JP4259211B2 - Motor drive device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a motor drive device, and more particularly to a motor drive device capable of displaying in detail the protection factors detected by a plurality of types of protection detection function units.
[0002]
[Prior art]
The motor drive device usually has a plurality of types of protection detection function units, and has a function of displaying the generated protection factor on the display unit when the protection function is operated. There are a number of protection function parts such as overcurrent protection, overvoltage protection, and overheat protection in the protection function part of the motor drive unit. When these protection function parts are activated, the information is displayed on the display. This is used to investigate the cause of the protection function operation.
[0003]
FIG. 4 is a diagram showing a protection factor display method of a conventional motor driving device.
The conventional motor driving device includes a plurality of, here two protection detection function units 101 and 102 that detect several protection factors, and a logical sum function unit 103 that collects outputs of these protection detection function units 101 and 102. A protection function unit 104 that operates when a protection factor is detected, and a display 105 that displays the protection function operation are provided.
[0004]
The protection detection function units 101 and 102 are provided corresponding to overcurrent protection, overvoltage protection, overheat protection, and the like. For example, in the case of overcurrent protection, a plurality of sensor outputs respectively disposed on the overcurrent detection target are protection factors. Is entered as There may be one or more protection factors for the protection function to operate. However, when at least one of the protection detection function units 101 and 102 detects a protection factor, the output of the logical sum function unit 103 is The protection function unit 104 performs an operation such as stopping the motor driving device and causes the display 105 to display that the protection function has been operated. At this time, on the display device 105, which protection detection function unit 101, 102 has been operated is displayed with an abbreviated symbol.
[0005]
As described above, the conventional motor driving device performs only the operation display of the protection functions roughly classified such as overcurrent protection and overvoltage protection in the display function related to protection (see, for example, Patent Document 1). At the time of repair, troubleshooting was performed in combination with the status display (information) of the motor drive device when the protective operation occurred, and the true cause was estimated.
[0006]
[Patent Document 1]
Japanese Utility Model Publication No. 5-4783 (FIG. 6)
[0007]
[Problems to be solved by the invention]
However, the conventional motor drive device was able to get to know the broadly classified protection with the protection display function, but there was no way to see the information by factor that the motor drive device has There was a problem that troubleshooting was not efficient.
[0008]
On the other hand, the protection function has been subdivided, and if the protection display is divided into factors for each detection stage, there are problems that the display types of the protection operation increase, become complicated, and troubleshoot becomes complicated.
[0009]
The present invention has been made in view of the above points, and in the case of simple troubles, it is possible to perform troubleshooting by identifying protection functions equivalent to conventional ones and information of motor drive devices, as in the past, and more complicated. In the case of a trouble, an object is to provide a motor drive device that can check detailed factors and enable correct troubleshooting.
[0010]
[Means for Solving the Problems]
In the present invention, in order to solve the above problems, in the motor drive apparatus provided with a display for displaying a protection factor that occurred with a number or symbol, the DC intermediate attached to one of the lines connecting the converter circuit and an inverter circuit An overcurrent detection sensor having a sensor for detecting an overcurrent of the current and a sensor for detecting an overcurrent of the phase current attached to one of the lines connecting the inverter circuit and the motor, and detecting an overheat of the inside air temperature An overheat detection sensor having a sensor for detecting overheating of the cooling fin attached to the cooling fin of the inverter circuit, and the protection factor detected by the protection detection function unit the displayed but number or symbol corresponding to the protective factors classified whether the overheat protection or an over current protection major classification to Is displayed on a protection factor layering means with a number or symbol to be displayed on the display unit corresponding to said protection factor is switched hierarchically the protection factors small classification based on hierarchical display instruction, the protection factor hierarchical And a display switching operation key that receives the hierarchical display instruction of the protection factors classified by the means and outputs the instruction to the protection factor hierarchical means .
[0011]
According to such a motor drive device, the protection factor hierarchizing means can hierarchize the protection factors and display them on the display unit when the protection function is operated. As a result, in addition to the protection detection information equivalent to the conventional technology, it is possible to display the protection factor information in a large classification and the protection factor information in a more detailed small classification, so that detailed causes can be easily identified and efficient. Enable trouble shooting.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is an explanatory view showing the principle of a motor drive device according to the present invention.
The motor drive device according to the present invention includes a plurality of protection detection function units 1a to 1n that detect protection factors, protection factor hierarchization means 2, and a display 3. Each of the protection detection function units 1a to 1n may detect a plurality of protection factors classified into the same type, or may detect only one type of protection factor. The protection factor hierarchization means 2 has a function of inputting the protection factors detected by the protection detection function units 1a to 1n and classifying them, and outputs the classified protection factors to the display 3 based on the display switching instruction. To do. In addition to displaying the operating states of the motor and the motor drive device, the display 3 displays the protection factors classified by the protection factor hierarchizing means 2 in a hierarchical manner.
[0013]
According to this motor drive device, in the case of a simple trouble, by displaying information specifying the protection detection function units 1a to 1n on the display 3, simple trouble shooting with information representing the operation state of the motor drive device is performed. In the case of a complicated trouble consisting of a plurality of protection factors, the protection detection function units 1a to 1n that have detected a plurality of protection factors and detailed protection factors can be sequentially displayed in a hierarchy on the display 3 and checked. Correct troubleshooting is possible.
[0014]
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings, taking as an example an inverter device for driving an induction machine.
FIG. 2 is a system diagram showing the configuration of the inverter device.
[0015]
The inverter device 10 includes a converter circuit 11 that rectifies by inputting a three-phase AC power supply, a capacitor 12 that converts the pulsating voltage rectified by the converter circuit 11 into a smoothed DC voltage, and switching elements. And an inverter circuit 13 that converts the DC voltage smoothed by the capacitor 12 into a three-phase AC voltage by switching elements, and the output of the inverter circuit 13 is connected to the motor 14.
[0016]
As a protection function of the inverter device 10 that drives the motor 14, for example, there are overcurrent protection and overheat protection. As a sensor for detecting an overcurrent in the inverter device 10, a sensor 15 that is attached to one of the lines connecting the converter circuit 11 and the inverter circuit 13 and detects an overcurrent of the DC intermediate current, the inverter circuit 13, and the motor 14. And a sensor 16 for detecting an overcurrent of the phase current. Further, as a sensor for detecting overheating, the sensor is provided in the inverter device 10 to detect overheating of the inside air temperature and attached to the cooling fin 18 of the inverter circuit 13 to detect overheating of the cooling fin 18. There is a sensor 19.
[0017]
The output of the sensor 15 that detects the overcurrent of the DC intermediate current is connected to the DC intermediate current overcurrent protection detector 20, and the output of the sensor 16 that detects the overcurrent of the phase current is the phase current overcurrent protection detector 21. The output of the sensor 17 for detecting overheating of the inside air temperature is connected to the inside air temperature overheat protection detector 22, and the output of the sensor 19 for detecting overheating of the cooling fin 18 is supplied to the cooling fin overheat protection detector 23. It is connected. The outputs of the DC intermediate current overcurrent protection detector 20, the phase current overcurrent protection detector 21, the inside air temperature overheat protection detector 22 and the cooling fin overheat protection detector 23 are connected to the controller 24. The controller 24 is connected to the output of the display switching operation key 25, and is further connected to a display 26 for displaying the operation state of the inverter device 10 and the protection factor. The indicator 26 is constituted by, for example, a 4-digit 7-segment light emitting diode (LED).
[0018]
The controller 24 includes a microprocessor, a random access memory, a read-only memory, an input / output interface circuit, and the like. In addition to the original control function for controlling the switching elements of the inverter circuit 13, the DC intermediate current overcurrent protection detector 20, The output signals of the phase current overcurrent protection detector 21, the inside air temperature overheat protection detector 22 and the cooling fin overheat protection detector 23 are inputted to perform the hierarchization processing of the protection factor, and the display switching operation of the hierarchized processing information is performed. A function of switching to the display device 26 based on the output signal of the key 25 is provided. The program for performing the protection factor hierarchization processing is stored in a read-only memory and executed.
[0019]
In the inverter device 10 having the above configuration, during normal operation, the input three-phase AC power supply is rectified by the converter circuit 11, smoothed by the capacitor 12, and converted to a DC power supply. This DC power supply is input to the inverter circuit 13, converted into a three-phase AC power supply by on / off control of the switching element by the controller 24, and supplied to the motor 14.
[0020]
During normal operation, the controller 24 causes the display 26 to display, for example, the output frequency of the three-phase AC output from the inverter device 10 to the motor 14. Here, when an overcurrent state or an overheat state occurs during the operation of the inverter device 10, the DC intermediate current overcurrent protection detector 20, the phase current overcurrent protection detector 21, the room temperature overheat protection detector 22, and the cooling An abnormality is detected by one of the fin overheat protection detectors 23. At this time, the controller 24 processes the information from the detector that has detected the abnormality, and the abnormality is classified as overcurrent protection or overheat protection in the protection function, and the classification result is displayed on the display 26. To display. Of course, the controller 24 that has detected the abnormality performs a protective operation such as, for example, stopping the inverter device 10. As for the details of the abnormality, the controller 24 displays information about the detector that has detected the abnormality on the display 26 by receiving a display switching instruction from the display switching operation key 25. Next, a specific display example of the display 26 will be described.
[0021]
FIGS. 3A and 3B are diagrams showing display examples of the display. FIG. 3A shows a display example during normal operation, and FIG. 3B shows a display example when an abnormality occurs.
The display on the display unit 26 displays the frequency of the three-phase AC output of the inverter device 10, for example, as shown in FIG. In the illustrated example, a numerical value is displayed on the display 26 that the frequency is “60 Hz”.
[0022]
In the case of an abnormality, the major classification of whether it is overcurrent protection or overheat protection is displayed with a symbol, and the specific protection factor is displayed with a code assigned to the sensors 15, 16, 17, and 19. ing.
[0023]
As for the large classification, “OC” is displayed in the case of overcurrent protection, and “OH” is displayed in the case of overheat protection. In addition, the sub-classification display for hierarchization includes “1” when overcurrent protection is detected due to overcurrent of the phase current, “2” when protection is performed due to overcurrent of the DC intermediate current, and overheat protection detection. Set to “1” for protection due to overheating of the inside air, and “2” for protection due to cooling fin overheating.
[0024]
Here, in the inverter device 10, the display 26 when the phase current overcurrent protection detector 21 receives the output signal from the sensor 16 for detecting the phase current and detects the overcurrent of the phase current to activate the protection function. A display example will be described. First, as shown in (B), the display 26 displays a large classification “OC”. Thereby, it is possible to know the occurrence of overcurrent protection and its factor. Further, by switching the hierarchized factors with the display switching operation key 25, a small classification “1” is displayed, and thereby, it can be specified that the source of overcurrent is phase current detection.
[0025]
According to this embodiment, the protection factor is hierarchized and displayed in stages, so that an LED display with a small amount of information, for example, a few digits can be used without using a liquid crystal (LCD) display with a large amount of information. Even detailed protection factor information can be displayed.
[0026]
In the above example, the protection factors are classified in the categories of overcurrent protection and overheat protection. However, the protection factors may be classified in a category such as a sensor installation location.
[0027]
【The invention's effect】
As described above, in the present invention, the protection function display is hierarchized. In the display when the protection function is activated, the protection factor is displayed in a hierarchy, so that in addition to the protection detection information equivalent to the conventional one, more detailed protection factor without increasing the classification difficulty of the broadly classified protection Since information can also be displayed, a detailed cause can be specified, and more efficient troubleshooting can be performed. Therefore, a motor drive device with excellent maintainability can be provided.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram showing the principle of a motor drive device according to the present invention.
FIG. 2 is a system diagram showing a configuration of an inverter device.
FIGS. 3A and 3B are diagrams showing a display example of a display, in which FIG. 3A shows a display example during normal operation, and FIG. 3B shows a display example when an abnormality occurs.
FIG. 4 is a diagram illustrating a protection factor display method of a conventional motor driving device.
[Explanation of symbols]
1a to 1n Protection detection function unit 2 Protection factor hierarchization means 3 Display 10 Inverter device 11 Converter circuit 12 Capacitor 13 Inverter circuit 14 Motor 15, 16, 17, 19 Sensor 18 Cooling fin 20 DC intermediate current overcurrent protection detector 21 Phase current overcurrent protection detector 22 Inside air temperature overheat protection detector 23 Cooling fin overheat protection detector 24 Controller 25 Display switching operation key 26 Indicator

Claims (2)

The motor drive apparatus provided with a display for displaying a protection factor that occurred with a number or symbol,
A sensor that is attached to one of the lines connecting the converter circuit and the inverter circuit to detect the overcurrent of the DC intermediate current and one of the lines that connects the inverter circuit and the motor to detect the overcurrent of the phase current. A protection comprising: an overcurrent detection sensor having a sensor for detecting overheat; an overheat detection sensor having a sensor for detecting overheating of an inside air temperature; and a sensor attached to a cooling fin of the inverter circuit for detecting overheating of the cooling fin. A detection function unit;
The protection the protective factors detected by the detecting function part is displayed on the display unit whether the overheat protection or an over-current protection with a number or symbol corresponding to the protective factors classified major classification to, layered A protection factor hierarchization means for hierarchically switching the protection factor to a small classification based on a display instruction, and causing the display to display the number or symbol corresponding to the protection factor ;
A display switching operation key that receives the hierarchization display instruction of the protection factors classified by the protection factor hierarchization means, and outputs to the protection factor hierarchization means;
Motor driving apparatus comprising: a. 2. The motor driving apparatus according to claim 1, wherein the protection factor hierarchizing means displays a major classification with a symbol and a minor classification with a code assigned to each sensor.

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