EP3233694A1 - Safety switching for an elevator system - Google Patents
Safety switching for an elevator systemInfo
- Publication number
- EP3233694A1 EP3233694A1 EP15794182.4A EP15794182A EP3233694A1 EP 3233694 A1 EP3233694 A1 EP 3233694A1 EP 15794182 A EP15794182 A EP 15794182A EP 3233694 A1 EP3233694 A1 EP 3233694A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- safety
- function
- safety circuit
- detection device
- connection point
- 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
- 238000012360 testing method Methods 0.000 claims abstract description 65
- 238000001514 detection method Methods 0.000 claims abstract description 42
- 238000000034 method Methods 0.000 claims abstract description 10
- 238000009420 retrofitting Methods 0.000 claims abstract description 10
- 238000009434 installation Methods 0.000 claims description 41
- 238000012544 monitoring process Methods 0.000 claims description 17
- 238000004804 winding Methods 0.000 claims description 15
- 230000005855 radiation Effects 0.000 claims description 6
- 239000003990 capacitor Substances 0.000 claims description 4
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 230000005674 electromagnetic induction Effects 0.000 claims description 3
- 238000002955 isolation Methods 0.000 description 14
- 239000004065 semiconductor Substances 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 239000000872 buffer Substances 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 3
- 238000001208 nuclear magnetic resonance pulse sequence Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000012552 review Methods 0.000 description 2
- 230000001960 triggered effect Effects 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000005670 electromagnetic radiation Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B5/00—Applications of checking, fault-correcting, or safety devices in elevators
- B66B5/0087—Devices facilitating maintenance, repair or inspection tasks
- B66B5/0093—Testing of safety devices
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B5/00—Applications of checking, fault-correcting, or safety devices in elevators
- B66B5/0006—Monitoring devices or performance analysers
- B66B5/0018—Devices monitoring the operating condition of the elevator system
- B66B5/0031—Devices monitoring the operating condition of the elevator system for safety reasons
-
- 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
- B66B13/22—Operation of door or gate contacts
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B19/00—Mining-hoist operation
- B66B19/007—Mining-hoist operation method for modernisation of elevators
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B9/00—Kinds or types of lifts in, or associated with, buildings or other structures
Definitions
- the invention relates to a safety circuit for installations for the transport of persons and / or property, in particular for elevator installations, the use of such a safety circuit, an elevator installation and a method which is carried out with a safety circuit.
- WO 2011/054674 A1 discloses a safety circuit in an elevator installation and a method for monitoring semiconductor switches of an elevator installation.
- a periodic measurement of the voltage or the current at the input and at the output of the semiconductor switch and opening the series circuit of the safety circuit by means of a relay contact if the measurement resulted in a short circuit.
- the elements of the electromechanical relay circuit of the known embodiment are used, in the case of a short circuit of the semiconductor switch, to open the safety circuit.
- the monitoring can take place here by means of a monitoring circuit which is processor-controlled. To avoid or detect a short circuit in a semiconductor switch complicated and costly solutions can be avoided.
- WO2014 / 124779 a monitoring system for detecting a change in a switching position of a safety switch is known, wherein an independent energy supply from an external power supply device is used to determine a change in a switching position of a safety switch even in the absence of external power supply can. It remains unclear how such a monitoring system can be tested for correct function.
- An object of the invention is therefore to provide a safety circuit for installations for the transport of persons and / or property, a use of at least such a safety circuit, an elevator installation with such a safety circuit and a method which is carried out with such a safety circuit, in which an improved mode of operation is realized.
- the safety circuit is used for installations for the transport of persons and / or property.
- the safety circuit can be used in particular for a system designed as an elevator installation.
- a system designed as an elevator installation.
- Such a system has a safety function and a safety switch associated with the safety function.
- the safety switch closes or opens depending on a safety state of the safety function a safety circuit between a connection point and at least one other connection point of the safety circuit.
- a plurality of such safety circuits can be provided for the elevator installation, which if appropriate are also integrated into the safety circuit in combination with ordinary safety circuits.
- a safety circuit can be formed which has at least one such safety circuit.
- the safety circuit is integrated into the safety circuit at its connection points.
- the safety switch tion has a test function, which is provided for testing the safety function. During a test, the test function checks whether the safety switch opens and closes the safety circuit depending on the safety status of the safety function. In this case, several safety switches corresponding to several safety functions of a safety circuit can be tested together via the test function. To test whether the safety switch can open and close the safety circuit depending on the safety status of the safety function, the test function opens and closes the safety switch to be tested.
- the safety switch at least opens the safety circuit as a function of the safety state of the safety function. This ensures the immediate safety of the system.
- a detection device For the test function, a detection device is provided.
- the test signal obtained from an output part of the detection device can be evaluated via an integrated circuit having a suitable number of inputs and outputs.
- an auxiliary power function is provided, with which an auxiliary voltage can be temporarily applied via at least the safety switch and an input part of the detection device for carrying out the test function.
- This auxiliary voltage can also be applied via a plurality of safety switches, which are preferably connected in series.
- the auxiliary energy function brings a serving for generating the auxiliary voltage auxiliary power locally between the terminal and the at least one further connection point in the safety circuit.
- the inspection of the at least one safety switch of the safety circuit can be carried out independently of other and possibly conventionally executed safety monitoring of the safety circuit.
- the check by the safety circuit is preferably limited to a period in which the system is out of service. Because when the system is in operation, then the review can be done on the total safety circuit, then in particular no auxiliary power function is required.
- the safety circuit preferably has a control unit which, on the one hand, opens it by means of the test function for the purpose of checking the safety switch and closes and which further evaluates and tests the test signal received from the detection device in conjunction with the test function.
- the control unit thus checks whether the safety switch can open and close the safety circuit as a function of the safety status of the safety function.
- the test function preferably opens and closes the safety switch by means of the safety function, and the detection device detects the resulting opening and / or closing of the safety circuit.
- Test function, detection device and control unit can be divided into individual modules, but they are preferably combined to form a common module.
- the safety circuit can advantageously be used for retrofitting or retrofitting to an existing elevator installation. This results in the use of at least one safety circuit according to the invention for retrofitting or retrofitting to an existing elevator installation. If several safety circuits according to the invention are used in such a conversion or retrofitting, then these can be configured the same or differently depending on the application. Because advantageously, the safety circuits can work autonomously for themselves and thus be selected in relation to the particular site on the elevator system. This also concerns the possibility of testing one or more safety functions with one safety switch or several safety switches at the respective application site. The safety circuit can be used in particular with appropriate configuration for monitoring conventional safety monitoring.
- the at least one safety circuit can advantageously be used for retrofitting or retrofitting to an existing safety circuit of the elevator car.
- this significantly higher switching cycles can be allowed, which has a favorable effect on the maintenance and replacement intervals.
- an elevator installation with an elevator car, a driving space provided for the elevator car and several shaft doors can be realized, wherein at least one safety circuit for monitoring the elevator car and / or the Shaft doors is provided.
- This elevator installation is then realized with at least one safety circuit according to the invention on the safety circuit.
- This elevator system is particularly suitable for commercial buildings, high numbers of visitors or in other ways resulting frequent uses.
- a method for testing at least one safety function in facilities for the transport of persons and / or things are carried out, wherein the examination of the at least one safety function by the safety circuit at certain test periods during a period in which the system except Operation is.
- the test periods can be repeated periodically in an advantageous manner. The repetition is preferably performed at a distance of not more than 10 seconds. For example, the test period may be 5 milliseconds and repeated every 5 seconds.
- the auxiliary energy can be introduced in an advantageous manner in the safety circuit.
- the safety switch can be opened via the test function and the opening of the safety circuit can be detected via the detection device.
- the safety switch is advantageously closed via the test function and the closure of the safety circuit is detected via the detection device.
- the test can be done here with a small voltage, for example, 1.4 V.
- a negligible for the total energy consumption of, for example, less than 30 milliwatts (mW) sufficient.
- the output part of the detection device and the input part of the detection device are galvanically isolated from each other.
- the detection device can have, for example, an optocoupler, the input part of the detection device having a radiation transmitter of the opto-coupler, and wherein the output part of the detection device has a radiation receiver of the opto-coupler.
- the auxiliary power function introduces the auxiliary power by means of electromagnetic induction locally between the connection point and the at least one further connection point in the safety circuit.
- an electrical isolation in particular a galvanic isolation, between one side of the safety circuit, which causes the test and performs, and the other side of the safety circuit, which is electrically integrated into the safety circuit possible.
- a magnetic coupling can also take place, the input part of the detection device having, for example, a coil, and the output part of the detection device having a magnetic field detector, such as a further coil or a Hall sensor.
- an isolating transformer is provided for the auxiliary power function and that an output winding of the isolating transformer is connected in series with the safety switch between the connection point and the at least one further connection point.
- the input winding of the isolation transformer may be connected to an integrated circuit.
- the detection device is integrated in the drive of the isolation transformer or in itself.
- two different effects can be exploited.
- a pulse, a pulse train, or an AC signal on the primary side is initiated and the current or inductance of the primary coil is measured.
- a higher current, or a smaller inductance shows that current can flow in the secondary side and the safety switch is closed.
- directional diodes are provided which allow a closed circuit via the output winding of the isolation transformer and the safety switch within a subcircuit between the connection point and the at least one further connection point.
- the safety circuit can be interrogated via a DC voltage signal, which rests proportionately between the connection point and the at least one further connection point such that the directional diodes are oriented in the reverse direction.
- the auxiliary voltage on the other hand, preferably has an alternating current component, which results in the closed circuit via the directional diodes.
- an isolating transformer is provided for the auxiliary power function, that an output winding of the isolation transformer is arranged in a subcircuit which is realized between the connection point and the at least one further connection point, and that the isolation transformer via at least one capacitor of the subcircuit of a DC path between the junction and the at least one other connection point is kept out.
- a query of the safety circuit via a DC voltage of the interrogating DC current can be performed via a DC path, from which the isolation transformer is kept out. Possible influences of the isolation transformer, which can occur in particular with a possible steep switch-on edge of the DC voltage signal, are thereby avoided.
- the safety function serves for checking a correct deceleration before reaching an end stop or for checking a correctly closed car door for a drive of the elevator car.
- Special safety functions to check for a correct delay before reaching a final stop are usually never switched.
- To check the correct shutdown these safety functions or the associated preferably electronic safety switch can be checked with the safety circuit.
- critical parts of the safety circuit or of a semiconductor component or solid-state component can be supplied with a small galvanically isolated voltage signal and thus the correct functioning of the at least one safety switch can be checked at any time.
- This approach is particularly interesting when existing elevator systems are equipped in a modernization with new, modern components, which include, for example, electronic switching elements, in particular semiconductor devices or solid state devices. This high switching cycles can be realized. Therefore, it is advantageous that the safety switch is designed as an electronic safety switch.
- a plurality of safety functions are provided, that a plurality of safety switches are provided for the plurality of safety functions, that the control unit with test function and detection device is provided for checking the safety functions, which checks whether the safety switches the safety circuit in dependence on the safety states of the safety functions open and close, and that the auxiliary voltage via the safety switch and the input part of the detection device can be applied.
- several safety functions which are preferably implemented locally together, are checked locally with respect to the operation of their safety switches, for example, if the elevator system is out of service.
- FIG. 1 shows an elevator system with a safety circuit on a safety circuit in an excerpt, schematic representation according to a possible embodiment of the invention.
- FIG. 2 shows a safety circuit for the elevator installation shown in FIG. 1 according to a first exemplary embodiment of the invention
- FIG. 3 shows a safety circuit for the elevator installation shown in FIG. 1 according to a modified first exemplary embodiment of the invention
- FIG. 4 shows a safety circuit for the elevator installation shown in FIG. 1 according to a second exemplary embodiment of the invention.
- Fig. 5 is a signal flow diagram for explaining the operation of a possible embodiment of a safety circuit of the invention.
- Fig. 1 shows an elevator system 1 with a safety circuit 2 to a safety circuit 3 in an excerpt, schematic representation according to a possible embodiment of the invention.
- the elevator installation 1 here is a preferred embodiment of a system 1 for the transport of persons and / or property.
- the elevator installation 1 has an elevator car 4 and an elevator shaft 5.
- the elevator car 4 is in this case movable in a provided for a drive of the elevator car 4 driving compartment 6.
- the driving compartment 6 is hereby part of the elevator shaft 5.
- the safety circuit 2 is particularly suitable for such an elevator installation 1.
- the elevator installation 1 also has a drive machine unit 7 with a traction sheave 8 and a counterweight 9.
- the elevator car 4 is suspended on a traction means 10, which also serves as a support means 10.
- the traction means 10 is guided around a deflection roller 11 and around the traction sheave 8. Further, the traction means 10 is connected to the counterweight 9.
- a top floor 12 and a bottom floor 13 are shown to simplify the illustration.
- buffers 14, 15 are arranged in the elevator shaft 5, against which the elevator car 4 or the counterweight 9 impact in the event of a malfunction.
- On the floor 12 is a storey door 16 is provided.
- the safety circuit 3 is shown essentially with respect to its electrical connections.
- a safety monitoring 20 and a safety monitoring 21 are integrated via electrical lines 18 and electrical lines 19.
- a safety switch 22 is provided here, which monitors the floor door 16.
- a safety switch 23 is provided which monitors the landing door 17.
- the security monitors 20, 21 may be designed conventionally.
- the safety switches 22, 23 may be mechanical safety switches 22, 23.
- the safety circuit 2 is configured according to a possible embodiment of the invention.
- a first embodiment of a possible embodiment of the safety circuit 2 is described in more detail with reference to FIG. 2.
- a second embodiment of a possible embodiment of the safety circuit 2 is described in more detail with reference to FIG. 4.
- the safety circuit 2 shown in FIG. 1 is integrated into the safety circuit 3 via an electrical line 30 and an electrical line 31.
- a first terminal 32 and a second terminal 33 are illustrated, on which the electrical connection with the rest of the safety circuit 3 comes about.
- the electrical lines 30, 31 are shown simplified in FIG. 1 in terms of their electrical function.
- suitable cables can be provided which are suspended in the elevator shaft 5, so that the elevator car 4 can be moved by the travel compartment 6, while the electrical connection with the safety circuit 3 remains.
- Such suspended in the elevator shaft 5 electrical lines may be part of the electrical lines 30, 31 or be mounted as separate, additional electrical connection elements.
- other possibilities are conceivable to integrate the safety circuit 2 in the safety circuit 3.
- stationary devices such as the storey doors 16, 17, can be monitored via stationary security monitoring 20, 21, which are integrated in a separate safety circuit.
- the safety circuit 2 comprises a first safety switch 34 and a second one Safety switch 35.
- the first safety switch 34 serves for a delay control device 36.
- the second safety switch 35 serves to monitor the elevator car door 37.
- the deceleration control device 36 is arranged on the elevator car 4.
- the delay control device 36 can also be retrofitted to an existing elevator car 4.
- the delay control device 36 cooperates with a measuring tape 38, are attached to the coding. From the codes applied to the measuring tape 38, the delay control device 36 recognizes the current position of the elevator car 4 in the travel compartment 6. In particular, this can be used to determine a distance to a ceiling 39 or to a floor 40 of the elevator shaft 5.
- such a delay control device 36 can also be based on another principle.
- the delay control device 36 can realize the principle of a radar using electromagnetic radiation, for example to detect the distance to the ceiling 39 and / or to the floor 40.
- the delay control device 36 can monitor a reliable braking of the elevator car 4, in particular in the region of the uppermost floor 12 and the lowest floor 13. As a result, a safety function is realized, which prevents a collision with the ceiling 39 or an excessive impact of the elevator car 4 on the buffer 14 and / or the counterweight 9 on the buffer 15.
- the delay control device 36 actuates the first safety switch 34 for this purpose if the delay is too low. If the first safety switch is actuated and thus opened, then an emergency stop is triggered in normal operation via the safety circuit 3.
- the second safety switch 35 is actuated upon opening of the elevator car door 37. If the elevator car 4 stops at one of the floors 12, 13, then the second safety switch 35 can be bridged. If, however, the elevator car 4 moves through the travel space 6, then an emergency stop is triggered via the safety circuit 3 when the second safety switch 35 is open.
- An operation of the elevator installation 1 is here understood to mean that a main energy supply is present to an extent such that a device 45 of the safety circuit 3 monitors the opening of one of the safety switches 22, 23, 34, 35 or the proper functioning of a safety switch 22, 23, 34, 35 can check.
- a DC voltage 46 is applied to the safety circuit 3 and checks whether a current shortage results. The concern of the DC voltage 46 can be repeated within certain time intervals and thus only for a short test period.
- the elevator installation 1 If the elevator installation 1 is thus put out of operation, then possibly occurring safety functions can not be checked via the device 45 of the safety circuit 3. However, such a test is possible locally via the safety circuit 2 according to the embodiments of the invention. In this case, this enabling the check is shown by way of example with reference to the safety circuit 2.
- the security monitors 20, 21 are here considered as conventional security monitors 20, 21, which can only be checked by the device 45. However, it is understood that the operating principle of the safety circuit 2, which allows a local check, in a corresponding manner on other security monitoring of the elevator installation 1, in particular on the security monitors 20, 21, can be realized. Depending on the application, differently configured safety circuits 2 can be used at the respective application site.
- the safety circuit 2 is partially housed in a housing 47 in this embodiment.
- the safety circuit 2 can in this case also be partially integrated into the elevator control.
- FIG. 2 shows a safety circuit 2 for the elevator installation 1 shown in FIG. 1 according to a first exemplary embodiment of the invention.
- the safety circuit 2 has a control unit 48, which can be realized by an integrated circuit 48.
- An auxiliary power function H can be activated via the control unit 48. If the auxiliary power function H is activated, then an auxiliary signal 49 with or without a DC voltage component and an AC component of an appropriate waveform is generated.
- the auxiliary signal 49 may be embodied, for example, as a rectangular signal or as a sinusoidal signal.
- the safety circuit 2 further comprises an isolating transformer 50 having an input winding 51 and an output winding 52.
- the auxiliary signal 49 is fed via the input winding 41. As a result, an auxiliary voltage is induced in the output winding 52.
- safety functions A, B are realized. In a modified embodiment, only one safety function A can be realized. Furthermore, more than two safety functions A, B can be realized.
- Each of the safety functions A, B is assigned to a safety switch 34, 35.
- the first safety switch 34 is provided for the delay control device 36.
- the second safety switch 35 is provided for the elevator car door 37.
- the number of safety switches 34, 35 is generally the same as the number of safety functions A, B in this case.
- a current flow in a subcircuit 53 of the safety circuit 2 is realized via the induced auxiliary voltage.
- the subcircuit 53 is in this case completely within the range between the terminals 32, 33. Thus, there is a local current flow.
- At least one directional diode 54 and at least one directional diode 55 are arranged here in the subcircuit 53.
- at least one directional diode 56 is arranged in the electrical line 30, which, however, is located outside of the subcircuit 53.
- the at least one directional diode 56 is in fact provided for checking by means of the device 45, but now it is assumed that the elevator installation 1, as defined above, is out of operation.
- a voltage drop occurs at the at least one directional diode 55.
- the voltage drop results from the lock voltage or the sum of the lock voltages of the at least one directional diode 55 when the at least one directional diode 55 is in the forward direction is controlled.
- a detection device 57 with an input part 58 and an output part 59 is provided.
- the input part 58 has a photodiode 58, which is operated with the voltage drop across the at least one directional diode 55.
- the photodiode 58 is associated with a phototransistor 60.
- the phototransistor 60 is driven at its base via the photodiode 58 and fed via a resistor 61 from a voltage source 62. If the phototransistor 60 is switched in the forward direction due to the drive via the photodiode 58, then an input signal E is connected to ground. On the other hand, when the phototransistor 60 is off, the input signal E is at the positive voltage of the voltage source 62.
- an optocoupler 58, 60 is realized via the photodiode 58 and the phototransistor 60.
- the photodiode 58 is in this case an embodiment of a radiation emitter 58 of the optocoupler 58, 60.
- the phototransistor 60 is here a possible embodiment of a radiation receiver 60 of the optocoupler 58, 60.
- About the optocoupler 58, 60 is a galvanic isolation between the input part 58 and Output part 59 realized.
- the isolation on the side of the control unit 48 is independent of a possible ground of the safety circuit 3 on the side of the terminals 32, 33.
- the auxiliary power which is introduced by the auxiliary power function H for generating the auxiliary voltage in the subcircuit 53 locally between the connection point 32 and the at least one further connection point 33 in the safety circuit 3, is thus introduced locally by means of electromagnetic induction.
- the feedback also takes place locally and via a galvanic isolation.
- the control unit 48 For checking the safety functions A, B, the control unit 48 has a test function T.
- the detection device 57 is provided locally for the test function T.
- the evaluation is carried out here by the control unit 48.
- FIG. 3 shows a safety circuit for the elevator installation shown in FIG. speaking a modified embodiment of the invention.
- the structure of the safety circuit 2 differs from the embodiment described in FIG. 2 in that the detection device 57 is arranged in the primary circuit of the auxiliary power function H or its isolation transformer 50.
- a first effect is used. An impulse is introduced into the primary circuit of the isolating transformer 50 and a corresponding reflection is awaited. This occurs only when current can flow on the secondary side, that is, when the safety switch 34, 35 is closed. Consequently, if no reflection is detectable or measurable, the safety switch 34, 35 is actually opened. Opening the safety switch 34, 35 accordingly causes a lack of reflection.
- the control and evaluation of the pulse sequence and the reflection in this case takes place in turn by the control unit 48.
- another effect is used.
- a pulse, a pulse sequence or an AC signal on the primary side of the isolating transformer 50 is introduced and a current or an inductance of the primary coil is measured.
- a higher current, or a smaller inductance shows that current can flow in the secondary side and the safety switch is closed.
- the control unit 48 in this case controls the pulse sequence and compares the state with the safety switch 34, 35 open and closed with each other and thus checks to what extent the safety switch 34, 35 has actually opened.
- FIG. 4 shows a safety circuit 2 for the elevator installation 1 shown in FIG. 1 according to a further exemplary embodiment of the invention.
- the auxiliary voltage is induced in a subcircuit 63 between the connection point 32 and the at least one further connection point 33.
- the output winding 52 of the isolating transformer 50 between the terminals 32, 33 in a series circuit with the safety switches 34, 35 and the at least one directional diode 55.
- a separation via at least one capacitor 64, 65 is provided. This means that, during operation of the elevator installation 1, the test taking place via the safety circuit 3 does not lead the current path via the output winding 52.
- the isolating transformer 50 is connected via the capacitors 64, 65 from a direct current path between the connection point 32 and the at least one further Ren junction 33 held out.
- the detection device 57 is, as explained in connection with FIG. 2, provided with an input part 58 and an output part 59.
- the input part 58m has a coil body 58m, which is integrated directly into the partial circuit 63.
- a Hall sensor or a magnetic field detector 60m is arranged in the bobbin.
- the magnetic field detector 60m is used to check the interruption of the circuit and thus a correct opening of the safety switches 34, 35 of the safety functions A, B.
- the two principles are essentially interchangeable. Further, to simplify the illustration, the control unit 48 is not shown.
- Fig. 5 shows a signal flow diagram for explaining the operation of a possible embodiment of the safety circuit 2 of the invention.
- a method for testing the safety functions A, B such tests can be repeated at certain intervals.
- the auxiliary energy functions H, the safety functions A, B and the input signal E which are plotted on the ordinates, are illustrated in binary coded form.
- the time t is plotted on the abscissa.
- the power source 62 is permanently turned on. In a modified embodiment, however, the voltage source 62 can also be temporarily switched off between the test procedures. Until the time ti, the auxiliary power function H is not needed. Since no auxiliary power is introduced into the safety circuit 3, the photodiode 58 remains de-energized, so that the phototransistor 60 blocks. The input signal E is therefore set to 1 according to the voltage source 62. At the time ti, the auxiliary power function H is needed and thus set to 1 in this signal schedule. However, the test function T does not activate any of the safety functions A, B between times ti and t 2. Therefore, the safety switches 34, 35 remain closed.
- auxiliary energy results in an auxiliary voltage which activates the optocoupler 58, 60 via the voltage drop across the at least one directional diode 55.
- the phototransistor 60 switches to ground, so that the input signal E is set to 0.
- the safety function A is actuated for testing. This leads to the opening of the first safety switch 34. This means an interruption of the current flow at the input part 58. Accordingly, the input signal E is set to 1.
- the safety function B is activated, so that in this case the second safety switch 55 interrupts the current flow through the photodiode 58. As a result, the input signal E is reset to 1.
- a simultaneous actuation of the safety functions A, B can subsequently take place. This is shown here between the times t 6 and t 7 .
- the current flow through the input part 58 is interrupted, so that the input signal E is set to 1.
- the auxiliary power function H is deactivated.
- a local monitoring of the safety circuit 2 can be performed. For example, if a building is not open overnight or between work- is net and an error occurs during this period, then this can be detected promptly during an inspection. In particular, it is checked whether the safety switches 34, 35 open and close the safety circuit as a function of the safety status of the safety functions A, B. If one of the safety switches 34, 35 fails, then this failure is detected, for example, over the test cycle described. A service technician can then correct the error promptly.
Landscapes
- Maintenance And Inspection Apparatuses For Elevators (AREA)
- Elevator Control (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP14198526 | 2014-12-17 | ||
PCT/EP2015/076499 WO2016096269A1 (en) | 2014-12-17 | 2015-11-13 | Safety switching for an elevator system |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3233694A1 true EP3233694A1 (en) | 2017-10-25 |
EP3233694B1 EP3233694B1 (en) | 2019-01-23 |
Family
ID=52231862
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP15794182.4A Active EP3233694B1 (en) | 2014-12-17 | 2015-11-13 | Safety circuit for a lift facility |
Country Status (5)
Country | Link |
---|---|
US (1) | US10526169B2 (en) |
EP (1) | EP3233694B1 (en) |
CN (1) | CN107250018B (en) |
ES (1) | ES2713174T3 (en) |
WO (1) | WO2016096269A1 (en) |
Families Citing this family (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10012696B2 (en) * | 2013-02-12 | 2018-07-03 | Inventio Ag | Battery-assisted safety circuit monitoring system |
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US10526169B2 (en) | 2014-12-17 | 2020-01-07 | Inventio Ag | Safety switching for an elevator system |
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2015
- 2015-11-13 US US15/537,447 patent/US10526169B2/en active Active
- 2015-11-13 EP EP15794182.4A patent/EP3233694B1/en active Active
- 2015-11-13 ES ES15794182T patent/ES2713174T3/en active Active
- 2015-11-13 CN CN201580076272.2A patent/CN107250018B/en active Active
- 2015-11-13 WO PCT/EP2015/076499 patent/WO2016096269A1/en active Application Filing
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EP3233694B1 (en) | 2019-01-23 |
CN107250018A (en) | 2017-10-13 |
US10526169B2 (en) | 2020-01-07 |
ES2713174T3 (en) | 2019-05-20 |
CN107250018B (en) | 2019-05-31 |
US20170341906A1 (en) | 2017-11-30 |
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