JPS6380778A - Inverter - Google Patents

Abstract

PURPOSE:To easily input externally to an inverter by providing a digital switch for setting control information on a switch circuit substrate, and detachably providing it on the substrate. CONSTITUTION:An inverter is composed of a diode converter, a smoothing capacitor, an inverter main circuit, and a controller for controlling an output frequency. The controller is composed of a microcomputer and has setters 1-3 for setting various types of control information. It is provided on a switch circuit substrate 12 separate from the body circuit substrate 11 of the controller, and detachably provided through a connector 13 on the substrate 11. Thus, when control information is set by a manual operation, while the substrate 12 remains attached to the connector 13, its digital switches 1-3 are operated. When control information is set by the external controller, it is connected through an interface circuit substrate 14 instead of the substrate 12.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to an inverter device in which various control information can be set as desired by digital switches.

(Prior art) In general, a control circuit for controlling the output frequency, output voltage, etc. of an inverter device is designed such that even if the set value of the output frequency changes suddenly, the actual output frequency changes to a degree that the motor can follow. It has a ramp function generator that increases and decreases the rate, and also changes the so-called ■/F ratio according to a predetermined pattern. In general-purpose inverter devices in particular, in order to perform appropriate control according to the load characteristics, the slope of the ramp function is varied as shown in Figure 5, or as shown in Figure 6. Various V/F patterns can be selected.

Now, Figure 7 shows that by changing the slope of the ramp function,
An example of a control information setting circuit for setting various control information for selecting a pattern is shown. Here, 1 is an acceleration time setting device for changing the slope of the ramp function during acceleration, 2 is a deceleration time setting device for changing the slope of the ramp function during deceleration, and 3 is V/F
This is a V/F pattern setting device for selecting a pattern. Each of the setting devices 1 to 3 described above is composed of a 4-bit digital switch. One fixed contact group of each setter 1 to 3 is connected to output ports ACC, DEC, V/
The other fixed contact group of each setter 1 to 3 is connected to the data ports A, B, C, and D of the microcomputer through four groups of diodes having the polarities shown in the figure. Note that 4a always has the data input port set to "0".
This is a pull-down resistor for dropping the voltage.

Here, for example, acceleration time information is stored in a microcomputer.
When reading into the microcomputer, only the output port ACC of the microcomputer is "1" and the DEC.

V/F becomes "0". Therefore, in this case, input port A,
4-bit information is given to B, C, and D. In addition, to read deceleration time information and V/F pattern information, the information is read into data manual ports A, B, C, and D by setting output port DEC or V/F to "1", respectively. . As shown in FIG. 8, each of the setting devices 1 to 3 is provided on the same control circuit board 5 as the main body of the control circuit, and can be manually operated from outside the apparatus.

(Problem to be Solved by the Invention) However, in the above configuration, each control information can only be set manually for each unit, and for example, the control information can be set by control signals from an external control device such as a programmable controller. The drawback was that it was not possible. In order to eliminate this drawback, it may be possible to equip the control circuit with a communication function for setting data in advance, but this would make the control circuit extremely complicated and expensive, and it would also be difficult to provide a communication function for sending and receiving control information. The reality is that it has not been put into practical use due to factors such as the complexity of microcomputer programs.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide an inverter device that has a simple configuration and can input control information from an external control device.

[Structure of the Invention] (Means for Solving the Problems) The inverter device of the present invention includes a digital switch for setting control information that is separate from the main circuit board on which the main body of the control circuit is mounted. In addition to providing it on the circuit board,
This switch circuit board is configured to be removable from the main body of the control circuit via a connector, and the switch circuit board and an interface circuit board that receives control information from an external control device can be selectively connected to this connector. It is characterized by its structure.

(Function) To set the control information by manual operation, the digital switch provided on the switch circuit board may be operated while the switch circuit board is attached to the connector. Also,
To set control information using an external control device such as a programmable controller, the external control device may be connected via an interface circuit board attached to the connector instead of the switch circuit board.

(Embodiment) An embodiment of the present invention will be described below with reference to FIGS. 1 to 4. Note that the same parts as in the conventional example are given the same reference numerals and detailed explanations will be omitted.

First, FIG. 4 shows the basic configuration of the inverter device according to the present embodiment. In the figure, 6 is a diode converter, 7 is a smoothing capacitor, 8 is an inverter main circuit, and 9 is each switching element of the inverter main circuit. This is a control circuit that controls output frequency, output voltage, etc. by controlling on/off, and a frequency setter 10 is connected to this control circuit 9 . Now, the control circuit 9 has a well-known configuration including a microcomputer (not shown), and determines the output frequency based on the signal from the manually operated frequency setter 10. The output frequency increases or decreases according to a ramp function with a predetermined slope, and the output voltage changes according to a predetermined V/F pattern in accordance with the output frequency.

The slope of the ramp function and the V/F pattern can be varied in various ways, and the configuration of the control information setting circuit for setting various control information is as shown in FIG. It is configured as shown in . However, here, the acceleration time, deceleration time, and V/F pattern setters 1 to 3 for setting various control information, the diode 4, and the pull-down resistor 4a are connected to the control circuit as shown in FIG. 1(A). The switch circuit board 12 is provided on a switch circuit board 12 that is separate from the main circuit board 11 on which the main body part is mounted, and can be attached to and detached from the main circuit board 11 via a connector 13. And the terminal AO+ of the connector 13
BO, c, , DO to data lines A, B, in Fig. 7.
C and D are connected, and the terminals A CCo and D E C
o, control line A CC to V/F o
, DEC, V/F, and can be connected to the individual output ports of the Motte microcomputer.

On the other hand, FIG. 1(B) shows a state in which the switch circuit board 12 has been removed from the connector 13 of the main body circuit board 11, and an interface circuit board 14 has been attached in its place. The interface circuit board 14 is provided with an external connection connector 15 to which an external control device such as a programmable controller is connected, in addition to a connector 13 for connection to the main body circuit section.
An interface circuit as shown in FIG. 2 is implemented. In FIG. 2, 16 to 18 are 4-bit latch circuits, and 19 to 21 are 4-bit 3-state buffers. The input sides of each of the latch circuits 16 to 18 are terminals AI, B1. c1.
Commonly connected to DI, and each clock terminal CK
are terminals ACC, DEC1 of external connection connector 15
.

V/F, respectively. The output terminals of each of the latch circuits 16 to 18 are connected to the input terminals of the 3-state buffers 19 to 21 that form a pair therewith, and the output terminals of the 3-state buffers 19 to 21 are connected to the interface circuit board 14. They are commonly connected to the data terminals An+BO+CO+DO of the provided connectors 13. In addition, this interface circuit board 14
Terminals ACCo, DECO, V of connector 13 provided in
The gate terminals G of each of the three-state buffers 19 to 21 are connected to /FO.

Now, in order to manually set the control information such as the acceleration time in the above construction, the switch circuit board 12 is attached to the main body circuit board 11 via the connector 13. As a result, each data line A, B, C of the control information setting circuit
, D and control lines ACC, DEC, and V/F are connected to each output port of the microcomputer as in the conventional case. Therefore, each setting device 1 to 3
Desired control information can be set by appropriately setting .

On the other hand, when setting control information using an external control device such as a programmable controller, an interface circuit board 14 is installed in place of the switch circuit board 12.
Connect the programmable controller to the external connection connector 15. In this state, connect terminals A1 and B of external connection connector 15 from the programmable controller.
l + c, +DI, ACCl, DECl, V/
When data and write pulses are applied to F1 as shown in FIGS. 3A and 3B, each data is latched into each latch circuit 16 to 18 in the following manner. That is, terminal A
When a "1" signal is given to CC1, the clock terminal CK of the latch circuit 16 becomes "1", so that the terminals Al and B
The data applied to l, cll Dl is held in the latch circuit 16 as acceleration time information. Similarly, when "1" is given to the terminal DEC, and the terminal ■/F
When "1" is given to "1", each data is sent to the latch circuit 17.1 as deceleration time information and V/F pattern information, respectively.
It is held at 18. After that, as shown in Fig. 3(C), the connector 1 is connected from the microcomputer of the control circuit.
When a read pulse is applied to the terminals ACC, DEC, and V/F of the 3-state buffer 19, the gate terminal of the 3-state buffer 19 becomes ``1'' when the terminal ACC becomes ``1'', so the data in the latch circuit 16 is Terminals AO, Bo, Co, Do
Similarly, when the terminals DECo and V/Fo become "1", deceleration time information and V/F pattern information are respectively given to the microcomputer through the terminals DECo and V/Fo. That is, even when the interface circuit board 14 is installed in this way and various data are given from the programmable controller,
The data can be given to the microcomputer in the same way as when the switch circuit board 11 is installed in the device aL.

In the above embodiment, the case where acceleration time, deceleration time, and V/F pattern are set as control information has been described, but the present invention is not limited to this, and may be applied to cases where other control information is set. Can be done. Furthermore, the data bus is not necessarily composed of 4 bits, but can of course be selected as appropriate. In addition, the present invention is not limited to the embodiments described above and shown in the drawings; for example, the specific configuration of the control information setting circuit is not limited to that shown in the drawings, and various modifications may be made as long as the configuration performs the same function. It can be implemented by

[Effects of the Invention] As described above, the present invention provides a digital switch for setting control information on a switch circuit board so that it can be removed from the main body circuit board, and a digital switch that can be replaced with the switch circuit board. Since the interface circuit board that receives control information from the external control device can be mounted on the device, an excellent effect is achieved in that control information can be input from the external control device with a simple configuration.

[Brief explanation of the drawing]

1 to 4 show an embodiment of the present invention, and FIGS.
The figure is a circuit diagram of the interface circuit, Figure 3 is a signal waveform diagram, Figure 4 is a block diagram showing the overall principle configuration, and Figure 5 is a diagram of the interface circuit.
The figure shows a characteristic diagram of output frequency to show various ramp functions, Figure 6 shows a characteristic diagram of output voltage to show V/F pattern, Figure 7 shows a circuit diagram of a control information setting circuit, and Figure 8 shows a characteristic diagram of output voltage to show various ramp functions. FIG. 1 is a perspective view showing a conventional control circuit board. In the drawing, 1 is an acceleration time setting device (digital switch), 2
is a deceleration time setting device (digital switch), 3 is a V/F pattern setting device (digital switch), 9 is a control circuit, 1
0 is a frequency setter, 11 is a main body circuit board, 13 is a connector, 14 is an interface circuit board, 16 to 18 are latch circuits, and 19 to 21 are three-state buffers. Applicant: Toshiba Corporation Figure 1 Figure 3 Figure 4 Figure 5 Output side 5F9. Number → Figure 6

Claims (1)

[Claims] 1. In a control circuit for controlling the output frequency, output voltage, etc., in which control information is set using a digital switch, the digital switch is different from the main circuit board on which the main body of the control circuit is mounted. The switch circuit board is provided on another switch circuit board, and the switch circuit board is configured to be detachable from the main body of the control circuit via a connector, and an interface circuit that receives control information from the switch circuit board and an external control device is connected to the connector. An inverter device characterized by being able to be selectively connected to a circuit board.