KR100715871B1 - An internal electric actuator controller for valve control - Google Patents

Abstract

The present invention relates to a built-in controller that can be mounted on a control panel for controlling an ELECTRIC ACTUATOR FOR VALVE CONTROL (hereinafter referred to as an actuator) to simplify the configuration of components and increase performance.

Various limit switch signals, overheat detector signals, and potentiometer signals for opening values of valves are input to the actuator, and the user's drive signal is input to receive the actuator's signal. The signal for controlling the reversing contactor driving the motor and the current status information can be provided to the user through various means.

The electric actuator controller for built-in valve driving of the present invention includes a LED display part, an LCD display part, a front part composed of a switch part, a rear part composed of a connection terminal, a control part composed of various control circuits, and a modular remote signal part for processing various remote user signals. It has a rectangular box-like shape that can be mounted on the control box.

ACTUATOR CONTROLLER Actuator Valve Switchgear

Description

Electric actuator controller for built-in valve actuation {AN INTERNAL ELECTRIC ACTUATOR CONTROLLER FOR VALVE CONTROL}

1 is a block diagram showing a built-in valve actuator electric actuator controller according to an embodiment of the present invention.

Figure 2 is a view showing the external appearance and side of the built-in valve actuator electric actuator controller according to an embodiment of the present invention.

3 is a diagram illustrating a connection with external devices according to an embodiment of the present invention.

4 is a view showing a connection of an AC reversible contactor according to an embodiment of the present invention.

5 is a diagram illustrating a connection of a SOLID STATE RELAY for direct current according to an embodiment of the present invention.

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

100: rear part 200: control unit

201: optical-insulation section 202: OP-AMP section

210: microprocessor 221: closed-triac

222: open-triac 230: remote-INTERFACE

240: power supply 300: front

301: LED display 302: LCD display

303: switch unit 400: remote signal unit

401: remote signal unit 1 402: remote signal unit 2

403: remote signal section 3 404: remote signal section 4

The present invention relates to an electric actuator controller for built-in valve driving, and a dedicated controller is required to control the actuator. Each actuator manufacturer also releases an actuator equipped with a dedicated controller, but according to the conditions of the installation site, a dedicated controller There is a case that cannot be used, and many users configure the controller altogether.

In order to configure the controller, single components such as transformers, relays, switches, display lamps, signal converters, and programmable logic controllers (PLCs) must be connected to each other, which requires a lot of time, cost, and size. Also, in order to perform the setting for optimization, it was cumbersome to operate the switch by opening the cover of each device.

Accordingly, a first object of the present invention for solving the above problems is to provide a built-in electric valve controller for driving a valve that is simple, easy to use and easy to use, which is equipped with various functions necessary for controlling the actuator and can be embedded in the control box. It is.

It is a second object of the present invention to provide a modularized module for selectively installing a suitable remote signal unit corresponding to a remote control system of various users.

A third object of the present invention is to provide convenience that can be driven regardless of whether the device for driving the motor of the actuator is a reversible contactor requiring alternating current or an SSR (SOLID STATE RELAY) using direct current.

It is a fourth object of the present invention to provide a function of performing a setting operation without opening an enclosure of a controller by using an LCD display unit and a switch unit of a front panel.

According to the first aspect of the present invention for achieving the above objects, the control circuit composed mainly of a microprocessor is miniaturized, receiving various limit switches, overheat detectors and variable resistors input from the actuator, Input and process the user's remote control signal and output the result value, current status of actuator and various error messages to the LED display and LCD display on the front, and transmit to the remote user system through the installed remote signal. It is characterized by having.

According to the second aspect of the present invention, the remote signal unit 1 which receives a command signal used in the user's remote control system as a contact point and outputs a state signal as a relay signal, receives a command signal as a contact point and receives a state signal 4-20 mA Remote signal unit 2 for outputting a current signal of the signal, Remote signal unit 3 for inputting a command signal as a current signal of 4-20 mA and outputting a status signal as a current signal of 4-20 mA, and a command signal and a status signal Characterized in that it can be used by mounting one of the modules (MODULE) consisting of a remote signal unit 4 processing through communication.

According to the third aspect of the present invention, various types of reversible contactors and SSR (SOLID STATE RELAY) can be used according to the capacity or control method of the motor of the actuator. When using the reversible contactors, the power supply of the built-in valve driving electric actuator controller is used. The alternating current input may be used in common. In order to drive SSR using direct current, built-in valve driving electric actuator controller outputs DC 24V separately, and uses triac that can operate in both AC and DC as reversible contactor or SSR drive element and user connects separately. Characterized in that it can be. This has the advantage of not having to install a separate power supply to the control box.

According to the fourth aspect of the present invention, the LCD display of the front part can display letters, numbers, symbols, etc., so that in the SET mode, the setting menu is displayed on the LCD display, and the next menu is displayed through the operation of the switch part or the numerical value is displayed on the menu. And whether or not to input. At this time, since the inputted value is stored in the EEPROM inside the microprocessor, the built-in valve actuator electric actuator controller has an advantage of being able to finish the setting work without opening the enclosure.

Hereinafter, the above-described contents will be described in detail through the embodiment of the present invention.

1 is a block diagram of a built-in electric valve controller for electric actuator (hereinafter, a built-in controller) according to an embodiment of the present invention. The built-in controller can be divided into four parts, which can be divided into the controller 200, the front part 300, the remote signal part 400, and the back part 100 shown in FIG. The control unit inputs signals from the CLOSE LIMIT SWITCH, OPEN LIMIT SWITCH, CLOSE TORQUE SWITCH, OPEN TORQUE SWITCH, and OPEN TORQUE SWITCH input from the actuator. The microprocessor 210 is input to the microprocessor 210 through the photo-isolator 201, and the variable resistor input indicating the opening of the valve is input to the microprocessor 210 through the OP-AMP unit 202. The photo-isolator 201 insulates electrical signals of various input limit switches from electrical signals used by the microprocessor to increase reliability. In addition, the OP-AMP unit 202 serves to insulate the electrical signal of the variable resistor and the electrical signal of the microprocessor and the waveform shaping to be input as an analog signal.

The microprocessor 210 receives a user's remote command through the remote signal unit 400 connected to the front part 300 and the remote INTERFACE 230 and outputs status information. Finally, the microprocessor 210 is a device that drives a motor of an actuator. The control signal is output to the closing-triac (TRIAC) 221 and the opening-triac 222 for driving the reversible contactor or the SSR.

The front part 300 includes an LED display unit 301 for displaying a signal output from the microprocessor, an LCD display unit 302, and a switch unit 303 input to the microprocessor. The switch unit 303 causes the actuator to close and operate in the LOCAL mode and the ENTER switch used for inputting the numerical value when the setting operation is performed with the mode switch in which the operation mode is changed to OFF, REMOTE, LOCAL, and SET at each press. It is composed of a CLOSE switch which can be set at mid-time and a stop switch that can open the drive, and an OPEN switch that can open.In the setting work, the CLOSE switch is used for increasing the value and the STOP switch is used for decreasing the value. , OPEN switch is used as CANCEL switch respectively. LED display part is remote LED to indicate that it is operating in remote mode, LOCAL LED to indicate that it is operating according to input of switch part of front panel, CLOSE LED which is flickered when actuator is in the closing operation state, and is turned on when close limit switch is ON, Flashes when the actuator fails or fails to perform an operation due to a faulty command. The FAULT LED illuminates when the closing torque switch or the open torque switch is on, and flashes when the actuator is in the open operation, and turns on when the open limit switch is on. It consists of LEDs. In addition, the LCD display shows the status of the actuator's four operation modes: OFF, REMOTE, LOCAL, and SET, and their current address during digital communication, and the current open state input from the variable resistance of the actuator. The operation status and error message of are displayed at the same time, and various menus are displayed in the setting operation.

The remote signal unit 400 is composed of four modules (MODULE) and only one module is installed in one embedded controller. The first module, the remote signal unit 1 (401) is a monitor relay indicating that normal remote operation is possible through a relay output by receiving a signal of close, stop, and open by a user's remote command signal, and a relay during a closing operation and an opening operation. It outputs status signals such as relay and FAULT relay and requires the most wiring. If necessary, the user can connect the actuator's close limit switch and open limit switch directly without going through the built-in controller. The second module, the remote signal unit 2 402 receives a signal of close, stop, and open as a user's remote command signal, and outputs an opening degree of the actuator as a current signal of 4-20 mA. The third module, the remote signal unit 3 (403) receives a current signal of 4-20 mA as a remote command signal, performs an opening operation proportional to the magnitude of the current, and then outputs an opening degree of the actuator as a current signal of 4-20 mA. . The fourth module, the remote signal unit 4 (404) transmits and receives commands and status signals through digital bidirectional communication, and since several built-in controllers can share a single wire, the number of wires can be reduced.

The switch unit 303 has an operation mode (MODE) switch which is changed every time the mode of OFF, REMOTE, LOCAL, and SET is pressed. In the OFF mode, all actuators are rejected and only the status signal output and the display are operated. REMOTE mode is a state in which the actuator is driven only through the remote signal unit 400 to which the command of the user's remote control system is input, LOCAL mode is a state to drive the actuator through the operation of the switch unit 303 , SET mode is the state to perform the setting work (SETTING) required for the actuator operation.

3 is a view showing the connection between the built-in controller and the external devices, the actuator is a close limit switch (CLOSE LIMIT SWITCH) is set in a state in which the valve is fully closed and the maximum torque setting during the closing operation (TORQUE) is closed OPEN LIMIT SWITCH with CLOSE TORQUE SWITCH and the valve fully open and OPEN LIMIT SWITCH with the maximum allowable torque value set during open operation. Inputs the variable resistance signal which outputs THERMOSTAT and the valve open state as a resistance value to the built-in controller, and operates the actuator motor in the direction of closing or opening according to the user's command based on this value. Once you have decided what to do, you will drive the triac (TRIAC) that will drive the reversible contactor or SSR. The actuator is driven.

Actuators need to be interfaced with remote users, as it is common to operate them remotely rather than directly in the field. The remote user controls the actuator through various contact signals, current signals, and digital communications, depending on the control system. Built-in valve-driven electric actuator controllers are at the heart of the control system and are used as actuator actuators in the field.

Looking at the operation of the embedded controller having the above-described configuration as follows.

The operation of the built-in controller can select one of OFF, REMOTE, LOCAL, and SET modes by operating the operation mode switch of the switch unit 303. All functions depend on the operation mode and operate according to each operation mode. 1 and 2 will be described in detail with reference to FIG.

First, when the operation mode switch is set to OFF, the open and close commands transmitted to the switch unit 303 of the embedded controller and the open and close commands transmitted through the remote signal unit 400 are ignored. Since the actuator can open and close the valve manually, the state information of various actuators is transmitted through the LED display unit 301, the LCD display unit 302, and the remote signal unit 400, and is continuously updated.

Secondly, the operation mode switch is set to REMOTE, and an opening operation in proportion to a close, stop, and open command or a 4-20 mA current signal input through the remote signal unit 400 of the embedded controller is executed. At this time, the open, stop, and close commands input to the switch unit 303 are ignored, but status signals are output to the LED display unit 301 and the LCD display unit 302 and are continuously updated.

Third, if the operation mode switch is set to LOCAL, a close, stop, and open command input to the switch unit 303 of the embedded controller is executed. The command signal of the remote signal unit 400 is ignored, but the status signal is output.

Fourth, when the operation mode switch is set to SET, the setting menu is displayed on the LCD display unit 302. In this case, the function of each switch of the switch unit 303 is changed. The CLOSE switch is used to input the value in the direction of increasing the value and to scroll the menu upward. The STOP switch is responsible for entering the value in the direction of decreasing the value and to scroll the menu downward. The OPEN switch cancels the menu. Use as a function. When the menu appears on the LCD display 302, scroll to the upper menu with the CLOSE switch, STOP switch to the lower menu to display the desired menu, operate the ENTER switch to enter the menu, and enter the menu. If you operate the CLOSE switch to increase the rear value and the STOP key to decrease it, and then press the ENTER switch, the value is stored in the EEPROM inside the microprocessor 210. To cancel and exit the menu, operate the OPEN switch. Through this method, an optimized control environment can be established by simply inputting items such as digital communication address required for operating the actuator, dead band of 4-20mA current signal, delay time, and rotation direction in case of emergency.

In fact, the state in which the actuator can be driven is the REMOTE mode and the LOCAL mode, and the two operation modes determine only whether to accept the control command of the actuator through the switch unit 303 or the remote signal unit 400. Other operations are performed in the same way. Therefore, the operation of the actuator in these two operation modes will be described in more detail as follows. First, when the close command is input, the microprocessor 210 checks the overheat detector, the close limit switch, and the close torque switch, and drives the close-triac when both are OFF and closes-tri when there is no change in the value of the variable resistor for a predetermined time. Stops the liquid and outputs the 'VALVE JAM' signal, which is a state in which the valve is tight. If there is no abnormality, the CLOSE LED of the LED display unit 301 blinks, the opening degree display of the LCD display unit 302 is updated, and the state signal is remotely output through the remote signal unit 400. If the closing torque switch is ON during operation, stop the closing-triac and output 'OVER TORQUE' signal.If the closing limit switch is ON, the operation is stopped and the CLOSE LAMP of the LED display is continuously lit and the 'FULL CLOSED' is displayed on the LCD display. 'Is displayed, and status signal is also output remotely. In addition, when the open command is input, the microprocessor 210 inspects the overheat detector, the open limit switch, and the open torque switch to drive the open-triac when both are OFF, and open-tria when there is no change in the value of the variable resistor for a predetermined time. Stop the liquid and output the 'VALVE JAM' signal. If there is no abnormality, the OPEN LED of the LED display unit 301 blinks, the opening degree display of the LCD display unit 302 is updated, and the state signal is remotely output through the remote signal unit 400. If the open torque switch is on during operation, stop the open-triac and output 'OVER TORQUE' signal.If the open limit switch is on, stop the operation and keep the OPEN LAMP on the LED display on and the 'FULL OPEN' on the LCD display. 'Is displayed, and status signal is also output remotely.

In general, the SWITCHING device is a low-cost reversible contactor, but the SSR (SOLID STATE RELAY) is a semi-permanent life-span in a contactless manner for frequent actuator start-up or special applications. The embedded controller allows the connection of two switching elements in a simple way. Fig. 4 shows the connection when the reversible contactor is used as the motor switching element. One terminal of the closing-triac 221 is connected to the AC power source 110 commonly used with the built-in controller, the other terminal is connected to the closing-reversible contactor, and one terminal of the closing-reversible contactor is the terminal of the other AC power supply. And one terminal of the open-triac 222 is connected to an AC power source, the other terminal is connected to an open-reversible contactor, and one terminal of the open-reversible contactor is input to a terminal of another AC power source. . Thus, if one terminal of the triac is not connected to a specific power supply in advance, various reversible contactors can be selected and used according to the capacity of the motor. FIG. 5 shows a connection when SSR (SOLID STATE RELAY) is used as the motor switching element, and a part similar to the description of the reversible contactor described above is omitted. If you use a separate DC power supply, you can easily connect the SSR.

As described above, the built-in valve driving electric actuator controller of the present invention is compact and has a variety of control functions to reduce the time and cost when manufacturing the control box, by providing a modular remote signal unit to the user desired control method It is possible to select, and provides a convenience that can perform various setting operations without opening the cover of the controller.

Claims (4)

Control unit 200 and a field consisting of a microprocessor for generating a variety of signals by receiving the signal of the closing limit switch, opening limit switch, closing torque switch, opening torque switch, overheat detector, variable resistor from the valve actuator electric actuator Display various status information to the user of the front part 300 and receive the user's command from the remote can be connected to the remote signal unit 400 and the external circuit to receive the user's command, and transmit various status information Built-in valve driving electric actuator controller, characterized in that consisting of various terminals so that it can be used in the control box mounted inside. The method of claim 1, Built-in type, characterized in that the remote signal unit 400 is made of a module (MODULE), such as remote signal unit 1, remote signal unit 2, remote signal unit 3 and remote signal unit 4, and can be mounted only the module required by the user Electric actuator controller for valve drive. delete The method of claim 1, Built-in type, characterized in that the setting operation using the LCD display unit and the switch unit of the front part 300 and store the value in the EEPROM inside the microprocessor to perform the setting operation without opening the enclosure Electric actuator controller for valve drive.

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