EP2502869A1

EP2502869A1 - Elevator device

Info

Publication number: EP2502869A1
Application number: EP09851441A
Authority: EP
Inventors: Masunori Shibata
Original assignee: Mitsubishi Electric Corp
Current assignee: Mitsubishi Electric Corp
Priority date: 2009-11-18
Filing date: 2009-11-18
Publication date: 2012-09-26
Anticipated expiration: 2029-11-18
Also published as: KR101354728B1; WO2011061819A1; KR20120054043A; EP2502869A4; JPWO2011061819A1; EP2502869B1; CN102596778A; JP5360225B2; CN102596778B

Abstract

Provided is an elevator apparatus which permits the sharing of the platform of a control panel by simplifying a configuration for adding the function of controlling a brake device during the detection of an abnormality. For this purpose, the elevator apparatus includes a first control section which is provided on a control panel of an elevator and controls a brake device which brakes a traction machine which causes a car arranged in a shaft of the elevator to run, a detection section which is detachably provided on the control panel and detects an abnormality of the elevator, and a second control section which is detachably provided on the control panel and controls the brake device in place of the first control section during the detection of the abnormality by the detection section.

Description

Technical Field

The present invention relates to an elevator apparatus having a control panel which controls a brake device.

Background Art

In conventional elevator apparatus, the braking force of a brake device is controlled so that the deceleration speed of a car obtains a prescribed value on the basis of a deceleration command value and a speed signal during the detection of an abnormality (refer to Patent Literature 1, for example). In the elevator apparatus described in Patent Literature 1, both the basic action during the detection of an abnormality and the control of the braking force are performed by one braking force control unit. For this reason, if the deceleration speed of a car becomes excessive due to a failure of the braking force control unit and the like, a burden on a customer becomes large. And if the deceleration speed of a car becomes too small, the braking distance becomes long and the car comes into contact with the bottom part and top part of a shaft.
Therefore, there has been proposed an elevator apparatus which is such that an elevator is brought into a standstill by activating a rope gripper during the detection of an abnormality (refer to Patent Literature 2, for example). However, in a machine-room-less elevator which has become mainstream in recent years, it is difficult to obtain the installation space of a rope gripper.
In contrast to these elevator apparatus, there has been proposed an elevator apparatus which is provided with first brake means which actuates a brake device during the detection of an abnormality, and brings a car into an emergency stop and second brake control means which reduces the braking force of the brake device when the deceleration speed of a car has become not less than a prescribed value during the emergency braking action (refer to Patent Literature 3, for example). The above-described problems are solved by this configuration.

Citation List

Patent Literature

Patent Literature 1: Japanese Patent Laid-Open No. 07-157211
Patent Literature 2: Japanese Patent Laid-Open No. 2007-55691
Patent Literature 3: International Publication No. 2008/012896

Summary of Invention

Technical Problem

However, in the elevator apparatus described in Patent Literature 3, the configuration must be such that the second brake control device is actuated only when the deceleration speed of the car has become not less than a prescribed value at the time of emergency braking action by the first brake control means. For this reason, the configuration becomes complex, posing the problem that it is difficult to achieve the sharing of the platform of a control panel.
The present invention was made to solve the problem described above, and the object of the invention is to provide an elevator apparatus which permits the sharing of the platform of a control panel by simplifying a configuration for adding the function of controlling a brake device during the detection of an abnormality.

Means for Solving Problems

The elevator apparatus of the present invention includes a first control section which is provided on a control panel of an elevator and controls a brake device which brakes a traction machine which causes a car arranged in a shaft of the elevator to run, a detection section which is detachably provided on the control panel and detects an abnormality of the elevator, and a second control section which is detachably provided on the control panel and controls the brake device in place of the first control section during the detection of the abnormality by the detection section.

Advantageous Effect of Invention

According to the present invention, the sharing of the platform of a control panel can be achieved by simplifying a configuration for adding the function of controlling a brake device during the detection of an abnormality.

Brief Description of Drawings

Figure 1 is a basic block diagram of an elevator apparatus in Embodiment 1 of the present invention.
Figure 2 is a general block diagram to explain the case where the function of protection during a run with door open is added to the elevator apparatus of Figure 1.
Figure 3 is a circuit configuration diagram of the inside of a control panel before the addition of the function of protection during a run with the door open to the elevator apparatus in Embodiment 1 of the present invention.
Figure 4 is a circuit configuration diagram of the inside of a control panel after the addition of the function of protection during a run with the door open to the elevator apparatus in Embodiment 1 of the present invention.
Figure 5 is a flowchart to explain the action of protection of the elevator apparatus during a run with the door open.
Figure 6 is a timing chart to explain the normal-time control condition of a brake device used in the elevator apparatus in Embodiment 2 of the present invention.
Figure 7 is a timing chart to explain the abnormal-time control condition of a brake device used in the elevator apparatus in Embodiment 2 of the present invention.
Figure 8 is a flowchart to explain the control procedure of the brake device by the second control section of the elevator apparatus in Embodiment 2 of the present invention.
Figure 9 is a flowchart to explain the car deceleration reducing control by the second control section of the elevator apparatus in Embodiment 2 of the present invention.

Description of Embodiments

Embodiments to carry out the present invention will be described with the aid of the accompanying drawings. Incidentally, in each of the drawings, like numerals refer to like or corresponding parts and overlaps of description of these parts are appropriately simplified or omitted.

Embodiment 1

Figure 1 is a basic block diagram of an elevator apparatus in Embodiment 1 of the present invention.
In Figure 1, reference numeral 1 denotes a commercial power source. This commercial power source 1 is provided in a building where the elevator is provided. Reference numeral 2 denotes a traction machine. This traction machine 2 is provided in the shaft of the elevator. A sheave (not shown) is provided in this traction machine 2. A main rope 3 is wound on this sheave like a well bucket. A car 4 and a counterweight 5 are connected to both ends of this main rope 3. The car 4 and the counterweight 5 are arranged within the shaft. And the car 4 and the counterweight 5 have the function of running in the reverse directions due to the rotary driving of the traction machine 4.
And the traction machine 2 is provided with a rotation detector 6. This rotation detector 6 comprises an encoder, a resolver and the like. This rotation detector 6 has the function of detecting the rotation speed of the traction machine 2. Furthermore, the traction machine 2 is provided with a brake device 7. This brake device 7 is provided with a brake coil 8. This brake device 7 has the function of generating a braking force for the rotation of the traction machine 2 because of the de-energization of the brake coil 8. In addition, the brake device 7 has the function of releasing the braking force to the rotation of the traction machine 2 because of the energization of the brake coil 8.
And a car door 9 is provided at the entrance of the car 4. A car door switch 10 is provided in a position corresponding to the car door 9. This car door switch 10 has the function of detecting the open and closed condition of the car door 9. In contrast to this, each hall is provided with a hall door 11. Hall door switches 12 are provided in positions corresponding to these hall doors 11. These hall door switches 12 have the function of detecting the open and closed condition of the hall door 11. And a door zone sensor 13 is provided in the upper part of the car 4. These door zone sensors 13 have the function of detecting that the car 4 is in a position in which the car 4 is capable of opening the door.
And a control panel 14 is provided between the commercial power source 1 and the traction machine 2. This control panel 14 is provided with a power converter 15, a main circuit relay 16, a brake relay 17, a first control section 18, and a first input/output section 19. The power converter 15 is provided between the commercial power source 1 and the traction machine 2. This power converter 15 has the function of converting the power inputted from the commercial power source 1 and outputting the converted power to the traction machine 2. The main circuit relay 16 is provided between the commercial power source 1 and the power converter 15. This main circuit relay 16 has the function of keeping and cutting off power supply from the commercial power source 1 to the power converter 15. The first control section 18 has the function of performing various kinds of arithmetic processing for performing the elevator operation control.
The first input/output section 19 has the function for the input of detection signals of the rotation detector 6, the car door switch 10, the hall door switch 12, and the door zone sensor 13. And the first input/output section 19 has the function of outputting each kind of detection signal to the first control section 18. Furthermore, the first input/output section 19 has the functions of outputting command signals to the power converter 15, the main circuit relay 16, and the brake relay 17 on the basis of the calculation result of the first control section 18 and of controlling the current flowing in the brake coil 8.
Incidentally, in recent years there has been a movement afoot to make it obligatory to protect users from a run with door open in which the car 4 runs, with the car door 9 and the hall door 11 kept open. Therefore, in this embodiment, the configuration is such that the function of protection during a run with door open can be easily added. A description will be given below of a configuration for adding the function of protection during a run with door open.
Figure 2 is a general block diagram to explain the case where the function of protection during a run with door open is added to the elevator apparatus of Figure 1.
In the case where the function of protection during a run with door open is added to the elevator apparatus, as shown in Figure 2, a second control section 20 and a second input/output section 21 are detachably attached to the control panel 14. The second control section 20 has the function of performing various kinds of arithmetic processing for controlling the brake device 7 during the detection of an abnormality.
As with the first input/output section 19, the second input/output section 21 has the function for the input of detection signals of the rotation detector 6, the car door switch 10, the hall door switch 12, and the door zone sensor 13. And the second input/output section 21 has the function of outputting each kind of detection signal to the second control section 20 and the first input/output section 19.
In an elevator apparatus of such a configuration, in normal times, the calculation result of the first control section 18 is inputted to the second input/output section 21 via the fist input/output section 19. And on the basis of the calculation result of the first control section 18, the second input/output section 21 outputs command signals to the power converter 15, the main circuit relay 16, and the brake relay 17, and controls the current flowing in the brake coil 8.
On the other hand, when the second control section 20 has detected a run with door open on the basis of the actions of the door switches 10, 12 and the door zone sensor 13, the second input/output section 21 prioritizes the calculation result of the second control section 20 to the calculation result of the first control section 18 on its own determination. That is, when a run with door open has been detected, on the basis of the calculation result of the second control section 20, the second input/output section 21 outputs command signals to the power converter 15, the main circuit relay 16, and the brake relay 17, and controls the current flowing in the brake coil 8. As a result of this, the car 4 keeps the stop condition after a sudden stop.
Next, a more detailed description will be given of the configuration for adding the function of protection during a run with door open.
Figure 3 is a circuit configuration diagram of the inside of a control panel before the addition of the function of protection during a run with door open to the elevator apparatus in Embodiment 1 of the present invention. Figure 4 is a circuit configuration diagram of the inside of a control panel after the addition of the function of protection during a run with the door open to the elevator apparatus in Embodiment 1 of the present invention.
As shown in Figure 3, the first control section 18 is connected to the first input/output section 19 via a bus 22. This first control section 18 is provided with a flash ROM 23, a CPU 24, and a RAM 25. The flash ROM 23 is such that the contents thereof are kept even when the power source is cut off. This flash ROM 23 stores a program for the operation control of the elevator. The flash ROM 23 also has the function of keeping abnormal signals. The CPU 24 has the function of performing the operation control calculation of the elevator on the basis of program listed in flash ROM23. The RAM25 has the function of storing various variables which appear in the calculation process of the CPU 24.
On the other hand, the first input/output section 19 is provided with an input port 26 and an output port 27. Usually, the input port 26 comprises a resistor, a photocoupler and the like. This input port 26 has the function of capturing signals from the outside. Specifically, detection signals from the rotation detector 6, the door switches 10, 12, the door zone sensor 13, and the contact of main circuit relay 16 are inputted to the input port 26.
Furthermore, signals from a safety circuit 28 which goes into action in response to the action of a safety device which detects an abnormality of the elevator are inputted to the input port 26. In addition, other input signals 29 necessary for the operation control of the elevator are also inputted to the input port 26. Incidentally, the input port 26 has a margin in the number of ports. For this reason, it is ensured that the second input/output section 21 can be connected to the input port 26.
Usually, the output port 27 comprises a semiconductor switch and the like. This output port 27 has the function of outputting command signals to external equipment. Specifically, the output port 27 outputs command signals to the brake coil 8, the main circuit relay 16, and the brake relay 17. And the output port 27 also outputs other output signals 30 necessary for the operation control of the elevator. Incidentally, the output port 27 has a margin in the number of ports. For this reason, it is ensured that the second input/output section 21 can be connected to the output port 27.
And in the case where the function of protection during a run with door open is added, as shown in Figure 4, the second control section 20 and the second input/output section 21 are later attached. The second control section 20 and the second input/output section 21 are connected via another bus 31 which is different form the bus 22. As with the first control section 18, the second control section 20 is provided with a flash ROM 32, a CPU 33, and a RAM 34.
As with the first input/output section 19, the second input/output section 21 is provided with an input port 35 and an output port 36. The rotation detector 6, the door switches 10, 12, the door zone sensor 13, the contact of main circuit relay 16, and the safety circuit 28, which were connected to the input port 26 of the first input/output section 19, are connected to the input part 35. And the input port 35 is also connected to the output port 27 of the first input/output section 19. The brake coil 8, the main circuit relay 16, and the brake relay 17, which were connected to the output port 27 of the first input/output section 19, are connected to the output port 27. And the output port 36 is also connected to the input port 26 of the first input/output section 19.
Next, a description will be given of the actions of the elevator apparatus to which the function of protection during a run with door open is added.
Figure 5 is a flowchart to explain the action of protection of the elevator apparatus during a run with the door open in Embodiment 1 of the present invention.
The processing for the protection during a run with door open is periodically called within the second control section 20. Specifically, first, in Step S1 a determination is made as to whether or not the elevator is in a closed-door condition on the basis of the actions of the door switches 10, 12, When the elevator is in a closed-door condition, the processing at that period is finished.
In contrast to this, when the elevator is in an open-door condition, the flow of processing proceeds to Step S2. In Step S2, a determination is made as to whether or not the car 4 is present outside the door zone on the basis of the action of the door zone sensor 13. When the car is present inside the door zone, the processing at that period is finished. In contrast to this, when the car 4 is present outside the door zone, the flow of processing proceeds to Step S3.
In Step S3, a determination is made as to whether or not the car 4 has escaped from within the door zone on the basis of a change in the action condition of the door zone sensor 13. When the car 4 has escaped from the door zone, it is determined that a run with door open has occurred, and the flow of processing proceeds to Step S4. In Step S4, the second control section 20 outputs an OFF command to the main circuit relay 16, and the flow of processing proceeds to Step S5. In Step S5, the second control section 20 outputs an OFF command to the brake relay 17, and the flow of processing proceeds to Step S6. In Step S6, a detection flag of a run with door open is stored in the flash ROM 32, and the action at that period is finished.
On the other hand, when in Step S3 the escape of the car 4 from within the door zone is not detected, it is determined that the door has become open during the run, and the flow of processing proceeds to Step S7. In Step S7, the second control section 20 outputs an OFF command to the main circuit relay 16, and the flow of processing proceeds to Step S8. In Step S8, the second control section 20 outputs an OFF command to the brake relay 17, and the action at that period is finished.
According to Embodiment 1 described above, the second input/output section 21 and the second control section 20 are detachably attached to the control panel 14, And during a run with door open, the second control section 20 controls the brake device 7 in place of the first control section 18. For this reason, it is possible to add the function of controlling the brake device 7 during a run with door open to an ordinary elevator by a simple method. As a result of this, it is possible to ensure the sharing of the platform of the control panel 14 with a minimum change in the equipment configuration.
Specifically, the second control section 20 controls the brake device 7 so that the car 4 keeps the stop condition after a sudden stop. That is, the circuit configuration within the control panel 4 functions as a latch circuit in order to prevent the brake device 7 from going into action until release is performed by maintenance personnel. Because of this, the safety of the elevator passengers can be ensured.
Incidentally, in Embodiment 1, the configuration is such that external signals are inputted to the first input/output section 19 via the second input/output section 21. However, it is possible to adopt a configuration in which the wiring is branched and external signals are inputted to the first input/output section 19 and the second input/output section 21.

Embodiment 2

Figure 6 is a timing chart to explain the normal-time control condition of a brake device used in the elevator apparatus in Embodiment 2 of the present invention. Figure 7 is a timing chart to explain the abnormal-time control condition of a brake device used in the elevator apparatus in Embodiment 2 of the present invention. Incidentally, parts which are the same as in Embodiment 1 or corresponding parts bear like numerals and descriptions of these parts are omitted.
In Embodiment 1, the configuration is such that the action of protection during a run with door open is performed by adding the second input/output section 21 and the second control section 20. On the other hand, in Embodiment 2, the configuration is such that the car 4 goes into action with a prescribed deceleration by adding the second input/output section 21 and the second control section 20.
First, an outline of the control condition of the brake device 7 in normal times will be given with the aid of Figure 6.
In Figure 6, reference numeral 37 denotes the speed of the car 4. This speed 37 of the car 4 is obtained from the rotation detector 6. Reference numeral 38 denotes the acceleration of the car 4. This acceleration 39 of the car 4 is calculated from a change in the speed 37 of the car 4. Reference numeral 39 denotes the action condition of a semiconductor switch. This action condition 39 relates to a semiconductor switch of the output port 36 used in power supply to the brake coil 8. Reference numeral 40 denotes the action condition of the brake relay 17.
At the start of the elevator, the first control section 18 outputs commands for the action of the brake relay 17 and for brake suction via the first input/output section 19. As a result of this, at a time t0, the action condition 38 of the semiconductor switch and the action condition 40 of the brake relay 17 become an ON condition. That is, a current flows in the brake coil 8. As a result of this, the brake coil 8 is energized and the brake device 7 releases the braking force.
And after the release of the braking force of the brake device 7, the elevator performs an ordinary run. During an ordinary run, the speed 37 of the car 4 is not more than the threshold value VLIM which is set beforehand. And also the acceleration 38 of the car 4 is not more than the threshold value αL which is set beforehand. Under these conditions, the action condition 39 of the semiconductor switch and the action condition 40 of the brake relay 17 maintain the ON condition until the start of the elevator is released. Incidentally, in actuality, current control is performed so that a current of a prescribed value flows in the brake coil 8. For this reason, the action condition 39 of the semiconductor switch is controlled so as to repeat the ON condition and the OFF condition.
Next, an outline of the control condition of the brake device 7 in abnormal times will be given with the aid of Figure 7.
As shown in Figure 7, when at a time t1 an abnormality of the elevator is detected, the car 4 is about to stop suddenly because of the action of the safety device and the like. And at the same time with this, the main circuit relay 16 switches from the condition of keeping power supply to the traction machine 2 to the condition of cutoff. At this time, the torque of the traction machine 2 becomes 0 instantaneously. This results in an unbalanced condition of the car 4 and the counterweight 5. The speed 37 of the car 4 increases due to this imbalanced condition.
And when the detection signals of the safety circuit 28 and the main circuit relay 16 are inputted to the second input/output section 21, the second control section 20 brings the action condition 39 of the semiconductor switch into the OFF condition. As a result of this, the brake device 7 causes the braking force for the traction machine 2 to be generated, Because of this braking force, at a time t2, the acceleration 38 of the car 4 becomes not more than the threshold value αL. Under these conditions, the second control section 20 brings the action condition 39 of the semiconductor switch into the repeated ON/OFF condition so that the deceleration of the car 4 obtains a prescribed value. And at a time t4, the speed 37 of the car 4 becomes 0. At this time, the second control section 20 brings the action condition 40 of the brake relay 17 into the OFF condition, and the deceleration control is finished.
Next, a more detailed description will be given of a concrete control procedure of the brake device 7 by the second control section 20 with the aid of Figure 8.
Figure 8 is a flowchart to explain the control procedure of the brake device by the second control section of the elevator apparatus in Embodiment 2 of the present invention.
This processing is periodically called within the second control section 20. Specifically, first, an elevator start command is outputted from the first control section 18. And in Step S11, a determination is made as to whether or not a command for brake suction has been inputted to the second input/output section 21 via the first input/output section 19.
When a command for brake suction has been inputted to the second input/output section 21, the flow of processing proceeds to Step S12. In Step S12, current control is performed so as to output a switching pattern in which the current flowing in the brake coil 8 obtains an appropriate value to the semiconductor switch. After that, the flow off processing proceeds to Step S 13, where the semiconductor switch performs an ON/OFF action on the basis of the above-described switching pattern and the processing at that period is finished.
In contrast to this, when a command for brake suction is not inputted to the second input/output section 21 in Step 11, the flow of processing proceeds to Step S14. In Step S14, a determination is made as to whether or not the acceleration of the car 4 is not more than the threshold value α. When the acceleration of the car 4 is not more than the threshold value αL, it is determined that the deceleration of the car 4 is excessive. In this case, the flow of processing proceeds to Step S15, where deceleration control is performed so that the deceleration of the car 4 becomes constant. After that, the flow of processing proceeds to Step S13, where the semiconductor switch performs an ON/OFF action on the basis of the switching pattern by the above-described deceleration control, and the processing at that period is finished. On the other hand, the acceleration or the car 4 is larger than the threshold value αL in Step S14, the flow of processing proceeds to Step S16. In Step S16, the semiconductor switch is brought into the OFF condition, and the processing at that period is finished.
Next, with the aid of Figure 9, a description will be given of the case where the deceleration control of the car 4 is performed by the second control section 20.
Figure 9 is a flowchart to explain the car deceleration reducing control by the second control section of the elevator apparatus in Embodiment 2 of the present invention.
This processing is periodically called within the second control section 20. Specifically, at Step S21 a determination is made as to whether or not the speed of the car 4 is 0. When the speed of the car 4 is 0, the flow of processing proceeds to Step S22. In Step S22, timer rest and the initialization of speed limit values are performed as the initialization processing of variables. Specifically, the timer count t is returned to 0. And the limit speed value is returned from VMAX to VLIM.
After that, the flow of processing proceeds to Step S23, where a determination is made as to whether or not there is a command for brake suction. When there is a command for brake suction, the flow of processing proceeds to Step S24. In Step S24, the brake relay 17 is brought into the ON condition, and the processing at that period is finished. In contrast to this, when there is no command for brake suction in Step S23, the flow of processing proceeds to Step S25. In Step S25, the brake relay 17 is brought into the OFF condition, and the action is finished.
On the other hand, when at Step S21 the speed of the car 4 is not 0, the flow of processing proceeds to Step S26. In Step S26, a determination is made as to whether or not the detected condition of the door switches 10, 12 is the open-door condition and the detected condition of the door zone sensor 13 is the condition outside the door zone. In the case of the open-door condition and the condition outside the door zone, the flow of processing proceeds to Step S25, where the brake relay 17 is brought into the OFF condition and thereafter the processing at that period is finished.
In contrast to this, the case of the closed-door condition or the condition inside the door zone, the flow of processing proceeds to Step S27. In Step S27, a determination is made as to whether or not the absolute value of the speed of the car 4 is smaller than VLIM. When the absolute value of the speed of the car 4 is not less than VLIM, the speed of the car 4 is determined to be excessive. In this case, the flow of processing proceeds to Step S25, where the brake relay 17 is brought into the OFF condition and thereafter the processing at that period is finished.
In contrast to this, the absolute value of the speed of the car 4 is smaller than VLIM, the flow of processing proceeds to Step S28. In Step S28 a determination is made as to whether or not the timer count t is 0. When the timer count t is 0, the flow of processing proceeds to Step S29. In Step S29, a determination is made as to whether or not the acceleration of the car 4 is larger than the threshold value αL.
When the acceleration of the car 4 is larger than the threshold value αL, it is determined that the car 4 is during a normal run or during a sudden stop with a small deceleration. In this case, the flow of processing proceeds to Step S30, where the brake relay 17 is brought into the ON condition and the processing at that period is finished. On the other hand, when in Step S29 the acceleration of the car 4 is not more than the threshold value αL, the flow of processing proceeds to Step S31. In Step S31, the timer count t is incremented. After that, the flow of processing proceeds to Step S30, where the brake relay 17 is brought into the ON condition to perform deceleration control and the processing at that period is finished.
When in Step S28 the timer count t is not 0, the flow of processing proceeds to Step S32. In Step S32, a determination is made as to whether or not the timer count t is larger than a prescribed time tmax. When the timer count t is not more than a prescribed time tmax, it is recognized that there is a wasteful time until the generation of the braking force in the brake device 7. In this case, after the increment of the timer count t in Step S31, in Step S30 the brake relay 17 is brought into the ON condition to perform deceleration control and the processing at that period is finished.
In contrast to this, when in Step S32 the timer count t is larger than a prescribed time tmax, it is determined that the car 4 is in the deceleration-controlled condition. In this case, the flow of processing proceeds to Step S13, where a value obtained by subtracting V1, which corresponds to one period, from the limited speed value VLIM is regarded as a new limited speed value VLIM. After that, the flow of processing proceeds to Step S30, where the brake relay 17 is brought into the ON condition to perform deceleration control and the processing at that period is finished.
According to Embodiment 2 described above, when the safety circuit 28 is about to stop the car 4 suddenly, the second control section 20 controls the brake device 7 in place of the first control section 18 so that the deceleration of the car 4 becomes a prescribed deceleration. Furthermore, when the main circuit relay 16 has switched from the condition of keeping power supply to the traction machine 2 to the condition of cutoff, the second control section 20 controls the brake device 7 in place of the first control section 18 so that the deceleration of the car 4 becomes a prescribed deceleration. For this reason, it is possible to add the function of deceleration control to a usual elevator by a simple method. As a result of this, it is possible to ensure the sharing of the platform of the control panel 14 with a minimum change in the equipment configuration.
Incidentally, the present invention is not limited to Embodiments 1 and 2 and it is possible to obtain the same effect by adopting a configuration in which the brake device 7 is controlled by the second control section 20 during the detection of an abnormality. Specifically, the configuration is such that a detection section which detects an abnormality of the elevator is detachably provided in the control panel 14 and the brake device 7 is controlled by the second control section 20 in place of the first control section 18 during the detection of an abnormality by the detection section.

Industrial Applicability

As described above, the elevator apparatus of the present invention can be used in an elevator having a control panel which controls a brake device.

Description of symbols

1 commercial power source, 2 traction machine, 3 main rope, 4 car, 5 counterweight, 6 rotation detector, 7 brake device, 8 brake coil, 9 car door, 10 car door switch, 11 hall door, 12 hall door switch, 13 door zone sensor, 14 control panel, 15 power converter, 16 main circuit relay, 17 brake relay, 18 first control section, 19 first input/output section, 20 second control section, 21 second input/output section, 22 bus, 23 flash ROM, 24 CPU, 25 RAM, 26 input port, 27 output port, 28 safety circuit, 29 other input signals, 30 other output signals, 31 bus, 32 flash ROM, 33 CPU, 34 RAM, 35 input port, 36 output port, 37 speed of car, 38 acceleration of car, 39 action condition of semiconductor switch, 40 action condition of brake relay.

Claims

An elevator apparatus comprising:
a first control section which is provided on a control panel of an elevator and controls a brake device which brakes a traction machine which causes a car arranged in a shaft of the elevator to run;

a detection section which is detachably provided on the control panel and detects an abnormality of the elevator; and

a second control section which is detachably provided on the control panel and controls the brake device in place of the first control section during the detection of the abnormality by the detection section.
The elevator apparatus according to claim 1,
wherein on the basis of actions of a door zone sensor and a door switch, the detection section detects a run with door open, in which the car runs, with a door of the elevator kept open, and
wherein the second control section controls the brake device in place of the first control section so as to maintain the stop condition after the car stops suddenly during the detection of a run with door open by the detection section.
The elevator apparatus according to claim 1,
wherein the detection section detects the speed of the car and detects the action of a safety device which causes the car to stop suddenly when the abnormality occurs, and
wherein the second control section controls the brake device in place of the first control section so that a deceleration calculated from the speed of the car detected by the detection section becomes a prescribed value when the safety device is about to stop the car suddenly.
The elevator apparatus according to claim 1, further comprising:
a main circuit relay which performs keeping and cutting off of power supply to the traction machine,

wherein the detection section detects the speed of the car and the action of the main circuit relay, and

wherein the second control section controls the brake device in place of the first control section so that a deceleration calculated from the speed of the car detected by the detection section becomes a prescribed value when the main circuit relay switches from the condition of keeping power supply to the traction machine to the condition of cutoff.