JP2019110684A - Power conversion device - Google Patents

Abstract

To provide a power conversion device capable of eliminating influence of maintenance operation of equipment on a device life.SOLUTION: The power conversion device used to drive equipment includes: a first module (16) having a first main circuit unit used for normal operation; a second module (17) having a second main circuit unit used for maintenance operation; and a circuit switching unit (15) selectively connecting one of the first module and the second module to a load. When maintenance operation is set by maintenance switching means (12), which switches operation of the device to the maintenance operation, the circuit switching unit connects the second module to the load.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a power converter used for operating a device.

  A power conversion device such as an inverter device that controls a motor that operates equipment such as an elevator operates not only in normal operation but also in maintenance operation during maintenance. For this reason, the maintenance operation state also contributes to the life of the semiconductor switching element that constitutes the main circuit of the power conversion device.

  On the other hand, the prior art described in patent document 1 is known. In this prior art, the drive control unit for controlling the drive of the inverter is the MOSFET of the arm in which the speed command value is equal to or less than the speed in the maintenance operation mode, and the current direction detected by the current detection means is flowing in the forward direction of the diode element. The gate of the device is turned off, and a circulating current flows to the diode device side of the arm. As a result, it is possible to suppress the temperature rise and the rapid temperature fluctuation of the MOSFET element and to prolong the life of the MOSFET element.

International Publication No. 2014/030194

  However, in the prior art, the influence of the maintenance operation state on the life of the semiconductor switching element can be reduced. However, since the power converter itself operates in the normal operation and the maintenance operation, it is not possible to completely eliminate the influence on the life of the power converter accompanying the maintenance operation.

  Therefore, the present invention provides a power conversion device that can eliminate the influence of maintenance operation on the device life while using it for maintenance operation.

  In order to solve the above problems, a power conversion device according to the present invention is used for operating a device, and a first module having a first main circuit portion used for normal operation, and a first module used for maintenance operation 2) A second module having a main circuit section and a circuit switching section for selectively connecting one of the first module and the second module to a load, wherein the circuit switching section performs maintenance for switching the operation of the device to maintenance operation When the maintenance operation is set by the switching means, the second module is connected to the load.

  According to the present invention, since the life consumption of the first main circuit portion due to the maintenance operation can be suppressed, the influence of the maintenance operation on the device life can be eliminated.

  Problems, configurations, and effects other than those described above will be clarified by the description of the embodiments below.

The apparatus structure of the elevator system which is Embodiment 1 is shown. FIG. 1 is a front view showing an example of the appearance of a power conversion device according to a first embodiment. FIG. 6 is a flowchart showing switching means of the inverter module in the first embodiment. FIG. 10 is a flowchart showing switching means of the inverter module in the second embodiment. FIG. 14 is a flowchart showing switching means of the inverter module in the third embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings, those with the same reference numerals indicate components having the same configuration or similar functions.

Embodiment 1
FIG. 1 shows an apparatus configuration of an elevator system that is Embodiment 1 of the present invention.

  As shown in FIG. 1, the power conversion device according to the first embodiment includes a converter 2 for converting AC power of constant voltage and constant frequency from a three-phase AC power supply 1 (for example, a commercial power supply) into DC power; Conversion of a unit composed of a smoothing capacitor 3 for smoothing the DC voltage output by the converter and an inverter 4 for converting DC power input from the converter 2 (the diode rectifier in FIG. 1) into AC power of variable voltage and variable frequency Equipped with multiple sensor modules. The plurality of converter modules are divided into a first module group 16 consisting of one or more converter modules and a second module group 17 consisting of a smaller number or the same number of converter modules than the first module group.

  In each module group, a plurality of converter modules are connected in parallel. Therefore, since the power capacity of each module group is proportional to the number of converter modules, the total power capacity of the first module group 16 is equal to or more than the total power capacity of the second module group 17. In the first embodiment, of the normal operation and the maintenance operation of the elevator, the first module group 16 is used only for the normal operation and the second module group 17 is mainly used according to the magnitude of the total power capacity. Used for maintenance operation only.

  The number of converter modules in the first module group 16 and the second module group 17 is two and one in FIG. 1, respectively. , Any number is acceptable.

  As shown in FIG. 1, in the main circuit portion of the power conversion device including the first module group 16 and the second module group 17, three phases are provided via the circuit switching portion 15 and the electromagnetic contactor 19 on the AC side of the converter 2. An AC power supply 1 is connected, and a motor 6 serving as a load is connected to the AC side of the inverter 4 via the circuit switching unit 15. The circuit switching unit 15 provided in each of the input / output units of the power conversion device switches the group of modules used for driving the elevator. That is, of the first and second module groups between the first module group or the three-phase AC power supply 1 and the motor 6 by the circuit switching unit 15, the first module group 16 is selectively connected during normal operation. During the maintenance operation, the second module group 17 is selectively connected.

  The electromagnetic contactor 19 is connected between the circuit switching unit 15 and the three-phase alternating current power supply 1 on the input side of the power conversion device. The three-phase alternating current power supply 1 is turned on and off with respect to the power conversion device by the magnetic contactor 19.

  The inverter drive device 8 detects the rotation of the motor 6, for example, a signal from a rotary encoder and a current detector 5 for detecting the current of the motor 6, for example, a signal from a current transformer (CT) or the like. In response to this, a drive signal for driving and controlling the power conversion device is created. The semiconductor switching element (IGBT in FIG. 1) constituting the inverter 4 is turned on / off by a drive signal output from the inverter drive device 8 to convert direct current power into alternating current power and to supply it to the motor 6 . The motor 6 is driven at variable speed by AC power supplied from the power conversion device. When the motor 6 is driven, the car 11 and the counterweight 13 connected respectively to both ends of the main rope 10 wound around a hoisting machine (not shown) provided with the motor 6 are hoistways (not shown) Inside, they move up and down in opposite directions. Here, in the inverter drive device 8, the speed and position of the car 11 measured based on the detection signal of the rotation detector 7 and the current measurement value of the motor 6 indicated by the detection signal of the current detector 5 are respectively superior The drive signal for the power conversion device is created so as to match each command value created by the operation control device 9, which is a control device.

  The inverter drive device 8 monitors the operating state of the power conversion device, and transmits a state monitoring signal indicating the operating state of the power conversion device to the operation control device 9. Operation control device 9 issues a stop command to inverter drive device 8 when it is determined that an operation abnormality of the elevator system has occurred based on the state monitoring signal from inverter drive device 8 and the detection signal of rotation detector 7. Do. When the inverter drive device 8 receives the stop command, it opens the magnetic contactor 19 to cut off the power supply from the three-phase AC power supply to the power conversion device or stops the operation of the power conversion device. Is put into a braking state to stop the car 11.

  Furthermore, the inverter drive device 8 controls the circuit switching unit 15 to select one of the first module group 16 and the second module group 17 as a module group used to drive an elevator in the power conversion device. When maintenance work of the elevator is operated, when the maintenance work mode switching switch 12 provided in the operation panel or the like in the car 11 is operated, the operation control device 9 transmits a circuit switching command to the inverter drive device 8. When receiving the circuit switching command, the inverter drive device 8 controls the circuit switching unit 15 to select the second module group 17.

  Further, when an automatic diagnosis command signal is transmitted from the control center 40 to the elevator system via the communication network 30, the automatic diagnosis command signal is received by the remote maintenance monitoring device 14 and is operated from the remote maintenance monitoring device 14 It is sent to the controller 9. When receiving the automatic diagnosis instruction signal, the operation control device 9 transmits an automatic diagnosis operation instruction to the inverter drive device 8 and transmits a circuit switching instruction to the inverter drive device 8. The inverter drive device 8 controls the circuit switching unit 15 in response to the circuit switching command to select the second module group 17 and executes the automatic diagnostic driving in response to the automatic diagnostic driving command.

  Instead of the operation of the maintenance operation mode changeover switch 12, the elevator system may be set to the maintenance mode in accordance with a command from the control center 40. In this case, at the time of maintenance work, when the maintenance work start signal is transmitted from the elevator system to the control center 40 via the remote maintenance monitoring device or transmitted from the maintenance worker's portable terminal to the control center 40, control is performed. A maintenance command signal for setting the elevator system to the maintenance mode is transmitted from the center 40 to the elevator system via the communication network 30. The maintenance command signal is received by the remote maintenance monitoring device 14 and sent from the remote maintenance monitoring device 14 to the operation control device 9. When receiving the maintenance command signal, the operation control device 9 transmits a circuit switching command to the inverter drive device 8 as in the case where the maintenance operation mode switch 12 is operated.

  In the first embodiment, the inverter drive device 8, the operation control device 9, and the remote maintenance monitoring device 14 are all configured mainly by an arithmetic processing device such as a microcomputer, and the arithmetic processing device executes a predetermined program. By doing this, the functions as described above are provided. The control center 40 is mainly constituted by a computer system, and is installed at a geographically distant place from the installation place of the elevator system. The control center 40 remotely monitors the operation of a plurality of elevator systems, including the elevator system shown in FIG. 1 as well as other elevator systems not shown.

  As described above, the power conversion device according to the first embodiment includes two main circuits selectively connected between the first module group 16 and the second module group 17, that is, the motor 6 and the three-phase AC power supply 1. A first module group 16 or one main circuit section is used for a normal operation for carrying an elevator user, and a second module group or the other main circuit section is used for a maintenance operation during maintenance work. The first module group 16 is not used for maintenance operation. That is, the main circuit of the power conversion device is modularized into a main circuit unit used for normal operation and a main circuit unit used for maintenance operation. Thus, the life of the power converter for the elevator, that is, the lifetime of the power converter to the normal operation of the elevator is consumed by the aging operation of the first module group 16, that is, one of the main circuit parts. It is not consumed by the aging operation of the module group 17, that is, the other main circuit portion. That is, the lifetime of the power converter for driving the elevator is not consumed by the maintenance operation. Therefore, the influence of the maintenance operation on the device life can be eliminated while using the power conversion device for the maintenance operation.

  FIG. 2 is a front view showing an example of the appearance of the power conversion device in the first embodiment.

  As shown in FIG. 2, in the power conversion device according to the first embodiment, a plurality of converter modules 16A to 16F and 17A to 17C are stored in the case 50. These nine transducer modules are arranged three each in the longitudinal direction and the lateral direction. In addition, six converter modules 16A to 16F constitute a first module group 16 used for normal operation, and three converter modules 17A to 17C constitute a second module group 17 used for maintenance operation. Do.

  The converter module is inserted into the housing 50 from the front part of the housing 50, and is electrically connected to wiring conductors (not shown) in the housing 50 not shown. The six converter modules 16A to 16F are connected in parallel via wiring conductors to constitute a first module group 16. Further, the three converter modules 17A to 17C are connected in parallel via the wiring conductors to constitute a second module group 17. At the front of the housing 50, the panel surface of the transducer module is exposed. In addition, a pilot lamp, a power switch, etc. may be provided on the panel surface.

  In the case 50, in addition to the converter module, the circuit switching unit 15, the electromagnetic contactor 19, and the inverter drive device 8 shown in FIG. 1 are stored.

  In the first embodiment, as described above, the main circuit of the power conversion device is modularized into a main circuit unit used for normal operation and a main circuit unit used for maintenance operation. Furthermore, as shown in FIG. 2, these main circuit units are each composed of a plurality of converter modules. Thus, power converters of various power capacities can be configured by adjusting the number of unit converter modules. For example, in the power conversion device shown in FIG. 2, according to the power capacity of the power conversion device, four converter modules 16A to 16D constitute a first module group 16, and two converter modules 17A to 17B. The second module group 17 can be configured. In this case, the opening of the housing 50 at the position of the converter modules 16E, 16F, and 17C in FIG. 2 may be closed by a panel member that constitutes the panel surface of the converter module.

  In addition, since the main circuit unit is composed of a plurality of converter modules, when checking or maintaining a part of the main circuit unit of the power conversion device, the converter module of the target portion is extracted from the case 50 and the operation is performed. It should be applied. This facilitates maintenance and inspection of the power conversion device.

  The number of converter modules constituting the first and second module groups can be appropriately set according to the desired power capacity.

  Next, the switching operation of the main circuit unit of the power conversion device, that is, the module group in the first embodiment will be described.

  Here, the first module group 16 is used for normal operation by a customer delivered from an elevator system supplier. In addition, the second module group 17 is used by the maintenance worker for maintenance work (including automatic diagnosis operation). Therefore, in the following description, the “first module group 16” and the “second module group 17” will be referred to as “customer use inverter module” and “maintenance dedicated inverter module”, respectively.

  FIG. 3 is a flowchart showing switching means of the inverter module in the first embodiment. Hereinafter, description will be made with reference to FIG. 1 as appropriate.

  In step S20, the power conversion device starts the switching operation of the inverter module. Following step S20, step S21 is executed.

  In step S21, the operation control apparatus 9 (FIG. 1) determines whether or not the maintenance work mode changeover switch 12 has been operated by the operation of the maintenance worker when maintenance work of the elevator is performed. If it is determined that the maintenance work mode changeover switch 12 is operated (Y in step S21), step S23 is executed, and if it is determined that the maintenance work mode changeover switch 12 is not operated (N in step S21), Step S22 is performed.

  In step S23, the inverter drive device 8 (FIG. 1) switches the circuit switching unit 15 so that the maintenance dedicated inverter module ("17" in FIG. 1) is selected according to the command from the operation control device 9. Control. After step S23, step S24 is performed.

  In step S24, the elevator is driven by the maintenance-dedicated inverter module, and the maintenance operation is performed. During maintenance work, relatively high-load special operations may be carried out, but also in this case, no burden is placed on the customer-used inverter module.

  When the maintenance operation is completed, the inverter drive device 8 stops the operation of the maintenance dedicated inverter module. This stops the elevator.

  Further, in step S22, the operation control device 9 receives a command from the control center 40 (FIG. 1) and determines whether the execution of the automatic diagnosis operation is set by the remote maintenance monitoring device 14 (FIG. 1). . When the automatic diagnosis operation is performed (Y in step S22), the above-described steps S23, S24, and S27 are sequentially performed. If the automatic diagnosis operation is not performed (N in step S22), then step S25 is performed.

  In step S25, the inverter drive device 8 (FIG. 1) switches the circuit switching unit 15 so that the customer's inverter module ("16" in FIG. 1) is selected according to the command from the operation control device 9. Control. Following step S25, step S26 is executed.

  In step S26, the elevator is driven by the customer-use inverter module, and normal operation is performed.

  When the normal operation is completed, the inverter drive device 8 stops the operation of the customer-use inverter module. This stops the elevator.

  As described above, according to the power conversion device in the first embodiment, the main circuit is modularized into the main circuit unit used for normal operation and the main circuit unit used for maintenance operation. While using the converter for maintenance operation, it is possible to eliminate the influence of maintenance operation on the device life.

  If the second module group 17 in the first embodiment, that is, the maintenance-dedicated inverter module is owned by the maintenance worker, the reliability of the power conversion device is improved for the elevator owner without increasing the facility cost. .

  Not only at the time of maintenance operation but also at the time of automatic diagnosis operation, rescue operation, operation at the nearest floor, and at the time of failure of the customer-use inverter module as described later, the elevator may be driven using the maintenance dedicated inverter module. This prevents an increase in life consumption of the customer-use inverter module used during normal operation.

Embodiment 2
Next, a second embodiment of the present invention will be described. In addition, the structure of the elevator system of this Embodiment 2 is the same as that of Embodiment 1 shown in FIG. In the following description, the “first module group 16” and the “second module group 17” in FIG. 1 are respectively referred to as “customer inverter module” and “maintenance dedicated inverter” as in the case of the above-mentioned FIG. Described as a module.

  Also in the second embodiment, as in the first embodiment, during normal operation, the elevator is driven using the customer-use inverter module. If the customer-use inverter module fails during normal operation, for example, in the case of an open failure of the IGBT, the inverter drive device 8 (FIG. 1) measures the abnormal current with the current detector 5 (FIG. 1), the customer-use inverter module It determines with it being abnormal, opens the magnetic contactor 19 (FIG. 1), and interrupts | blocks the electric power supply to three-phase alternating current power supply 1 (FIG. 1) to a power converter device.

  Further, the inverter drive device 8 sends an elevator operation state signal to the operation control device 9 (FIG. 1) and, when measuring an abnormal current, sends an abnormality detection signal to the operation control device 9 (FIG. 1). When receiving the abnormality detection signal, the operation control device 9 uses the remote maintenance monitoring device 14 (FIG. 1) to communicate the communication network 30 with the elevator status signal and the abnormality detection signal at the time of abnormality detection, ie, when the customer inverter module fails. It sends to the control center 40 (FIG. 1) via (FIG. 1).

  The control center 40 monitors the elevator system abnormality by the elevator status signal sent from the elevator system side, so the elevator status signal at the failure of the customer inverter module causes the elevator inverter signal to be at fault. Stop failure can be recognized remotely. In addition, when the elevator user is confined in the car 11 (FIG. 1), a control member (center member) who operates the control center 40 talks with the user in the car, As soon as the safety confirmation is made, the control center 40 sends a switching command of the circuit switching unit 15 to the remote maintenance monitoring device 14 via the communication network 30. The switching command received by the remote maintenance monitoring device 14 is sent to the inverter drive device 8 through the operation control device 9. When receiving the switching command, the inverter drive device 8 operates the circuit switching unit 15 (FIG. 1) to change the inverter module used for driving the elevator from the customer-use inverter module to the maintenance-dedicated inverter module. Furthermore, the inverter drive 8 closes the magnetic contactor 19. As a result, the elevator can be driven, and the elevator stop can be restored.

  FIG. 4 is a flow chart showing switching means of the inverter module in the second embodiment.

  At step S31, the elevator is in a normal operation state by the customer-use inverter module.

  In step S32, the operation control device 9 determines whether a failure has occurred in the elevator. If no failure occurs (N in step S32), the normal operation (step S31) is continued. If a failure has occurred (Y in step S32), step S33 is executed.

  In step S33, the control center 40 uses the remote maintenance monitoring device 14 to confirm the failure state of the elevator. Following step S33, step S34 is executed.

  In step S34, the control center 40 determines whether the cause of the elevator stop failure is the inverter module. If the cause is not the inverter module (N in step S34), the process ends (step S47). If the cause is the inverter module (Y in step S34), then step S35 is executed.

  In step S35, the control center 40 determines the presence or absence of a user (trapper) in the car 11 based on the operation state immediately before the failure (for example, the presence or absence of a car call, the presence or absence of an in-car load, etc.) If there is a user, the communication device in the control center 40 is automatically connected to the intercom installed in the car 11 (Y in step S35), and the process proceeds to step S36. If there is no user (N in step S35), the process proceeds to step S39.

  In step S36, the control staff of the control center 40 calls the user in the car 11 for safety confirmation using the communication device and the interphone, and confirms the presence or absence of a response to the call. If there is a response (Y in step S36), step S37 is executed. When there is no response (N in step S36), steps S42 to S46 are sequentially executed.

  In step S37, the controller announces to the user in the car 11 that the elevator is to be restarted using the communication device and the interphone. Thereby, the user in the car 11 can be given a sense of security.

  Next, when it is determined in step S38 that the user in the car 11 has accepted the announcement in step S37 (Y in step S38), the control person executes step S39 next. If the user's approval can not be confirmed (N in step S38), the announcement is continued (step S37). Here, if it is determined that the situation in the car 11 is in a panic state from the situation of the elevator user and the voice in the car 11, the control personnel may have a secondary failure associated with the restart (for example, the car (11) Continue to call and announce, as there is a risk of triggering a door failure) due to the act of opening the door from the inside.

  In step S39, the controller transmits a switching command of the circuit switching unit 15 instructing the remote maintenance monitoring device 14 to switch the inverter module used for driving the elevator to the maintenance dedicated inverter module in the control center 40. Perform the manual operation of.

  Next, in step S40, the control center 40 sends a switching command to the remote maintenance monitoring device 14 in response to the manual operation of the controller in step S39.

  Next, in step S41, the elevator is restarted, and low-speed operation and rescue operation can be performed using the maintenance dedicated inverter module. When step S41 is executed, the series of processing ends (step S47).

  In step S36, when there is no response in the car 11 to the controller's call (N in step S36), next, step S42 is executed.

  In step S42, the control person urgently communicates the state of the user in the car 11 to the stop and failure elevator manager by telephone or e-mail.

  Next, in step S43, in the same manner as in step S40, the control center 40 sends a switching command to the remote maintenance monitoring device 14 according to the manual operation of the control personnel. Step S43 may be executed before step S42 or may be executed simultaneously with step S42.

  Next, in step S44, the elevator is restarted to enable operation using the maintenance dedicated inverter module.

  Next, in step S45, the inverter drive device 8 controls the maintenance-dedicated inverter module in the automatic operation mode set in advance to move the car 11 to the reference floor or a predetermined floor.

  Next, at step S46, the inverter drive device 8 controls (stops operation of) the maintenance-dedicated inverter module to suspend the car 11 at the reference floor or a predetermined floor. As a result, the manager who has received an emergency notification from the control personnel can check the state in the car and can cope with it promptly. When step S46 is executed, the series of processing ends (step S47).

  If it is determined in step S35 described above that there are no users in the car 11 (N in step S35), steps S36 to S38 are skipped without being executed, and the above-described steps S39, S40, and S41 are sequentially executed. Ru.

  A maintenance operation (not shown) is carried out after step S47 (processing end) in FIG. 4 to repair the failed customer inverter module. The elevator can be driven by the maintenance-dedicated inverter module and the transportation of the user can be continued until the repair of the customer-made inverter module is completed. Thereby, the operation stop time of the elevator can be reduced.

  Also, as shown in FIG. 2, when the customer-use inverter module is composed of a plurality of converter modules, it is possible to use a converter module that constitutes a maintenance-dedicated inverter module instead of the failed converter module. . That is, by using a non-faulty converter module of a customer-use inverter module and a converter module that constitutes a maintenance dedicated module in parallel connection and using it, the same operation as in normal operation using a normal customer-use inverter module Under conditions, the elevator can be driven. That is, after restarting, it is possible to continue the normal operation.

  In this case, the circuit switching unit 15 controlled by the inverter drive device 8 converts each of the plurality of converter modules (for example, nine converter modules in FIG. 2) constituting the power conversion device into a three-phase AC power supply. It is configured to be able to connect or disconnect between the motors. Also, by detecting the output current of each converter module in the customer inverter module, it is possible to determine the presence or absence of a failure for each converter module based on the detected current.

  In the case where the configuration of the power conversion device shown in FIG. 2 is applied as described above, when a failure occurs in the customer-use inverter module, a failure in the customer-use inverter module can be obtained by using the converter module in the maintenance dedicated inverter module. Since the burden on the normal converter modules is not increased, the lifetime consumption of these converter modules is not increased.

  Further, according to the second embodiment, even if the power conversion device fails, the elevator can be operated using the maintenance-dedicated inverter module. Therefore, the maintenance worker does not take emergency action immediately after stopping the elevator. , Can cope with the failure.

Embodiment 3
Next, a third embodiment of the present invention will be described. In addition, the structure of the elevator system of this Embodiment 3 is the same as that of Embodiment 1 shown in FIG. In the following description, the “first module group 16” and the “second module group 17” in FIG. Described as a dedicated inverter module for maintenance.

  In the third embodiment, switching is automatically performed by the remote maintenance monitoring device 14 (FIG. 1) instead of switching of the inverter module by the manual operation of the controller in the second embodiment described above.

  In the third embodiment, the remote maintenance monitoring device 14 that has received an abnormality detection signal from the operation control device 9 (FIG. 1) when the elevator is stopped due to a failure of the customer-use inverter module executes the predetermined program. Automatically analyze whether or not restoration is possible by switching to another and automatically perform safety confirmation to the user in the car 11 according to the presence or absence of the user in the car 11 and then issue a switching command .

  FIG. 5 is a flowchart showing the switching means of the inverter module in the third embodiment.

  At step S51, the elevator is in a normal operation state by the customer-use inverter module.

  In step S52, the operation control device 9 determines whether a failure has occurred in the elevator. If no failure occurs (N in step S52), the normal operation (step S51) is continued. If a failure has occurred (Y in step S52), step S53 is executed.

  In step S53, the remote maintenance monitoring device 14 diagnoses the failure state of the elevator. After step S53, step S54 is executed.

  In step S54, the remote maintenance monitoring device 14 determines whether the cause of the elevator stop failure is the inverter module or not by the automatic diagnosis in step S53. If the cause is not the inverter module (N in step S54), the process ends (step S66). If the cause is the inverter module (Y in step S54), then step S55 is executed.

  In step S55, the remote maintenance monitoring device 14 displays the inside of the car 11 based on the operation state (for example, the presence or absence of a car call, the presence or absence of an in-car load, etc.) immediately before the failure acquired from the operation control device 9 (FIG. 1). If the user is present (Y at step S55), the process proceeds to step S56, and if the user is not present (N at step S55), the process proceeds to step S59.

  In step S56, the remote maintenance monitoring device 14 automatically uses the intercom provided in the car 11 to automatically restart the elevator in response to the operation of the (optional) push button provided in the car 11. Make an announcement. Thereby, the user in the car 11 can be given a sense of security.

  Next, in step S57, the remote security monitoring device 14 determines whether the push button has been pressed. This makes it possible to check whether or not the user's condition in the car is abnormal, such as whether the user in the car can understand the content of the announcement. If there is depression (Y at step S57), step S58 is executed. When there is no response (N in step S57), steps S61 to S65 are sequentially executed.

  In step S58, the remote maintenance monitoring device 14 uses the intercom provided in the car 11 to automatically announce that the elevator is to be restarted.

  Next, in step S59, the remote maintenance monitoring device 14 transmits a switching command instructing switching of the inverter module used for elevator driving to the inverter driving device 8 via the operation control device 9.

  Next, in step S60, the inverter drive device 8 operates the circuit switching unit 15 according to the received switching command to switch the inverter module for driving the elevator from the customer-use inverter module to the maintenance-dedicated inverter module. Thus, the elevator is restarted as in the second embodiment (step S41 in FIG. 4). When step S60 is executed, the series of processing ends (step S66).

  When it is determined in step S57 that the push button has not been pressed (N in step S57), step S61 is subsequently executed.

  In step S61, the remote maintenance monitoring device 14 automatically notifies the elevator manager that there is no reaction of the user in the car 11 to the announcement in step S56 and that some abnormality has occurred in the user. (Anomaly report).

  Next, at step S62, the remote maintenance monitoring device 14 sends a switching command for switching the inverter module used for driving the elevator via the operation control device 9 as in the case of the above-mentioned step S59. Send to Step S62 may be performed before step S61, or may be performed simultaneously with step S61.

  Next, in step S63, the elevator is restarted as in step S59 described above, and operation using the maintenance-dedicated inverter module becomes possible.

  Next, at step S64, the inverter drive device 8 controls the maintenance dedicated inverter module in a preset automatic operation mode to move the car 11 to the reference floor or the predetermined floor.

  Next, at step S65, the inverter drive device 8 controls (stops operation of) the maintenance-dedicated inverter module to suspend the car 11 at the reference floor or the predetermined floor. As a result, the administrator who has received the automatic notification from the remote maintenance monitoring device 14 can confirm the state in the car and can promptly deal with it. When step S65 is executed, the series of processing ends (step S66).

  If it is determined in step S55 described above that there is no user in the car 11 (N in step S55), steps S56 to S58 are skipped without being executed, and the above-described steps S59 and S60 are sequentially executed.

  As in the second embodiment, maintenance work is performed after step S66 (processing end) in FIG. 5, but the operation stop time of the elevator can be reduced by driving the elevator with the maintenance dedicated inverter module.

  Also, as in the second embodiment, when the customer-use inverter module is composed of a plurality of converter modules (FIG. 2), the customer-use inverter module that has not failed and the converter module that constitutes the maintenance dedicated module are connected in parallel. By connecting and using it, the elevator can be driven under the same operating conditions as during normal operation using a normal customer-use inverter module.

  The power conversion device in each of the above-described embodiments can be used not only for an elevator but also for driving an apparatus (for example, an electric apparatus such as an air conditioner) capable of switching between normal operation and maintenance operation.

  The present invention is not limited to the embodiment described above, and includes various modifications. For example, the embodiments described above are described in detail to explain the present invention in an easy-to-understand manner, and are not necessarily limited to those having all the configurations described. In addition, it is possible to add, delete, and replace another configuration for part of the configuration of each embodiment.

  For example, the converter 2 (FIG. 1) in the main circuit of the power conversion device is not limited to a diode rectifier, but may be a semiconductor switching element having a regenerative function. Moreover, the semiconductor switching element which comprises the inverter 4 may be not only IGBT but MOSFET etc. Further, the motor and the power converter may be installed in the machine room or may be installed in the hoistway.

  In addition, when testing that requires more than normal operation power capacity, the customer inverter module and maintenance dedicated inverter module are used to increase the power capacity of the power converter, and the customer inverter module is minimally required for normal operation. It may be a power capacity.

1 Three-phase AC power supply 2 Converter 3 Smoothing capacitor 4 Inverter 5 Current detector 6 Motor 7 Rotation detector 8 Inverter drive 9 Operation control device 10 Main rope 11 Car 12 Maintenance operation mode switch 13 Counterweight 14 Remote maintenance monitoring device DESCRIPTION OF SYMBOLS 15 Circuit switching part 16 1st module group 16A, 16B, 16C, 16D, 16E, 16F converter module 17 2nd module group 17A, 17B, 17C converter module 19 electromagnetic contactor 30 communication network 40 control center 50 case

Claims (7)

A power converter used to operate a device,
A first module having a first main circuit unit used for normal operation;
A second module having a second main circuit unit used for maintenance operation;
A circuit switching unit that selectively connects one of the first module and the second module to a load;
Equipped with
The power conversion device according to claim 1, wherein the circuit switching unit connects the second module to the load when the maintenance operation is set by the maintenance switching unit switching the operation of the device to the maintenance operation. The power converter according to claim 1, wherein
The power conversion device according to claim 1, wherein the circuit switching unit does not connect the first module to the load when the maintenance operation is set by the maintenance switching unit. The power converter according to claim 1, wherein
The power converter according to claim 1, wherein the first module is not used for the maintenance operation. The power converter according to claim 1, wherein
The power conversion device, wherein the maintenance switching means is a maintenance work mode switching switch provided in the device. The power converter according to claim 1, wherein
The circuit switching unit is characterized in that when the first module fails during the normal operation, the second module is connected to the load by switching means by remote control, automatic control, or manual control. Power converter. The power converter according to claim 1, wherein
The first module comprises a plurality of transducer modules,
The power converter according to claim 1, wherein the second module comprises one or more of the converter modules. The power converter according to claim 6, wherein
When the first module fails during the normal operation, the converter module in the second module is used instead of the failed converter module in the first module, and the normal conversion in the first module is performed. A power converter characterized in that the normal operation is continued by using a power supply module together.

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