Elevator system

Abstract

To prevent breakage of related equipment by detecting catching of an APS cord tape of an absolute position positioning system for detecting an absolute position in an early stage when vibration is applied to a hoistway by an earthquake.SOLUTION: An elevator system includes an object to be detected in which an upper end and a lower end of a long body are fixed along a moving direction of a car in a hoistway of an elevator and absolute position information is continuously set corresponding to a position in the moving direction, a detection device installed in the car and configured to read the absolute position information from the object to be detected, a strain detector configured to detect a strain amount in an extending direction of the object to be detected, an earthquake sensor configured to sense an earthquake in the hoistway and output an earthquake sensing signal, and a control device configured to determine presence or absence of a stuck abnormality of the object to be detected based on the strain amount when an occurrence of an earthquake is determined based on the earthquake sensing signal.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present disclosure relates to an elevator system equipped with an absolute positioning system that detects the absolute position of an elevator car. [Background technology]

[0002] Patent Document 1 discloses a technology related to an elevator with a hanging position measuring tape. Changes in the length of the position measuring tape can occur due to temperature changes, aging, or breakage of the position measuring tape. This technology proposes a sensor device that detects significant changes in the length of the position measuring tape. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2021-98607 Summary of the Invention [Problem to be solved by the invention]

[0004] Absolute positioning systems (APS) detect the absolute position of the car by reading information from APS code tapes installed along the entire length of the hoistway with an APS sensor installed in the car. Some APS systems are equipped with guides to restrict the horizontal position of the APS code tape to the sensing range of the APS sensor. This type of APS prevents the APS code tape from shifting horizontally while the car is moving up or down the hoistway.

[0005] However, if an earthquake causes vibrations in the elevator shaft, the APS code tape may get caught on a protrusion in the elevator shaft. If the car runs while the APS code tape is caught, the APS code tape may be damaged or stretched, making it impossible to accurately detect the absolute position. For this reason, elevators equipped with absolute positioning systems are required to detect APS code tape catches early and control the car's operation. The technology in Patent Document 1 determines that the system is normal if the position of the end point of the position measurement tape is within a specified range, so it is not suitable for detecting APS code tape catches caused by an earthquake.

[0006] The present disclosure has been made to solve the above-mentioned problems, and aims to provide a technology for an elevator system that prevents damage to related equipment by early detection of an abnormality in the APS code tape, which is the object to be detected by an absolute positioning system that detects absolute position, when an earthquake causes vibrations in the elevator shaft. [Means for solving the problem]

[0007] The elevator system of the present disclosure comprises a detectable object, the upper and lower ends of which are fixed along the direction of movement of the car in the elevator shaft, and absolute position information is continuously set corresponding to the position in the direction of movement, a detection device installed in the car and reading the absolute position information from the detectable object, a strain detector that detects the amount of strain in the extension direction of the detectable object, an earthquake sensor that senses vibrations in the shaft and outputs an earthquake detection signal, and a control device that, when it determines that an earthquake has occurred based on the earthquake detection signal, determines whether the detectable object has become stuck or not based on the amount of strain. [Effects of the Invention]

[0008] According to the technology disclosed herein, when an elevator shaft is vibrated by an earthquake, it is possible to detect an abnormality in the APS code tape, which is the object to be detected by the absolute positioning system that detects absolute position, at an early stage, thereby making it possible to take measures to prevent damage to related equipment. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a schematic configuration diagram of an elevator system according to an embodiment. [Figure 2] FIG. 2 is a diagram for explaining functional blocks provided in the operation management unit. [Figure 3] FIG. 2 is an activity diagram of processing performed by an operation control unit of the elevator system according to the embodiment. [Figure 4] FIG. 10 is an activity diagram of a catch detection process performed by a catch detection processing unit. [Figure 5] 10 is a diagram for explaining the relationship between the amount of strain of the APS cord tape and the position of the cage. FIG. [Figure 6] FIG. 10 is an activity diagram of evacuation operation processing performed by an evacuation operation processing unit. [Figure 7] FIG. 10 is a diagram illustrating a modification of the hardware resources of the control device. [Figure 8] FIG. 10 is a diagram illustrating another modified example of the hardware resources of the control device. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, an embodiment will be described with reference to the drawings. Note that elements common to the various drawings are given the same reference numerals and redundant explanations will be omitted.

[0011] Embodiment 1. Schematic configuration of an elevator system according to an embodiment Fig. 1 is a schematic diagram of an elevator system according to an embodiment. An elevator of an elevator system 100 according to an embodiment is installed in a facility consisting of a building or the like having multiple floors. An elevator hoistway 2 is provided in the facility. The hoistway 2 is a vertically long space spanning multiple floors.

[0012] The elevator mainly comprises a hoist 3, a main rope 4, a counterweight 5, a control device 10, a car 6, an absolute positioning system 20, an earthquake sensor 40, and a strain detector 42.

[0013] The car 6 is a device that travels up and down in the elevator shaft 2, which is the direction of movement, to transport passengers and the like riding inside the car between a plurality of floors.

[0014] The counterweight 5 moves up and down the hoistway 2. The car 6 and the counterweight 5 are suspended in the hoistway 2 by the main ropes 4.

[0015] The hoisting machine 3 is installed at the top of the hoistway 2. The hoisting machine 3 includes a sheave 32 around which a main rope 4 is wound, and a motor 34 that rotates the sheave 32. When the sheave 32 is rotated by the motor 34, the main rope 4 moves in synchronization with the direction that corresponds to the direction in which the sheave 32 rotates. The car 6 rises or falls in synchronization with the direction in which the main rope 4 moves.

[0016] The absolute positioning system 20 is a system that detects a signal synchronized with the vertical movement of the car 6 in the elevator shaft 2. The absolute positioning system will hereinafter also be referred to as "APS."

[0017] The APS 20 includes an APS code tape 22 as a detection object and an APS sensor 24 as a detection device. The APS code tape 22 is a long body arranged vertically within the hoistway 2. Typically, absolute position information is continuously set on the APS code tape 22 corresponding to the position in the direction of movement within the hoistway 2. The absolute position information is set by continuously varying the magnetic or optical characteristics of the APS code tape 22 from the top to the bottom in the vertical direction. The upper and lower ends of the APS code tape 22 are fixed while applying a tensile force. In addition, a strain detector 42 is installed at the lower end of the APS code tape 22 to detect the amount of strain in the direction of extension of the APS code tape 22.

[0018] The APS sensor 24 is an absolute position sensor for reading absolute position information from the APS code tape 22. The APS sensor 24 is mounted on the car 6 by a bracket so as to face the APS code tape 22. The APS sensor 24 is provided with a guide (not shown) for restricting the horizontal position of the APS code tape 22 within the sensing range of the APS sensor 24.

[0019] The detection method of the APS sensor 24 is, for example, a magnetic method or an optical method, which is capable of reading absolute position information from the APS code tape 22. The APS sensor 24 reads the absolute position information from the APS code tape 22 and transmits the read absolute position information to the operation management unit 12 of the control device 10.

[0020] The earthquake sensor 40 is a device that detects the occurrence of an earthquake, and is installed in the pit 2a at the bottom of the elevator shaft 2. The earthquake sensor 40 transmits an earthquake detection signal according to the magnitude of the earthquake to the operation management unit 12 of the control device 10.

[0021] The strain detector 42 constantly detects the amount of strain in the APS code tape 22 and transmits strain information including the detected amount of strain to the operation management unit 12 of the control device 10.

[0022] The control device 10 corresponds to a control panel that controls the operation of the elevator. The control device 10 includes an operation control unit 12 that mainly manages the operation of the elevator, and a drive unit 14 that mainly controls the drive of the elevator.

[0023] The drive unit 14 is a unit that has the function of controlling the drive and braking of the hoisting machine 3. Drive commands and safety commands are input to the drive unit 14 from the operation management unit 12. Power is supplied to the drive unit 14 from the power supply 8. The power supply 8 is electrically connected to an external commercial power supply. A motor encoder signal is input to the drive unit 14 from a motor encoder (not shown). The drive unit 14 controls the power supplied to the motor 34 of the hoisting machine 3 using an inverter so that the rotation amount of the motor 34 calculated from the motor encoder signal becomes a target value calculated from the drive command.

[0024] The operation control unit 12 is a unit that has the function of managing the safety of elevator operation. FIG. 2 is a diagram for explaining the functional blocks of the operation control unit. The operation control unit 12 has, as functional blocks for executing processes to realize various functions, a car position / speed detection processing unit 121, an earthquake detection processing unit 122, a jamming detection processing unit 123, and an evacuation operation processing unit 124. Below, specific processes performed in the operation control unit 12 will be explained using an activity diagram.

[0025] 2. Specific processes carried out by the operation control unit 3 is an activity diagram of the processing performed by the operation control unit of the elevator system according to the embodiment. In the activity diagram, arrows drawn with dashed lines indicate the flow of control. In the activity diagram, arrows drawn with solid lines indicate the flow of data exchange.

[0026] 3, the traffic management unit 12 starts processing when the power is turned on, and thereafter repeatedly executes the processing for each control period. The traffic management unit 12 then ends the processing when the power is turned off. The traffic management unit 12 performs processing S10, processing S20, processing S30, and processing S40 in parallel.

[0027] 2-1. Process S10: Car position and speed detection process In process S10 shown in Fig. 3, the car position / speed detection processing unit 121 performs car position / speed detection processing. In the car position / speed detection processing, the car position / speed detection processing unit 121 calculates the position and speed of the car 6 based on the absolute position information of the APS 20. Information including the calculated position and speed of the car 6 will be referred to hereinafter as "car position / speed information." The car position / speed information is sent to the evacuation operation processing unit 124.

[0028] 2-2. Process S20: Earthquake detection process In process S20 shown in FIG. 3, the earthquake detection processing unit 122 performs earthquake detection processing. In the earthquake detection processing, the earthquake detection processing unit 122 determines the earthquake occurrence state, including the occurrence and convergence of an earthquake, based on the earthquake detection signal from the earthquake sensor 40. "Convergence" here means that the earthquake determined to have occurred has subsided. Information including the determined earthquake occurrence state will be referred to hereinafter as "earthquake occurrence state information." The earthquake occurrence state information is sent to the trip detection processing unit 123 and the evacuation operation processing unit 124.

[0029] 2-3. Process S30: Hook detection process In process S30 shown in Fig. 3, the snagging detection processing unit 123 performs snagging detection processing. Fig. 4 is an activity diagram of the snagging detection processing performed by the snagging detection processing unit. In the activity diagram, arrows drawn with dashed lines indicate flows in which control is performed. In the activity diagram, arrows drawn with solid lines indicate flows in which data is exchanged. The flow shown in Fig. 4 is repeatedly executed at a predetermined control period.

[0030] In process S100, earthquake occurrence status information is input from the earthquake detection processing unit 122, and the process proceeds to process S102. In process S102, it is determined whether the input earthquake occurrence status information includes information that "an earthquake has occurred." As a result, if the earthquake occurrence status information includes information that "an earthquake has not occurred," the process proceeds to process S104. On the other hand, if the earthquake occurrence status information includes information that "an earthquake has occurred," the process proceeds to process S106.

[0031] In step S104, the amount of strain included in the strain information input from the strain detector 42 is recorded in memory as the initial amount of strain before the occurrence of the earthquake. After step S104 is performed, the processing of this routine is terminated.

[0032] In step S106, it is determined whether the input earthquake occurrence status information includes information about "earthquake has converged." If the earthquake occurrence status information includes information about "earthquake has converged," the process proceeds to step S108; if the earthquake occurrence status information does not include information about "earthquake has converged," the process of this routine is terminated.

[0033] In step S108, the current amount of strain is acquired, which is included in the strain information input from the strain detector 42. After step S108 is completed, the process proceeds to step S110.

[0034] In step S110, the amount of change in the current strain amount relative to the initial strain amount is calculated according to the following equation (1): After step S110 is completed, the process proceeds to step S112. Fluctuation amount = current strain amount - initial strain amount (1)

[0035] In process S112, it is determined whether the elevator is in evacuation operation. Evacuation operation is an operation in which the car 6 travels to a predetermined evacuation floor when an earthquake occurs. The conditions for executing evacuation operation will be described later. If the result of process S112 shows that evacuation operation is in progress, the process proceeds to process S118, and if evacuation operation is not in progress, the process proceeds to process S114.

[0036] In step S114, it is determined whether the amount of change in the strain calculated in step S110 exceeds a first reference value. The determination in step S114 is hereinafter referred to as the "primary determination." If an earthquake causes a jamming problem in the APS code tape 22, the amount of strain after the earthquake subsides will be greater than the initial amount of strain before the earthquake. The first reference value used here is a preset threshold value for the amount of change in strain used to determine whether a jamming problem has occurred in the APS code tape 22. If the amount of change is smaller than the first reference value, it is determined that a jamming problem has not occurred in the APS code tape 22, and this routine is terminated. On the other hand, if the amount of change exceeds the first reference value, it is determined that a jamming problem has occurred in the APS code tape 22, and the routine proceeds to step S116.

[0037] In step S116, information on the state of the APS code tape 22 being caught, including the fact that the APS code tape 22 has been detected as being caught by the primary determination, is sent to the evacuation operation processing unit 124, and the processing of this routine is then terminated.

[0038] In step S118, it is determined whether the variation in the strain calculated in step S110 of this routine exceeds a second judgment reference value. The judgment in step S118 is hereinafter referred to as the "secondary judgment." If an earthquake causes a catching abnormality in the APS code tape 22, the strain may increase as the car 6 moves toward the evacuation floor during evacuation operations. Figure 5 illustrates the relationship between the strain of the APS code tape and the car's position. As shown in this figure, if a catching abnormality occurs in the APS code tape 22, as the car 6 moves toward the catching point of the APS code tape 22, the strain gradually increases because the APS code tape 22 is restricted by the guide to the sensing range of the APS sensor 24. The second judgment reference value is a preset threshold value for the variation in strain used to determine whether a catching abnormality has occurred in the APS code tape 22. Note that this second judgment reference value may be the same as or different from the first judgment reference value.

[0039] If the result of the secondary determination in step S118 is that the amount of variation is smaller than the second reference value, it is determined that no catch abnormality has occurred in the APS code tape 22, and this routine is terminated. On the other hand, if the amount of variation exceeds the second reference value, it is determined that a catch abnormality has occurred in the APS code tape 22, and the process proceeds to step S120.

[0040] In process S120, jam detection status information including the secondary determination that a jamming abnormality in the APS code tape 22 has been detected is sent to the evacuation operation processing unit 124, and the processing of this routine is then terminated. In this way, according to the jam detection processing performed by the jam detection processing unit 123, jam detection status information including the primary determination that a jamming abnormality in the APS code tape 22 has been detected and jam detection status information including the secondary determination that a jamming abnormality in the APS code tape 22 has been detected are distinguished and sent to the evacuation operation processing unit 124. This makes it possible to take different actions depending on the jam detection status information in the evacuation operation processing described below.

[0041] 2-4. Process S40: Evacuation operation process In process S40 shown in Fig. 3, the evacuation operation processing unit 124 performs evacuation operation processing. Fig. 6 is an activity diagram of the evacuation operation processing performed by the evacuation operation processing unit. In the activity diagram, arrows drawn with dashed lines indicate flows in which control is performed. In the activity diagram, arrows drawn with solid lines indicate flows in which data is exchanged. The flow shown in Fig. 6 is repeatedly executed at a predetermined control cycle.

[0042] In process S130, earthquake occurrence status information is input from the earthquake detection processing unit 122, and the process proceeds to process S132. In process S132, it is determined whether an earthquake has occurred. Here, it is determined whether the input earthquake occurrence status information includes information that "an earthquake has occurred." As a result, if the earthquake occurrence status information includes information that "an earthquake has not occurred," the process of this routine is terminated. On the other hand, if the earthquake occurrence status information includes information that "an earthquake has occurred," the process proceeds to process S134.

[0043] In process S134, a safety command indicating "stop running" of the car 6 is generated and output to the drive unit 14. Upon receiving the safety command, the drive unit 14 performs braking control to stop the car 6 on the spot. This prevents the elevator from running while an earthquake is occurring. After process S134 is executed, the process proceeds to process S136.

[0044] In step S136, it is determined whether the input earthquake occurrence status information includes the information "earthquake has converged." If the earthquake occurrence status information includes the information "earthquake has converged," the process proceeds to step S138; if the earthquake occurrence status information does not include the information "earthquake has converged," the process of this routine is terminated.

[0045] In step S138, the catch detection status information is input from the evacuation operation processing unit 124, and the process proceeds to step S140. In step S140, it is determined whether the input catch detection status information includes the detection of a catch abnormality in the APS code tape 22 by the primary determination. If the determination is affirmative, the process proceeds to step S142.

[0046] In process S142, a safety command indicating that the car 6 is "unable to restart" is generated and output to the drive unit 14. The drive unit 14, which has received the safety command, performs braking control to stop the car 6 on the spot. This prevents the car 6 from traveling in a state where an abnormality has occurred due to the APS code tape 22 getting caught. When process S142 is executed, the processing of this routine is terminated.

[0047] On the other hand, if the determination in process S140 is negative, it is determined that there is a high probability that the APS code tape 22 is not caught, and the process proceeds to process S144. In process S144, an evacuation operation of the elevator is carried out. Here, a drive command for running the car 6 to the evacuation floor is generated and output to the drive unit 14. The drive unit 14, having received the running command, performs running control for running the car 6 to the evacuation floor. As a result, the elevator car 6 starts running toward the evacuation floor. Once process S144 is executed, the process proceeds to process S146.

[0048] In step S146, it is determined whether the inputted jam detection state information includes the detection of a jamming abnormality in the APS code tape 22 by the secondary determination. If the determination is negative, the processing of this routine is terminated. On the other hand, if the determination is positive, it is determined that the amount of strain is gradually increasing as the car 6 travels toward the jamming point on the APS code tape 22, and the processing proceeds to step S148.

[0049] In process S148, a reverse operation is performed in which the car 6 reverses its traveling direction and travels. Here, a drive command to travel the car 6 in the reverse direction is generated and output to the drive unit 14. The drive unit 14, which has received the travel command, performs travel control to travel the car 6 in the reverse direction. As a result, the elevator car 6 starts traveling in the opposite direction to the evacuation floor. Once process S148 is executed, the process proceeds to process S150.

[0050] In step S150, it is determined whether the inputted jam detection status information includes the detection of a jamming abnormality in the APS code tape 22 by the secondary determination. If the determination is negative, the processing of this routine is terminated. On the other hand, if the determination is positive, it is determined that the amount of strain is gradually increasing as the car 6 travels toward another jamming point on the APS code tape 22, and the processing proceeds to step S152.

[0051] In process S152, a safety command indicating that the car 6 is "unable to restart" is generated and output to the drive unit 14. The drive unit 14, which has received the safety command, performs braking control to stop the car 6 on the spot. This prevents the car 6 from traveling in a state where multiple catch abnormalities have occurred in the APS code tape 22. When process S152 is executed, the processing of this routine is terminated.

[0052] 3. Action and Effects According to the operation of the elevator system 100 as described above, the following actions and effects can be obtained.

[0053] If an earthquake causes a catching abnormality in the APS cord tape 22 due to vibration of the hoistway 2, the path length of the APS cord tape 22 increases, thereby increasing the amount of strain. According to the elevator system 100 of this embodiment, when the occurrence of an earthquake is determined based on the earthquake detection signal from the earthquake sensor 40, the presence or absence of a catching abnormality in the APS cord tape 22 is determined based on the amount of change in the amount of strain of the APS cord tape 22 from the initial amount of strain. With this configuration, a catching abnormality in the APS cord tape 22 can be detected early, making it possible to take early action to prevent damage to related equipment.

[0054] Furthermore, according to the elevator system 100 of this embodiment, if it is determined in the primary determination after the earthquake has subsided that there is a catching abnormality in the APS cord tape 22, the car 6 that has been stopped in place continues to be stopped. This makes it possible to prevent the APS cord tape 22 that has the catching abnormality from being stretched or damaged.

[0055] If the catch point of the APS cord tape 22 is located away from the position of the car 6, it is possible that no significant change will be observed in the amount of strain, and that the primary judgment will not be able to detect a catch abnormality in the APS cord tape 22. According to the elevator system 100 of this embodiment, the secondary judgment is performed during evacuation operations after the earthquake has subsided, making it possible to detect a catch abnormality when there is an undetected catch point in the running direction of the car 6.

[0056] Furthermore, according to elevator system 100 of this embodiment, if a jamming abnormality is detected in the secondary judgment, a reversal operation is performed to reverse the running direction of car 6. This causes car 6 to move in a direction away from the jamming point, thereby reducing the load caused by distortion of APS cord tape 22 and preventing damage.

[0057] If a catching abnormality is detected in the secondary determination during reverse operation, it is possible that a catching point on the APS code tape 22 also exists in the running direction of the reverse operation. According to the elevator system 100 of this embodiment, if a catching abnormality is detected in the secondary determination during reverse operation, the running of the car 6 is stopped. This makes it possible to prevent damage to the APS code tape 22 and its related equipment.

[0058] 4. Variations The elevator system of the embodiment may employ the following modified aspects. These modified aspects may also be applied to elevator systems of other embodiments described later.

[0059] 4-1.Control device 10 7 is a diagram showing a modified example of the hardware resources of the control device. The control device 10 includes, as its hardware resources, a processing circuit 103 including a processor 101 and a memory 102. The processing circuit 103 may include multiple processors 101. The processing circuit 103 may also include multiple memories 102.

[0060] In this embodiment, the functions of the control device 10 can be realized by software written as a program, firmware, or a combination of software and firmware. The program is stored in memory 102. Alternatively, the program may be recorded in a program product such as a computer-readable recording medium. The control device 10 realizes each function by executing the program stored in memory 102 by a processor 101 (computer).

[0061] The processor 101 is also called a CPU (Central Processing Unit), central processing unit, processing unit, arithmetic unit, microprocessor, microcomputer, or DSP. The memory 102 may be a semiconductor memory, a magnetic disk, a flexible disk, an optical disk, a compact disk, a minidisk, or a DVD. Usable semiconductor memory includes RAM, ROM, flash memory, EPROM, EEPROM, etc.

[0062] Fig. 8 is a diagram showing another modified example of the hardware resources of the control device. In the example shown in Fig. 8, the control device 10 includes a processor 101, a memory 102, and a processing circuit 103 including dedicated hardware 104. Fig. 8 shows an example in which some of the functions of the control device 10 are realized by the dedicated hardware 104. All of the functions of the control device 10 may also be realized by the dedicated hardware 104. The dedicated hardware 104 may be a single circuit, a composite circuit, a programmed processor, a parallel programmed processor, an ASIC, an FPGA, or a combination thereof. [Explanation of symbols]

[0063] 2 elevator shaft, 2a pit, 3 hoisting machine, 4 main rope, 8 power supply, 10 control device, 12 operation control unit, 14 drive unit, 20 absolute positioning system (APS), 22 APS code tape, 24 APS sensor, 32 sheave, 34 motor, 40 earthquake detector, 42 strain detector, 100 elevator system, 101 processor, 102 memory, 103 processing circuit, 104 dedicated hardware, 121 position and speed detection processing section, 122 earthquake detection processing section, 123 snagging detection processing section, 124 evacuation operation processing section

Claims

1. a detection object whose upper and lower ends are fixed along the moving direction of a car in an elevator shaft, and whose absolute position information is continuously set corresponding to the position in the moving direction; a detection device installed in the car and configured to read the absolute position information from the object to be detected; a strain detector that detects the amount of strain in the extension direction of the detection object; an earthquake sensor that detects vibration of the elevator shaft and outputs an earthquake detection signal; a control device that, when determining that an earthquake has occurred based on the earthquake detection signal, determines whether or not the detection object has become caught abnormally based on the amount of strain; and An elevator system comprising:

2. The control device an earthquake detection processing unit that executes an earthquake detection process to determine whether an earthquake has occurred based on the earthquake detection signal; a catch detection processing unit that, when it is determined in the earthquake detection processing that convergence has occurred after the occurrence of an earthquake, calculates a variation amount of the current strain amount relative to the strain amount before the occurrence of the earthquake, and performs a primary determination that determines that there is a catch abnormality in the detected object when the variation amount exceeds a first determination reference value; 10. The elevator system of claim 1, comprising:

3. The control device 3. The elevator system according to claim 2, further comprising an evacuation operation processing unit that, when it is determined in the earthquake detection processing that an earthquake has occurred, stops the car in place until it is determined that the earthquake has subsided, and that continues to stop the car when it is determined in the primary determination that there is an abnormality in the detected object being caught.

4. The evacuation operation processing unit performs evacuation operation to run the car toward an evacuation floor when it is determined in the primary determination that there is no abnormality in the detection object.

4. The elevator system according to claim 3, wherein the elevator system is configured as follows:

5. The catch detection processing unit A secondary determination is performed to determine that an abnormality has occurred in the detection object when the amount of change calculated during the evacuation operation exceeds a second determination reference value.

5. The elevator system according to claim 4, wherein the elevator system is configured as follows:

6. The evacuation operation processing unit performs a reversal operation in which the traveling direction of the car is reversed and the car is operated when it is determined in the secondary determination that there is an abnormality in the detection object.

6. The elevator system according to claim 5, wherein the elevator system is configured as follows:

7. The evacuation operation processing unit stops the car on the spot when it is determined in the secondary determination during the execution of the reverse operation that there is an abnormality in the detection object.

7. The elevator system according to claim 6, wherein the elevator system is configured as follows:

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