JPH08251934A - Inverter - Google Patents

Abstract

PURPOSE: To obtain an inverter in which initial value data can be written at the stage of delivery without requiring to complete the inverter previously for every specifications while enhancing the productivity and facilitating the maintenance. CONSTITUTION: When an external unit III1 is connected with a control section II through an interface section 7, a microcomputer 4 at the control section III identifies a copy unit based on a voltage signal and enters into a corresponding operational mode. When an initial value data writing command is delivered by operating a keyboard at the display/operating section of the external unit III1 and followed by an initial value data generated at the display/operating section, the data is temporarily stored in a RAM 6 before being written in an EEPROM 5 to be stored therein. Subsequently, an inverter performs control operation based on a data required for the operation among the initial value data written in the EEPROM 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inverter device for controlling an induction motor.

[0002]

2. Description of the Related Art Conventionally, in an inverter device, specification data is written in advance in a ROM as an initial value in accordance with specifications, and an operation panel is integrated and incorporated.

[0003]

As described above, in the structure for writing the data in the ROM, it is necessary to manufacture the control units according to the specifications in advance and combine the control units with the inverter main unit. Therefore, inventory management for each specification is required. Or
Or it had to be assembled. Further, since the data is fixedly written in the ROM, maintenance is not easy.

The present invention has been made in view of the above problems, and the purpose thereof is to be able to write initial value data at the shipping stage, and it is not necessary to complete the device for each specification in advance, and the productivity can be improved. It is an object of the present invention to provide an inverter device that can be improved and that is easy to maintain. The object of the invention of claim 2 is that, in addition to the object of the invention of claim 1, only by connecting an external device constituting a copy unit to the control part, writing of data to the EEROM of the control part, Another object is to provide an inverter device that can easily read out data during maintenance.

The object of the invention of claim 3 is, in addition to the object of the invention of claim 1, to provide an inverter device in which the specifications of the inverter device can be easily grasped during maintenance. The object of the invention of claim 4 is, in addition to the object of the invention of claim 1, the type of the external device to which the control means of the control part automatically connects only when the external device is connected to the interface part. It is to provide an inverter device that can identify

[0006]

In order to achieve the above object, according to the invention of claim 1, an inverter for switching a direct current to convert it into an alternating current power source and supplying the alternating current as a driving power source to an induction motor and a switching of this inverter. An inverter main part composed of a drive circuit for driving elements, an EEPROM in which data of specifications according to device specifications are written to the inverter main part, an interface part for connecting an external device, and an EEPROM The function of outputting a control signal to the drive circuit based on the written data and the operation data sent from the outside through the interface unit, the function of transferring the data written in the EEPROM to the outside through the reading interface unit, and the sending through the interface unit. EE the incoming data Characterized in that it consists of a control unit provided with the control means having a function of writing the ROM.

According to a second aspect of the present invention, in the first aspect of the invention, the external device transfers the data written in the EEPROM of the control section through the interface section, and simultaneously stores and holds the transferred data. It is characterized by comprising a copy unit provided with a memory unit for collectively holding and storing initial value data of specifications according to the specifications of an apparatus which is collectively transferred to the control unit through the interface unit and written in the memory of the control unit.

According to a third aspect of the present invention, in the first aspect of the present invention, the initial specification data written in the EEPROM of the control section and readable by the copy unit includes the relay specification used as an external contact and the rated voltage of the apparatus. , Rated capacity, manufacturing date, lot number, control means version, device unique number, and acceleration / deceleration time.

According to a fourth aspect of the present invention, in the first aspect of the present invention, the external device is provided with means for generating an electric signal indicating a type of the signal level, and the control means of the control section is incorporated through an interface section. It is characterized by having a function of A / D converting the electric signal of the external device and identifying the connected external device from the A / D converted value.

[0010]

According to the invention of claim 1, EEPRO of the control unit
Since the specification data can be sent to M from the outside through the interface section and written, the initial value data of the specifications according to the specifications is shipped to the EEPROM of the control section before the shipment after the control section and the inverter main section are combined. It becomes possible to write, so that it is not necessary to assemble the inverter device for each specification in advance, and the productivity is improved. Moreover, since the initial value data of the specifications written in the EERPOM can be sent out to the outside through the interface unit, it is possible to easily confirm the initial value data of the specifications of the inverter device at the time of maintenance or inspection. The change can be easily made by the above writing operation.

According to a second aspect of the invention, in the first aspect of the invention, the external device transfers the data written in the EEPROM of the control section through the interface section and collectively stores and holds the transferred data. Along with this, the copy unit is provided with a memory unit for holding and storing data of specifications according to the specifications of the device which is collectively transferred to the control unit through the interface unit and written in the memory of the control unit. By simply connecting to the interface part of, the data can be easily written to the EEPROM or the data read confirmation can be easily performed. Moreover, since the memory part that holds and stores the data is used, the data read on site can be stored in a remote place. Can be viewed at, and the creation of writing data can be done away from the site Because data confirmation work and data preparation work can be performed with good efficiency.

According to the invention of claim 3, the E of the control unit is
The data that is written in the EPROM and can be read by the copy unit is based on the relay specifications used as external contacts, rated voltage, manufacturing date, lot number, version of control means, rated capacity, device unique number, and acceleration / deceleration time. Since it is configured, it is easy to grasp the individual specifications of the inverter device, and therefore it is easy to take measures during maintenance.

According to the invention of claim 4, the external device is provided with means for generating an electric signal indicating a type of the signal level, and the control means of the control part receives the electric signal of the external device taken in through the interface part. A / D conversion is performed, and the function of identifying the connected external device based on the A / D converted value is provided. Therefore, by simply connecting the external device to the interface part, the control means of the control part is automatically connected to the external device. The device can be identified, and it is not necessary for the user to perform operations such as connection setting each time an external device is connected, which facilitates handling.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows the overall configuration of an embodiment of the present invention. The entire inverter device of this embodiment is roughly divided into an inverter main part I, a control part II, and an external device III ₁ ... I is, for example, full-wave rectified by a rectifier 1 in a three-phase commercial power source AC, and further smoothed by a smoothing capacitor C ₀ to convert a direct current into an alternating current, and supplies this alternating current output to the induction motor M as a drive power source. The drive circuit 3 drives each switching element of the inverter 2. In addition, a hall element that performs a load current flowing in the inverter 2 and a relay that forms an external contact for generating an alarm output to the outside when an abnormality is detected are installed.

The control unit II controls the inverter 2 through PWM through the drive circuit 3 to control the frequency and voltage of the alternating current output from the inverter 2, and its configuration is composed of a CPU or the like which constitutes the control means. Microcomputer 4 and EEPR in which initial value data of specifications required for control operation of the microcomputer 4 are written
An OM 5, a RAM 6 used for securing a work area and temporarily storing data, an interface section 7 for connecting an external device III, and a terminal having an abnormal output terminal for outputting an abnormal output to the outside and a terminal for external control. The microcomputer 4 is composed of a section 8 and a power source section (not shown), and the microcomputer 4 creates a frequency command based on an external frequency setting signal, an acceleration / deceleration time preset as specification data, and the like. A drive signal for driving each switching element of the inverter 2 through the drive circuit 3 of the inverter 2 by performing V / F calculation based on the frequency command to create a voltage command, creating a PWM signal by the frequency command and the voltage command. Or the detection output of a hall element (not shown) provided with the magnitude of the load current flowing in the induction motor M and the initial value data in advance. Control function such as used for control to stabilize the operation of the inverter 2 by calculating from the rated capacity, voltage, etc. which are set as described above, and for external output attached to the inverter main part I when the load current is abnormal. A monitoring function that activates a relay (not shown) to send an external alarm to the relay contact via the above-mentioned abnormal output terminal, and external control when the output frequency reaches a set value or during operation. An external control function of outputting an output through the terminal for external control, a function of controlling reading and writing of the EEPROM 5 and a data input / output of the interface section 7, and an interface section 7
It has a function of identifying the external device III ₁ ...

Here, the EEPROM 5 is a specification of the external output relay of the device, that is, whether the relay contact is opened or closed at the time of an abnormality, the rated capacity, the rated voltage, the manufacturing date, the lot number, and the micro. In addition to the specification data such as the version of the computer 4 and the unique number of the apparatus, the acceleration / deceleration time data and the thermal current value data are written as initial value data.

The interface section 7 is a buffer amplifier or the like.
With external device III₁Connector CN₂And connector
CN₁The cable 9 is detachably connected between
It is possible to control as shown in Figure 2.
Built in the internal bus of part II or microcomputer 4
Input port AD of two certain A / D converters₀, AD₁But
Connected and external device III₁… Is the connector CN₁Through
Once connected, the power supply of the control unit II will₁…What
Supply power supply voltage + Vcc, and external device III ₁From ...
Of sending the data and signals of the micro computer 4
In addition, the data from the macro computer 4 is transferred to the external device III.
₁It is designed to be sent to ...

External device III used in this embodiment
₁ ... As a copy for checking the contents by writing the initial value data to the EEPROM 5 of the control unit II, or transferring and copying the initial value data written to the EEPROM 5 of the control unit II at the time of maintenance or shipping inspection. There are an external device III ₁ forming a unit and external devices III ₂₁ and III ₂₂ forming an operating unit for giving a frequency command to the inverter device.

As shown in FIG. 3, the external device III ₁ is internally provided with a microcomputer 10, an EEPROM 11, a RAM 12 used for a work area and the like, and a display operation section 13, and an initial stage for writing to the EEPROM 5 of the control section II. The value data is created using the keyboard of the display / operation unit 13, the created data is once written in the EEPROM 11, and the written data is sent to the control unit II, and the initial data written in the EEROM 5 of the control unit II is written. It has a function of transferring the value data and copying it to the EEPROM 11.

External device III constituting the operation unit
Reference numeral ₂₁ is for creating a frequency command as a digital value and sending it to the control unit II. As shown in FIG.
A data creating circuit 2 for sending numerical data input by the keyboard 21 to the control unit II as digital data.
And 2. Further, the external device III ₂₂ constituting the operation unit is for creating a frequency command with an analog value and outputting it as analog data to the control unit II.
As shown in (b), a variable resistor VR is provided as frequency setting means, and the voltage signal divided by the variable resistor VR is output as analog data of the frequency command.

Here, each of the external devices III ₁ ... Has two A / Ds of the microcomputer 10 of the control unit II as identification signals.
Two voltage signals are output to the outside so as to correspond to the converter. For example, the external device III ₁ is 4.5V
(Or 2.5V) to AD ₀ and 4.0V to AD ₁ , and the external device III ₂₁ supplies 2.5V to AD 0.
_{At 0} , 3.0V is sent to AD ₁ , and the external device III ₂₂ is made to open 1.5V to AD ₀ and AD ₁ to open. The microcomputer 10 of the control unit II performs AD conversion of these voltage signals with an AD converter, reads the voltage value, identifies the connected external device III ₁ ... From the combination of the voltage values, and performs the corresponding operation. It has become. It should be noted that the determination of the voltage level has an allowable range to some extent. A built-in power source may be used as the voltage source V for identifying the external devices III ₁ ... Or may be supplied from the control unit II.

Thus, in the factory, the inverter main unit I and
Structurally as an inverter device in combination with Mie II
In the completed state, the inverter device
When setting the data, first of all, copy unit shown in Fig. 3 is used.
External devices that make up the unit III ₁To use. This external device I
II₁Connected to the control unit II through the interface unit 7
Then, the microcomputer 4 of the control unit II receives the voltage signal.
Identify the type by the number and determine that it is a copy unit
Then, the operation system corresponding to it is entered. External device II here
I₁Initial value by operating the keyboard of the display operation unit 13
A command to write data is sent, and the display operation continues.
The initial value data created by the keyboard of the work part 13 is sent.
When it is received, it is temporarily stored in RAM 6 and then EEPR
Write to OM5 and save. In other words, to save this writing
Therefore, after that, write this inverter device to EEPROM5.
Based on the specification data required for internal operation of the embedded initial value data
Based on this, the control operation is performed.

By the way, when the above-mentioned initial value data is created by using the external device III ₁ , it is created in a state where it is separated from the control unit II and the created data is written and stored in the EEROM 11 or from a separate computer or the like. After connecting to a configured data generator, the data created by the data creator is taken in, written and stored in the EEPROM 11, and then connected to the control unit II of the inverter device to perform the EEP.
It is also possible to send the data written in the ROM 11 to the control unit II.

[0024] or when performing maintenance of the inverter device using an external device III _1, or in the case of performing the inspection, by connecting an external device III ₁ to the control unit II via the interface unit 7, the data copy command Is sent to the control unit II by operating the keyboard of the display operation unit 13. That is, when this command is sent, the microcomputer 4 of the control unit II collectively reads the data written in the EEROM ₅ and transfers it to the external device III ₁ . The microcomputer 10 of the external device III ₁ temporarily stores the transferred data in the RAM 12 and then executes EEPRO.
Write to M11 and save. In other words, by this writing and saving, it is possible to check using a computer separately installed, or it is possible to check using the display unit of the display operation unit 13.

The operating unit used for giving the frequency command of the inverter device can directly give the frequency command by key operation according to the preference of the user, or can give the frequency command by rotating the variable resistor VR. The external device III ₂₁ is the former operation unit and the external device II ₂₂ is the latter operation unit. These external devices III ₂₁ , II
When I ₂₂ is connected to the control unit II, in the former case, the computer 4 takes in digital data through the internal bus and determines the set frequency. In the latter case, analog data is input to the input port AD ₂ of the built-in AD converter of the computer 4 through the interface unit 7 and the computer 4
Determines the set frequency from the AD-converted value.

[0026]

According to the invention of claim 1, EEPRO of the control unit.
Since the specification data can be sent to M from the outside through the interface unit to be written, after the control unit and the inverter main unit are assembled, it is possible to write the data according to the specifications to the EEPROM of the control unit before shipping, Therefore, it is not necessary to assemble the inverter device for each specification in advance, which has the effect of improving productivity.
Further, since the specification data written in the EERPOM can be sent to the outside through the read interface unit, the specification data of the inverter device can be easily confirmed at the time of maintenance or inspection, and the change can be made by the above writing operation. This has the effect of making it easier.

According to a second aspect of the present invention, in the first aspect of the present invention, the external device transfers the data written in the EEPROM of the control section through the interface section, and the transferred data is collectively stored and held. This external device is controlled because it consists of a copy unit with a memory unit that collectively stores and stores initial value data of specifications according to the specifications of the device that can be collectively transferred to the control unit through the interface unit and written in the memory of the control unit. Easy to connect to the interface section
You can easily write data to M, check data reading, etc., and use the memory part that holds and stores the data, so you can see the data read at the site at a remote place and create the data to write. Since the work can be performed at a place away from the site, there is an effect that the data confirmation work and the data creation work can be efficiently performed.

According to a third aspect of the present invention, in the first aspect of the invention, the initial value data written in the EEPROM of the control section and readable by the copy unit includes:
It includes the specifications of the relay used as an external contact, the rated voltage of the device, the rated capacity, the manufacturing date, the lot number, the version of the control means, the unique number of the device, and the acceleration / deceleration time. Easy,
Therefore, there is an effect that it is easy to take measures during maintenance.

According to a fourth aspect of the present invention, the external device is provided with means for generating an electric signal indicating a type by a signal level, and the control means of the control unit receives the electric signal of the external device taken in through the interface unit. A / D converted, then A /
Since it has a function to identify the connected external device from the D conversion value, simply connecting the external device to the interface section,
The control means of the control unit can automatically identify the connected external device, which eliminates the need for the user to perform a connection setting operation or the like each time the external device is connected, which facilitates handling. .

[Brief description of drawings]

FIG. 1 is an overall configuration diagram of an embodiment of the present invention.

FIG. 2 is a main part configuration diagram of a control unit of the above.

FIG. 3 is a configuration diagram of an external device III ₁ of the above.

FIG. 4A is a configuration diagram of an external device III ₂₁ of the above. (B) is a block diagram of the external device III ₂₂ of the above.

[Explanation of symbols]

I Inverter main part II Control part III ₁ External device 4 Microcomputer 5 EEPROM 6 RAM 7 Interface part

Claims (4)

[Claims] 1. An inverter main part comprising an inverter for switching direct current to convert it to alternating current power source and supplying the alternating current to an induction motor as a driving power source, a drive circuit for driving a switching element of the inverter, and this inverter. An EEPROM in which initial value data of specifications according to the specifications of the device is written in the main part, an interface part for connecting an external device, data written in the EEPROM and operation data sent from the outside through the interface part And a control means having a function of outputting a control signal to the drive circuit based on the above, a function of reading the data written in the EEPROM to the outside through the interface unit, and a function of writing the data sent through the interface unit into the EEPROM. With the control unit Inverter apparatus characterized in that it is configured. 2. The external device is an EEPROM of the control unit.
The data written in the interface is transferred through the interface, the transferred data is collectively stored and held, and the data is collectively transferred to the controller through the interface and written in the memory of the controller. 2. The inverter device according to claim 1, wherein the inverter device comprises a copy unit having a memory unit for collectively storing initial value data. 3. The initial value data written in the EEPROM of the control unit and readable by the copy unit includes relay specifications used as external contacts, rated voltage of the apparatus, rated capacity, manufacturing date, lot number, and control. 2. The inverter device according to claim 1, comprising a version of means, a device unique number, and acceleration / deceleration time. 4. The external device comprises means for generating an electric signal indicating the type of the signal level, and the control means of the control section A / D-converts the electric signal of the external apparatus taken in through an interface section, The inverter device according to claim 1, further comprising a function of identifying a connected external device based on the A / D conversion value.