content of block ZDU 6 in the block diagram of FIG.
  • the upper part of the block diagram shows the elements of the A channel and the lower part those of the B channel.
  • QFF is a common element and has a synchronization task.
  • An additional time signal circuit tVB is present in the B channel and is responsible for causing a pulse shift in order to form a QFF start signal.
  • the timing of the signals mentioned is shown in the diagram in FIG.
  • the Test signals TSA and TSB, the measuring points P4A / B, the relays A / B, and a JK flip-flop output QFF are listed.
  • the time signal t1A is a bridging signal and is approximately twice as long as t1B.
  • the time signals t2A and t2B are short control signals for QFF and the time signals t3A and t3B are the actual cycle-determining signals.
  • t3A and t3B are started together with the falling edge of QFF, but have a length different by tPV, with t3A ⁇ t3B.
  • the time zero of the diagram is given when the switch flag is dipped in and defined with the vertical line marked above with "in”.
  • t1A which is identical to P3A, becomes one, generates the switching pulse t2A, which in turn makes QFF one.
  • relay A is switched on via P4A, which picks up after a time t.
  • the time signal tVB is started first and only switched through to relay B after it has expired, as a result of which it receives voltage, for example, 2 ms later.
  • the end of the time signal tVB generates the switching pulse t2B which then makes QFF zero again.
  • the falling edge of QFF is now the start signal synchronizing the two channels for the time signals t3A and t3B.
  • the time signals t3A and t3B are of different lengths, t3A being shorter than t3B.
  • the time difference corresponds to the test signal delay time tPV in the diagram in FIG. 4.
  • the first test in channel A begins by generating a test signal TSA via t4A and which makes measuring point P4A one during its duration, thus creating a time gap of the same duration for the relay.
  • the time gap in the channel B relay system is therefore composed of the duration of TSB and tVB.
  • the switching pulse t2B QFF becomes zero and the time signals t3A and t3B start again, which starts a new cycle.
  • t1A can run out without effect and is ready for the next same function.
  • the response must be on the safe side, i.e. a relay must drop out and its contacts report the fault to the safety circuits.
  • the periodic inspection of all components records interruptions, short circuits, intermittent failures and drifts. As a first example, assume that the measurement point P3A remains at zero.
  • relay B also picks up. For the time difference in which the two relays pick up one after the other, the antivalence of the outgoing relay contacts is disturbed, with which the error is reported to the control. After a cycle time tz, both relays drop out again because the faulty channel does not carry out the signal change controlled by the ZDU 6.
  • the time signal circuits are implemented by means of RC-connected, generally known, monostable CMOS multivibrators, and a likewise known dual J-K flip-flop was used for the flip-flop circuit.
  • the measuring points mentioned in the description only serve to explain the function and in the practical version are not designed as electrical connections.
  • the circuit and mode of operation of the FS light barrier shown can also be used in other areas of technology where fail-safe devices are required, such as for machine tools, trains, alarm and security systems.
  • a corresponding sensor can also be designed as a proximity sensor based on the reflex principle.
EP91117175A 1990-10-31 1991-10-09 Barrage photoéléctrique à fourche aux deux canaux dans un modèle du type Failsafe Expired - Lifetime EP0483560B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH345790 1990-10-31
CH3457/90 1990-10-31

Publications (2)

Publication Number Publication Date
EP0483560A1 true EP0483560A1 (fr) 1992-05-06
EP0483560B1 EP0483560B1 (fr) 1995-08-09

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EP91117175A Expired - Lifetime EP0483560B1 (fr) 1990-10-31 1991-10-09 Barrage photoéléctrique à fourche aux deux canaux dans un modèle du type Failsafe

Country Status (8)

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US (1) US5247139A (fr)
EP (1) EP0483560B1 (fr)
JP (1) JP3043867B2 (fr)
AT (1) ATE126172T1 (fr)
CA (1) CA2054676C (fr)
DE (1) DE59106212D1 (fr)
ES (1) ES2077759T3 (fr)
HK (1) HK204596A (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5487448A (en) * 1991-04-18 1996-01-30 Thyssen Aufzuge Gmbh Device for monitoring a control unit
CN101500923B (zh) * 2006-06-21 2012-12-05 通力股份公司 检测和停止电梯中电梯轿厢的失控移动的方法与系统
CN111295350A (zh) * 2017-10-31 2020-06-16 因温特奥股份公司 用于监控人员运送设备中的对于安全关键的状态的安全监控装置以及用于运行这种安全监控装置的方法

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05338949A (ja) * 1992-06-04 1993-12-21 Mitsubishi Electric Corp かご位置検出装置
US5567931A (en) * 1994-10-25 1996-10-22 Otis Elevator Company Variable beam detection using a dynamic detection threshold
CA2161291C (fr) * 1994-11-18 2006-01-10 Christian Arpagaus Detecteur de vitesse excessive, utilisant plusieurs barrieres lumineuses
KR970059069A (ko) * 1996-01-30 1997-08-12 이종수 엘리베이터의 위치검출기 고장유무 검출회로 및 제어방법
US5889239A (en) * 1996-11-04 1999-03-30 Otis Elevator Company Method for monitoring elevator leveling performance with improved accuracy
JP4177076B2 (ja) * 2002-10-24 2008-11-05 三菱電機株式会社 エレベータのかご位置検出装置
JP4634188B2 (ja) * 2005-02-28 2011-02-16 パナソニック電工Ｓｕｎｘ株式会社 短絡検出回路、検出センサ
AU2005335193B2 (en) * 2005-08-08 2010-01-07 Otis Elevator Company Method and system for communicating with a controller of an elevator
WO2007127949A2 (fr) 2006-04-27 2007-11-08 Sko Flo Industries, Inc. Soupape de regulation de debit
EP2021744A4 (fr) * 2006-04-28 2015-09-02 Sko Flo Ind Inc Appareil de mesure d'écoulement
KR100769673B1 (ko) * 2006-06-14 2007-10-24 삼성전자주식회사 위치인식방법 및 위치인식시스템
WO2015074958A1 (fr) 2013-11-21 2015-05-28 Inventio Ag Procédé permettant de faire fonctionner un dispositif de commande d'ascenseur
ES2713174T3 (es) * 2014-12-17 2019-05-20 Inventio Ag Dispositivo de conmutación de seguridad para una instalación de ascensor
CN107215738B (zh) * 2017-08-07 2022-09-13 陕西省特种设备质量安全监督检测中心 一种电梯门锁短接检测装置及检测方法
CN112093606A (zh) * 2019-06-17 2020-12-18 上海技防电子技术有限公司 一种基于传感器的电梯运行状态监控系统及方法

Citations (5)

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Publication number Priority date Publication date Assignee Title
US4019606A (en) * 1975-03-21 1977-04-26 Westinghouse Electric Corporation Elevator system
US4362224A (en) * 1977-11-13 1982-12-07 Otis Elevator Company Discrete position location sensor
US4785914A (en) * 1987-06-19 1988-11-22 Westinghouse Electric Corp. Elevator system leveling safeguard control and method
US4898263A (en) * 1988-09-12 1990-02-06 Montgomery Elevator Company Elevator self-diagnostic control system
EP0357888A1 (fr) * 1988-08-23 1990-03-14 Inventio Ag Méthode et dispositif pour générer une information d'une cage d'ascenseur

Family Cites Families (3)

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Publication number Priority date Publication date Assignee Title
US3743056A (en) * 1971-05-19 1973-07-03 Westinghouse Electric Corp Fail-safe detector
US3743058A (en) * 1971-10-14 1973-07-03 Otis Elevator Co Self-adjusting proximity detecting apparatus
CH594322A5 (fr) * 1975-05-21 1978-01-13 Inventio Ag

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4019606A (en) * 1975-03-21 1977-04-26 Westinghouse Electric Corporation Elevator system
US4362224A (en) * 1977-11-13 1982-12-07 Otis Elevator Company Discrete position location sensor
US4785914A (en) * 1987-06-19 1988-11-22 Westinghouse Electric Corp. Elevator system leveling safeguard control and method
EP0357888A1 (fr) * 1988-08-23 1990-03-14 Inventio Ag Méthode et dispositif pour générer une information d'une cage d'ascenseur
US4898263A (en) * 1988-09-12 1990-02-06 Montgomery Elevator Company Elevator self-diagnostic control system

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5487448A (en) * 1991-04-18 1996-01-30 Thyssen Aufzuge Gmbh Device for monitoring a control unit
EP0535205B1 (fr) * 1991-04-18 1996-02-28 Thyssen Aufzüge Gmbh Installation de surveillance pour un dispositif de commande
CN101500923B (zh) * 2006-06-21 2012-12-05 通力股份公司 检测和停止电梯中电梯轿厢的失控移动的方法与系统
CN111295350A (zh) * 2017-10-31 2020-06-16 因温特奥股份公司 用于监控人员运送设备中的对于安全关键的状态的安全监控装置以及用于运行这种安全监控装置的方法
US11618648B2 (en) 2017-10-31 2023-04-04 Inventio Ag Safety monitoring device for monitoring safety-related states in a passenger conveyor system and method for operating same

Also Published As

Publication number Publication date
ATE126172T1 (de) 1995-08-15
CA2054676C (fr) 2003-06-17
ES2077759T3 (es) 1995-12-01
HK204596A (en) 1996-11-15
US5247139A (en) 1993-09-21
JPH04292383A (ja) 1992-10-16
EP0483560B1 (fr) 1995-08-09
DE59106212D1 (de) 1995-09-14
CA2054676A1 (fr) 1992-05-01
JP3043867B2 (ja) 2000-05-22

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