JPH03207295A - Inverter controller - Google Patents

Abstract

PURPOSE:To reduce in size a set actuator by providing operation relating switch means for applying an operation related command to a control circuit based on the control of a microcomputer and control condition data set switch means for applying control condition data. CONSTITUTION:An operation related key matrix circuit 35 including keys to be frequently used and a control condition data set key matrix circuit 36 including keys not so used except at initial time are distinctly provided at the left and right sides of a surface spring part of a case 32a. Accordingly, the operation or particularly the operation of the circuit 35 is facilitated to prevent an operating mistake. Further, since it is not necessary to use a set volume, an A/D converter, it can be reduced in size.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to an inverter control device that performs variable speed control of an electric motor.

(Prior Art) Conventionally, as a setting operation unit that provides a run command, stop command 1 frequency setting data, and various control condition data to a control circuit unit of an inverter circuit that drives an electric motor, a run command switch and a stop command switch are used.

A frequency setting volume and a plurality of control condition data setting volumes are provided and connected to the control circuit, or an operation command and a stop command.

A system is provided in which a large number of key switches for frequency setting and control condition data setting are collectively provided and connected to the control circuit section.

(Problem to be Solved by the Invention) In the former configuration using a conventional setting volume, in order to meet the demand for multifunctionality and high performance of the inverter circuit, the setting volume and the A/D converter can be combined with a number of functions. (For example, in the control of a three-phase induction motor, it is necessary to provide only 78 functions), and it is also necessary to use a high-precision A/D converter with high resolution and good temperature deviation, making the setting operation section large. However, there is also the problem that it becomes expensive.

In the latter configuration, which uses conventional key switches, there is a mixture of key switches that are usually frequently used for setting the run and stop frequencies, and key switches that are rarely used except for the initial stage, such as setting control condition data. Therefore, operation is troublesome and there is a high risk of erroneous operation.

The present invention has been made in view of the above-mentioned circumstances, and the object thereof is to make the setting operation section small and inexpensive, and to make the setting operation section easy to operate and to prevent erroneous operations as much as possible. Moreover, it is an object of the present invention to provide an inverter control device in which a setting operation section can be freely removed from a control circuit section.

[Structure of the Invention] (Means for Solving the Problems) An inverter control device of the present invention includes a control circuit unit that controls an inverter circuit based on operation-related commands and control condition data stored in a memory, and The circuit section is separable via a connector, and control power is supplied via the connector, and includes a microcomputer, operation-related switch means, control condition data setting switch means, and a power supply monitoring circuit. Under the control of the microcomputer, the operation-related commands and control condition data from the operation-related switch means and the control condition data setting switch means are stored in the memory of the control circuit section, and the A setting operation section is provided in which the microcomputer is reset by a power supply monitoring circuit, and the setting operation section is configured such that an operation-related switch means and a control condition data setting switch means are arranged separately. It has the following characteristics.

(Function) According to the inverter control device of the present invention, the setting operation section includes:
Based on the control of the microcomputer, operation-related switch means for giving operation-related commands to the control circuit section and control condition setting switch means for giving control condition data are provided, so that setting volume and the same number of A/D converters are provided. Compared to the case where a device is used, the setting operation section can be made smaller and cheaper. In addition, since the setting operation section is configured such that the operation-related switch means and the control condition data setting switch means are arranged separately, the operation of the setting operation section, especially the operation of frequently used operation-related switch means, is easy. This makes it easy to operate and prevents erroneous operations as much as possible. Moreover, the setting operation section can be freely removed from the control circuit section via the connector, but in this case, the inverter circuit is controlled based on commands and data stored in the memory of the control circuit section, so the electric motor In addition, since the microcomputer in the setting operation section is reset by the power supply monitoring circuit according to the voltage level of the control power supply, the microcomputer does not perform unnecessary operations, and therefore the setting operation is easy. The section can be shared for commands and data settings for the control circuit sections of other inverter circuits.

(Example) An example of the present invention will be described below with reference to the drawings.

First, the overall configuration will be described according to FIG.

The inverter circuit 1 includes power supply side terminals 2, 3, and 4 and load side terminals 5, 6, and 7. A three-phase AC power supply 8 is connected to the power supply side terminals 2, 3, and 4. 5.6
and 7 are connected to an electric motor, for example, a three-phase induction motor 9. Further, the inverter circuit 1 includes a DC power supply circuit 10. This DC power supply circuit 10 includes an aftereffect rectifier circuit 11 whose AC input terminal is connected to power supply side terminals 2.3 and 4;
A smoothing capacitor 12 is connected between the DC output terminals of this full-wave rectifier circuit 11, and DC buses 13 and 14 are connected to both terminals of the smoothing capacitor 12. Further, an inverter main circuit 21 is connected between the DC buses 13 and 14, and is formed by connecting six switching elements, transistors 15 to 20, in a three-phase bridge connection, and the emitters of each of the transistors 15 to 17 are connected to the load side terminals 5. 6 and 7. Six output terminals of a base drive circuit 22 are connected to the bases of each of the transistors 15 to 20 of the inverter main circuit 21, respectively. Note that the inverter circuit 1 includes a control power supply circuit 23,
Its input terminals are connected to DC buses 13 and 14, and a constant DC voltage control power source is output between the output terminals. In this case, in the control power supply circuit 23, Vcc indicates the control power supply voltage, and E indicates the ground potential.

The control circuit section 24 includes a microcomputer 25. This microcomputer 25 has a built-in RAM 25a serving as a memory, and an input/output port is connected to a memory such as a rewritable nonvolatile memory 26. This non-volatile memory 26 stores operation modes and control condition data for a large number of control items, for example 78 items. The microcomputer 25 has its multi-bit output port connected to the input terminal of the base drive circuit 22, and is configured to provide the base drive circuit 22 with commands and setting data stored in its built-in RAM 25a. . Further, the human power port and output port of the microcomputer 25 are connected to terminals of a connector 28 via a buffer 27 for shaping the transmission data waveform.

The control circuit section 24 further includes a power supply monitoring circuit 29.

This power supply monitoring circuit 29 has an input terminal connected to the control power supply circuit 23.
and the output terminal is connected to the input port of the microcomputer 25, and the microcomputer 25 is reset (power-on reset) until the control power supply voltage Vcc from the control power supply circuit 23 reaches the set level. It is supposed to be. The control circuit section 24 includes a terminal block 30. This terminal block 30
, a plurality of terminals are connected to an input port of the microcomputer 25 via a buffer 31, and the plurality of terminals are also connected to an external controller (not shown), which will be described later. It is configured as follows.

The setting operation section 32 is formed into a unit.

The setting operation section 32 includes a microcomputer 33 having a built-in RAM 33a serving as a memory. The input port and output port of the microcomputer 33 are connected to the terminals of the connector 28 corresponding to the buffer 27 via a transmission waveform shaping buffer 34, so that the buffer 27. Data is transmitted via connector 28 and buffer 34. Note that the setting operation section 32 is supplied with control power from the control power supply circuit 23 via the terminal of the connector 28.

As is well known, the connector 28 is removable and removable, so that the setting operation section 32 can be connected to the control circuit section 24.
can be electrically and mechanically separated from the Further, the setting operation section 32 includes an operation-related key matrix circuit 35 as an operation-related switch means and a control condition data setting key matrix circuit 36 as a control condition data setting switch means, and these persons and output terminals are connected to the microcomputer 33. who is connected to the output port.

The setting operation section 32 also includes a 4-digit segment-type display 371 for displaying various statuses and data, and an LED 38 for displaying frequency (Hz) units. 3 LEDs for percentage (%) unit display
9. It is provided with an LED 40 for displaying units of seconds (see) and an LED 41 for displaying panel operation, and these are connected to predetermined output ports of the microcomputer 33 via driver circuits 42 and 43. The setting operation section 32 includes a power supply monitoring circuit 44. This power supply monitoring circuit 44 has an input terminal connected to a terminal on the control power supply side of the connector 28, and an output terminal connected to the input port of the microcomputer 33. The microcomputer 33 is reset.

Now, the setting operation section 32 will be further explained with reference to FIG. The driving-related key matrix circuit 35 is “driving”
key 358. "r stop" key 35b.

"Δ (Frequency up setting)" key 34c, "(Frequency down setting)" key 35d and "Operation mode" key 35e
have. Further, the control condition data setting key matrix circuit 36 includes a "9/Select" key 36a and an "8-Enter" key 36b.

"7.Jump" key 36c, r6.multi-speed" key 36
d, r5-external F" key 36e, r4/overload" key 3
6f, r3/limit” key 36g.

"211 acceleration/deceleration" key 36h, rl-V/FJ key 36
i, ro・maximum F” key 36j, r・(decimal point)・read” key 36, r write” key 361° “setting display” key 36m, r second function” key 360, “clear” key 3
60 and a "shift" key 36p. and,
The setting operation section 32 is unitized with a case 32a, and includes a display 37. The LEDs 38 to 41 and the keys 35a to 35e are arranged on the left half of the front panel of the case 32a, and the keys 36a to 36p are arranged on the left half of the front panel of the case 32a.
The driving-related key matrix circuit 35 and the control condition data setting key matrix circuit 36 are located on the left side.

It is divided and placed on the right.

Next, the operation of this embodiment will be explained with reference to FIG. 3 as well.

When the three-phase induction motor 9 is controlled at variable speed by the inverter circuit 1, there are many control items, for example, as many as 78, and the nonvolatile memory 26 stores 78 control items as shown in FIG. Item is [No, OJ to rNo, 19
The control items are classified into 20 blocks up to J, and several types of control items related to each block are stored together with standard control condition data. Incidentally, FIG. 3 shows some representative examples of title display and control items.

First, when the three-phase AC power supply 8 is applied to the inverter circuit 1, the DC power supply circuit 10 outputs a DC power supply voltage, and in response, the control power supply circuit 23 outputs the control power supply voltage Vcc to power the inverter circuit 1 and the control circuit. 24. As a result, the microcomputer 25 of the control circuit section 24 starts operating, clears the stored contents of the built-in RAM 25a, and performs initialization. After this initialization, the microcomputer 25 reads out the control items and their control condition data stored in the nonvolatile memory 26 and writes them into the built-in RAM 25a. Further, the control power supply voltage Vc from the control power supply circuit 23
Since c is also supplied to the setting operation section 32 via the connector 28, the microcomputer 33 starts operating, clears the stored contents of the built-in RAM 33a, and performs initialization. After this initialization, the microcomputer 33 sends a data read command to the microcomputer 25 via the buffer 34, the connector 28, and the buffer 27, whereby the microcomputer 25 reads necessary data from the built-in RAM 25a or nonvolatile memory 26. buffer 27. It is sent to the microcomputer 33 via the connector 28 and buffer 34. Therefore, the microcomputer 33 writes the data sent in the above manner into the built-in RAM 33a.

Next, the driving operation and data setting operation by the setting operation section 32 will be described.

When the microcomputers 25 and 33 complete the initial setting, they are in a mode in which they can accept operation commands, stop commands, and frequency setting inputs. In this case, the operation command, stop command, and frequency setting of the inverter circuit 1 are input by operating the setting operation section 32 as well as by operating the terminal block 3 of the control circuit section 24.
0 or by an optional higher-level communication. When the microcomputer 25, 33 is initially set, it is set to one of the terminal block command mode, setting operation unit command mode, or optional upper-level communication command mode, according to the command mode selection data in the nonvolatile memory 26. Therefore, in order to enable the operation command, stop command, and frequency setting input from the setting operation section 32, it is necessary to put the setting operation section into the command mode. In this case, when the "driving mode" key 35e of the driving-related key matrix circuit 35 is pressed, the mode is switched and set each time the "driving mode" key 35e of the driving-related key matrix circuit 35 is pressed, and this is sequentially displayed on the display 37. When the setting operation unit command mode is set in this manner, the microcomputer 33 energizes the LED 41 for displaying panel operation to cause it to emit light. In this situation, press the "Run" key 3.
5a, the microcomputer 33 transfers the operation command to the buffer 34. The operating command is sent to the microcomputer 25 via the connector 28 and buffer 27, and the microcomputer 25 stores the operating command in the built-in RAM 25g. Then "stop"
When the key 35b is pressed, the microcomputer 33 sends a signal for clearing the operation command to the buffer 34. The command is now sent to the microcomputer 25 via the connector 28 and buffer 27, and in response, the microcomputer 25 clears the operating command stored in the built-in RAM 25a. Note that an external operation device (not shown) connected to the terminal block 30 is also provided with an operation-related key matrix circuit similar to the operation-related key matrix circuit 35 and a display device similar to the display device 37.

When setting the frequency prior to pressing the "Run" key 35a as described above, when the "Δ" key 35c is pressed, the frequency command value increases at a predetermined rate according to the operation time. Furthermore, when the "" key 356 is pressed, the frequency setting value is lowered at a predetermined rate according to the operation time, and this frequency setting value is displayed on the display 37. The frequency setting value data is sent to a buffer 34 by a microcomputer 33.
The signal is now sent to the microcomputer 25 via the connector 28 and buffer 27, and the microcomputer 25 rewrites the frequency command value data in the built-in RAM 25a.

Now, the setting operation of control condition data by the control condition data setting key matrix circuit 36 will be described. First of all,
By pressing the "setting display" key 36m, the microcomputer 33 is placed in the reception mode of the control condition data setting key matrix circuit 36. Thereafter, press the key corresponding to the block number (No.) to which the control item to be set belongs. For example, as shown in Figure 3,
If you want to set the control items of the "Standard Settings" in the blocks r No. and OJ belonging to "Function", press the "0/Maximum F" key 36j, and the microcomputer 33 will display [[ The title characters ``HiPJ'' are now displayed, indicating that the ``Standard Settings'' control item has been selected. If you want to set the next control item of "highest frequency", press the "shift" key 36p and the microcomputer 33 will shift the control item and display the title character rFt (J) on the display 37. This indicates that the "highest frequency" control item has been selected. From now on, each time the "shift" key 36p is pressed, the microcomputer 33 sequentially shifts the control items and displays the title characters on the display 37. Also, for example, the block rN belonging to the "second function"
If you want to set the "starting frequency" control item among the "starting frequency" among the The computer 33 displays rF-S on the display 37.
The title character "Hi" is displayed to indicate that the "starting frequency" control item has been selected. Control items of other blocks belonging to the first function and control items of blocks belonging to the second function can also be selected by similar operations. After selecting the control item you want to set in this way,
When the "...read" key 36k is depressed, the microcomputer 33 sends a signal to read the control condition data of the selected control item to the buffer 34. The data is sent to the microcomputer 25 via the connector 28 and buffer 27. In response, the microcomputer 25 reads control condition data for the control item corresponding to the read signal from the built-in RAM 25a, and reads the control condition data from the buffer 27. The control condition data is sent to the microcomputer 33 via the connector 28 and buffer 34, and the microcomputer 33 stores the sent control condition data in its built-in RAM 33B and displays it on the display 37. When changing the control condition data, the changed data can be changed by selectively pressing keys 36a to 36j with numerical values r9J to "0" and key 36k with a decimal point "life". Enter. This changed data is sequentially stored in the built-in RAM 33g by the microcomputer 33 and displayed on the display 37. After changing the control condition data in this way, when the "write" key 361 is pressed, the microcomputer 33 writes the data into the built-in RAM 3.
It is checked whether the control condition data changed and stored in 3a is within the data setting range of the control item in question, and when it is determined that it is not (outside the range), a setting error is displayed on the display 37. When the microcomputer 33 determines that the changed control condition data is within the set range, the microcomputer 33 sends the rewrite signal and control condition data to the microcomputer 25 via the buffer 34° connector 28 and the buffer 27. microcomputer 2
Step 5 rewrites the data of the corresponding control item in the built-in RAM 25a. Similarly, the microcomputer 33 also sends a rewrite signal and control condition data to the nonvolatile memory 26, and rewrites the data of the corresponding control item in the nonvolatile memory 26.

In the above case, after selecting the control item to be set, the control condition data of the control item is changed by selectively pressing the keys 36a to 36k. and "" key 35d
It can also be done by. That is, when the "△" key 35c or the "" key 35e is pressed, the microcomputer 33 reads data at a predetermined rate from the control condition data stored in the built-in RAM 33g within the data setting range of the control item. is raised or lowered, and this is displayed on the display 37, and the rewrite signal and the control condition data changed to raise or lower are sent to the buffer 34. The data is sequentially sent to the microcomputer 25 via the connector 28 and the buffer 27, and therefore the microcomputer 25 uses the built-in R
The control condition data sent to A M 25 a is sequentially written and stored in the corresponding control items.

Next, the operation of the control circuit section 24 will be described.

The microcomputer 25 checks the input from the terminal block 30 at predetermined intervals and stores the commands in the built-in R.
AM25H, and also communicates with the microcomputer 35 at a predetermined period to store data in the built-in RAM 25H.
Read for g.

Write. Similarly, the microcomputer 25 checks the operation command in the built-in RAM 25a at a predetermined period, and if the operation command is stored, the microcomputer 25 updates the frequency command value data and the control condition data of each control item in the built-in RAM 25a. Based on this, the inverter circuit 1 is controlled, thereby controlling the frequency and voltage of the three-phase induction motor 9.

In this state, even if the connector 28 is pulled out and the setting operation section 32 is electrically and mechanically separated from the control circuit section 24, the microcomputer 25 will not be able to access the built-in RAM.
Control of the inverter circuit 1 is continued based on the data of 25a. After that, when the connector 28 is connected again, the control power supply voltage VCC is supplied to the power supply monitoring circuit 44 via the connector 28, and the power supply monitoring circuit 44 is configured to give a reset signal to the microcomputer 33 for a certain period of time. Therefore, the microcomputer 33 will be reset. When the reset by the power supply monitoring circuit 44 is released, the microcomputer 33 operates in the same manner as described above to clear the built-in RAM 33a, and then reads necessary data from the built-in RAM 25a or the nonvolatile memory 26 and stores it in the built-in RAM 33a. This causes the connector 28 to return to the state before it was disconnected.

In addition, in the operating state of the three-phase induction motor 9 as described above, when the "stop" key 35b of the operation-related key matrix circuit 35 in the setting operation section 32 is pressed, the microcomputer 25 Built-in RA
The operation commands stored in M25a are now cleared, and the microcomputer 25 clears the internal RAM2.
When checking the operation command 5a, it is determined that there is no operation command, and the control of the inverter circuit 1 is stopped, thereby stopping the operation of the three-phase induction motor 9.

Further, in the operating state of the three-phase induction motor 9 as described above, if the connector 28 is disconnected, a signal to clear the operating command is generated by pressing the stop key from the external operating device. If it is output, the clear signal will be given to the microcomputer 25 via the terminal block 30 and buffer 31, and the microcomputer 25 will clear the operating command in the built-in RAM 25H. This causes the microcomputer 25 to stop controlling the inverter circuit 1.
As a result, the operation of the three-phase induction motor 9 is stopped. after that,
When an operation command is output by pressing the operation key from an external operation device, the operation command is given to the microcomputer 25 via the terminal block 3o and the buffer 31, and is stored in the built-in RAM 25.
The operation command is stored in a, and the three-phase induction motor 9
operation will begin.

According to this embodiment, the following effects can be obtained. That is, in the setting operation section 32, a driving-related key matrix circuit 35 including frequently used keys 35a to 35e and a control condition data setting key matrix circuit 36 including keys 36a to 36p which are not used much except at the initial stage are provided. Left side of the front panel part of the case 32a.

Since they are arranged separately on the right side, their operation, especially one operation of the operation-related key matrix circuit 35, is facilitated, and operational errors can be prevented as much as possible. Since there is no need to use a converter, the device can be made compact and inexpensive. Further, since the setting operation section 32 is separably connected to the control circuit section 24 through the connector 28, the setting operation section 32 can be freely electrically and mechanically separated from the control circuit section 24. In this case, the changed control condition data from the setting operation unit 32 is stored in the built-in RAM 25a of the microcomputer 25 in the control circuit unit 24,
Since the inverter circuit 1 is controlled based on the data in the built-in RAM 25a, there is no problem in the operation of the three-phase induction motor 9.

Further, in this case, the setting operation unit 32 includes a microcomputer 33 and a power supply monitoring circuit 44, and when electrically connected to the control circuit unit 24 via the connector 28, the setting operation unit 32 uses the power supply monitoring circuit 44 to control the microcomputer 3.
3 is reliably reset, the microcomputer 33 does not perform any unnecessary operations, and therefore the setting operation section 32 can be used to issue commands to the control circuit sections of other inverter circuits.

It can be used for data setting, and is extremely inexpensive compared to the case where a setting operation section is provided for each control circuit section. Furthermore,
The nonvolatile memory 26 stores a large number of control items (for example, 78
Control items) are classified into 20 blocks, and the related control items are stored in each block along with their standard control condition data, and keys 36a to 36j are used to select the block number of the control item to be set. (
Since selection is made using the key 36n) and the key 369 as necessary, the control item can be easily selected and the control condition data can be easily changed. Moreover, after changing the control condition data using the setting operation section 32,
Since the changed control condition data is rewritten and stored in the built-in RAM 25a of the microcomputer 25 in the control circuit section 24, the burden on the microcomputer 25 in the control circuit section 24 is reduced, and therefore, during the operation of the three-phase induction motor 9, The control condition data can be easily changed even if the
5c or "" key 35d is suppressed, the control condition data in the built-in RAM 25a of the microcomputer 25 in the control circuit section 24 is raised or lowered by a predetermined percentage of data within the data setting range. As a result, the control condition data can be changed while observing the operating status of the three-phase induction motor 9.
Extremely convenient.

In the above embodiment, the operation-related key matrix circuit 35 and the control condition data setting key matrix circuit 36 are arranged in the left and right sections in the setting operation section 32, but they may be arranged in the upper and lower sections, for example. It may also be arranged in such a way that the

In addition, the present invention is not limited only to the embodiments described above and shown in the drawings, but can be applied not only to three-phase induction motors but also to motors in general driven by inverter circuits, within the scope of the invention. Of course, it can be implemented with appropriate modifications.

[Effects of the Invention] As explained above, in the inverter control device of the present invention, the operation-related switch means and the control condition data setting switch means are arranged separately in the setting operation section, and the setting operation section is arranged in the control circuit section. In addition, the microcomputer in the setting operation section can be reset according to the voltage level of the control power supply, so the setting operation section can be made smaller and cheaper. , the setting operation section is easy to operate and erroneous operation can be prevented as much as possible, and the setting operation section can be freely removed from the control circuit section, making it possible to share it with other control circuit sections. It has the following effects.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention; FIG. 1 is an explanatory diagram of the electrical configuration, FIG. 2 is a top view of the setting operation section, and FIG. FIG. In the drawing, 1 is an inverter circuit, 9 is a three-phase induction motor (motor), 21 is an inverter main circuit, 23 is a control power supply circuit, 24 is a control circuit section, 25 is a microcomputer, 2
5a is built-in RAM (memory) 26 is non-volatile memory (
28 is a connector, 30 is a terminal block, 32 is a setting operation unit, 33 is a microcomputer, 33a is a built-in memory, 35 is an operation-related key matrix circuit (operation-related switch means), 36 is a control condition data setting key matrix Circuit (control condition data setting switch, sochi means), 3
7 indicates a display device.

Claims (1)

[Claims] 1. An inverter circuit that drives an electric motor, a control circuit section that controls the inverter circuit based on operation-related commands and control condition data stored in a memory, and a control circuit section that is separable via a connector. It is also provided with a control power supply through the connector, and has a microcomputer, operation-related switch means, control condition data setting switch means, and a power supply monitoring circuit, and operates under the control of the microcomputer. Operation-related commands and control condition data from the control condition data setting switch means are stored in the memory of the control circuit section, and the microcomputer is reset by the power source monitoring circuit in accordance with the voltage level of the control power source. 1. An inverter control device comprising: a setting operation section, the setting operation section being configured such that an operation-related switch means and a control condition data setting switch means are arranged separately.