KR200178021Y1 - Digital motor control unit and remote motor control system - Google Patents

Abstract

The present invention relates to a digital motor remote control system. In the past, an analog motor controller was used, which requires wiring of all signal lines for remote control, and an expensive PLC for remote control by communication. Accordingly, the present invention controls the actual motor, monitors the operation state, transmits to the data relay when the state changes, and digitally controls the motor and detects the current voltage of the motor digitally, and one-to-one with the digital motor controller. Remote switch box for controlling motor and displaying operation status by communicating with digital motor controller at site where motor is installed and multi-communication with up to 64 motor controllers, collecting data and transmitting to remote control panel And a data relay device for transmitting a control command of the remote control panel to the motor control device; The operating program is mounted on the PC to display the information collected from the data relay device, and transmits the operator's control command to the data relay device. Accordingly, the present invention can provide a digital motor remote control system that simplifies complex wiring, reduces the footprint, and manages accurate self-diagnosis and protection functions and information on operation status in a database.

Description

Digital motor remote control system using digital motor control device and communication network {Digital Motor Control Unit and Remote Motor Control System}

The present invention relates to the remote control of the motor, and in particular, the center control unit using multi-communication performs a combination of individual control and monitoring functions of a plurality of motors by an operating program and control by one-to-one communication in the field and a built-in protection function. The present invention relates to a digital motor remote control system to prevent the motor from being burned out.

1 is a configuration diagram of a conventional analog control type motor control apparatus (MCC), and as shown in FIG. 1, a power input unit 91 for receiving a three-phase AC power and a power supply of the power input unit 1 are shown. A circuit breaker (2) for manually breaking circuits and short circuits, a magnet relay unit (3) for driving the motor (4) by controlling the supply / disconnection of power through the circuit breaker (2), and detection The electronic overcurrent switch 5 and the magnetic overcurrent switch 5 and the magnetic relay unit 3 are controlled by a user's operation to control the power supply and cutoff to the magnet-specific relay unit 3 according to the supplied current. The operation unit 6 for operating the motor, the state display unit 7 for displaying a state controlled by the operation unit 6 through a pilot lamp, and detecting the current supplied to the motor 4. Displays the current of the current detector 8 It is configured to include a current display section 9.

The motor controller configured as described above is a general three-phase motor controller configured in an analog manner to control the operation of the motor by operating the operation unit 6 in the field, and is configured to automatically shut off the motor drive by the overcurrent detection.

FIG. 2 is a schematic diagram of a remote control apparatus of a conventional motor, and further includes a controller / remote control selector 11 for selecting on-site control or remote control in a basic motor control apparatus 10 on a site as shown in FIG. In addition, the basic motor control apparatus 10 and the controller / remote control selection unit 11 are connected to each other in a one-to-one wiring, and a remote control unit 20 is configured to control and display and control at a remote location. The operation unit 21 and the display unit 22 are configured, and the operation unit and the display unit of the basic motor control device 10 in the field, each operation signal and the display signal lines are connected one-to-one, and also connected to the controller / remote control selector 11. It is configured to remotely control from the remote control unit 20.

However, such a conventional remote control device, because the on-site control device and each control line must be connected one-to-one, large-capacity and remote control is difficult and only simple control at a short distance is possible.

3 is a schematic diagram of a remote control apparatus for a motor using a conventional communication network. As shown in FIG. 3, a controller / remote control selector 11 for selecting a site control or a remote control is selected for a basic motor control apparatus 10 in a field. And converting the signal lines of the control unit 6, the display unit 7, and the controller / remote control selector 11 of the motor control apparatus 10 into digital data to transfer and transmit control commands. And the signals of the motor control apparatus 10 and the selection unit 11 received through the PLC 12 to the remote site, and the remote control command via the PLC 12 to the motor control device 10. And a PC 13 which is transmitted to the selection unit 11 to interface the remote control by communication.

In the remote control device of the motor by the communication configured as described above, each motor control device 10 should be provided with a PLC 12 which is a means for connecting the corresponding signal lines and interfacing with the PC side. In order to control remotely through the PC 13, information collection processing means for connecting through a large number of signal wirings with a plurality of PLCs 12 and interfacing to the PC side is required.

The conventional analog motor control apparatus includes a relay of the magnetic relay unit 3 and a pilot lamp of the display unit 7, a display module of the current display unit 9, a CT sensor of the current detection unit 8, and an electronic overcurrent switch. Such components have to rely on the wiring with the remote device, which makes the hardware bulky, difficult to construct and manufacture, and cannot use existing sequences when adding functions.

In addition, when an alarm occurs due to an abnormal motor operation, it is simply displayed as a trip, and it is difficult to identify the detailed cause of the abnormality (overcurrent amount, phase loss). Since the display is not easy for the operator to read the current value accurately, there is no function to monitor and record the operating data such as the operating current, starting current, starting time, etc.The remote control unit and display unit must be shared at the remote place. Construction costs and setting labor costs increase.

Therefore, the present invention considers the problems caused by the remote control of the analog motor controller as described above to simplify the complicated wiring, reduce the occupied area, and to manage the information on the accurate self-diagnosis function, the protection function and the operation status in the database. To provide a digital motor remote control system using a digital motor control device and communication network.

A digital motor controller includes: a motor controller for driving a motor by supplying / blocking a three-phase power supply through a magnet contactor, the digital motor controller comprising: digital measuring means for measuring current and voltage of each phase and converting it into a digital signal; Central control means for setting a set value for a driving condition of the motor and monitoring the current and voltage of each phase measured by the digital measuring unit during operation to stop the motor if the driving condition is not met; Photo isolation means for controlling the driving of the motor by driving the relays of the magnet contactor by the control of the control means; Operation setting means for operating operation and setting operation conditions for operation control of the central control means, and storing means for storing the setting values; Display means for displaying the measured current, voltage and operating state and condition; Characterized in that it comprises a serial communication means for communicating with the alarm means and remote control devices.

In addition, a remote switch box communication means is installed in the digital motor control device, and the remote switch box communication means includes a remote switch box connected to a wired line for setting operation conditions, operation operation and status display. Configure the control system.

In addition, the data relay device connected in series communication with the digital motor controller, multi-communication with up to 64 motor controllers, collects data, transmits the data to the remote control panel, and transmits control commands from the remote control panel to the motor controller; The operation program is installed on the PC to display the information collected from the data relay device, to transmit the operator's control command to the data relay device, and to configure the digital motor remote control system including a remote control panel for databaseing the information on motor operation. Has a feature.

The digital motor controller according to the present invention controls the motor by digital control, measures and monitors the current and voltage of each phase, and controls the motor drive based on the result, so that it can perform a protection function in itself. It is not necessary to install overcurrent breaker, etc., and it is possible to determine the cause of overcurrent, restraint, open phase, reverse phase and abnormal input voltage. In addition, since the operation mode can be installed by a program and each set value can be selected and operated, the basic and optional driving modes of the motor, for example, manual control method, direct start method, Y-delta start method, reactor start method, etc. Can be provided as a function.

In addition, in the case of installing the remote switch box, it is possible to remotely control by connecting only three wires (including a power line) with the digital motor controller, so that the wiring can be greatly reduced.

In addition, when the system is configured to control the digital motor remote controllers from the remote control panel using a relay device, a large number of digital motor controllers may be connected to the relay device because only a serial communication line is connected between the digital motor controller and the relay device. Wiring is simplified even when connected, and the relay device collects information from each motor control device in a multi-communication manner, transmits the information to the remote control panel, and transmits control commands from the remote control panel to remotely control the motor.

1 is a configuration diagram of a conventional analog control method motor control device (MCC).

2 is a schematic diagram of a remote control apparatus of a conventional motor.

3 is a schematic diagram of a remote control apparatus for a motor using a conventional communication network.

Figure 4 is a block diagram of a digital motor remote control system according to the present invention.

5 is a detailed configuration diagram of a digital motor control device according to the present invention.

Figure 6 is a partial configuration of the Y- △ mobile digital motor control device for applying the present invention.

7 is a configuration diagram of a digital motor remote control system using a communication network according to the present invention.

<Description of the code | symbol about the principal part of drawing>

100: motor 110: magnet contactor

120: N.F.B 200: digital motor control device

210: photo isolation unit 211: photo coupler unit

212: relay drive unit 220: digital measurement unit

221: measurement input unit 222: input channel selector

223 measurement conversion unit 230 serial communication unit

240: FND display section 250: LED display section

260: central control unit 270: storage unit

280: operation setting unit 290: remote switch box communication unit

300: remote switch box 310: communication unit

320: operation setting unit 330: central control unit

340: LED display 400: data relay

500: remote control panel

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

4 is a block diagram of a digital motor remote control system according to the present invention.

The magnet contactor 110 for supplying / blocking three-phase power supplied through the relay (NFB) 120 to the motor 100 and the magnet contactor according to the motor operation control of the remote site and the current voltage state of the motor. 110 to control the driving of the motor 100, detects the current and voltage of each phase of the motor 100, converts them into digital signals, displays them together with the operating status, stores the driving status information, and operates the motor. Digital motor control device 200 for transmitting information to the remote site, and the digital motor control device 200 is connected to the communication line (3P) to the operation operation and status display of the motor 100 at the site where the motor control device is installed The remote switch box 300 and the digital motor control device 200 are connected to the communication line, and up to 64 motor control devices are connected per module to collect information on a plurality of motor control devices and to transmit remote control information. doing At least one data relay device 400 and the data relay device 400 are connected to each other through a communication network to collect information of each motor control device and to display the information to the operator and to provide the operator's control command to the data relay device 400. And a remote control panel 500 for controlling a plurality of motor control devices comprehensively at a remote location with a database of information on motor operation.

5 is a detailed configuration diagram of a digital motor control device according to the present invention.

Photo insulation unit 210 for controlling the magnet contactor 110 by isolating the motor drive control command of the digital motor controller, and detecting current and voltage of each phase of the motor 100 and converting them into digital values. It is connected to the digital measuring unit 220, the photo isolation unit 210, the digital measuring unit 220 and the main bus 201 to measure the motor status and control commands of the motor, and to store the status information, The central control unit 260 for communication and display control, the LED display unit 250 for displaying the operating states of the motor and the motor control apparatus under the control of the central control unit 260, and the 7-segment FND. FND display unit 240 for displaying the current value, state, and set value, non-volatile memory (Non Voltage SRAM) consisting of a storage unit 270 for storing the set value, and a small pushbutton switch consisting of current and start-up Time The operation setting unit 280 for determining and manipulating the operation of the device, and the remote switch box communication unit 290 which transmits an operation state signal to the remote switch box 300 and receives a control command and provides the control command to the central control unit 260. And a multi-serial communication unit 230 that performs serial communication with the data relay 400 and transmits and receives a device operating state and a control signal.

The photo isolation unit 210 is provided by a photo coupler unit 211 which insulates and transmits a control signal of the central control unit 260 from a relay driving power source, and a motor driving signal transmitted through the photo coupler unit 211. It is composed of a relay driver 212 for driving the relay of the magnet contactor (110).

The digital measurement unit 220, the measurement input unit 221 for measuring each phase current and voltage of the motor 100 through the CT and PT, respectively, and selects a channel for each phase current voltage signal of the measurement input unit 221 The input channel selector 222 receives an input, and a measurement converter 223 converts each current voltage input through the input channel selector 222 into a digital signal and inputs the digital signal to the central controller 260.

The remote switch box 300 is connected to the digital motor control apparatus 200 and connected through a communication unit 310 for communicating a motor state and a driving control command, and connected through each unit and the main bus 301 and received. Comprising a comparison operation with the reference value for the motor current voltage, the central control unit 300 performs a motor drive control and storage function, an LED display unit 340 for displaying the operation state of the motor, and a small push button switch each state It is composed of an operation setting unit 350 for setting the operation control.

And although not shown in the figure is configured to further include audible alarm means for generating a BEEP sound when the switch input and generates an audible alarm sound when an alarm occurs.

Figure 6 is a partial configuration of the Y-Δ mobile digital motor control device for applying the present invention.

In the Y- △ starting method by the motor driving method, three magnet contacts 110a, 110b, 110c are provided by the Y- △ connection as shown in FIG. 210a, 210b, and 210c are provided.

7 is a block diagram of a digital motor remote control system using a communication network according to the present invention. As shown in this, the data relay device 400,

Each board is connected to the digital motor device 200 and a serial communication line, and each board is provided with a maximum of 64 multi-communication drivers 410 for communicating with the serial communication unit of the motor control device, and the motor control device 200 from the motor control device 200. Relay device communication unit serial communication driver 420 for realizing the multi-communication by connecting the status display LED driver 440 and the status display LED 450 and the plurality of data relays in parallel to display the operation status of each motor collected And a PC communication unit serial communication driver 430 for executing communication with the remote control panel 500, and connected to the signal bus with each unit to collect information and communicate with the remote control panel of motor control apparatuses according to multi-communication. The control unit comprises a central control unit 460 for relaying the operation information and the control command.

Referring to the operation of the digital motor remote control system according to the present invention configured as described above are as follows.

The three-phase AC power for driving the motor is input through the N.F.B 120 to supply / block power through the magnet contactor 110 to drive the motor 100. When the power is turned on at the initial stage of the motor stop, the digital motor controller 200 sets the automatic and manual states at the time of Y- △ start (except direct start). Automatic control starts the motor automatically by operating the operation switch and switches to the operation mode when it reaches the normal state. In the manual mode, after a certain time has passed since the driver inputs the start switch, the motor is controlled in the operation mode by inserting the operation switch.

The motor control mode includes an MCC control mode directly controlled by the digital motor controller 200, a remote control mode controlled by the remote control panel 500 through communication, and a remote switch box 300 controlled on-site. It can be divided into field control mode.

In the MCC control mode, only the digital motor control apparatus 200, the remote communication control mode in the remote control panel 500, the field control mode in the remote switch box 300 can only change the state value and control commands. .

In the telecommunication control mode, the remote control panel 500 changes the set value in the GUI environment of the PC. The setting value changed by the remote control panel 500 is transmitted to the digital motor control apparatus 200 and stored in the storage unit 270 which is a nonvolatile memory.

In the case of the MCC control mode, it is changed by using the up, down, enter, and mode switches of the digital motor controller 200, and the changed setting value is stored in the storage unit 270 which is a non-volatile memory. Displayed through 240 and 250 to allow the operator to manipulate. The set values set in this way are stored in the nonvolatile memory and are not deleted even when the power is turned off.

The current setting is for protecting the motor from overcurrent, and sets the overcurrent upper limit of the motor. When the current flowing in the motor exceeds the upper limit value, the motor control device 200 generates a trip alarm and sends a control signal to the photo isolation unit 210 to operate the relay driver to turn on the relay power supply of the magnet contactor 110. Shut off and stop the motor.

The start delay time cannot be set in the current upper limit value because more current flows than the normal state when the initial power of the motor is turned on. Therefore, during initial start-up, a time for ignoring the current value exceeding a certain time is required, which is set as the start delay time.

In the operation time setting, if the current is cut off immediately when the current is exceeded even during normal operation of the motor, an unnecessary stop of the motor occurs. Therefore, it is necessary to allow the over time current. Accordingly, the time allowed for the overcurrent is set as the operation time.

The automatic operation time setting is to set the time to switch from start mode to run mode when the motor is auto-operated.If the auto operation time is set automatically, the auto start time is measured five times by measuring the time that the motor starts and stabilizes itself. Make a decision.

In case of changing the setting value as above, select the mode, change the setting value by pressing the OP / DOWN push button in each mode, and press the enter key to set the setting value, and this setting value is stored in the nonvolatile memory. . Therefore, it is not necessary to set the setting value every time and change it as necessary.

Operation control is controlled by the remote control panel 500, the digital motor controller 200 or the remote switch box 300 according to the control mode, the priority of the control is the remote switch box 300, the digital motor controller ( 200), the remote control panel 500 is given a priority order. For example, when the control mode is selected as the switch box in the remote switch box 300, the digital motor control device 200 and the remote control panel 500 cannot control the motor. The digital motor controller supports direct motor start and Y- △ start operation of the motor.

At start-up, sufficient excitation is required due to the characteristics of the induction motor so that the Y-connected relay of the relay drive unit is operated to reach the operating voltage of the motor. It does not work in direct start.

In operation, if the motor's operating voltage is reached after sufficient excitation, stop the Y-connected relay of the relay driver and drive the delta-connected relay of the relay driver to rotate the motor. Since it consumes a lot of current during initial start-up, it ignores the excess current during the set start delay time when the current value is exceeded, and after the start delay time, it continuously monitors whether overcurrent is detected beyond the set operating time. .

When the motor is normally started, the digital motor controller 200 continuously checks the current over state and the voltage fluctuation state and transmits the data to the remote control panel 500, and receives a stop command from the control unit according to the control mode.

The digital motor controller 200 supplies power to the motor 100 by controlling the magnet contactor 110 through the photo isolation unit 210 when the motor is started. The photo-isolator 210 operates the photo coupler 212 based on the motor control signal of the central controller 260, and the relay driver 211 operates the output of the photo coupler 212 to operate the magnet contactor. The relay of 110 is controlled. After starting the motor, the current and voltage of each phase of the motor 100 are measured through the measurement input unit 221 in the operation mode. The current and voltage of each phase are selected by the input channel through the input channel selector 222 and input to the measurement conversion unit 223, and the measurement conversion unit 223 converts analog current and voltage signals into digital current and voltage signals. The central control unit 260 is provided. The central controller 260 continuously monitors each phase current and voltage input from the digital measuring unit 220 while the motor is running, compared with the set values stored in the storage unit 270, and detects the overcurrent exceeding the allowable time. The motor is automatically stopped by opening the relay of the magnet contactor 110 through 210. In other words, the motor is protected by a method of shutting off the driving power of the motor without using an overcurrent cut-off switch. In addition, when an error occurs due to the overcurrent detection it is immediately alerted.

In addition, the digital motor controller 200 transmits the driving state information of the motor detected through the digital measurement unit 220 to the data relay device 400 through the serial communication unit 230. The data relay 400 is configured to enable multi-communication by connecting several units in parallel, and each of the data collection units includes a plurality of digital motor controllers and boards connected in a one-to-one manner, so that up to 64 digital motor controllers are provided. It is configured to connect with 200. Since only the serial communication line needs to be connected between the digital motor controller 200 and the data relay 400, the wiring is simplified and the connection with the remote controller is very simple. The remote communication unit of the data relay 400 selects and connects a plurality of boards in the data collecting device by multi communication to transmit and receive information to and from the remote control panel 500 through a communication network. That is, in the present invention, a large number of digital motor control apparatuses 200 may be connected to the data relay 400 only by a simple serial communication line to perform communication relay with the remote control panel 500.

In addition, the remote control panel 500 controls the motors using a window tool or a GUI environment, and comprehensively manages them and makes a database of information about each motor.

According to the present invention, the complicated wiring can be simplified compared to the existing analog motor control device, which shortens the air of the facility, drastically reduces the labor cost, and dramatically reduces the wiring even when configuring the remote monitoring system. It is possible to reduce the number of data relays and reduce the occupied area by reducing the number of data relays.

In addition, the built-in motor protection function eliminates the need for a separate protection device such as an electronic over-current switch or a thermal relay, and detects the current and voltage of each phase as a digital signal and analyzes and judges them by a program. It is effective to take corrective analysis and take action for phase loss, reverse phase, abnormal input voltage.

In addition, the existing analog device displays only operation, start, stop, and trip through the pilot lamp, and displays only one phase of the input current. However, the present invention measures and displays the trip current, start current, and input voltage of the three-phase power supply. It is effective to indicate the cause when it occurs.

In addition, since the communication module is basically built in the motor control device, it is not necessary to add expensive PLC for remote control, and it is easy to predict the failure and maintain the data by storing and analyzing the operating data in the remote control panel. It is effective to prevent large accidents and to operate efficiently.

In addition, the conventional control device has a disadvantage that the direct control of the magnetic relay by the panel switch operation, connecting the remote control using a PLC, and laying all the control lines up to the field switch box, but the present invention has a motor control device ( MCC) can be controlled by the switch attached to the module itself, remote communication control through the data relay device, and can be connected to the remote switch box by only three wires, the overall wiring and installation is much more advantageous.

Existing devices were available only for manual control and separate devices were required for automatic control. However, the present invention allows the mode to be set by the program, which enables manual control method, soft start control, direct start, Y-delta start, It is possible to provide the reactor start light, etc. as basic and optional functions.

Claims (7)

A magnet contactor 110 for supplying / blocking the three-phase power supplied through the relay (N.F.B) 120 to the motor 100, The magnet contactor 110 is controlled according to the motor operation control and the current voltage state of the remote control to control the driving of the motor 100, and detects the current and voltage of each phase of the motor 100 and converts it into a digital signal. A digital motor controller 200 for displaying the driving state and storing the driving state information and transmitting the motor driving information to a remote place; A remote switch box 300 connected to the digital motor controller 200 and a communication line 3P to display the operation and status of the motor 100 at a site where the motor controller is installed; At least one data relay device connected to the digital motor control device 200 by a communication line and connected with a maximum of 64 motor control devices per module to collect information of a plurality of motor control devices and to transmit remote control information. 400), It is connected to the data relay 400 through a communication network to collect and provide the information of each motor control device to the operator, and transmits the operator's control command to the data relay 400 and transmits information on motor operation to the database. And a remote control system using a communication network, characterized in that consisting of a remote control panel 500 for controlling a plurality of motor control devices comprehensively at a remote site. The method of claim 2, wherein the digital motor control device, A photo isolation unit 210 for controlling the magnet contactor 110 by isolating the motor drive control command of the digital motor controller; A digital measuring unit 220 which detects each phase current and voltage of the motor 100 and converts the current into a digital value; The photo isolation unit 210, the digital measurement unit 220, and the main bus 201 are connected to perform motor state measurement and driving control commands of the motor, and store state information, communicate with a remote site, and display control. And central control unit 260, LED display unit 250 for displaying the operating state of the motor and the motor control device under the control of the central control unit 260, 7-segment FND is configured to display the current value, state and set value FND display unit 240, A storage unit 270 configured as a nonvolatile memory (ROM) to store setting values; An operation setting unit 280 configured of a small pushbutton switch and configured to set a current and a start time, and to operate an apparatus; A remote switch box communication unit 290 for transmitting a driving state signal to the remote switch box 300 and receiving a control command and providing the control command to the central control unit 260; A digital motor remote control system using a communication network comprising a multi-serial communication unit 230 for transmitting and receiving a device operating state and control signals by performing serial communication with the data relay 400. The method of claim 3, wherein the photo isolation unit 210, The photo coupler unit 211 which insulates and transmits the control signal of the central controller 260 from the relay driving power source, and the relay of the magnet contactor 110 by the motor driving signal transmitted through the photo coupler unit 211. Digital motor remote control system using a communication network, characterized in that consisting of a relay drive unit 212 for driving. The method of claim 3, wherein the digital measurement unit 220, A measurement input unit 221 measuring current and voltage of each phase of the motor 100 through CT and PT, respectively; An input channel selector 222 for receiving a current input of each phase current voltage signal of the measurement input unit 221 by selecting a channel; Digital motor remote control system using a communication network, characterized in that consisting of a measurement conversion unit 223 for converting each current voltage input through the input channel selection unit 222 into a digital signal to be input to the central control unit 260. The method of claim 2, wherein the remote switch box 300, A communication unit 310 connected to the digital motor controller 200 for communicating motor state reception and driving control commands; A central control unit 300 connected to each unit and the main bus 301 to perform a comparative operation with respect to a reference value for the received motor current voltage and to control and store a motor; LED display unit 340 for displaying the operation state of the motor, and a small push button switch consisting of a remote control of the digital motor using a communication network, characterized in that it is composed of an operation setting unit 350 for controlling operation by setting each state Control system. The method according to claim 5 or 6, The digital motor controller and the remote switch box further comprises audible alarm means for generating a beep sound upon input of a switch of the operation setting unit and for generating an audible alarm sound when an alarm is generated. system. The data relay of claim 2, wherein the data relay device comprises: A multi-communication driver 410 connected to the digital motor device 200 by a serial communication line for each board and having a maximum of 64 boards installed therein to communicate with the serial communication unit of the motor control device; A status display LED driver 440 and a status display LED 450 indicating an operating state of each motor collected from the motor control apparatus 200; A serial device communication unit serial communication driver 420 for connecting a plurality of data relays in parallel to realize multi-communication; PC communication unit serial communication driver 430 for executing communication with the remote control panel 500, A communication network comprising: a central control unit 460 connected to each unit by a signal bus and controlling information collection of motor control devices and communication with a remote control panel according to multi-communication to relay processing of motor operation information and control commands. Digital motor remote control system using.