Elevator earthquake sensor activation detection system

The system enhances elevator recovery efficiency by using sensors and a display to indicate the earthquake sensor's location, eliminating the need for manual sensor checks during maintenance.

JP7840356B2Active Publication Date: 2026-04-03MITSUBISHI ELECTRIC BUILDING SOLUTIONS CORP
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Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
Filing Date
2024-04-18
Publication Date
2026-04-03

AI Technical Summary

Technical Problem

Maintenance workers need to physically visit multiple seismic sensors to determine which detected an earthquake, leading to inefficient elevator recovery work.

Method used

An elevator earthquake sensor operation location detection system that includes multiple sensors in different locations (hoistway pit, central hoistway, and machine room) with a display device and control panel to show the sensor's location of detection.

Benefits of technology

Improves the efficiency of elevator restoration by allowing maintenance workers to identify sensor locations remotely, reducing the need for physical visits.

✦ Generated by Eureka AI based on patent content.

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Patent Text Reader

Abstract

To provide an elevator earthquake detector activation location detection system that can improve the efficiency of elevator restoration work.SOLUTION: The elevator earthquake sensor activation location detection system comprises an earthquake sensor 7 installed in a pit 11a of an elevator shaft 11, an earthquake sensor 8 installed in a vertical center portion 11b of the elevator shaft 11, an earthquake sensor 9 installed in a machine room 12, a display device 14, and an elevator control panel 6 that controls the display on the display device 14. Based on the detection results of the earthquake sensor 7, the earthquake sensor 8, and the earthquake sensor 9, the elevator control panel 6 displays detection position information on the display device 14, which is information that identifies the position where the earthquake sensor that detected the occurrence of an earthquake is installed among the earthquake sensor 7, the earthquake sensor 8, and the earthquake sensor 9.SELECTED DRAWING: Figure 2
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Description

Technical Field

[0001] The present disclosure relates to an elevator earthquake sensor operation location detection system.

Background Art

[0002] Conventionally, an elevator is known that includes a seismic sensor provided in a hoistway pit, a seismic sensor provided in a machine room, and an elevator control panel that controls the movement of a car based on the detection results of each seismic sensor. Each seismic sensor is provided with a reset button. When a maintenance worker performs elevator recovery, the maintenance worker operates the reset button of the seismic sensor that detected the occurrence of an earthquake. As a result, the seismic sensor that detected the occurrence of an earthquake is reset, and the car can move up and down (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] The present disclosure has been made to solve the above-described problems, and an object thereof is to provide an elevator earthquake sensor operation location detection system that can improve the work efficiency of elevator recovery.

Means for Solving the Problems

[0006] The elevator earthquake sensor operation location detection system according to this disclosure comprises a plurality of earthquake sensors, one each provided in at least two of the following locations: the pit of the hoistway, the central part of the hoistway in the height direction, and the machine room; a display device; and an elevator control panel that controls the display of the display device. The elevator control panel causes the display device to display detection location information, which is information that identifies the location of the earthquake sensor that detected the occurrence of an earthquake among the plurality of earthquake sensors, based on the detection results of each of the plurality of earthquake sensors. [Effects of the Invention]

[0007] The elevator earthquake sensor activation detection system described in this disclosure can improve the efficiency of elevator restoration work. [Brief explanation of the drawing]

[0008] [Figure 1] This is a configuration diagram showing an elevator equipped with an elevator seismic sensor operation location detection system according to Embodiment 1. [Figure 2] This is a block diagram showing the main parts of the elevator in Figure 1. [Figure 3] This figure shows the display of the boarding indicator in Figure 2. [Figure 4] This figure shows the display of the boarding indicator in Figure 2. [Figure 5] This figure shows the display of the boarding indicator in Figure 2. [Figure 6] Figure 2 shows how the boarding indicator displays detected location information. [Figure 7] Figure 2 shows how the boarding indicator displays detected location information. [Figure 8] Figure 2 shows how the boarding indicator displays detected location information. [Modes for carrying out the invention]

[0009] Embodiment 1. Figure 1 is a diagram showing the configuration of an elevator equipped with an earthquake sensor operation location detection system according to Embodiment 1. Figure 2 is a block diagram showing the main parts of the elevator in Figure 1. The elevator comprises a car 1, a counterweight 2, a rope 3, a hoisting machine 4, a deflector 5, an elevator control panel 6, an earthquake sensor 7, an earthquake sensor 8, an earthquake sensor 9, and a plurality of landing devices 10.

[0010] The elevator car 1 and counterweight 2 are installed in the elevator shaft 11. One longitudinal end of the rope 3 is connected to the elevator car 1, and the other longitudinal end of the rope 3 is connected to the counterweight 2.

[0011] The elevator car 1 comprises a car body 1a, a car door 1b, and an in-car indicator 1c. Users enter and exit the car body 1a. The car body 1a has a car entrance / exit 1d through which users pass. The car door 1b is installed on the car body 1a. The car door 1b opens and closes the car entrance / exit 1d. The in-car indicator 1c is installed on the car body 1a. The opening and closing of the car entrance / exit 10d by the car door 1b and the display of the in-car indicator 1c are controlled by the elevator control panel 6.

[0012] The hoisting machine 4 and the deflector wheel 5 are located in the machine room 12. The longitudinal middle section of the rope 3 is wrapped around the hoisting machine 4 and the deflector wheel 5. When the hoisting machine 4 is driven, the rope 3 moves, causing the car 1 and the counterweight 2 to move up and down the hoistway 11 in opposite directions. The driving of the hoisting machine 4 is controlled by the elevator control panel 6.

[0013] The elevator control panel 6 is located in the machine room 12. However, the elevator control panel 6 is not limited to the machine room 12; for example, it may be located in the hoistway 11.

[0014] The earthquake sensor 7 is provided in the pit 11a of the hoistway 11. The earthquake sensor 7 detects the occurrence of an earthquake in the pit 11a. The earthquake sensor 7 has an acceleration sensor. When the measurement result of the acceleration sensor exceeds a preset value, the earthquake sensor 7 determines that an earthquake has occurred in the pit 11a. The detection result of the earthquake sensor 7 and the measurement result of the acceleration sensor are output from the earthquake sensor 7 and input to the elevator control panel 6.

[0015] The earthquake sensor 8 is provided in the central part 11b in the height direction of the hoistway 11. The earthquake sensor 8 detects the occurrence of an earthquake in the central part 11b. The earthquake sensor 8 has an acceleration sensor. When the measurement result of the acceleration sensor exceeds a preset value, the earthquake sensor 8 determines that an earthquake has occurred in the central part 11b. The detection result of the earthquake sensor 8 and the measurement result of the acceleration sensor are output from the earthquake sensor 8 and input to the elevator control panel 6.

[0016] The earthquake sensor 9 is provided in the machine room 12. The earthquake sensor 9 detects the occurrence of an earthquake in the machine room 12. The earthquake sensor 9 has an acceleration sensor. When the measurement result of the acceleration sensor exceeds a preset value, the earthquake sensor 9 determines that an earthquake has occurred in the machine room 12. The detection result of the earthquake sensor 9 and the measurement result of the acceleration sensor are output from the earthquake sensor 9 and input to the elevator control panel 6.

[0017] A plurality of landing devices 10 are provided one by one at each of the plurality of landings 13. A landing entrance 13a through which users pass is formed at each landing 13. The landing device 10 includes a landing door 10a and a landing indicator 10b. The landing door 10a opens and closes the landing entrance 13a of the corresponding landing 13. The opening and closing of the landing entrance 13a by the landing door 10a is performed in conjunction with the opening and closing of the car door 1b by the car door 1b. The display of each landing indicator 10b is controlled by the elevator control panel 6.

[0018] The display device 14 is composed of the car indicator 1c and a plurality of landing indicators 10b.

[0019] The earthquake detector operation location detection system of the elevator according to Embodiment 1 is composed of earthquake detectors 7, 8, 9, a display device 14, and an elevator control panel 6.

[0020] FIG. 3 is a diagram showing the display state of the landing indicator 10b in FIG. 2. FIG. 3 shows the display state of the landing indicator 10b when only the earthquake detector 7 among the earthquake detectors 7, 8, and 9 detects the occurrence of an earthquake.

[0021] Information indicating that the elevator is stopped due to the occurrence of an earthquake is defined as earthquake stop information. Information specifying the position where the earthquake detector that has detected the occurrence of an earthquake among the earthquake detectors 7, 8, and 9 is provided is defined as detection position information. Information specifying the floor where the car 1 is located is defined as car position information.

[0022] When the elevator is stopped due to the occurrence of an earthquake, the elevator control panel 6 causes the landing indicator 10b to display the earthquake stop information, the detection position information, and the car position information. The landing indicator 10b has a plurality of light-emitting parts. When some of the plurality of light-emitting parts emit light, the landing indicator 10b displays the earthquake stop information, the detection position information, and the car position information.

[0023] FIG. 3(a) shows the state in which the landing indicator 10b displays the earthquake stop information. When the landing indicator 10b displays the earthquake stop information, the elevator control panel 6 causes some of the plurality of light-emitting parts to emit light so that "E" is displayed on the landing indicator 10b.

[0024] Figure 3(b) shows how the landing indicator 10b displays detected position information. Some of the multiple light-emitting units correspond to earthquake sensors 7, 8, and 9, one each. Specifically, three of the multiple light-emitting units correspond to earthquake sensors 7, 8, and 9, one each. Of the three light-emitting units, the one corresponding to earthquake sensor 7 is designated as the first light-emitting unit 15a, the one corresponding to earthquake sensor 8 is designated as the second light-emitting unit 15b, and the one corresponding to earthquake sensor 9 is designated as the third light-emitting unit 15c. The first light-emitting unit 15a, the second light-emitting unit 15b, and the third light-emitting unit 15c are arranged in a line in the height direction.

[0025] When the landing indicator 10b displays detected position information, the elevator control panel 6 illuminates at least one of the three light-emitting units arranged in a vertical line. If only the earthquake sensor 7 among the earthquake sensors 7, 8, and 9 detects the occurrence of an earthquake, the elevator control panel 6 illuminates the first light-emitting unit 15a, which is the lowest of the three light-emitting units arranged in a vertical line. As a result, the landing indicator 10b displays detected position information.

[0026] Figure 3(c) shows how the landing indicator 10b displays car position information. When the landing indicator 10b displays car position information, the elevator control panel 6 illuminates some of the multiple light-emitting parts so that the number indicating the floor where car 1 is located is displayed on the landing indicator 10b. Figure 3(c) shows how the landing indicator 10b displays car position information when car 1 is on the 3rd floor.

[0027] The elevator control panel 6 sequentially switches between displaying earthquake shutdown information, detected location information, and car location information on the landing indicator 10b.

[0028] Figure 4 shows the display of the landing indicator 10b in Figure 2. Figure 4 shows the display of the landing indicator 10b when only earthquake sensor 8 detects the occurrence of an earthquake among earthquake sensors 7, 8, and 9.

[0029] Figure 4(a) shows the platform indicator 10b displaying earthquake-related suspension information, similar to Figure 3(a).

[0030] Figure 4(b) shows how the landing indicator 10b displays the detected location information. If only earthquake sensor 8 detects an earthquake among earthquake sensors 7, 8, and 9, the elevator control panel 6 illuminates the second light-emitting unit 15b, which is the central light-emitting unit among the three light-emitting units arranged in a vertical line. As a result, the landing indicator 10b displays the detected location information.

[0031] Figure 4(c) shows how the landing indicator 10b displays the elevator car position information, similar to Figure 3(c).

[0032] Figure 5 shows the display of the landing indicator 10b in Figure 2. Figure 5 shows the display of the landing indicator 10b when only earthquake sensor 9 detects the occurrence of an earthquake among earthquake sensors 7, 8, and 9.

[0033] Figure 5(a) shows the platform indicator 10b displaying earthquake-related suspension information, similar to Figure 3(a).

[0034] Figure 5(b) shows how the landing indicator 10b displays the detected location information. If only earthquake sensor 9 detects an earthquake among earthquake sensors 7, 8, and 9, the elevator control panel 6 illuminates the third light-emitting unit 15c, which is the uppermost of the three light-emitting units arranged in a vertical line. As a result, the landing indicator 10b displays the detected location information.

[0035] Figure 5(c) shows how the landing indicator 10b displays the elevator car position information, similar to Figure 3(c).

[0036] Figure 6 shows how the landing indicator 10b in Figure 2 displays detected location information. Figure 6 shows how the landing indicator 10b is displayed when earthquake sensors 7 and 8, among earthquake sensors 7, 8, and 9, detect the occurrence of an earthquake.

[0037] If earthquake sensors 7 and 8 detect the occurrence of an earthquake, the elevator control panel 6 will illuminate the first light-emitting unit 15a and the second light-emitting unit 15b.

[0038] Figure 7 shows how the landing indicator 10b in Figure 2 displays detected location information. Figure 7 shows how the landing indicator 10b is displayed when earthquake sensors 8 and 9, among earthquake sensors 7, 8, and 9, detect the occurrence of an earthquake.

[0039] If earthquake sensors 8 and 9 detect the occurrence of an earthquake, the elevator control panel 6 will illuminate the second light-emitting unit 15b and the third light-emitting unit 15c.

[0040] Figure 8 shows how the landing indicator 10b in Figure 2 displays detected location information. Figure 8 shows how the landing indicator 10b is displayed when earthquake sensors 7 and 9, among earthquake sensors 7, 8, and 9, detect the occurrence of an earthquake.

[0041] If earthquake sensors 7 and 9 detect the occurrence of an earthquake, the elevator control panel 6 will illuminate the first light-emitting unit 15a and the third light-emitting unit 15c.

[0042] Although not shown in the diagram, if all of the earthquake sensors 7, 8, and 9 detect the occurrence of an earthquake, the elevator control panel 6 will illuminate the first light-emitting unit 15a, the second light-emitting unit 15b, and the third light-emitting unit 15c.

[0043] Although not shown in the diagram, the elevator control panel 6, like the landing indicator 10b, displays earthquake shutdown information, detected location information, and car location information on the in-car indicator 1c when the elevator is shut down due to an earthquake.

[0044] Next, the procedure for maintenance personnel to perform elevator restoration work using the elevator earthquake sensor operation detection system according to Embodiment 1 will be described. First, when an earthquake occurs and at least one of the earthquake sensors 7, 8, and 9 detects the occurrence of an earthquake, the elevator control panel 6 stops the car 1 and puts the elevator into a hiatus.

[0045] Subsequently, the elevator control panel 6 displays earthquake suspension information, detection location information, and car position information on the landing indicator 10b and the in-car indicator 1c, based on the detection results of the earthquake sensors 7, 8, and 9, respectively.

[0046] The maintenance worker visually checks the detection location information displayed on the landing indicator 10b or the car indicator 1c to determine the location of the earthquake sensor that detected the earthquake. Then, the maintenance worker moves to the location of the earthquake sensor that detected the earthquake and operates the reset button on the earthquake sensor. This resets the earthquake sensor that detected the earthquake, allowing car 1 to move.

[0047] Afterward, the maintenance workers begin the elevator restoration work while moving car 1. The elevator is restored once all restoration work is completed.

[0048] As described above, the elevator earthquake sensor operation location detection system according to Embodiment 1 comprises earthquake sensors 7, 8, and 9, a display device 14, and an elevator control panel 6. Earthquake sensor 7 is installed in the pit 11a of the hoistway 11. Earthquake sensor 8 is installed in the central part 11b in the height direction of the hoistway 11. Earthquake sensor 9 is installed in the machine room 12. The elevator control panel 6 controls the display of the display device 14. The elevator control panel 6 displays detection location information on the display device 14 based on the detection results of earthquake sensors 7, 8, and 9. With this configuration, maintenance personnel can determine which of the earthquake sensors 7, 8, and 9 has detected an earthquake by visually checking the display device 14. This eliminates the need for maintenance personnel to go to the areas where each of the earthquake sensors 7, 8, and 9 is installed. As a result, the efficiency of elevator restoration work can be improved.

[0049] Furthermore, in the elevator earthquake sensor operation location detection system according to Embodiment 1, the elevator control panel 6 switches between displaying car position information and detection position information on the display device 14 when the car 1 stops due to at least one of the earthquake sensors 7, 8, and 9 detecting the occurrence of an earthquake. With this configuration, even if the display device 14 is small in size, the display device 14 can display car position information and detection position information. As a result, even if the display device 14 is small in size, maintenance personnel can be informed of the floor on which the car 1 is located and the location where the earthquake sensor that detected the occurrence of the earthquake is installed.

[0050] Furthermore, in the elevator earthquake sensor operation location detection system according to Embodiment 1, the display device 14 has multiple light-emitting units, one for each of the earthquake sensors 7, 8, and 9. The multiple light-emitting units are arranged in a line in the height direction. The elevator control panel 6 displays the detection location information on the display device 14 by lighting up the light-emitting unit corresponding to the earthquake sensor that detected the occurrence of an earthquake. With this configuration, the location of the earthquake sensor that detected the occurrence of an earthquake can be easily communicated to maintenance personnel.

[0051] Furthermore, in the elevator earthquake sensor operation location detection system according to Embodiment 1, the display device 14 has a landing indicator 10b installed at the landing 13. The elevator control panel 6 displays the car position information on the landing indicator 10b when none of the earthquake sensors 7, 8, and 9 have detected an earthquake. Also, when at least one of the earthquake sensors 7, 8, and 9 has detected an earthquake, the elevator control panel 6 switches between displaying the detected position information and the car position information on the landing indicator 10b. With this configuration, maintenance personnel can visually check the landing indicator 10b to inform them of the floor where the car 1 is located and the location of the earthquake sensor that detected the earthquake.

[0052] Furthermore, in the elevator earthquake sensor operation location detection system according to Embodiment 1, the display device 14 has an in-car indicator 1c installed in the car 1. The elevator control panel 6 displays car position information on the in-car indicator 1c when none of the earthquake sensors 7, 8, and 9 have detected an earthquake. Also, when at least one of the earthquake sensors 7, 8, and 9 has detected an earthquake, the elevator control panel 6 alternately displays the detected location information and the car position information on the in-car indicator 1c. With this configuration, maintenance personnel can visually check the in-car indicator 1c to inform them of the floor where the car 1 is located and the location of the earthquake sensor that detected the earthquake.

[0053] In the first embodiment of the elevator seismic sensor operation detection system, a configuration comprising seismic sensors 7, 8, and 9 was described. However, the system is not limited to this configuration. Any configuration comprising at least two of the seismic sensors 7, 8, and 9 is acceptable. In other words, any configuration comprising multiple seismic sensors, one each provided in at least two of the following locations: the pit 11a of the hoistway 11, the central part 11b in the height direction of the hoistway 11, and the machine room 12, is acceptable.

[0054] Furthermore, in the elevator earthquake sensor operation location detection system according to Embodiment 1, a configuration was described in which the display device 14 displays earthquake suspension information, detection location information, and car location information. However, the system is not limited to this configuration. For example, the display device 14 may display detection location information and car location information. Alternatively, the display device 14 may display information indicating the location where the earthquake sensor with the largest measurement result from the acceleration sensor among earthquake sensors 7, 8, and 9 is installed. With this configuration, maintenance personnel can perform recovery work in the area with the strongest earthquake shaking first.

[0055] Furthermore, in the elevator earthquake sensor operation location detection system according to Embodiment 1, a configuration was described in which the display device 14 displays earthquake shutdown information, detection location information, and car location information when the elevator is shut down due to an earthquake. However, the configuration is not limited to this. For example, the display device 14 may display earthquake shutdown information, detection location information, and car location information when the elevator is shut down due to an earthquake, and a maintenance switch provided on the elevator control panel 6 or car 1 is operated.

[0056] Although a preferred embodiment 1 of the elevator earthquake sensor activation detection system has been described above, the elevator earthquake sensor activation detection system is not limited to the embodiment 1 described above. Various modifications and transformations can be made to the elevator earthquake sensor activation detection system according to embodiment 1 described above without departing from the scope of the claims.

[0057] The various aspects of this disclosure are summarized below as an appendix.

[0058] (Note 1) Multiple earthquake sensors are provided, one each in at least two of the following locations: the pit of the elevator shaft, the central part of the elevator shaft in the height direction, and the machine room. Display device and An elevator control panel that controls the display of the aforementioned display device, Equipped with, The elevator control panel is an elevator earthquake sensor operation location detection system that displays detection location information on the display device, which is information that identifies the location of the earthquake sensor that detected the occurrence of an earthquake among the plurality of earthquake sensors, based on the detection results of each of the plurality of earthquake sensors. (Note 2) The elevator seismic sensor operation location detection system for an elevator as described in Appendix 1, wherein when the elevator car stops due to at least one of the plurality of seismic sensors detecting the occurrence of an earthquake, the elevator control panel switches between displaying information identifying the floor where the car is located and the detection location information on the display device. (Note 3) The display device has a plurality of light-emitting units, one for each of the plurality of earthquake sensors. The plurality of light-emitting units are arranged in a line in the height direction, The elevator seismic sensor operation location detection system according to Appendix 1 or Appendix 2, wherein the elevator control panel displays the detection location information on the display device by lighting up the light-emitting unit corresponding to the seismic sensor that has detected the occurrence of an earthquake among the plurality of light-emitting units. (Note 4) The aforementioned display device has a landing indicator installed at the landing, An elevator earthquake sensor operation location detection system according to any one of the appendices 1 to 3, wherein the elevator control panel displays information identifying the floor where the elevator car is located on the landing indicator when none of the plurality of earthquake sensors have detected an earthquake, and switches between displaying the detection location information and the information identifying the floor where the elevator car is located on the landing indicator when at least one of the plurality of earthquake sensors has detected an earthquake. (Note 5) The aforementioned display device has an in-car indicator provided in the cart, An elevator earthquake sensor operation location detection system according to any one of the appendices 1 to 4, wherein the elevator control panel displays information identifying the floor where the elevator car is located on the in-car indicator when none of the multiple earthquake sensors have detected an earthquake, and switches between displaying the detection location information and the information identifying the floor where the elevator car is located on the in-car indicator when at least one of the multiple earthquake sensors has detected an earthquake. [Explanation of Symbols]

[0059] 1 Car, 1a Car body, 1b Car door, 1c In-car indicator, 1d Car entrance / exit, 2 Counterweight, 3 Rope, 4 Hoisting machine, 5 Deflection wheel, 6 Elevator control panel, 7 Earthquake sensor, 8 Earthquake sensor, 9 Earthquake sensor, 10 Landing device, 10a Landing door, 10b Landing indicator, 11 Hoistway, 11a Pit, 11b Central section, 12 Machine room, 13 Landing, 13a Landing entrance / exit, 14 Display device, 15a First light-emitting unit, 15b Second light-emitting unit, 15c Third light-emitting unit.

Claims

1. Multiple earthquake sensors are provided, one each in at least two of the following locations: the pit of the elevator shaft, the central part of the elevator shaft in the height direction, and the machine room. Display device and An elevator control panel that controls the display of the aforementioned display device, Equipped with, The elevator control panel is an elevator earthquake sensor operation location detection system that displays detection location information on the display device, which is information that identifies the location of the earthquake sensor that detected the occurrence of an earthquake among the plurality of earthquake sensors, based on the detection results of each of the plurality of earthquake sensors.

2. The elevator earthquake sensor operation location detection system according to claim 1, wherein the elevator control panel switches between displaying information identifying the floor where the elevator car is located and the detection location information on the display device when the elevator car stops due to at least one of the plurality of earthquake sensors detecting the occurrence of an earthquake.

3. The display device has a plurality of light-emitting units, one for each of the plurality of earthquake sensors, The plurality of light-emitting units are arranged in a line in the height direction, The elevator earthquake sensor operation location detection system according to claim 1 or 2, wherein the elevator control panel displays the detection location information on the display device by lighting up the light-emitting unit corresponding to the earthquake sensor that has detected the occurrence of an earthquake among the plurality of light-emitting units.

4. The aforementioned display device has a landing indicator installed at the landing, The elevator seismic sensor operation location detection system according to claim 1 or 2, wherein the elevator control panel displays information identifying the floor where the elevator car is located on the landing indicator when none of the plurality of seismic sensors have detected an earthquake, and switches between displaying the detection location information and the information identifying the floor where the elevator car is located on the landing indicator when at least one of the plurality of seismic sensors has detected an earthquake.

5. The display device has an in-car indicator provided in the cart, The elevator seismic sensor operation location detection system according to claim 1 or 2, wherein the elevator control panel displays information identifying the floor where the elevator car is located on the in-car indicator when none of the multiple seismic sensors have detected an earthquake, and switches between displaying the detection location information and the information identifying the floor where the elevator car is located on the in-car indicator when at least one of the multiple seismic sensors has detected an earthquake.

Citation Information

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