JP3422888B2 - Inverter device - Google Patents

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to an inverter device for performing variable speed control of an electric motor.

[0002]

2. Description of the Related Art A conventional inverter device is capable of inputting an operation command, a command such as a frequency command value, etc., and a monitor output of data by transmission from the outside. Although setting is possible, the transmission of the inverter device transmits a start character, a command, and a data end character according to a predetermined procedure, and the procedure is 1
It was one fixed one.

[0003]

In the above-described inverter device, transmission can be performed only in a predetermined procedure, and in order to communicate with the inverter device, a device connected to the inverter device (for example, a personal computer or It is necessary to match the transmission procedure from the programmable controller) to the transmission procedure of the inverter device, and it has not been possible to connect to other inverter devices or other devices with different transmission procedures on the same transmission path.

For this reason, in order to transmit to another device having a different transmission procedure, a CPU built-in R in the inverter device is used.
It was necessary to replace the program in the OM or the external ROM with a program that communicates by a different transmission procedure, and it was necessary to replace the CPU or the external ROM. Moreover, the communication procedure could not be changed while the inverter device was in operation.

Further, the communication of the externally disclosed computer link and the communication of the optional peripheral device of the inverter device (for example, the peripheral device of the inverter device which communicates with a binary code such as a parameter batch writing and reading device) are the same for downsizing. When using the communication port of, perform the same communication procedure. For this reason, the communication text data must be disclosed to the outside. Therefore, it is necessary to use the JISX0201 symbol (JIS code or ASCII code) that is the standard specification in computer link communication, and communication can be performed at higher speed. The same binary code (raw data) as the memory data in the CPU could not be used.

[0006] Furthermore, while operating the inverter that communicates with an external computer such as a specific data monitor using a JIS (ASCII) code through only one communication port, the parameters are collectively read by the parameter batch write / reader or the like. When I wanted to, I could not change the communication procedure while driving.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a plurality of procedures or arbitrary steps in an inverter device for transmitting an input of a frequency command or an operation stop command and a monitor output of data through communication. There is provided an inverter device capable of performing communication according to the procedure described above, and capable of changing the communication procedure even while the inverter device is operating.

[0008]

In order to achieve the above object, in the present invention, a control circuit section for controlling an inverter circuit for driving an electric motor, a switch section of a panel for setting data of control conditions, and an external unit. In an inverter device equipped with communication means for inputting operation commands, frequency command values, etc. and monitoring data from the controller of
A means for selecting or setting a start character and a means for selecting or setting a text size or an end character are provided.
Further, there is provided a means for selecting whether to transmit the communication text data by a 7-bit or 8-bit symbol (JIS code or ASCII code) of JISX0201 or an 8-bit binary code (raw data).
Further, the setting of the communication procedure is provided with a setting means from the panel switch section, a setting means from communication and a means to switch by a signal from an input terminal.

The inverter device reads a preset start character, text size, end character and selection of JIS code (ASCII code) or binary code from a readable / writable non-volatile memory at the time of power source initialization,
It is the start character, text size, end character, and text data code of the communication text.

When the preset start character, text size, end character, and text data code are different from those of the connected device, the setting parameters of the communication are read by a command from the switch section of the panel or the communication, and the communication of the connected device is performed. Enter the start character, text size, end character, and text data code of. The CPU rewrites the setting value of the readable / writable nonvolatile memory with the input data. When the power of the inverter device is turned off and then turned on again, the selected start character, text size, end character and text code are read from a readable / writable non-volatile memory and the CPU built-in RO
Write in M and use as the start character, text size, end character and text data code of communication text. When a text is sent by communication from an external device, the inverter device receives an interrupt for each character and compares the received character with the start character. If it is different from the start character, wait for reception of the next character. When the character is the same as the start character, the reception of the communication text is started, and the characters until the end character is received or the number of text characters is received is defined as the communication text. Check the received character according to the set code.

It is possible to set a plurality of communication procedure settings. The communication A is set to JIS (ASCII code) and the communication B is set to a binary code, and the communication procedure is switched to one of the input terminals. JIS code (ASCII code) when the signal of the input terminal is off, binary code when on,
The communication code can be switched by inputting a signal, and the communication procedure such as the communication code can be changed even while the inverter device is operating.

Also, communication with a parameter batch writing / reading device for collectively reading / writing parameter data of the inverter device will be described. The parameter batch writing / reading machine first communicates the setting of switching to the binary code with the text data of JIS code (ASCII code) which is the standard setting, and when the inverter device receives the setting of the switching to the binary code, The text data is switched to the binary code from the next communication. Batch reading and writing of the parameter data of the inverter device is performed in binary code. When the batch reading and writing of parameters is completed, the inverter device automatically switches the text data from JIS code (ASCII code) to the next communication.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings. First, the overall configuration will be described with reference to FIG. The inverter circuit 1 has a power supply side terminal 2,
3 and 4 and load side terminals 5, 6 and 7, a three-phase AC power source 8 is connected to the power source side terminals 2, 3 and 4, and an electric motor, for example, three, is connected to the load side terminals 5, 6 and 7. The phase induction motor 9 is connected. Further, the inverter circuit 1 is a DC power supply circuit 1
It has 0. This DC power supply circuit 10 is a full-wave rectifier circuit 1 whose AC input terminals are connected to power supply side terminals 2, 3, and 4.
1 and a smoothing capacitor 12 connected between the DC output terminals of the full-wave rectifying circuit 11, and DC terminals 13 and 14 are connected to both terminals of the smoothing capacitor 12.

Further, between the DC buses 13 and 14, there is connected an inverter main circuit 21 in which transistors 15 to 20 which are six switching elements are three-phase bridge-connected, and each emitter of the transistors 15 to 17 has a load terminal 5. , 6,
Connected to 7. The six output terminals of the base drive circuit 22 are connected to the bases of the transistors 15 to 20 of the inverter main circuit 21, respectively. The inverter circuit 1 includes a control power supply circuit 23, the input terminal of which is connected to the DC buses 13 and 14,
A DC constant voltage control power supply is output between the output terminals. In this case, in the control power supply circuit 23, Vc
c indicates a control power supply voltage, and E indicates a ground potential.

The control circuit section 24 includes a microcomputer (hereinafter abbreviated as CPU) 25. This CPU2
5 has a built-in ROM 25a for storing a program for supporting the operation of the CPU 25, and a built-in RAM 25b as a memory, and a data bus / address bus connected to various memories such as a rewritable nonvolatile memory 26. There is. In the non-volatile memory 26, the communication character start character, end character, communication text data number, communication text data code type, whether or not communication procedure switching is assigned to an input terminal, and various controls are performed. Condition data is stored.

The output port of the CPU 25 is connected to the base drive circuit 22 and controls the switching of the transistors 15 to 20 which are switching elements to control the rotation of the induction motor 9. Control circuit unit 2
4 are all managed by the CPU 25, and have a built-in RAM 25
Control according to the data in b. The control condition data of the built-in RAM 25b is stored in the readable / writable nonvolatile memory 26 that stores the current setting data, and is transferred to the built-in RAM 25b at the time of initialization. Furthermore, CPU25
The serial port of the connector 3 via the transmission / reception circuit 27
9 is connected to an external device (not shown) such as a programmable controller or a computer or a parameter batch writing / reading device.

The control circuit section 24 further includes a power supply monitoring circuit 28.
Is equipped with. The power supply monitoring circuit 28 has an input terminal connected to the output terminal of the control power supply circuit 23 and an output terminal connected to the input port of the CPU 25, and the control power supply voltage Vcc from the control power supply circuit 23 reaches the set level. Until then, the CPU 25 is set in a reset (power-on reset) state.

The control circuit section 24 has a terminal block 29. In this terminal block 29, for example, 8 terminals of a plurality of terminals are connected to the input port of the CPU 25 via the buffer 30, and one or a plurality of terminals, for example, 2 terminals of analog input terminals are connected to the A / D converter 31. Through CPU2
5 input ports. Further, a plurality of terminals, for example, four terminals are connected to the output port of the CPU 25 via the buffer 32, and one or more terminals, for example, two terminals are connected to the analog output of the CPU 25 via the low pass filter circuit 33. At the same time, the plurality of terminals are connected to an external operating device (not shown).

The panel (setting operation section) 34 is provided with a key matrix circuit 35 for setting operation, and these input / output terminals are connected to the input / output ports of the CPU 25. In addition, the LED 36 for displaying data and operation status
Which are connected to the output port of the CPU 25 via the driver circuits 37 and 38.

The operation of the inverter device thus configured will be described with reference to FIGS. 1 to 3. First, the three-phase AC power supply AC of the device is turned on to supply the DC power supply Vcc from the control power supply circuit 23 to the control circuit section 24.
Starts its operation by a program stored in the built-in ROM 25a, and first clears the data in the built-in RAM 25b to initialize the data. After this initialization, the nonvolatile memory 26
The control condition data including the communication parameters stored in is read and written in the built-in RAM 25b. For the control condition data, various preset condition data, for example, the use of JIS code (ASCII code) for communication, the use of "(" for the start character, the use of "(" for the end character, etc. It is set.

The inverter device receives communication text data from an external controller such as a PLC according to a program according to a procedure. That is, when one character is received, the CPU2
5, the CPU 25 receives the received character and the built-in RA
Compare the start character "(" on M25b. If they do not match, discard the received character and wait for the next character. When the received character matches the start character "(", start receiving the text,
The text is received until the end character "(" is received or data corresponding to the number of text data is received.
25 decodes and processes the received text.

There will be described a case in which there are two types of external devices to be connected and the cables connected to the communication connector 39 are switched during operation to connect to two types of external devices having different communication procedures. FIG. 2 shows a flow chart of control contents, and FIG. 3 shows an example of two kinds of communication procedure A and communication procedure B. One external device is the start character "(", end character ")"
In the communication procedure of another device, the start character is "stx" and there is no end character.
The number of text data of binary code of character.

In the conventional inverter device, in order to communicate with two external devices, it is necessary to rewrite the communication procedure of the program stored in the built-in ROM 25a of the CPU 25, and the program with the rewritten communication procedure is stored in the built-in ROM 25.
It is necessary to replace the CPU 25 stored in a, it is not possible to switch the communication procedure during operation, and it is necessary to replace the CPU 25 after stopping the operation of the inverter device.

In the inverter device of the present invention, the communication setting parameters are read from the switch section of the panel and two types of communication procedures are set. Communication A inputs the start character "(", end character ")", JIS (ASCII) code, communication B inputs the start character "stx", text size 16 characters, and binary code for text data. Further, communication A / B switching is set to the input terminal 1. The CPU 25 rewrites the setting value of the readable / writable non-volatile memory 26 with the input data.

When the power of the inverter device is turned off and then turned on again, the nonvolatile memory 2 capable of reading and writing the selected start character, text size and selection of the text code.
6, and the communication data of communication A and communication B is written in the built-in RAM 25b as the start character, text size or end character of the communication text and the code of the text data. The CUP 25 monitors the signal at the input terminal 1, and communicates A when the input signal is off, and communicates B when the input signal is on.
Is the communication procedure.

When the text signal is sent from the external device by communication when the signal at the input terminal 1 is off, the inverter device receives an interrupt in character units and compares the received character with the start character "(" written in the internal RAM 25b. If it is different from the start character "(", it waits for the next character. When the same character as the start character "(", the reception of the communication text starts and the end character ")" is received. The received data is used as communication text, and the received character is checked according to the set JIS (ASCII) code.

When changing the connection of the connector to another connecting device during the operation of the inverter, the signal of the input terminal 1 is turned on. When the signal of the input terminal 1 is on and a text is sent by communication from an external device, the inverter device receives an interrupt in character units and compares the received character with the start character "stx" written in the internal RAM 25b. When it is different from the start character "stx", the reception of the next character is awaited. When the character is the same as the start character "stx", the reception of the communication text is started, and the reception data of the binary code for 16 characters is used as the communication text. The received character is checked according to the set binary code.

Communication with a parameter batch writing / reading device for collectively reading / writing parameter data of the inverter device will be described. The parameter batch writing / reading machine first communicates the setting for switching to binary code with the text data of JIS code (ASCII code), which is the standard setting, and when the inverter device receives the setting for switching, it starts the next communication. The text data is switched to binary code. Batch reading and writing of parameter data of the inverter device is performed in binary code. When the batch reading and writing of the parameters is completed, the inverter device automatically switches the text data from the next communication to the JIS code (ASCII code).

According to the present embodiment, a means for selecting or setting a start character, a means for selecting or setting a text size or an end character are provided, and further, communication text data is JISX02017 bit or 8-bit symbol (J
Since a means for selecting whether to transmit by IS code or ASCII code) or 8-bit binary symbol is provided, the communication can be performed by a plurality of means or arbitrary means.

Thus, by setting the transmission means of the inverter device to the same transmission means as the other inverter device or other equipment of different transmission means, the CPU in the inverter device is replaced and the program storage RO of the CPU is stored.
The connection can be made through the same transmission line without changing the hardware of the inverter device such as replacement of M. In addition, since it is equipped with a means to switch the setting of multiple communication procedures by the signal of the input terminal, it is possible to switch the communication means even when the inverter device is operating, and it is possible to communicate with external equipment with different communication procedures without stopping the operation. It is possible to switch.

Further, even when the parameter batch write / reader is connected to the same communication port as the computer link communication port for communicating with an external computer to communicate with the parameter batch write / reader, the computer link communication is performed. Since it is possible to communicate not by the JIS code (ASCII code) normally used in, but by the binary code which communicates raw data as it is, it is possible to shorten the time of batch reading and writing in the parameter batch writing and reading machine.

(Other Embodiments) As another embodiment, instead of storing communication parameters in a readable / writable non-volatile memory, a memory pack in which various settable non-volatile memory packs are stored is prepared. After rewriting the contents of the pack arbitrarily, by installing the memory pack,
There is an inverter device configured to perform communication in an arbitrary procedure.

[0033]

As described above, according to the present invention, the control circuit section for controlling the inverter circuit for driving the electric motor, the switch section of the panel for setting the data of the control condition, and the condition set by the switch section. Means for selecting or setting a start character in an inverter device having a display unit for displaying the data and the current operation status and a communication function for inputting operation commands, frequency command values, etc. from an external controller and monitoring the data , Has a means for selecting or setting the text size or the end character, and further transmits the data of the communication text by JISX0201 7-bit or 8-bit symbol (JIS code or ASCII code) or 8-bit binary symbol. Is equipped with a means for selecting the In is provided with the means for switching the setting of the communication means, performing the communication by a plurality of optional steps, it is possible to provide an inverter apparatus capable of changing the communication procedure even during operation.

[Brief description of drawings]

FIG. 1 is a circuit configuration diagram of an embodiment of the present invention,

FIG. 2 is a flow chart of control contents of one embodiment of the present invention,

FIG. 3 is a diagram showing a communication procedure A and a communication procedure B according to an embodiment of the present invention.

[Explanation of symbols]

1 ... Inverter circuit, 9 ... Electric motor, 21
... Inverter main circuit, 22 ... Base drive circuit, 23 ... Control power supply circuit, 24 ... Control circuit section, 25 ... Microcomputer (CPU), 26
... Read / write non-volatile memory, 27 ... Transceiver circuit, 28 ... Power supply monitoring circuit, 30 ... Buffer, 31 ... A / D exchanger, 32 ...
Buffer, 33 ... Low-pass filter circuit, 34 ... Panel (setting operation section), 35 ... Key matrix, 36 ... Display LED section, 3
7 ... driver, 38 ... driver.

Continuation of the front page (56) Reference JP-A-5-344744 (JP, A) JP-A-2-280689 (JP, A) JP-A-6-261596 (JP, A) JP-A-5-153784 (JP , A) JP-A-8-8779 (JP, A) JP-A-6-85878 (JP, A) JP-A-4-314570 (JP, A) JP-A-7-334496 (JP, A) JP-A-7-34496 (JP, A) 8-36487 (JP, A) JP-A-7-170293 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) H02M 7/48 G06F 13/00 G09G 5/22 H02P 7 / 63

Claims (6)

(57) [Claims] 1. An inverter device having a communication function between a control circuit section for controlling an inverter circuit for driving an electric motor, a switch section of a panel for setting data of control conditions, and an external controller, wherein the communication function is provided.
Is used to set the start and end characters of the communication text received from the external controller.
An inverter device comprising means for selecting from among the modes. 2. An inverter device having a communication function with a control circuit section for controlling an inverter circuit for driving an electric motor, a switch section of a panel for setting data of control conditions, and an external controller.
The start character of the communication text and the number of received text data received from the external controller are set by
An inverter device comprising a means for selecting from a plurality of codes . 3. An inverter device having a communication function with a control circuit section for controlling an inverter circuit for driving an electric motor, a switch section of a panel for setting data of control conditions, and an external controller.
A plurality of codes which are set to transmit the data of the communication text received from the external controller by the JISX0201 symbol or the binary symbol by the
An inverter device comprising means for selecting from among the above . 4. An inverter device having a communication function with a control circuit section for controlling an inverter circuit for driving an electric motor, a switch section of a panel for setting data of control conditions, and an external controller.
Communication text received from the external controller by
External controller with connected start and end characters
An inverter device, characterized in that it is provided with a means for setting according to the type . 5. The inverter device according to claim 1, further comprising means for switching setting of communication procedure by communication. 6. The apparatus according to claim 1, further comprising means for switching the setting of the communication procedure with a signal from an input terminal.
Inverter device described.