Control device for controlling elevator equipment during inspection operation and elevator equipment

Abstract

The invention relates to a control device (200) for controlling an elevator system (100) in a test operation, the elevator system (100) having a safety circuit (206) having at least one safety contact (204) which is opened in the test operation, and the elevator system (100) having a test line (202) for bridging the at least one safety contact (204). The control device (200) comprises: a first operating element (PB1) for operating an elevator device (100) in an inspection operation, a second operating element (PB2) for operating the elevator device (100) in an inspection operation, a first switch unit (K1) and a second switch unit (K2) connected in parallel with the first switch unit (K1), wherein the first switch unit has a first contact (K1-3) and a first delay element (C1) and is designed to close the first contact (K1-3) in response to the operation of the first operating element (PB1) and to open in response to the release of the first operating element (PB1), and the second switch unit has a second contact (K2-3) and a second delay element (C2) and is designed to close the second contact (K2-3) in response to the operation of the second operating element (PB2) and to open in response to the release of the second operating element (PB2). The first contact (K1-3) and the second contact (K2-3) are connected in series in the inspection line (202). The first delay element (C1) is designed to delay the disconnection of the first contact (K1-3) by a first delay time after the first operating element (PB1) is released. The second delay element (C2) is designed to delay the disconnection of the second contact (K2-3) by a second delay time after the second operating element (PB2) is released.

Description

Technical Field

[0001] The invention relates to a control device for controlling an elevator system in a test run and also to an elevator system having such a control device. Background Art

[0002] Elevators such as passenger elevators or freight elevators are usually equipped with a safety circuit. Such a safety circuit usually comprises a series of safety-related switches, at least one of which can be opened under certain operating conditions, for example when the elevator is in inspection mode, a fault is detected or a car door, shaft door, service door or service flap is open. If the safety circuit is interrupted, the elevator is stopped by switching off the drive of the elevator and activating the brake for braking the elevator. As door switches, the switches monitor, for example, the closed state of the elevator doors, i.e. one car door and several shaft doors, so that it is ensured that the travel basket can only be moved if all elevator doors are closed and the associated door switches are operated.

[0003] When the elevator is in the inspection operation, for example for repair or maintenance purposes, the safety circuit is usually interrupted, for example because the corresponding switch in the safety circuit is disconnected by putting the elevator in the inspection mode, or the shaft door must be opened so that the technician can enter the elevator shaft through the shaft door. In order to still be able to operate the elevator, the disconnection contacts of the safety circuit can be closed by the inspection circuit. The inspection circuit can be closed by an inspection controller with a plurality of operating buttons. For example, in order to move the elevator in the inspection operation, a first operating button for releasing the travel movement and a second operating button for specifying the travel direction must be pressed simultaneously. If one of the operating buttons is released, the inspection circuit and thus also the safety circuit are immediately interrupted again, which leads to the braking device being immediately activated and the elevator being braked relatively suddenly. As a result, forces are generated that exert heavy loads on the load-bearing elements of the elevator. Vibrations that affect the maintenance personnel and their processes (for example, the precise positioning of the car) may be caused by these forces.

[0004] EP2493802B1 describes a safety circuit in an elevator system. The safety circuit comprises a series circuit of at least one safety-related contact that is closed during interference-free operation of the elevator system. At least one contact can be bridged by a semiconductor switch, wherein the semiconductor switch can be controlled by at least one processor and can be monitored for short circuits by at least one monitoring circuit. In addition, the safety circuit comprises at least one electromechanical relay circuit having relay contacts connected in series with the contacts of the bridgeable series circuit. The relay circuit can be controlled by a processor. In the event of a short circuit in the semiconductor switch, the bridgeable series circuit can be interrupted by the relay contacts. Summary of the invention

[0005] The object of the invention is to improve the braking behavior of an elevator, in particular during an inspection when the elevator's safety circuit is disconnected. The prior art deals with safely interrupting the bridge line, because the car is moving towards an unsafe state. The object of the invention is to terminate the car movement during the inspection run. There is no urgency here.

[0006] The object is achieved by a control device and an elevator installation according to the invention. Advantageous embodiments are defined in the following description.

[0007] A first aspect of the present invention relates to a control device for controlling an elevator device in a test run. The elevator device includes a safety circuit having at least one safety contact that is opened during the test run and a test line for bridging the at least one safety contact. The control device includes a first operating element for operating the elevator device in the test run, a second operating element for operating the elevator device in the test run, and a first switch unit, the first switch unit having a first contact and a first delay element, and the first switch unit is designed to close the first contact in response to the operation of the first operating element and to open in response to the release of the first operating element. The first delay element is designed to delay the opening of the first contact by a defined first delay time after the release of the first operating element. In addition, the control device includes a second switch unit connected in parallel with the first switch unit, the second switch unit having a second contact and a second delay element, and the second switch unit is designed to close the second contact in response to the operation of the second operating element and to open in response to the release of the second operating element. The second delay element is designed to delay the opening of the second contact by a defined second delay time after the release of the second operating element. In this case, the first contact and the second contact are connected in series in the test line.

[0008] Such a control device can activate the brake device of the elevator system in a time-staggered manner to release at least one of the two operating buttons of the inspection controller. This delay can be used to stop the elevator system in a controlled manner by adjusting the drive of the elevator system before the elevator system is mechanically braked by the brake device. As a result, the load on the load-bearing elements of the elevator system can be reduced. The wear of the brake disc and brake lining of the brake device can also be reduced. Another advantage is that the convenience for maintenance personnel is increased, especially when the maintenance personnel stay on the top of the car when the elevator system is moving.

[0009] A safety circuit can be understood as a circuit of an elevator system that includes a series connection of a plurality of safety-related contacts. These safety contacts can be closed during normal operation, thereby closing the entire safety circuit and thus, in particular, enabling the travel basket to be displaced. Under certain operating conditions, for example, in the event of a fault or when the elevator system is in an inspection run, at least one of the safety switches and thus the entire safety circuit can be opened, thereby stopping the elevator system. In particular, when the safety circuit is interrupted, an emergency brake of the elevator system can be triggered.

[0010] The test line can be understood as a current line connected in parallel with the series circuit of the safety contacts. The test line can include a series circuit with at least two switch contacts. The safety contacts can be bridged by closing all contacts in the test line.

[0011] The operating element can generally be understood as a switch that is operated by the touch or pressure of a finger or hand and automatically returns to the inactive position when the finger or hand is removed or released. For example, the operating element can be a mechanical key or button or a sensor key, such as a capacitive key or a Hall key.

[0012] The first operating element and the second operating element can each be coupled to a programmable elevator controller of the elevator system. The elevator controller can be configured to detect the respective current switching state of the operating elements and, depending on the switching state, to operate the rectifier of the elevator system.

[0013] For example, the first operating element can be a switch for releasing a travel movement of the elevator installation, while the second operating element can be a switch for specifying the direction of the travel movement.

[0014] The first switching unit and the second switching unit can be designed in the same way, for example. The two switching units can include electromechanical and / or electronic components. In particular, the two switching units can be implemented completely in hardware, for example in the form of electromechanical relays. As a result, the inspection effort before the commissioning of an elevator installation equipped with such a control device can be reduced. However, at least one of the two switching units can also be used as a programmable electronic module, in particular as a PES SRAL module (PES SRAL = Programmable Electronic System in Safety Related Applications for Lifts; "Programmable Electronic System for Electrical Safety Devices of Elevators") or as a component of such an electronic module.

[0015] The corresponding contacts of the two switching units can be mechanical contacts or semiconductor contacts.

[0016] In the simplest case, both delay elements can be additional capacitors for storing the electrical energy required for driving the associated contacts. For example, the capacitors can be connected to the associated contacts in such a way that when the capacitors are discharged, the associated contacts can no longer be operated. Alternatively, each delay element can be a (programmable) hardware or software module coupled to a suitable timer.

[0017] The first delay time and the second delay time may be the same or different.

[0018] A second aspect of the invention relates to an elevator system having a safety circuit with at least one safety contact which is opened during a test run of the elevator system, a test line for bridging the at least one safety contact, and a control device, as described above and below.

[0019] The possible features and advantages of embodiments of the present invention may be primarily, but not limitingly, considered to be based on the concepts and insights presented below.

[0020] According to one embodiment, the elevator installation may include at least one traveling basket, a drive for driving the at least one traveling basket, a rectifier for regulating the power supply of the drive, and a braking device that can be activated by interrupting a safety circuit for braking the at least one traveling basket. In this case, the first delay time and the second delay time may each be selected in such a way that the at least one traveling basket can be stopped by regulating the power supply of the drive before the braking device is activated.

[0021] For example, the elevator controller can be configured to actuate the rectifier as a direct reaction to the release of at least one of the two operating elements so that the drive stops. The corresponding delay time should therefore be as short as possible as long as it is not shorter than the minimum time required for the rectifier to bring the drive down to a standstill. Alternatively, the delay time can be selected so that at least one travel basket is not braked to a standstill but at least to a very low speed before the brake device is activated.

[0022] A braking device may be understood to be a mechanical, for example electrically controllable machine brake or a brake on the chassis.

[0023] According to one embodiment, the first delay time and the second delay time may both be greater than 10 ms. The delay times may also be significantly greater than 10 ms, such as greater than 20 ms, greater than 50 ms, greater than 100 ms, greater than 500 ms, greater than 1 s, greater than 1.5 s and / or up to 2 s.

[0024] According to one embodiment, the control device may further include a third switch unit connected in parallel with the first switch unit and the second switch unit. The third switch unit may include a third contact and a third delay element, and the third switch unit is designed to close the third contact in response to the operation of the first operating element and / or the second operating element, and to open in response to the release of the first operating element and the second operating element. The third delay element may be designed to delay the closing of the third contact by a defined third delay time after the operation of the first operating element and / or the second operating element. The third contact may be connected in series with the first contact and the second contact in the inspection circuit.

[0025] This makes it possible to achieve that no matter how short the time interval between the operation of the first operating element and the operation of the second operating element is, the check circuit is always closed with a certain delay. For example, if the third delay time is longer than the time interval between the operation of the first operating element and the operation of the second operating element, the check circuit can remain interrupted for a certain time even though both operating elements have been operated. Thus, a switch-on delay can be achieved.

[0026] According to one specific embodiment, the third switching unit may be designed to prevent at least one of the three contacts in the test line from closing in the event of a fault in the third switching unit.

[0027] This prevents the test line from closing without a switch-on delay.

[0028] According to one embodiment, the first switch unit may have a first control connection and be designed to close the first contact when a control signal is applied to the first control connection, and to open the first contact when no control signal is applied to the first control connection. In this case, the first operating element may be designed to connect the first control connection to a signal source for providing a control signal in the operating position and to separate it from the signal source in the deactivated position. Therefore, the first delay element may be designed to delay the fall of the control signal at the first control connection by a first delay time when the first control connection is separated from the signal source.

[0029] The control signal can be understood as, for example, a current signal or a voltage signal. Therefore, the signal source can be understood as an electrical energy source in the form of a current source or a voltage source.

[0030] The first control terminal can be, for example, a coil terminal of a relay or a gate or base terminal of a transistor.

[0031] According to one embodiment, the second switch unit may have a second control connection terminal and the second switch unit may be designed to close the second contact when the control signal is applied to the second control connection terminal, and to open the second contact when no control signal is applied to the second control connection terminal. In this case, the second operating element may be designed to connect the second control connection terminal to a signal source for providing a control signal in the operating position and to separate the second control connection terminal from the signal source in the deactivated position. Therefore, the second delay element may be designed to delay the fall of the control signal at the second control connection terminal by a second delay time when the second control connection terminal is separated from the signal source.

[0032] The second control terminal can be, for example, a coil terminal of a relay or a gate or base terminal of a transistor.

[0033] According to one embodiment, the first switch unit may have a fourth contact and be designed to disconnect the fourth contact when the control signal is applied to the first control connection terminal, and to close the fourth contact when no control signal is applied to the first control connection terminal. The second switch unit may have a fifth contact, and the second switch unit is designed to disconnect the fifth contact when the control signal is applied to the second control connection terminal, and to close the fifth contact when no control signal is applied to the second control connection terminal. The third switch unit may also have a third control connection terminal and be designed to disconnect the third contact when the control signal is present on the third control connection terminal, and to close the third contact when the control signal is not present at the third control connection terminal. Therefore, the third delay element may be designed to delay the fall of the control signal at the third control connection terminal by a third delay time when the third control connection terminal is separated from the signal source for providing the control signal. The third control connection terminal may be connected to the signal source via the fourth contact and the fifth contact. Here, the fourth contact and the fifth contact may be connected in series.

[0034] For example, the third delay element may include a capacitor that can provide electrical energy for operating the third contact (or other contact) of the third switch unit. Here, the third switch unit can be separated from the signal source by disconnecting the fourth contact or the fifth contact, so that the third switch unit is provided with electrical energy only by the capacitor. Here, the capacitance of the capacitor determines the third delay time. Only when the capacitor is discharged, the third contact in the check circuit will be closed. In other words, the two operating elements must be kept in their respective operating positions at the same time for at least the duration of the third delay time in order to close the check circuit.

[0035] According to one embodiment, the first switch unit may have a sixth contact, and the first switch unit is designed to close the sixth contact when the control signal is applied to the first control connection terminal and to open the sixth contact when no control signal is applied to the first control connection terminal. In addition, the third switch unit may have a seventh contact, and the third switch unit is designed to close the seventh contact when the control signal is applied to the third control connection terminal and to open the seventh contact when no control signal is applied to the third control connection terminal. In this case, the sixth contact may be connected between the first operating element and the first control connection terminal. The seventh contact may be arranged in a bridge line that bridges the sixth contact.

[0036] In other words, the first control connection can only be connected to the signal source via the first operating element when the bridge line is closed. This is the case when the seventh contact is closed by the third switching unit. If the seventh contact cannot be closed for some reason, the first contact that can be controlled via the first control connection can no longer be operated, i.e. can no longer be closed.

[0037] For example, the first contact, the fourth contact and the sixth contact can be forced to guide. In this case, the first switching unit can occupy exactly two switching states. In the first switching state, the first contact and the sixth contact are open, while the fourth contact is closed. In the second switching state, the first contact and the sixth contact are closed, while the fourth contact is closed.

[0038] According to one embodiment, the second switch unit may have an eighth contact, and the second switch unit is designed to close the eighth contact when the control signal is applied to the second control connection terminal and to open the eighth contact when no control signal is applied to the second control connection terminal. The third switch unit may have a ninth contact, and the third switch unit is designed to close the ninth contact when the control signal is applied to the second control connection terminal and to open the ninth contact when no control signal is applied to the third control connection terminal. In this case, the eighth contact may be connected between the second operating element and the second control connection terminal. The ninth contact may be arranged in a bridging line that bridges the eighth contact.

[0039] In other words, the second control connection can only be connected to the signal source via the second operating element when the bridge circuit bridging the eighth contact is closed. This is the case when the ninth contact is closed by the third switching unit. If the ninth contact cannot be closed for some reason, the second contact that can be controlled via the second control connection can no longer be operated, i.e. can no longer be closed.

[0040] For example, the second contact, the fifth contact and the eighth contact can be forcibly guided. In this case, the second switching unit can occupy exactly two switching states. In the first switching state, the second contact and the eighth contact are open, while the fifth contact is closed. In the second switching state, the second contact and the eighth contact are closed, while the fifth contact is open.

[0041] Additionally or alternatively, for example, the third contact, the seventh contact and the ninth contact can be forcibly guided. In this case, the third switching unit can occupy exactly two switching states. In the first switching state, the third contact is open, while the seventh contact and the ninth contact are closed. In the second switching state, the third contact is closed, while the seventh contact and the ninth contact are open.

[0042] According to one embodiment, the first switch unit may be designed as a first electromechanical relay. Additionally or alternatively, the second switch unit may be designed as a second electromechanical relay. Additionally or alternatively, the third switch unit may be designed as a third electromechanical relay.

[0043] Such a relay may comprise a coil and an adjustment element electromagnetically coupled to the coil, for example in the form of a flip or pull armature, wherein the adjustment element is attracted when the coil is switched on and is moved back into the inactive position, for example by a spring force, when the coil is de-energized. The adjustment element may be mechanically coupled to one or more contacts of the relay. If the relay comprises a plurality of contacts, the contacts may be forcibly guided by the adjustment element. For example, a disconnection point ( ) and the closing point (Schliesser) are closed or opened simultaneously. A high degree of robustness of the control device can be achieved through this embodiment. In addition, the control device can be realized with relatively little expenditure.

[0044] According to one embodiment, the first delay element may include a capacitor connected in parallel with the coil of the first relay. Additionally or alternatively, the second delay element may include a capacitor connected in parallel with the coil of the second relay. Additionally or alternatively, the third delay element may include a capacitor connected in parallel with the coil of the third relay.

[0045] The respective capacitance of the capacitor can be selected according to the respective delay time to be achieved. For example, the controller can be configured to connect the capacitor of the first relay to the power supply in response to the operation of the first operating element to charge the capacitor, and to disconnect the capacitor and the coil of the first relay from the power supply in response to the release of the first operating element. It can thus be ensured that once the first operating element is released, the coil is only supplied with electrical energy via the capacitor. This can also be applied to the second relay in a similar manner. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] The embodiments of the present invention are described below in conjunction with the accompanying drawings, wherein the drawings and the description should not be construed as limiting the present invention.

[0047] Figure 1 An exemplary embodiment of an elevator installation is shown.

[0048] Figure 2 Show Figure 1 A control device in the off state.

[0049] Figure 3 Show Figure 1 A control device that is in the on state.

[0050] Figure 4 Show Figure 1 A control device when the first operating element is operated.

[0051] Figure 5 Show Figure 1 A control device when the second operating element is operated.

[0052] Figure 6 Show Figure 1 A control device immediately following actuation of the first operating element and the second operating element.

[0053] Figure 7 Show Figure 1 A control device when the first operating element and the second operating element are released.

[0054] Figure 8 Show Figure 1 An exemplary implementation of a first switching unit of a control device in.

[0055] Fig. 9 Show Figure 1 An exemplary implementation of a second switching unit of a control device in.

[0056] Fig.10 Show Figure 1 An exemplary implementation of a third switching unit of a control device in .

[0057] The drawings are only schematic and not true to scale. The same reference numerals in the various figures denote identical or identically acting features. DETAILED DESCRIPTION

[0058] Figure 1By way of example, an elevator system 100 is shown having a travel basket 102, which can be moved up and down by a drive 104. The drive 104 is supplied with power via a rectifier 106, for example a frequency converter. In addition, the elevator system 100 has a braking device 108, which serves to mechanically brake the travel basket 102 to a standstill and to keep it in the standstill state in the event of a fault or under certain operating conditions that deviate from normal operation.

[0059] In order to be able to move the travel basket 102 during the inspection operation of the elevator system 100, the elevator system 100 has an inspection control 110. The operator 112 can switch the elevator system 100 to the inspection operation by means of the inspection control 110. At this time or when a shaft door 114 is opened, through which the operator 112 can access the elevator shaft 116 of the elevator system 100, the safety circuit of the elevator system 100 and thus also the power supply of the drive 104 are interrupted. When the safety circuit is interrupted, the brake device 108 is also activated.

[0060] The inspection controller 110 includes a first operating element PB1 for releasing the travel movement and a second operating element PB2 for specifying the direction of the travel movement (i.e., upward or downward). The first operating element PB1 and the second operating element PB2 must be simultaneously maintained in their respective operating positions by the operator 112 so that the travel basket 102 moves upward or downward.

[0061] Figure 2 Shown including Figure 1 The control device 200 is designed to close the check circuit 202 when the two operating elements PB1 and PB2 are operated accordingly, and to interrupt the closing of the check circuit when at least one of the two operating elements PB1 and PB2 is released. Figure 1 The series circuits of the safety contacts 204 in the safety circuit 206 mentioned are connected in parallel. During the test operation, at least one safety contact 204 is open. The function of the control device 200 is explained in more detail below.

[0062] The control device 200 includes a first switch unit K1, a second switch unit K2 and a third switch unit K3 connected in parallel to each other. Each of the three switch units K1, K2 and K3 is designed with three contacts, two of which are used as closing points and one contact is used as a disconnection point. These contacts can be designed as mechanical contacts or semiconductor contacts. The switch logic of the control device 200 is described below by taking three electromechanical relays as an example. However, the switch logic can also be implemented equally well with, for example, a programmable electronic system. In order to ensure the safety of the elevator installation, the relay or the electronic system can be constructed using suitable electrical and / or electronic structural elements to meet high safety standards, such as the SIL3 standard (Safety Integrity Level).

[0063] The first switch unit K1 has a first coil S1 and three contacts K1-1, K1-2 and K1-3, which can be opened and closed by the first coil S1. The contacts K1-1 and K1-3 are respectively designed as closing points, and the contact K1-2 is designed as an opening point. In addition, the first switch unit K1 has a first delay element C1 connected in parallel with the first coil S1, which is a first capacitor C1 here.

[0064] The second switch unit K2 has a second coil S2 and three contacts K2-1, K2-2 and K2-3, which can be opened and closed by the second coil S2. The contacts K2-1 and K2-3 are respectively designed as closing points, and the contact K2-2 is designed as an opening point. In addition, the second switch unit 210 has a second delay element C2 connected in parallel with the second coil S2, which is a second capacitor C2 here.

[0065] The third switch unit K3 has a third coil S3 and three contacts K3-1, K3-2 and K3-3, and the three contacts can be opened and closed by the third coil S3. The contacts K3-1 and K3-2 are respectively designed as closing points, and the contact K3-3 is designed as an opening point. In addition, the third switch unit K3 has a third delay element C3 connected in parallel with the third coil S3, which is a third capacitor C3 here.

[0066] K3 and C3 are provided to ensure that K1-3 and K2-3 are closed only when PB1 and PB2 are pushed within a time period determined by the specification of C3.

[0067] The three delay elements C1 , C2 , C3 can also be implemented in other ways, for example as RC elements or diodes or as software modules.

[0068] The three contacts K1-3, K2-3, K3-3 are connected in series in the test line 202. If all three contacts K1-3, K2-3, K3-3 are closed, the open safety contact 204 is bridged in the safety circuit 206. The remaining contacts of the control device 200 are interconnected as follows.

[0069] The first coil S1 has a first control connection A1, here a first coil connection A1, which can be connected to an energy source 208 for providing electrical energy, here a current source, via a first operating element PB1. The first operating element PB1 is connected in series with the first coil S1. In addition, a contact K1-1 is connected between the first operating element PB1 and the first coil connection A1. The contact K3-2 is connected in parallel with the contact K1-1. In this case, the contact K3-2 is located in a first bridge line 210, which connects the first coil connection A1 to the line segment that connects the contact K1-1 to the first operating element PB1. In addition, a first capacitor C1 is connected to the first coil connection A1, so that when the first coil connection A1 is connected to the energy source 208, the first capacitor C1 is charged, and on the other hand, when the first coil connection A1 is disconnected from the energy source 208, a current is supplied to the first coil S1 for a limited period of time depending on the capacitance and the charging state.

[0070] Similarly, the second coil S2 has a second coil connection A2, which can be connected to the energy source 208 via the second operating element PB2. The second operating element PB2 is connected in series with the second coil S2. In addition, the contact K2-1 is connected between the second operating element PB2 and the second coil connection A2. The contact K3-1 is connected in parallel with the contact K2-1. Here, the contact K3-1 is located in the second bridge line 212, which connects the second coil connection A2 to the line segment connecting the contact K2-1 to the second operating element PB2. The second capacitor C2 is also connected to the second coil connection A2, so that when the second coil connection A2 is connected to the energy source 208, the second capacitor C2 is charged, and on the other hand, when the second coil connection A2 is separated from the energy source 208, the second coil S2 is supplied with current according to the capacitance and the charging state.

[0071] On the contrary, the third coil connection terminal A3 of the third coil S3 can be connected to the energy source 208 through two contacts K1-2 and K2-2, and the two contacts K1-2 and K2-2 are connected in series with each other. Therefore, once one of the two contacts K1-2 and K2-2 is disconnected, the third coil connection terminal A3 is separated from the energy source 208, and only when both contacts K1-2 and K2-2 are closed, the current is supplied by the energy source 208. The third capacitor C3 is also connected to the third coil connection terminal A3, so that the third capacitor C3 is charged when the third coil connection terminal A3 is connected to the energy source 208. On the other hand, when the third coil connection terminal A3 is separated from the energy source 208, the current is supplied to the third coil S3 according to the capacitance and the charging state.

[0072] Furthermore, the control device 200 comprises a first feedback line FB1 having a first feedback contact 214 and a second feedback line FB2 having a second feedback contact 216. For example, the two feedback lines FB1, FB2 can be connected to a programmable elevator controller of the elevator device 100. The first feedback contact 214 is forcibly guided to the first operating element PB1, so that once the operator 112 operates the first operating element PB1, the first feedback contact 214 is closed, and once the operator 112 releases the first operating element PB1, the first feedback contact is opened again. The second feedback contact 216 is forcibly guided to the second operating element PB2 in a similar manner.

[0073] By closing or opening the two feedback lines FB1 , FB2 in this way, the elevator control can directly determine the respective current switching state of the two operating elements PB1 , PB2 and can control the rectifier 106 in a corresponding manner.

[0074] Figure 2 The control device 200 is shown in the off state, wherein the control device 200 is disconnected from the energy source 208, the three capacitors C1, C2, C3 are discharged and the two operating elements PB1, PB2 are in the inactive position. Therefore, the contacts K1-1, K1-3, K2-1, K2-3, K3-1, K3-2 designed as closing points are open, while the contacts K1-2, K2-2, K3-3 designed as opening points are closed.

[0075] Figure 3 The control device 200 is shown in the switched-on state, wherein Figure 2The difference is that the control device 200 is connected to the energy source 208. In this case, the third coil connection A3 is powered via the two closed contacts K1-2, K2-2, so that the third capacitor C3 is charged and the third coil S3 is attracted. As a result, the contact K3-1 in the first bridge circuit 210 and the contact K3-2 in the second bridge circuit 212 are closed, while the contact K3-3 in the test circuit 202 is open. The two operating elements PB1, PB2 are still in their respective inactive positions here, so that the first coil connection A1 and the second coil connection A2 are both disconnected from the energy source 208.

[0076] If Figure 4 As shown, the first operating element PB1 is now operated, and current flows to the first coil connection A1 through the closed first bridge circuit 210, so that the first capacitor C1 is charged and the first coil S1 is attracted. As a result, the contact K1-1 between the first coil connection A1 and the first operating element PB1 and the contact K1-3 in the test circuit 202 are closed, while the contact K1-2 between the third coil connection A3 and the energy source 208 is disconnected. Therefore, the third coil connection A3 is separated from the energy source 208. The power supply of the third coil S3 is maintained for a limited period of time through the third capacitor C3 that is charged at the same time. As long as the third coil S3 is supplied with current, the contact K3-3 located in the test circuit 202 remains disconnected.

[0077] For example, if the third switching unit K3 is blocked for some reason, so that the contacts K3-1, K3-2, K3-3 remain in the deactivated position, the two control terminals A1, A2 can no longer be connected to the energy source 208, despite the current flowing through the third coil S3. This ensures that when the third switching unit K3 is faulty, the two switching units K1, K2 remain in their respective deactivated positions, despite the operation of the respective operating elements PB1, PB2, and thus the check line 202 is not closed.

[0078] Figure 5The switch state of the control device 200 is shown when the second operating element PB2 is operated in addition to the first operating element PB1. In this case, similar to the first switching element K1, the current flows to the second coil connection A2 through the closed second bridge line 212, so that the second capacitor C2 is charged and the second coil S2 is attracted. As a result, the contact K2-1 between the second coil connection A2 and the second operating element PB2 and the contact K2-3 in the test line 202 are closed, while the contact K2-2 between the third coil connection A3 and the energy source 208 is open. At the time when the second operating element PB2 is operated, the third coil S3 is still sufficiently supplied with current through the third capacitor C3, so that the contact K3-3 located in the test line 202 is still open, and the contacts K3-1 and K3-2 are still closed.

[0079] Once the third capacitor C3 is discharged, the third coil S3 falls, and the contact K3-3 and thus the test line 202 are closed. At the same time, the contacts K3-1 and K3-2 are opened. Figure 6 Shown in.

[0080] If Figure 7 As shown, the two actuating elements PB1 , PB2 are now released again, so that the two coil connections A1 , A2 are each disconnected from the energy source 208 , but continue to be temporarily supplied with current via the respective capacitors C1 , C2 .

[0081] Only when the two capacitors C1 and C2 are discharged, the two coils S1 and S2 are disconnected, so that the contacts K1-1, K1-3, K2-1, and K2-3 are disconnected again, and the contacts K1-2 and K2-2 are closed again. Correspondingly, the third coil connection A3 is now also supplied with current again, so that the third capacitor C3 is charged again and the third coil S3 is attracted again. The control device 200 is therefore in a state of Figure 3 The switch status is shown.

[0082] Figures 2 to 7 The switch structure of the control device 200 shown in FIG. 1 allows the elevator controller to directly learn the release of the first operating element PB1 or the second operating element PB2 through the first feedback line FB1 or the second feedback line FB2, but the safety circuit 206 is disconnected with a delay based on the reaction time of the first switch unit K1 or the second switch unit K2, and the reaction time depends on the capacitance of the first capacitor C1 or the second capacitor C2. Therefore, before the brake device 108 is operated in response to the interruption of the safety circuit 206, the elevator controller can stop the travel basket 102 in a controlled manner in advance by appropriately controlling the rectifier 106.

[0083] Figure 8An exemplary embodiment of the first switch unit K1 as a relay in the deactivated position is shown. It can be clearly seen at a glance which contacts are used as closing points and which contacts are used as disconnection points. The first coil S1, the first capacitor C1 connected in parallel with the first coil, the armature 800 and the three contacts K1-1, K1-2, K1-3 are shown. The armature (here taking the pulling armature as an example) can be electromagnetically moved between the deactivated position and the operating position by the coil S1, and the contacts are respectively mechanically connected to the armature 800 and thus forced to be guided.

[0084] Fig. 9 An exemplary embodiment of the second switching unit K2 as a relay in the deactivated position is schematically shown.

[0085] Fig.10 An exemplary embodiment of the third switching unit K3 as a relay in the deactivated position is schematically shown.

[0086] The switching units K2 , K3 are each designed similarly to the first switching unit K1 .

[0087] Finally, it is pointed out that terms such as "having", "comprising" etc. do not exclude other elements or steps, and terms such as "a" or "an" etc. do not exclude a plurality. Furthermore, it is pointed out that features or steps that have been described with reference to one of the above embodiments may also be used in combination with other features or steps of other embodiments described above. Any reference signs in the claims should not be interpreted as limiting.

Claims

1. A control device (200) for controlling an elevator system (100) in a test run, the elevator system (100) comprising a safety circuit (206), the safety circuit (206) comprising at least one safety contact (204) which is opened in the test run, and the elevator system (100) comprising a test line (202) for bridging at least one safety contact (204), wherein: The control device (200) comprises: A first operating element (PB1) for operating the elevator system (100) in a test run; A second operating element (PB2) for operating the elevator system (100) in a test run; a first switch unit (K1), the first switch unit having a first contact (K1-3) and a first delay element (C1), the first switch unit being configured to close the first contact (K1-3) in response to operation of the first operating element (PB1) and to open in response to release of the first operating element (PB1); wherein the first delay element (C1) is designed to delay the opening of the first contact (K1-3) by a defined first delay time after the first operating element (PB1) is released; a second switch unit (K2), the second switch unit being connected in parallel with the first switch unit (K1), the second switch unit having a second contact (K2-3) and a second delay element (C2), and the second switch unit being designed to close the second contact (K2-3) in response to the operation of the second operating element (PB2) and to open in response to the release of the second operating element (PB2); wherein the second delay element (C2) is designed to delay the opening of the second contact (K2-3) by a defined second delay time after the second operating element (PB2) is released; The first contact (K1-3) and the second contact (K2-3) are connected in series in the inspection circuit (202).

2. The control device (200) according to claim 1, wherein: The elevator system (100) comprises at least one traveling basket (102), a drive (104) for driving the at least one traveling basket (102), a rectifier (106) for regulating the power supply of the drive (104), and a braking device (108) which can be activated by interrupting a safety circuit (206) for braking the at least one traveling basket (102); The first delay time and the second delay time are each selected such that the at least one travel basket (102) can be stopped by regulating the power supply of the drive (104) before the brake device (108) is activated.

3. The control device (200) according to claim 1 or 2, wherein: The first delay time and the second delay time are both greater than 10 ms.

4. The control device (200) according to claim 1 or 2, further comprising: a third switch unit (K3), the third switch unit being connected in parallel with the first switch unit (K1) and the second switch unit (K2), the third switch unit having a third contact (K3-3) and a third delay element (C3), the third switch unit being designed to close the third contact (K3-3) in response to operation of the first operating element (PB1) and / or the second operating element (PB2), and to open in response to release of the first operating element (PB1) and the second operating element (PB2); wherein the third delay element (C3) is designed to delay the closing of the third contact (K3-3) by a defined third delay time after the first operating element (PB1) and / or the second operating element (PB2) is operated; The third contact (K3-3) is connected in series with the first contact (K1-3) and the second contact (K2-3) in the inspection line (202).

5. The control device (200) according to claim 4, wherein: The third switching unit (K3) is designed to prevent at least one of the three contacts (K1-3, K2-3, K3-3) in the test line (202) from closing when the third switching unit (K3) fails.

6. The control device (200) according to claim 4, wherein: The first switch unit (K1) has a first control connection (A1), and the first switch unit is designed to close the first contact (K1-3) when a control signal is applied to the first control connection (A1), and to open the first contact (K1-3) when no control signal is applied to the first control connection (A1); The first operating element (PB1) is designed to connect the first control connection end (A1) to the signal source (208) in the operating position to provide a control signal, and to disconnect the first control connection end from the signal source (208) in the deactivation position; The first delay element (C1) is designed to delay the falling edge of the control signal at the first control connection (A1) by a first delay time when the first control connection (A1) is disconnected from the signal source (208).

7. The control device (200) according to claim 6, wherein: The second switching unit (K2) has a second control connection (A2) and is designed to close the second contact (K2-3) when a control signal is present at the second control connection (A2) and to open the second contact (K2-3) when no control signal is present at the second control connection (A2); The second operating element (PB2) is designed to connect the second control connection end (A2) to the signal source (208) in the operating position to provide a control signal, and to disconnect the second control connection end from the signal source (208) in the deactivation position; The second delay element (C2) is designed to delay the falling edge of the control signal at the second control terminal (A2) by a second delay time when the second control terminal (A2) is disconnected from the signal source (208).

8. The control device (200) according to claim 7, wherein: The first switching unit (K1) has a fourth contact (K1-2) and is designed to open the fourth contact (K1-2) when a control signal is present at the first control connection (A1) and to close the fourth contact when no control signal is present at the first control connection (A1); The second switching unit (K2) has a fifth contact (K2-2) and is designed to open the fifth contact (K2-2) when a control signal is present at the second control connection (A2) and to close the fifth contact when no control signal is present at the second control connection (A2); The third switching unit (K3) has a third control terminal (A3) and is designed to open a third contact (K3-3) when a control signal is applied to the third control terminal (A3) and to close the third contact when no control signal is applied to the third control terminal (A3); The third delay element (C3) is designed to delay the falling edge of the control signal at the third control terminal (A3) by a third delay time when the third control terminal (A3) is disconnected from a signal source (208) for providing the control signal; The third control connection terminal (A3) can be connected to a signal source (208) via a fourth contact (K1-2) and a fifth contact (K2-2); The fourth contact (K1-2) and the fifth contact (K2-2) are connected in series.

9. The control device (200) according to claim 8, wherein: The first switching unit (K1) has a sixth contact (K1-1) and is designed to close the sixth contact (K1-1) when a control signal is present at the first control connection (A1) and to open the sixth contact when no control signal is present at the first control connection (A1); The third switching unit (K3) has a seventh contact (K3-2) and is designed to close the seventh contact (K3-2) when a control signal is applied to the third control terminal (A3) and to open the seventh contact when no control signal is applied to the third control terminal (A3); The sixth contact (K1-1) is connected between the first operating element (PB1) and the first control connection terminal (A1); The seventh contact (K3-2) is arranged in a first bridging line (210) bridging the sixth contact (K1-1).

10. The control device (200) according to claim 9, wherein: The second switching unit (K2) has an eighth contact (K2-1) and is designed to close the eighth contact (K2-1) when a control signal is present at the second control connection (A2) and to open the eighth contact when no control signal is present at the second control connection (A2); The third switching unit (K3) has a ninth contact (K3-1) and is designed to close the ninth contact (K3-1) when a control signal is present at the second control terminal (A2) and to open the ninth contact when no control signal is present at the third control terminal (A3); The eighth contact (K2-1) is connected between the second operating element (PB2) and the second control connection terminal (A2); The ninth contact (K3-1) is arranged in a second bridging line (212) bridging the eighth contact (K2-1).

11. The control device (200) according to claim 4, wherein: The first switching unit (K1) is designed as a first electromechanical relay; and / or The second switching unit (K2) is designed as a second electromechanical relay; and / or The third switching unit ( K3 ) is designed as a third electromechanical relay.

12. The control device (200) according to claim 11, wherein: The first delay element (C1) comprises a capacitor connected in parallel with the coil (S1) of the first relay; and / or The second delay element (C2) comprises a capacitor connected in parallel with the coil (S2) of the second relay; and / or The third delay element (C3) includes a capacitor connected in parallel with the coil (S3) of the third relay.

13. An elevator device (100), comprising: A safety circuit (206) having at least one safety contact (204), wherein the at least one safety contact is disconnected when the elevator device (100) is in an inspection operation; A check circuit (202) for bridging at least one safety contact (204); and A control device (200) according to any one of the preceding claims.

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