JP2019167215A - Elevator - Google Patents

Abstract

To provide an elevator capable of improving the convenience of users.SOLUTION: The elevator includes a plurality of brake units each having a brake for stopping a car and a detection device for detecting a state of the brake, a monitoring device for monitoring the failure of the brake based on information from the detection device, and a control device for controlling the operation of a car. The control device executes degenerative operation of the car based on the number of brake units, which are determined to be not in failure by the monitoring device, when the monitoring device determines that the failure occurs in any of the plurality of brake units.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an elevator, and is suitable for application to an elevator that monitors a brake failure, for example.

  A hoisting machine for operating an elevator car is provided with a brake for stopping the car. The brake can stop the car in an emergency such as a power failure, but if the brake breaks down, it becomes impossible to stop the elevator car, so the brake can detect the state of the brake A detection device is provided.

  Here, regarding an elevator having two brakes in the hoisting machine, when the brake abnormality detecting means detects an abnormality, a torque is applied to the hoisting machine in a state where the brake is controlled to the braking side, and a braking force exceeding a certain level. If it can be confirmed that there is a failure, a method of discriminating between a failure of the brake body and a failure of the brake abnormality detection means by proposing a failure of the brake abnormality detection means has been proposed (see Patent Document 1).

JP2012-180205A

  However, in the technique described in Patent Document 1, the elevator is stopped even if the brake abnormality detecting means is faulty. Even if the brake main body is faulty or the brake abnormality detecting means is faulty, the user It will impair the convenience.

  The present invention has been made in view of the above points, and intends to propose an elevator that can enhance the convenience for the user.

  In order to solve this problem, in the present invention, there are a plurality of brake units each having a brake for stopping a car and a detection device for detecting the state of the brake, and the failure of the brake based on information from the detection device. And a control device that controls the operation of the car, wherein the control device determines that any of the plurality of brake units has a failure by the monitoring device. Then, the car is degenerated based on the number of brake units that have been determined not to fail by the monitoring device.

  According to the above configuration, for example, when it is determined that there is a failure in the brake unit based on information from the detection device, the brake unit is detected when it is confirmed that the brake of the brake unit is normal. Since this is a malfunction of the device, it is possible to perform a degenerate operation in which the car is operated while ensuring safety.

  According to the present invention, a highly available elevator can be realized.

It is a figure showing an example of composition concerning an elevator by a 1st embodiment. It is a figure showing an example of composition concerning a brake unit by a 1st embodiment. It is a figure which shows an example of the process sequence which concerns on the driving | operation monitoring process by 1st Embodiment.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

(1) 1st Embodiment In FIG. 1, 1 shows the elevator by 1st Embodiment as a whole. The elevator 1 includes a hoisting machine 101, a main rope 102, a car 103, a counter weight 104, a plurality of brake units 107 having a brake 105 and a detection device 106, a rotation detection device 108, a control device 109, and a monitoring device 110. Consists of including. In the elevator 1, the hoisting machine 101 is rotated to wind up the main rope 102, and the car 103 and the counterweight 104 are raised and lowered in a fishing bottle manner.

  The brake 105 is a device for braking the hoisting machine 101 (device for stopping the car 103). The car 103 can be stopped by bringing the brake 105 into a braking state, and the car 103 can be raised and lowered by putting the brake 105 into an open state. In the present embodiment, an example in which the brake 105 is provided with three brakes 105A, 105B, and 105C in the hoisting machine 101 will be described. Note that the number of brakes 105 provided in one hoisting machine 101 may be two, or four or more.

  The detection device 106 detects (for example, outputs as a detection signal) the state of the brake 105 (braking state and released state). As the detection device 106, detection devices 106A, 106B, and 106C are provided corresponding to each of the plurality of brakes 105. In the present embodiment, the detection device 106 will be described by taking a mechanical contact switch as an example.

  The brake unit 107 includes a brake 105 and a detection device 106 as a set. As the brake unit 107, a brake unit 107A having a brake 105A and a detection device 106A, a brake unit 107B having a brake 105B and a detection device 106B, and a brake unit 107C having a brake 105C and a detection device 106C are provided.

  The rotation detection device 108 is a rotary encoder, for example, and detects the rotation of the hoisting machine 101. More specifically, the rotation detection device 108 detects the rotation state and the rotation speed of the hoisting machine 101 (a brake disc 201 described later).

  The control device 109 is electrically connected to the hoisting machine 101, the brake 105, the detection device 106, and the rotation detection device 108. For example, the control device 109 performs operation control of the hoisting machine 101 based on the rotation of the hoisting machine 101 received from the rotation detecting device 108, receives feedback of rotational torque from the hoisting machine 101, and Operation control (braking control and release control) is performed, and information from the detection device 106 (for example, data obtained by digitally converting a detection signal) is received. Digital conversion is performed by an arbitrary device. For example, the digital conversion may be performed by the detection device 106, may be performed by the control device 109, or may be performed by another device.

  The monitoring device 110 is, for example, a computer (computer), and monitors a failure of the brake 105 based on information from the detection device 106. The monitoring device 110 receives operation information (e.g., information from the detection device 106) of the elevator 1 from the control device 109 via the communication line 111, and makes a determination as to whether or not the brake 105 has failed based on the received information. The monitoring device 110 is connected to the control center 113 through a public Internet line 112 so as to be communicable.

  For example, the monitoring device 110 is a notebook personal computer, a server device, or the like, and a CPU (Central Processing Unit), a RAM (Random Access Memory), a ROM (Read Only Memory), a HDD (Hard Disk Drive), a communication device, not shown. And so on.

  The function of the monitoring device 110 may be realized by, for example, the CPU reading a program stored in the ROM into the RAM and executing it (software), or may be realized by hardware such as a dedicated circuit. A combination of software and hardware may be realized. Also, some of the functions of the monitoring device 110 may be realized by another computer that can communicate with the monitoring device 110. The communication device is composed of, for example, a NIC (Network Interface Card), and performs protocol control during communication with the control center 113. The function (processing) of the monitoring device 110 will be described later with reference to FIG.

  When the monitoring device 110 detects a failure of the brake 105 or the like, the control center 113 receives a signal indicating that the failure has been detected from the monitoring device 110 via the public Internet line 112, and notifies the maintenance staff in charge of the elevator 1 Has the ability to contact. Note that the control center 113 includes one or more computers (computers).

  FIG. 2 is a diagram illustrating an example of a configuration related to the brake unit 107A.

  The brake 105 </ b> A includes two or more movable portions 202 and 203 on the circumference of the brake disc 201 of the rotating body, and has a structure in which the brake disc 201 is sandwiched and stopped by brake pads (linings) 204 and 205. The movable parts 202 and 203 are movable by the repulsive force of the brake spring 206 and the attractive force of the armature 207 such as a highly rigid plate and the magnet coil (core) 208. The movable part 202 has an integral structure with the magnet coil 208 and the frame 209. The frame 209 is slidably supported by a pedestal 210 such as a fixed base. In addition, the movable part 203 has an integral structure with the amateur 207.

  According to such a configuration, when a voltage is applied (energized) to the magnet coil 208, the armature 207 and the brake pad 205 pressed by the brake spring 206 are attracted and a gap is formed between the brake pad 205 and the brake disc 201. When the armature 207 cannot be moved by the restricting member 211, the frame 209 is attracted to the armature 207, a gap is generated between the brake pad 204 and the brake disc 201, and the hoisting machine 101 can rotate ( The brake 105A is released).

  When the voltage of the magnet coil 208 is turned off (not energized), the armature 207 is not attracted, and the brake pad 206 is pressed against the brake disc 201 by the brake spring 206, and the brake pad 204 is pressed against the brake disc 201, thereby increasing the braking force. Occurs and the hoisting machine 101 stops rotating (braking state of the brake 105A).

  In addition, between the amateur 207 and the frame 209, a detection device 106A is installed (in this example, fixed to the frame 209). In addition, the place and aspect which install 106 A of detection apparatuses are not limited, It can install in arbitrary places and aspects.

  The detection unit 301 (switch) of the detection device 106A outputs a detection signal “ON” when the distance between the amateur 207 and the frame 209 reaches a predetermined distance, and when the distance between the amateur 207 and the frame 209 does not reach the predetermined distance, the detection signal “ "OFF" is output. For example, when the detection signal of the detection device 106A is “ON”, it indicates that the brake 105A is in an open state, and when the detection signal of the detection device 106A is “OFF”, it indicates that the brake 105A is in a braking state. Show.

  Here, the failure of the brake 105 includes a failure in which the brake 105 does not enter a braking state (referred to as a brake open failure) and a failure in which the brake 105 does not enter an open state (referred to as a brake close failure). The detection signal “ON” at the detection device 106 continues abnormally (for example, the detection signal “ON” continues beyond a predetermined time even though the car 103 is stopped or decelerated). If there is a brake open failure. In addition, when the detection signal “OFF” in the detection device 106 is abnormally continued (for example, the detection signal “OFF” continues over a predetermined time even though the car 103 is accelerating). There is a possibility of a brake close failure.

  If it adds, although illustration is abbreviate | omitted, the axis | shaft of the brake disc 201 and the electric motor for rotating the brake disc 201 may be connected via the gear, and it is connected not via the gear. May be.

  Since the brake unit 107B has the same configuration and the brake unit 107C has the same configuration, the description thereof is omitted.

  FIG. 3 is a diagram illustrating an example of a processing procedure related to the operation monitoring process. The driving monitoring process is performed at a predetermined timing (for example, timing when information from the detection device 106 is received).

  First, the monitoring device 110 determines whether or not a failure of the brake unit 107 has been newly detected based on the information from the detection device 106 received from the control device 109 (step S10). If the monitoring device 110 determines that a failure in the brake unit 107 has been newly detected, the monitoring device 110 proceeds to step S20. If the monitoring device 110 determines that a failure in the brake unit 107 has not been newly detected, the monitoring device 110 proceeds to step S100. .

  In step S20, the monitoring device 110 determines whether or not the detection signal “ON” in the detection device 106 continues abnormally. When the monitoring device 110 determines that the detection signal “ON” continues abnormally, the monitoring apparatus 110 proceeds to step S30, and when it determines that the detection signal “ON” does not continue abnormally, the monitoring device 110 performs processing to step S120. Move.

  In step S30, the monitoring device 110 determines whether or not there are remaining brake units 107 that have not detected a failure (in this example, whether or not the number of brake units 107 that have detected a failure is two or less). To do. If the monitoring apparatus 110 determines that there is a brake unit 107 that has not detected a failure, the monitoring apparatus 110 proceeds to step S40, and if it determines that there is no brake unit 107 that has not detected a failure, step S220. Move processing to.

  In step S40, the monitoring device 110 instructs the control device 109 to perform a braking force diagnosis. In response to the instruction, the control device 109 performs a braking force diagnosis in which a rotational torque is applied stepwise to the hoisting machine 101 in a state where a command to make the brake 105 a braking side is issued.

  Subsequently, the monitoring device 110 determines whether or not a normal braking state is maintained (whether or not the detection device 106 has a failure) (step S50). For example, in the braking force diagnosis, the monitoring device 110, based on the feedback of the rotational torque received from the hoisting machine 101, when the hoisting machine 101 is applied with a rotational torque equal to or greater than a determination value determined for each specification of the elevator 1. When the control device 109 determines and the rotation detection device 108 does not detect the rotation of the hoisting machine 101, it is determined that the normal braking state is maintained by the brake 105. When the monitoring device 110 determines that the normal braking state is maintained (the detection device 106 has a failure), the monitoring device 110 proceeds to step S60, and the normal braking state is not maintained (the detection device 106 has no failure). ), It is estimated that the brake is open, and the process proceeds to step S210.

  More specifically, the reason why the braking state cannot be maintained is because the components constituting the brake 105 (the brake disc 201, the movable parts 202 and 203, the brake pads 204 and 205, the braking spring 206, the armature 207, the magnet coil 208, Frame 209, pedestal 210, etc.), and a configuration related to the brake 105 (electric motor, gear provided between the brake disc 201 and the electric motor, etc.). In this regard, in step S50, when the monitoring device 110 can determine at least whether or not the detection device 106 is in failure, the monitoring device 110 does not need to distinguish between the components constituting the brake 105 and the configuration related to the brake 105. For convenience, the failure of the brake 105 is indicated without identifying these.

  In step S60, the monitoring apparatus 110 detects that the detection signal “ON” is abnormally detected, and the detection signal “ON” continues to fail due to a cause such as a contact of the detection apparatus 106 being welded (ON failure). ), And it is determined that the brake unit 107 including the detection device 106 has failed.

  In step S <b> 70, the monitoring device 110 notifies the control center 113 that the detection device 106 is out of order via the public Internet line 112. With this notification, the control center 113 issues a work instruction to maintenance personnel.

  The monitoring device 110 determines whether or not the number of brake units 107 that have not detected a failure is equal to or less than a predetermined number (for example, one) (step S80). If the monitoring device 110 determines that the number of brake units 107 that have not detected a failure is less than or equal to the predetermined number, the monitoring apparatus 110 moves to step S220, and the number of brake units 107 that have not detected a failure exceeds the predetermined number. If it is determined, the process proceeds to step S90.

  In step S90, the monitoring device 110 performs a degenerate operation. In the degenerate operation of the present embodiment, the monitoring device 110 instructs the control device 109 to perform the degenerate operation within a range in which safety can be ensured. For example, the monitoring device 110 instructs the control device 109 to perform the degenerate operation according to the number of brake units 107 that have not detected a failure. According to such a configuration, degenerate electric power is performed according to the number of brake units 107 that have not detected a failure, so that convenience for the user can be improved according to the status of the elevator 1.

  More specifically, the monitoring device 110 has two brakes 105 (healthy brakes 105) of the brake unit 107 that have not detected a failure, and the brakes 105 (unhealthy) of the brake unit 107 that has detected the failure. When the number of brakes 105) is one, the degeneration operation in which the maximum load capacity of the car 103 is limited to a predetermined value (for example, 2/3 of the original) defined according to the number of healthy brakes 105 is performed. The controller 109 is instructed to carry out.

  Here, the elevator 1 has three brakes 105 and is designed so that the car 103 can be safely stopped even when the car 103 has a load capacity approximately twice the maximum load capacity of the car 103. Therefore, even if there are two healthy brakes 105, the safety of the user can be ensured without performing the degenerate operation. However, in the elevator 1, a degenerate operation with restriction on the maximum load capacity of the car 103 is performed for the purpose of ensuring the same safety as when the brakes 105 are all healthy.

  Note that the degenerate operation is not limited to an operation in which the maximum load capacity of the car 103 is limited to a predetermined value defined according to the number of brake units 107 that have not detected a failure. For example, it may be an operation that limits the maximum load capacity of the car 103 to a predetermined value (for example, uniformly 1/3). Further, for example, the upper limit speed of the car 103 (the upper limit speed of ascent, the upper limit speed of lowering, or both) may be set to a predetermined value. It may be a degenerate operation to be restricted. Further, for example, the upper limit speed of the car 103 may be a degenerate operation in which the upper limit speed is limited to a predetermined value defined according to the number of brake units 107 that have not detected a failure. Further, for example, the maximum load capacity of the car 103 may be limited to a predetermined value, and the degeneration operation may be performed in which the upper limit speed of the car 103 is limited to a predetermined value. Moreover, it is good also as other degeneration driving | operations, such as restricting the raising / lowering stroke of the car 103.

  In step S100, the monitoring device 110 determines whether the detection device 106 has been replaced or adjusted. In other words, the monitoring device 110 continues the degenerate operation until the detection device 106 determined to have failed is replaced or adjusted, and all the detection devices 106 provided corresponding to the brakes 105 have no failure. When the monitoring device 110 determines that the detection device 106 has been replaced or adjusted, the monitoring device 110 proceeds to step S110, and when it is determined that the detection device 106 has not been replaced or adjusted, the operation monitoring processing ends. .

  In step S110, the monitoring device 110 instructs the control device 109 to return to normal operation (restart normal operation).

  In step S120, the monitoring device 110 determines whether or not the detection signal “OFF” in the detection device 106 continues abnormally. If the monitoring apparatus 110 determines that the detection signal “OFF” continues abnormally, the monitoring apparatus 110 proceeds to step S130. If the monitoring apparatus 110 determines that the detection signal “OFF” does not continue abnormally, the monitoring apparatus 110 proceeds to step S100. Move.

  In step S130, the monitoring device 110 determines whether or not there is a brake unit 107 that has not detected a failure. If the monitoring device 110 determines that there is a brake unit 107 that has not detected a failure, the monitoring apparatus 110 proceeds to step S140, and if it is determined that there is no brake unit 107 that has not detected a failure, step S220. Move processing to.

  In step S140, the monitoring device 110 instructs the control device 109 to perform torque diagnosis. In response to the instruction, the control device 109 issues a command to release the brake 105 and performs a torque diagnosis for checking the rotational torque when the hoisting machine 101 rotates.

  Subsequently, the monitoring device 110 determines whether or not a normal open state is maintained (whether or not the detection device 106 has a failure) (step S150). For example, the monitoring device 110 determines that the normal release state is maintained by the brake 105 when the feedback of the rotational torque from the hoisting machine 101 is a rotational torque less than a determination value determined for each specification of the elevator 1. To do. If the monitoring device 110 determines that the normal release state is maintained, the process proceeds to step S160. If the monitoring device 110 determines that the normal release state is not maintained, the monitoring device 110 estimates that the brake is closed, and the process proceeds to step S210. Move.

  In step S160, the monitoring device 110 detects a failure (OFF failure) in which the detection signal “OFF” continues with respect to the detection device 106 that has detected the detection signal “OFF” abnormally, for example, because the circuit of the detection device 106 is disconnected. It is determined that the brake unit 107 including the detection device 106 has failed.

  Subsequently, the processing of step S170 to step S190 is performed, but since it is the same as the processing of step S70 to step S90, the description thereof is omitted.

  In step S210, the monitoring device 110 determines that the brake 105 has failed, and determines that the brake unit 107 including the brake 105 has failed.

  In step S220, the monitoring device 110 notifies the control center 113 that the brake 105 is out of order via the public Internet line 112. With this notification, the control center 113 issues a work instruction to maintenance personnel.

  In step S230, the monitoring device 110 instructs the control device 109 to stop the car 103 for safety.

  Subsequently, the monitoring device 110 determines whether replacement or adjustment of the failed brake 105 or the like has been performed (step S240). In other words, the monitoring device 110 performs the operation (stops the stop state) of the car 103 until replacement or adjustment of the brake 105 or the like determined to be faulty is performed and the detection device 106 confirms that it is normal. continue. When the monitoring device 110 determines that replacement or adjustment of the failed brake 105 or the like has been performed, the monitoring apparatus 110 proceeds to step S110, and when it is determined that replacement or adjustment of the failed brake 105 or the like has not been performed, step S230 Move processing to.

  As described above, when there is no remaining brake unit 107 that has not detected a failure (when there is a possibility of failure of all brakes 105), diagnosis is not performed (braking force diagnosis and torque diagnosis are performed). By stopping the operation of the car 103, the car 103 cannot be controlled in the diagnosis, and the car 103 can be prevented from being damaged.

  Further, as described above, when the number of brake units 107 that have not detected a failure is equal to or less than a predetermined number, by stopping the operation of the car 103, the load concentrates on the healthy brake 105 and is immediately consumed. It will be possible to avoid situations such as failure.

  As described above, when the monitoring device 110 determines that there is a failure in the brake unit 107 based on the information from the detection device 106, the monitoring device 110 diagnoses the brake 105 and confirms that the brake 105 is normal. It is determined that the detection device 106 has a failure. More specifically, after determining that there is a possibility of a brake open failure or a brake close failure of the brake 105 using the detection device 106, the monitoring device 110 diagnoses the braking force of the brake 105 in the case of a brake open failure, In the case of a brake close failure, a torque diagnosis of the hoisting machine 101 is performed to determine a failure of the detection device 106 and a failure of the brake 105. Note that the technique described in Patent Document 1 is effective only in the case of a brake open failure, and in the case of a brake close failure, the failure of the brake 105 and the failure of the detection device 106 cannot be determined. In this regard, according to the elevator 1 of the present embodiment, it is possible to discriminate between the failure of the detection device 106 and the failure of the brake 105 in the case of a brake close failure.

  Further, in the case of a failure of the detection device 106, it is possible to improve user convenience by ensuring the safety of the user and performing the degenerate operation without stopping the operation of the car 103. It becomes possible.

  Further, in the case of a failure of the detection device 106, after ensuring the safety of the user, a degenerate operation is performed in which the maximum load capacity or the upper limit speed of the car 103 is limited without stopping the operation of the car 103. By doing so, it becomes possible to improve the convenience of the user in accordance with the usage status of the elevator 1.

  As described above, when the monitoring device 110 determines that any of the plurality of brake units 107 has a failure, the control device 109 is based on the number of brake units 107 that are determined to have no failure by the monitoring device 110. Thus, since the car 103 is degenerated, it is possible to perform the degenerate operation of operating the car 103 while ensuring safety.

  According to the present embodiment, the availability of the elevator can be increased.

(2) Other Embodiments In the above-described embodiment, the case where the present invention is applied to the elevator 1 has been described. However, the present invention is not limited to this and is widely applied to various other elevators. can do.

  In the above-described embodiment, when there is a possibility of failure in all the brakes 105 (when there is no brake unit 107 that has not detected a failure), work for maintenance personnel to ensure safety Although the instruction is issued, the present invention is not limited to this, and the configuration may be such that the degenerate operation is not performed as long as it is confirmed that the braking force diagnosis or the torque diagnosis is in a normal state. Even in this case, since the failure of the detection device 106 and the failure of the brake 105 can be discriminated, the period during which the operation of the car 103 stops by quickly grasping the location of the failure and performing replacement, adjustment, etc. Thus, the availability of the elevator 1 can be increased.

  In the above-described embodiment, the case where a mechanical contact switch is used as the detection device 106 has been described. However, the present invention is not limited to this, and the detection device 106 may have any configuration capable of detecting a failure of the brake 105. Can be adopted. For example, as the detection device 106, a camera capable of photographing the brake pad 204 and the brake disc 201 may be provided, or a distance measurement sensor capable of detecting the distance between the brake pad 204 and the brake disc 201 may be provided. Other sensors may be provided.

  In the above-described embodiment, the case where the operation of the elevator 1 is stopped when there is one healthy brake 105 is described. However, the present invention is not limited to this, and there is one healthy brake 105. In this case, for example, the monitoring device 110 may instruct the control device 109 to perform a degeneration operation in which the maximum load capacity of the car 103 is limited to the original 1/3.

  In the above description, information such as programs, tables, and files for realizing each function is stored in a storage device such as a memory, a hard disk, or an SSD (Solid State Drive), or a recording medium such as an IC card, an SD card, or a DVD. Can be put in.

  In addition, the above-described configuration may be changed, rearranged, combined, or omitted as appropriate without departing from the gist of the present invention.

  DESCRIPTION OF SYMBOLS 1 ... Elevator, 101 ... Hoisting machine, 102 ... Main rope, 103 ... Ride car, 104 ... Counterweight, 105 ... Brake, 106 ... Detection device, 107 ... Brake unit, 108 ... Rotation detecting device 109... Control device 110.

Claims (6)

A plurality of brake units having a brake for stopping the car and a detection device for detecting the state of the brake; a monitoring device for monitoring a failure of the brake based on information from the detection device; and An elevator comprising a control device for controlling operation,
When the monitoring device determines that there is a failure in any of the plurality of brake units, the control device is configured to use the car based on the number of brake units that are determined to have no failure by the monitoring device. To perform degenerate operation,
An elevator characterized by that. A rotation detecting device for detecting the rotation of the hoisting machine for raising and lowering the car;
When the information indicating that the brake is in the released state is continuously detected by the monitoring device, the control device outputs a command to put the brake into a braking state to operate the hoisting machine. ,
The monitoring device responds to the brake when receiving information indicating that the torque is equal to or greater than a predetermined torque value from the hoist and information indicating that the hoist does not rotate from the rotation detection device. Determining that the detection device is malfunctioning and determining that the brake unit including the detection device is malfunctioning;
The elevator according to claim 1 characterized by things. A rotation detecting device for detecting the rotation of the hoisting machine for raising and lowering the car;
When the information indicating that the brake is in the released state is continuously detected by the monitoring device, the control device outputs a command to put the brake into a braking state to operate the hoisting machine. ,
When the monitoring device has not received at least one of information indicating that the hoisting machine is not less than a predetermined torque value from the hoisting machine and information indicating that the hoisting machine is not rotating from the rotation detection device, Determining that the brake is malfunctioning, and determining that the brake unit including the brake is malfunctioning;
The elevator according to claim 1 characterized by things. A rotation detecting device for detecting the rotation of the hoisting machine for raising and lowering the car;
When the information indicating that the brake is in a braking state is continuously detected by the monitoring device, the control device outputs a command to release the brake to the brake to operate the hoisting machine. ,
When the monitoring device receives from the hoisting machine information indicating that the hoisting machine is less than a predetermined torque value when the hoisting machine rotates, it determines that the detection device corresponding to the brake is faulty, and the detection It is determined that the brake unit including the device is defective,
The elevator according to claim 1 characterized by things. The control device performs at least one of a degenerate operation that limits a maximum load capacity of the car and a degenerate operation that limits an upper limit speed of the car.
The elevator according to any one of claims 1 to 4, wherein the elevator is provided. The control device, when it is determined by the monitoring device that the number of brake units that are determined not to have failed is less than a predetermined number, to stop the operation of the car,
The elevator according to claim 5.

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