JP2013143830A - Elevator controller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an elevator controller having a pre-damage detection function of a regenerative resistor.SOLUTION: The elevator controller comprises: a regenerative resistor 10 consuming the regenerative power from a motor 5; a switching element 11 for switching current conduction to the regenerative resistor 10; a DC voltage measuring section 13 for measuring the value of a voltage flowing to an inverter 4 and calculating the value of a current being conducted to the regenerative resistor 10 from the voltage value; a voltage measuring section 12 for measuring the value of a voltage flowing to the regenerative resistor 10; and a comparison determination section 14 for comparing a reference voltage preset based on the value of a current being conducted to the regenerative resistor 10 that is calculated by the DC voltage measuring section 13 with a voltage value measured by the voltage measuring section 12.

Description

  Embodiments described herein relate generally to an elevator control device having a function of detecting regenerative resistance before breakage.

  In the conventional elevator control device, when the elevator performs a regenerative operation, the regenerative power returns to the inverter device, so that the DC voltage across the smoothing capacitor increases. Whether or not the switching element mounted on the inverter device reaches a preset threshold value by a temperature sensor is monitored so as not to be damaged by heat generation.

  However, when monitoring with a temperature sensor is performed in this way, it is necessary to install a temperature sensor in the control device. When the number of regenerative resistors installed in the control device is large, it is difficult to detect the temperature rise of the regenerative resistor that is far from the temperature sensor, and it is impossible to detect an abnormality before breakage of the regenerative resistor.

JP 2009-142103 A

  An object of the embodiment of the present invention is to provide an elevator control device capable of detecting an abnormality before a regenerative resistor is broken.

  In order to achieve the above object, an elevator control apparatus according to an embodiment of the present invention includes a converter that rectifies a power supply voltage supplied from an AC power supply to obtain a rectified voltage, and smoothes the rectified voltage to obtain a DC voltage. A smoothing capacitor and a switching element are bridge-connected, the DC voltage is switched by PWM control by the switching element, an inverter that converts the DC voltage to an AC having a desired frequency and a desired voltage, and a regenerative resistor that consumes regenerative power from the motor A switching element that switches current application to the regenerative resistor, a voltage value that flows through the inverter, a DC voltage measurement unit that calculates a current value that is supplied to the regenerative resistor from the voltage value, and the regenerative device A voltage measuring unit for measuring a voltage value flowing through the resistor, and the regenerative resistor calculated by the DC voltage measuring unit. A comparison / determination unit that compares a reference voltage value set in advance based on a current value to be energized and a voltage value measured by the voltage measurement unit, wherein the comparison / determination unit and the reference voltage value When it is determined that there is a difference of a predetermined value or more between the voltage value, it is determined that an abnormality has occurred in the regenerative resistor.

It is a mimetic diagram showing composition of an elevator control device concerning a 1st embodiment of the present invention. It is a schematic diagram which shows the characteristic change of the elevator control apparatus which concerns on the 1st Embodiment of this invention. It is a schematic diagram which shows the structure of the elevator control apparatus which concerns on the 2nd Embodiment of this invention. It is a schematic diagram which shows the structure of the elevator control apparatus which concerns on the 3rd Embodiment of this invention. It is a schematic diagram which shows the structure of the elevator control apparatus which concerns on the 4th Embodiment of this invention. It is a schematic diagram which shows the structure of the elevator control apparatus which concerns on the 5th Embodiment of this invention. It is a schematic diagram which shows the lifetime change of the switching element which concerns on the 5th Embodiment of this invention.

  Embodiments of the present invention will be described below with reference to the drawings. The externally connected device does not constitute an elevator control device.

(First embodiment)
FIG. 1 is a schematic diagram illustrating a configuration of an elevator control device according to a first embodiment of the present invention. FIG. 2 is a schematic diagram illustrating a change in characteristics of the elevator control device according to the first embodiment of the present invention.

  First, the configuration of the elevator control device according to the first embodiment of the present invention will be described with reference to FIG.

  As shown in FIG. 1, the elevator control apparatus according to the first embodiment smoothes the voltage rectified by the converter 2 that receives AC power from the three-phase AC power supply 1 and rectifies the DC power, and sets it as a DC voltage. A smoothing capacitor 3 and an inverter 4 for converting the DC voltage into an AC voltage having a desired frequency and a desired voltage are provided.

  The voltage converted by the inverter 4 is applied to the motor 5, and the motor 5 raises and lowers the car 6 provided in the hoistway via a rope. A counterweight 7 is suspended from the other end of the rope from which the car 6 is suspended. The car 6 is provided with a destination floor registration device 8 for registering the destination floor of the passenger and a load detection device 9 for measuring the load in the car.

  Further, the elevator control apparatus according to the present embodiment is connected in series with the regenerative resistor 10 for consuming electric power generated when the elevator performs a regenerative operation, and ON / OFF at a predetermined timing. A switching element 11 that performs control is provided.

  Furthermore, a voltage measuring unit 12 that measures the voltage between the collector and the emitter of the switching element 11 and a DC voltage measuring unit 13 that measures the DC voltage of the inverter 4 are provided.

  Further, it is connected to the voltage measuring unit 12 and the DC voltage measuring unit 13, and depends on the current value supplied between the collector and the emitter of the switching element 11 calculated from information from the voltage measuring unit 12 and the DC voltage measuring unit 13. A comparison / determination unit 14 is provided for comparing the collector-emitter voltage with a determination reference value predetermined by an external input device. The comparison determination unit 14 is connected to a reference voltage setting unit 15 that externally sets a collector-emitter voltage of the switching element 11 serving as a comparison reference value to be compared in the comparison determination unit 14.

  As shown in FIG. 2, the reference voltage setting unit 15 sets the relationship between the current value (collector current) energized in the inverter 4 and the collector-emitter voltage. That is, when the collector current calculated by the DC voltage measuring unit 13 is a, the collector-emitter voltage measured by the voltage measuring unit 12 is a.

  The reference voltage setting unit 15 is connected by a maintenance staff or the like when setting a comparison reference value to be compared with the comparison determination unit 14.

  A control microcomputer 16 is connected to the comparison determination unit 14. The control microcomputer 16 calculates the collector-emitter voltage based on the current value supplied between the collector and the emitter of the switching element 11 calculated from the information from the voltage measurement unit 12 and the DC voltage measurement unit 13 from the comparison determination unit 14. The result of comparison and determination with a reference value determined in advance by the external input device is received from the comparison determination unit 14. And the control microcomputer 16 is controlling the inverter 4 so that the operation of the elevator based on this determination result may be performed.

  When the control microcomputer 16 determines that there is an abnormality in the regenerative resistance based on the determination result, the control microcomputer 16 is connected to an abnormality notification unit 17 that notifies the abnormality to the outside.

  Next, the operation of the elevator control device according to the first embodiment will be described.

  First, the basic operation until the car 6 is raised and lowered will be described. As described above, in the elevator control apparatus according to the first embodiment, the AC voltage supplied from the three-phase AC power source 1 is rectified by the converter 2, and the voltage rectified by the converter 2 is DC voltage by the smoothing capacitor 3. To be smoothed. The DC voltage smoothed by the smoothing capacitor 3 is switched by PWM control by an inverter 4 having a switching element bridge-connected, and converted to an AC voltage having a desired frequency and a desired voltage.

  Then, the motor 5 is driven by the AC voltage converted into a desired voltage, and the car 6 and the counterweight 7 in the hoistway are moved up and down.

  Next, the operation of the elevator control device according to this embodiment will be described.

  First, the control microcomputer 16 determines whether the operation state of the elevator is a regenerative operation or a power running operation based on information obtained from the destination floor registration device 8 and the load detection device 9 installed in the car 6 before the elevator operation. Hereinafter, in the present embodiment, a case where regenerative operation is performed will be described.

  When it is determined that the regenerative operation is performed, the DC voltage measuring unit 13 calculates the value of the current flowing through the regenerative resistor 10 from the measured DC voltage value. Further, the voltage measuring unit 12 measures the voltage between the collector and the emitter when a current is passed through the switching element 11 through the regenerative resistor 10. The voltage measurement unit 12 inputs the measured voltage value to the comparison determination unit 14.

  In the comparison / determination unit 14, the reference voltage setting unit 15 sets the relationship between the current value supplied to the regenerative resistor 10 calculated by the DC voltage measurement unit 13 and the voltage value measured by the voltage measurement unit 12. And the difference is calculated. When the regenerative resistor 10 is abnormal due to a disconnection or the like, the collector current supplied to the switching element 11 is different from that in the normal state, so that a difference also occurs in the collector-emitter voltage. Specifically, when the regenerative resistor 10 is normal, the collector current is a and the collector-emitter voltage is also a. However, when the regenerative resistor 10 is abnormal such as disconnection, the collector current increases to b. Along with this, the collector-emitter voltage also increases to b. Based on this difference between the normal value and the abnormal value, the abnormality of the regenerative resistor 10 can be determined.

  The allowable range of this difference is set in advance by the reference voltage setting unit 15 in advance, and the comparison / determination unit 14 determines whether or not this difference exceeds the allowable range. Is output to the control microcomputer 16. If the difference is outside the allowable range, the control microcomputer 16 determines that the regenerative resistor 10 is abnormal, outputs an abnormal signal to the abnormality notification unit 17, and outputs the abnormality notification unit 17. Reports anomalies to the outside.

  As described above, by measuring the DC voltage flowing through the inverter 4 and the collector-emitter voltage of the switching element 11 connected in series with the regenerative resistor 10, the collector-emitter voltage corresponding to the DC current flowing through the inverter is measured. Whether or not the regenerative resistor 10 is abnormal can be determined from the determination result. Therefore, replacement work can be performed by maintenance personnel or the like before the failure of the regenerative resistor 10 occurs.

(Second Embodiment)
Next, a second embodiment will be described. FIG. 3 is a schematic diagram showing a configuration of an elevator control apparatus according to the second embodiment of the present invention. The configuration of the elevator control device according to the present embodiment includes, in addition to the configuration of the elevator control device according to the first embodiment described above, a stop time detection unit that detects a time during which the operation of the elevator is stopped, and the switching element 11. And a gate control unit for controlling the switching operation. Since other configurations are the same as those of the first embodiment, description thereof is omitted.

  First, the configuration of the elevator control device according to the present embodiment will be described. The control microcomputer 16 is connected to a stop time detector 18 that detects the time during which the operation of the elevator is stopped. A gate control unit 19 that performs switching control of the switching element 11 based on the detected stop time of the elevator is connected to the stop time detection unit 18.

  Next, the operation of the elevator control device according to this embodiment will be described.

  When the stop time information of the elevator is received from the control microcomputer 16 that controls the operation of the elevator and it is determined that the stop time is stopped for a preset time, the stop time detection unit 18 performs gate control on the determination result. To the unit 19. The gate control unit 19 turns on the switching element 11 and energizes the regenerative resistor 10 when the elevator stops for a preset time. The subsequent operation is the same as that of the first embodiment.

  Specifically, first, the DC voltage measuring unit 13 calculates the value of the current flowing through the regenerative resistor 10 from the measured DC voltage value. Further, the voltage measuring unit 12 measures the voltage between the collector and the emitter when a current is passed through the switching element 11 through the regenerative resistor 10. The voltage measurement unit 12 inputs the measured voltage value to the comparison determination unit 14.

  In the comparison / determination unit 14, the reference voltage setting unit 15 sets the relationship between the current value supplied to the regenerative resistor 10 calculated by the DC voltage measurement unit 13 and the voltage value measured by the voltage measurement unit 12. And the difference is calculated. When the regenerative resistor 10 is abnormal due to a disconnection or the like, the collector current supplied to the switching element 11 is different from that in the normal state, so that a difference also occurs in the collector-emitter voltage. Based on this difference between the normal value and the abnormal value, the abnormality of the regenerative resistor 10 can be determined.

  The allowable range of this difference is set in advance by the reference voltage setting unit 15 in advance, and the comparison / determination unit 14 determines whether or not this difference exceeds the allowable range. Is output to the control microcomputer 16. If the difference is outside the allowable range, the control microcomputer 16 determines that the regenerative resistor 10 is abnormal, outputs an abnormal signal to the abnormality notification unit 17, and outputs the abnormality notification unit 17. Reports anomalies to the outside.

  As described above, by measuring the DC voltage flowing through the inverter 4 and the collector-emitter voltage of the switching element 11 connected in series with the regenerative resistor 10, the collector-emitter voltage corresponding to the DC current flowing through the inverter is measured. Whether or not the regenerative resistor 10 is abnormal can be determined from the determination result. Therefore, replacement work can be performed by maintenance personnel or the like before the failure of the regenerative resistor 10 occurs.

(Third embodiment)
Next, a third embodiment will be described. FIG. 4 is a schematic diagram showing the configuration of an elevator control apparatus according to the third embodiment of the present invention. The configuration of the elevator control device according to the present embodiment is corrected in consideration of the change in the voltage amount between the collector and the emitter due to the temperature rise of the switching element 11 in addition to the configuration of the elevator control device according to the first embodiment described above. It has the composition to do. Since other configurations are the same as those of the first embodiment, description thereof is omitted.

  First, the configuration of the elevator control device according to the present embodiment will be described. An internal temperature prediction unit 20 that predicts a temperature rise inside the switching element 11 is connected to the destination floor registration device 8 and the load detection device 9. The internal temperature prediction unit 20 predicts the temperature rise value in the switching element 11 based on the operation information obtained from the destination floor registration device 8 and the load in the car 6 obtained from the load detection device 9, and the prediction result is converted into temperature. It is set to output to the correction unit 21.

  The temperature sensor 22 is set to measure the temperature around the switching element 11 and to output the measurement result to the temperature correction unit 21.

  The temperature correction unit 21 is connected to the internal temperature prediction unit 20 and the temperature sensor 22 and corrects the change in the voltage value between the collector and the emitter of the switching element 11 due to the temperature increase predicted by the internal temperature prediction unit 20.

  Next, the operation of the elevator control device according to this embodiment will be described.

  First, the internal temperature prediction unit 20 predicts a current value to be supplied to the switching element 11 by signals from the destination floor registration device 8 and the load detection device 9 before the elevator is operated. Then, the amount of heat generated inside the switching element 11 is calculated from the predicted current value and the operation time of the elevator.

  Here, since the switching element 11 changes its voltage value between the collector and the emitter when energized due to its own heat generation, it is necessary to consider the ambient temperature and heat generation amount of the switching element 11.

  Therefore, in the present embodiment, the abnormality of the regenerative resistor 10 can be detected more accurately by correcting the change in the voltage value by the temperature correction unit 21. Hereinafter, the correction of the voltage value will be described.

  The temperature correction unit 21 detects the voltage value between the collector and the emitter of the switching element 11 when the internal temperature of the switching element 11 is predicted by the internal temperature prediction unit 20, and the ambient temperature of the switching element 11 measured by the temperature sensor 22. From these values, a correction value for correcting the voltage value between the collector and the emitter actually measured by the voltage measurement unit 12 is calculated. Then, the temperature correction unit 21 outputs the calculated correction value to the comparison determination unit 14. The comparison determination unit 14 to which the correction value is input calculates the correction voltage value by giving the correction value to the voltage value between the collector and the emitter of the switching element 11 actually measured by the voltage measurement unit 12.

  The comparison / determination unit 14 compares the collector-emitter voltage value of the regenerative resistor 10 corresponding to the current value supplied to the regenerative resistor 10 calculated by the DC voltage measuring unit 13 with the above-described correction voltage value. The voltage value difference is calculated. When the regenerative resistor 10 is abnormal due to a disconnection or the like, the collector current supplied to the switching element 11 is different from that in the normal state, so that a difference also occurs in the collector-emitter voltage. Based on this difference, the abnormality of the regenerative resistor 10 can be determined.

  The allowable range of this difference is set in advance by the reference voltage setting unit 15 in advance, and the comparison / determination unit 14 determines whether or not this difference exceeds the allowable range. Is output to the control microcomputer 16. If the difference is outside the allowable range, the control microcomputer 16 determines that the regenerative resistor 10 is abnormal, outputs an abnormal signal to the abnormality notification unit 17, and outputs the abnormality notification unit 17. Reports anomalies to the outside.

  As described above, by measuring the DC voltage flowing through the inverter 4 and the collector-emitter voltage of the switching element 11 connected in series with the regenerative resistor 10, the collector-emitter voltage corresponding to the DC current flowing through the inverter is measured. Whether or not the regenerative resistor 10 is abnormal can be determined from the determination result. In addition, according to the present embodiment, by correcting the voltage value between the collector and the emitter of the switching element 11 due to the heat generated inside the switching element 11 that is generated in accordance with the operation of the elevator, the abnormality of the regenerative resistor 10 can be more accurately detected. The presence or absence can be determined.

(Fourth embodiment)
Next, a fourth embodiment will be described. FIG. 5 is a schematic diagram showing a configuration of an elevator control apparatus according to the fourth embodiment of the present invention. The configuration of the elevator control device according to the present embodiment includes, in addition to the configuration of the elevator control device according to the first embodiment described above, a fan that cools the regenerative resistor 10, a fan control unit that controls driving of the fan, and fan drive control. A fan control setting unit for determining a reference voltage value to be controlled by the unit. Since other configurations are the same as those of the first embodiment, description thereof is omitted.

  This embodiment demonstrates the case where the some regenerative resistance is installed in the elevator control apparatus. If one of the regenerative resistors is damaged during normal operation of the elevator, the voltage is concentrated on other normal regenerative resistors. For this reason, the amount of heat generated by a normal regenerative resistor is abnormally increased only by breaking one regenerative resistor, and the life of those regenerative resistors is shortened. Therefore, according to the present embodiment, even if one of the regenerative resistors is damaged, the elevator control device can appropriately cool other normal regenerative resistors. Details will be described below.

  First, the configuration of the elevator control device according to the present embodiment will be described. The fan control unit 23 is connected to a control microcomputer 16 that controls the operation of the elevator. The fan 24 connected to the fan control unit 12 is disposed at a location where the regenerative resistor 10 can be cooled. In addition, a fan control setting device 25 is connected to the fan control unit 23 from the outside by maintenance personnel or the like. The fan control setting device 25 is for predetermining a control amount when the fan 24 is controlled by the fan control unit 23, and a maintenance person determines the cooling amount of the regenerative resistor 10 by the fan 24 by the fan control setting device 25. Can be determined.

  Next, the operation of the elevator control device according to this embodiment will be described.

  When one of the plurality of regenerative resistors (the regenerative resistor 10 in this embodiment) becomes an abnormal state due to disconnection or the like, the collector-emitter of the switching element 11 connected in series with the regenerative resistor 10 that has become an abnormal state. The voltage value between them rises more than normal. Therefore, in this embodiment, the reference voltage setting unit 15 inputs in advance to the comparison determination unit 14 the abnormality reference determination voltage value between the collector and the emitter of the switching element 11 when the regenerative resistor 10 is in an abnormal state.

  The voltage measurement unit 12 measures the voltage value between the collector and the emitter of the switching element 11 and outputs the measurement result to the comparison determination unit 14. The comparison determination unit 14 compares the measurement result input from the voltage measurement unit 12 with the abnormality determination reference voltage value input in advance by the reference voltage setting unit 15, and the collector-emitter measured by the voltage measurement unit 12. Whether or not the regenerative resistor 10 is in an abnormal state is determined from the voltage value between them. When it is determined that the regenerative resistor 10 is in an abnormal state, an abnormal signal is output to the control microcomputer 16. The control microcomputer 16 that has received the abnormal signal outputs a fan control command to the fan control controller 23. The fan control unit 23 to which the control command has been issued drives and controls the fan 24 in accordance with the control adjustment determined in advance by the fan control setting unit 25. And the fan 24 installed in the location which can cool regenerative resistance can cool normal regenerative resistance other than the regenerative resistance which became an abnormal state.

  From the above, even if one of the regenerative resistors installed in the elevator control device is in an abnormal state, the fan can prevent abnormal heat generation of other normal regenerative resistors. Can protect the life of regenerative resistance.

(Fifth embodiment)
Next, a fifth embodiment will be described. FIG. 6 is a schematic diagram showing the configuration of an elevator control apparatus according to the fifth embodiment of the present invention. FIG. 7 is a schematic diagram showing a change in the lifetime of the switching element according to the fifth embodiment of the present invention. The configuration of the elevator control device according to the present embodiment is the switching measured by the voltage measurement unit 12 when the operation is performed in the initial state of the elevator in addition to the configuration of the elevator control device according to the first embodiment described above. The storage unit stores a voltage value between the collector and the emitter of the element 11 and a voltage correction unit that corrects a fluctuation in the voltage value between the collector and the emitter resulting from the life of the switching element 11. Since other configurations are the same as those in the first embodiment, description thereof is omitted.

  First, the configuration of the elevator control device according to the present embodiment will be described with reference to FIG. The comparison determination unit 14 is connected to a storage unit 26 that stores an initial voltage value measured by the voltage measurement unit 12 when the elevator is operated in an initial state. The comparison / determination unit 14 is connected to a voltage correction unit 27 that corrects a fluctuation in the voltage value between the collector and the emitter resulting from the life of the switching element 11. The voltage correction unit 27 is further connected to the reference voltage setting unit. 15 is connected. That is, since the voltage correction unit 27 and the reference voltage setting unit 15 are connected, the collector current and the collector-emitter voltage predetermined by the reference voltage setting unit 15 as shown in FIG. The relationship can be corrected to the relationship at the time of life progression.

  Next, the operation of the elevator control device according to this embodiment will be described.

  First, the elevator is operated in an initial state such as when the elevator is shipped or installed on a property, and the initial voltage value a of the collector-emitter voltage is measured by the voltage measuring unit 12. The measured initial voltage value a is input to the comparison determination unit 14 and stored in the storage unit 26 connected to the comparison determination unit 14.

  Here, when the switching element 11 is deteriorated due to its life, the characteristics of the collector-emitter voltage change compared to the initial state. That is, the collector-emitter voltage increases even when the current supplied to the switching element 11 is the same collector current as in the initial state, as in the life progression shown in FIG. Here, when the initial voltage is a, the lifetime progressing voltage is b.

  Next, the comparison / determination unit 14 informs the reference voltage setting unit 15 of the relationship between the current value supplied to the regenerative resistor 10 calculated by the DC voltage measurement unit 13 and the voltage value measured by the voltage measurement unit 12. And the difference is calculated. The allowable range of this difference is set in advance by the reference voltage setting unit 15 in advance, and the comparison / determination unit 14 determines whether this difference exceeds the allowable range. When it is determined that the difference exceeds the allowable range, it is determined that the effect is due to the life of the switching element 11, and the result is output to the voltage correction unit 27. Then, the voltage correction unit 27 corrects the characteristics of the collector-emitter voltage during the life progression shown in FIG. Then, based on the relationship between the collector current value calculated by the DC voltage measuring unit 13 and the corrected collector-emitter voltage during the life progression, the regenerative resistor 10 is calculated from the voltage value measured by the voltage measuring unit 12. It is determined whether or not there is an abnormal state.

  As a result, even when the life of the switching element 11 is progressing, it is possible to appropriately determine whether or not the regenerative resistor 10 is abnormal based on the collector-emitter voltage characteristics at the time of life advancement, and before the failure of the regenerative resistor 10 occurs. Replacement work can be performed by maintenance personnel or the like.

DESCRIPTION OF SYMBOLS 1 ... Three-phase alternating current power supply 2 ... Converter 3 ... Smoothing capacitor 4 ... Inverter 5 ... Motor 6 ... Car 7 ... Counterweight 8 ... Destination floor registration device 9 ... Load detection device 10 ... Regenerative resistor 11 ... Switching element 12 ... Voltage measurement part DESCRIPTION OF SYMBOLS 13 ... DC voltage measurement part 14 ... Comparison determination part 15 ... Reference voltage setting part 16 ... Control microcomputer 17 ... Abnormality alarm part 18 ... Stop time detection part 19 ... Gate control part 20 ... Internal temperature prediction part 21 ... Temperature correction part 22 ... Temperature sensor 23 ... Fan control unit 24 ... Fan 25 ... Fan control setting unit 26 ... Storage unit 27 ... Voltage correction unit

Claims (5)

A converter that rectifies a power supply voltage supplied from an AC power source to obtain a rectified voltage;
A smoothing capacitor that smoothes the rectified voltage to a DC voltage;
A switching element is bridge-connected, the DC voltage is switched by PWM control by the switching element, and an inverter that converts the DC voltage to an AC having a desired frequency and a desired voltage;
A regenerative resistor that consumes regenerative power from the motor;
A switching element for switching current application to the regenerative resistor;
A DC voltage measuring unit that measures a voltage value flowing through the inverter and calculates a current value that is supplied to the regenerative resistor from the voltage value;
A voltage measuring unit for measuring a voltage value flowing through the regenerative resistor;
A comparison / determination unit that compares a reference voltage value set in advance based on a current value supplied to the regenerative resistor calculated by the DC voltage measurement unit and a voltage value measured by the voltage measurement unit;
With
The elevator control apparatus which judges that abnormality has generate | occur | produced in the said regenerative resistance, when the said comparison judgment part judges that the difference more than predetermined value has arisen between the said reference voltage value and the said voltage value.   The apparatus according to claim 1, wherein when the operation of the elevator stops for a preset time, the switching element is turned on to supply current to the regenerative resistor, and the comparison determination unit determines whether the regenerative resistor is abnormal. The elevator control device described. Based on the elevator car load and destination floor registration information, an internal temperature prediction unit that predicts in advance the current value to be passed through the switching element and predicts the internal heating value of the switching element from the predicted current value;
A temperature correction unit that corrects the voltage value measured by the voltage measurement unit based on the predicted internal heating value of the switching element;
An elevator control device according to claim 1. A cooling fan for cooling the regenerative resistor;
The elevator control device according to claim 1, wherein the driving of the cooling fan is variably controlled according to a value of a voltage value flowing through the regenerative resistor measured by the voltage measurement unit. A storage unit for storing a voltage value measured by the voltage measurement unit when the elevator is operated in an initial state as an initial voltage value;
A voltage correction unit that corrects a voltage value flowing through the regenerative resistor when it is determined that the lifetime of the switching element is;
An elevator control device according to claim 1.

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