KR19990032458A - Inverter Control - Google Patents

Abstract

The present invention relates to an inverter control device. In the related art, the connection method of the PLC and the inverter is weak to noise, and only one information can be transmitted as one signal, and thus a plurality of signal lines are required for transmitting a large amount of information. Transmission is difficult due to data distortion due to noise, it is difficult to transmit high-speed signals, and the connection method of the communication signal using PLC and the inverter can transmit and receive a large number of information through a single communication line. By using PLC), installation space is required, cost is increased, and since PLC and inverter are connected by serial communication, there is a limit in high speed data transmission, and inverter sequence automatic operation method by parameter setting Does not require a separate PLC, so it is very economical in terms of cost but only adjusts the values of certain parameters. Since the processing sequence, the complex and difficult to process various sequences, it requires a large number of parameters of the process, there is a problem that increase in the development time, such as a program and a program code size.

Accordingly, the present invention was devised to solve the above-mentioned conventional problems, and the PSC (PSC: Programmable Sequence Controller), which replaces the function of the conventional PLC (PLC), is separate from the part of processing the inverter function. Equipped with a processor and connected to two devices using dual port RAM to provide a device capable of high-speed data processing, cost savings without installing a separate expensive PLC for a variety of flexible sequence processing, It is effective to realize flexible sequence response, high-speed data transfer processing, and noise influence reduction.

Description

Inverter Control

The present invention relates to an inverter control device, and more particularly, to an inverter control device having a programmable sequence control function in an inverter device without using a separate programmable logic controller (PLC).

The economics and robustness of induction motors and the development of semiconductor technology are increasing the use of inverters, motor driving devices, and system applications that connect and use PLCs (PLCs) with inverters and various sensors are actively used.

In particular, there is an increasing number of small unit machines requiring the use of PLCs and PLCs that can freely sequence sequences. In this case, the use of analog signals or communication lines is used for connection.

Conventionally, in order for an inverter to perform a series of sequence operations, it is connected to a central controller such as PLC to receive and process a command from the PLC, and a plurality of parameters (operating frequency and constant speed time) inside the inverter. Depending on the setting of acceleration / deceleration time and input terminal status, there are methods to enable operation. Also, in case of using PLC, etc., there are two methods depending on the connection signal method. There is a connection method using 4-20mA, voltage signal) and a connection method using a communication line.

1 is a block diagram showing a connection method of a PLC and an inverter using a conventional analog signal, as shown in the connection method of the analog signal using PLC (PLC) 11 and the inverter 12 as shown in FIG. After connecting with analog signal such as 4 ~ 20mA current information or 0 ~ 10V voltage information, configure the inverter operation control by PLC program (PLC, 11).

A more advanced form is a method of connecting the communication signal using PLC 20 and the inverter 21 as shown in FIG. 2, and a plurality of inverters may be connected to the PLC. Status information can be transmitted and received using the communication signal (D). In this case, the PLC 21 has a communication control right and sends an operation command to the inverter 21, and the inverter 21 operates according to a write or read command.

3 is a graph showing the inverter sequence automatic operation according to the conventional parameter setting. As shown therein, the inverter internal parameters (frequency (E), constant speed (F), acceleration and deceleration) are not used. The sequence operation determined by the speed time (G) and the direction information) is performed.

In this case, a large number of parameters are required to perform a series of sequences.

As described above, in the related art, the connection method of the PLC and the inverter as shown in FIG. It is difficult to distort data due to noise, and it is difficult to transmit high-speed signals. Also, as shown in FIG. 2, the connection method of the PLC and the inverter can transmit and receive a plurality of information through one communication line. The use of PLC requires installation space, increases cost, and PLC and inverter are connected by serial communication, which limits the high-speed data transmission. Inverter sequence automatic operation method by parameter setting does not require separate PLC, so it is very economical in terms of cost. Since adjustment parameter values by processing the sequence, and complex and difficult to process various sequences, it requires a large number of parameters of the process, there is a problem that increase in the development time, such as a program and a program code size.

Accordingly, the present invention was devised to solve the above-mentioned conventional problems, and the PSC (PSC: Programmable Sequence Controller), which replaces the function of the conventional PLC (PLC), is separate from the part of processing the inverter function. Its purpose is to provide a device that is equipped with a processor and connects two devices using dual port RAM to enable high-speed data processing, which solves the problem of flexible sequence response, transmission processing speed, and cost reduction. .

1 is a block diagram showing a connection method of a PLC and an inverter using a conventional analog signal.

2 is a block diagram showing a connection method of a PLC and an inverter using a conventional communication signal.

3 is a graph showing the inverter sequence automatic operation by the conventional parameter setting.

Figure 4 is a block diagram showing the configuration of the inverter control device of the present invention.

5 is a block diagram showing a parameter connection process of the dual port RAM in FIG.

Fig. 6 is a block diagram showing a data connection relationship between a PS data area and a dual port RAM area of the present invention.

7 is a flowchart of PSC processing of the present invention.

FIG. 8 is a flowchart of a dual port RAM correspondence process of the inverter main body processor in FIG. 4; FIG.

* Description of the symbols for the main parts of the drawings *

11, 20: PLC 12, 21: Inverter

30, 31: I / O device 32: CS processor

33: Sequence Program Storage 34: Dual Port RAM (DPRAM)

35: inverter body processor 36: graphics loader

The structure of the inverter control apparatus of the present invention for achieving the above object comprises an input-output unit for performing terminal input or output processing; A programmable sequence controller (PSC) processor that performs a sequence process such as a PLC; A sequence program storage unit for storing a user sequence program; Dual Port RAM, which serves to store and transfer data between the PSC processor and the inverter main body processor; An inverter main body processor corresponding to the PSC while processing an inverter original function; It consists of a graphic loader for loading or modifying user sequence programs.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Fig. 4 is a block diagram showing the configuration of the inverter control device of the present invention, and the input / output devices 30 and 31 for terminal input or output processing as shown therein; A programmable sequence controller (PSC) processor 32 which performs a sequence process such as a PLC; A sequence program storage device 33 for storing a user sequence program; Dual Port RAM (DPRAM), which serves as data storage and transfer between the PSC processor 32 and the inverter body processor 35; An inverter main body processor 35 corresponding to the PSC 32 while processing an inverter original function; The graphics loader 36 is configured to load or modify a user sequence program.

Referring to the operation and effect of the embodiment of the present invention configured as described above are as follows.

FIG. 5 is a block diagram illustrating a parameter connection process of the dual port RAM in FIG. 4. As illustrated, the PS processor 32 and the inverter main processor 35 use the dual port RAM 34. In this figure, the user sequence program 6A is processed using the graphic loader 36. The user edits a desired sequence control program in a PC or the like to communicate with the PSC processor 32. An element (Flash ROM, EEPROM, etc.) written in the sequence program storage device 33 and which does not lose data even when the power supply is turned off is used.

FIG. 6 is a block diagram showing a data connection relationship between a PSC data area and a dual port RAM area of the present invention, and FIG. 7 is a flowchart of a PSC process of the present invention. (PSC) The processor 32 reads the contents of the data input through its input / output device 30 (input refresh), and reads the data of the read area 7B of the dual port RAM 34, PSC, 32) to the data area, to perform user sequence program processing (not directly involved in the data of the dual port RAM, but to refer to or change the data in the PSC 32 data area and to perform the sequence processing). After the processing is completed, the dual port RAM corresponding program 6B determines whether there is a change in the data corresponding to the dual port RAM, and if there is a change, the data is written to the write area 7A of the dual port RAM 34. If the flag 1 (7A) is activated to give information to be taken from the inverter main body processor 35, the PSC processor (PSC) 32 refreshes the output data to its input / output device 30, and then the first time. The data reading operation of the input / output device 30 is repeatedly repeated.

FIG. 8 is a flowchart illustrating a process for responding to a dual port RAM of the inverter main body processor in FIG. 4. As shown in FIG. 4, it is first determined whether flag 1 of the dual port RAM 7A is active. If the command data is read and reflected on the inverter main body, if it is not active, the dual port RAM data is not inputted and the state of the inverter main body (e.g. frequency, current, trip, etc.) is judged. If there is a change, data is recorded in the state area 7B of the dual port RAM 34, and the process returns to the beginning and repeats continuously.

The inverter main body processor 35 and the PSC processor (PSC) 32 are used separately, and do not use the dual port RAM 34 as a data transmission medium, use serial communication, general SRAM, or flip-flop. It is possible to operate with a similar protocol using (DF / F) and the like, and a program operation processing method for simultaneously processing the inverter main body function and the user sequence processing function using one processor is also possible.

As described above, the inverter control apparatus and method having a programmable sequence control function of the present invention can reduce costs, enable flexible sequence response, and enable high-speed data transfer processing without installing a separate expensive PLC for various and flexible sequence processing. There is an effect of realizing noise influence reduction and the like.

Claims (3)

An input / output unit for terminal input or output processing; A programmable sequence controller (PSC) processor that performs a sequence process such as a PLC; A sequence program storage unit for storing a user sequence program; Dual Port RAM, which serves to store and transfer data between the PSC processor and the inverter main body processor; An inverter main body processor corresponding to the PSC while processing an inverter original function; Inverter control device characterized by consisting of a graphic loader for loading or modifying a user sequence program. Programmable Logic Controller Inverter control device having a sequence processing function, comprising: using a sequence processor and an inverter function processing processor independently, and using dual port RAM as a data communication medium. Device. An inverter control device having a programmable logic controller (PLC) sequence processing function, comprising: a PS processor comprising a user sequence program and a dual port RAM corresponding program; Dual port RAM comprising control parameters and status parameters; An inverter control device comprising a communication structure comprising an inverter basic function program and an inverter processor consisting of a dual port RAM corresponding program.