KR20200069707A - Fail safe device - Google Patents

Abstract

A fail safe device of the present invention includes: an actuator unit that moves a valve using electricity as a power source; and a fail safe unit that supplies pre-charged emergency electricity to the actuator unit when supply of external electricity to the actuator unit is stopped. Moreover, the actuator unit can move the valve using the emergency electricity even when the external electricity is cut off.

Description

FAIL SAFE DEVICE

The present invention relates to a fail-safe device for urgently driving the actuator in the event of a power failure or accident in which the supply of external power to the actuator is limited.

Typically, a valve (valve) is to be installed in the pipe or equipment and devices, etc. to control the flow rate control and flow interruption, refers to a device having a movable mechanism capable of opening and closing the flow path. The main components are basically composed of a valve body, a valve seat, and a disc, and the opening and closing of the flow path by the valve is performed by rotation or up/down action of the disc.

According to the method of controlling the opening and closing of the flow path, it is classified into a manual valve manually operated by an operator and an automatic valve driven by a control device that is an automatic regulating device.

Electric valve, which is a kind of automatic valve, is a kind of valve that can electrically control the flow of fluid. Valves that can be controlled similarly include pneumatic valves and solenoid valves. Typically, the electric valve controls the flow of fluid by opening and closing the valve in a mechanical manner using a motor. Unlike other valves, energy is consumed only when the state is changed, and energy is not required to maintain the state. In addition, relatively large valves are controllable and simple to use, making them widely used throughout the industry.

However, in the case of such an existing electric valve, when an external power is interrupted due to a power outage or disconnection/short circuit, the valve has no supply power to drive the motor, and thus the operation of the valve must be maintained. .

In this case, the user cannot control the valve, which may cause an accident.

In addition, even though the handle to manually open and close the valve can be used when the power is cut off from the electric valve, the valve cannot be controlled because it cannot be operated manually if the user does not know whether the power is off. do.

Korean Registered Patent Publication No. 1259450 discloses a technique to operate a valve using electric power stored in an internal energy storage device.

Korean Registered Patent Publication No. 1259450

The present invention is to provide a fail safe device capable of urgently actuating a valve in an emergency.

The technical problems to be achieved by the present invention are not limited to the technical problems mentioned above, and other technical problems that are not mentioned will be clearly understood by those skilled in the art from the following description. Will be able to.

The fail safe device of the present invention includes an actuator unit that moves a valve using electricity as a power source; When the supply of the external electricity to the actuator unit is stopped, a fail-safe unit for supplying the pre-charged emergency electricity to the actuator unit; includes, the actuator unit using the emergency electricity even when the external electricity is cut off The valve can be moved.

The fail safe device of the present invention can move the valve to a predetermined position even when the external electricity that operates the motor is cut off.

Since the fail safe device of the present invention moves a valve using a battery, it can be operated in multiple times rather than in one time.

In addition, the fail-safe device of the present invention can distinguish between a remote mode for remotely controlling an actuator unit operating a valve, a local mode for operating while directly touching the actuator unit, and provide a fail-safe function optimized for each mode.

1 is a perspective view showing a fail safe device of the present invention.
2 is a schematic view of a portion of the fail-safe device of the present invention.
3 is a schematic view showing a valve and an actuator portion of a comparative example.
4 is a schematic diagram showing a fail-safe device of a spring return method.
5 is a cross-sectional view showing a fail safe device of the present invention.

Hereinafter, embodiments according to the present invention will be described in detail with reference to the accompanying drawings. In this process, the size or shape of components shown in the drawings may be exaggerated for clarity and convenience of description. In addition, terms specifically defined in consideration of the configuration and operation of the present invention may vary depending on the intention or custom of the user or operator. Definitions of these terms should be made based on the contents throughout this specification.

1 is a perspective view showing a fail safe device of the present invention. 2 is a schematic view of a portion of the fail-safe device of the present invention. 3 is a schematic view showing a valve 30 and an actuator portion 100 of a comparative embodiment. 4 is a schematic diagram showing a fail-safe device of a spring return method. 5 is a cross-sectional view showing a fail safe device of the present invention.

The fail safe device illustrated in the drawing may include an actuator unit 100 and a fail safe unit 200.

The actuator unit 100 may move the valve 30 using electricity as a power source. For example, the actuator unit 100 may include a motor 110 that rotates or linearly moves when electricity is input. It is preferable that the motor 110 at this time reaches the maximum torque immediately upon start-up and almost no excessive rotation occurs when the power is turned off. In addition, in order to prevent overheating, the motor 110 may be provided with a thermostat that senses temperature.

A gear box equipped with one or more gears may be inserted between the shaft of the motor 110 and the valve 30.

For normal operation of the actuator unit 100, supply of external electricity is required. If an emergency situation in which the supply of external electricity is interrupted, such as a power failure, occurs, a follow-up action on the valve 30 may be required. For example, the valve 30 may adjust the flow rate of the fluid flowing along a specific tube. It is possible to flow the fluid only at a set flow rate and to close the pipe using the valve 30. When an emergency occurs in a state in which the valve 30 is opened so that a fluid having a set flow rate flows, the actuator unit 100 operating the valve 30 is stopped. Therefore, the valve 30 also stops as it is with the tube open, and the fluid continues to flow beyond the set flow rate. At this time, various problems may occur due to the fluid exceeding the set flow rate. Conversely, as a result of the occurrence of an emergency situation, a case in which the flow of fluid is blocked in a state in which the set flow rate is not satisfied may also occur, and in this case, various problems may be caused.

The fail-safe unit 200 may be used to prevent serious damage due to the valve 30 that is not normally controlled in an emergency situation.

The fail-safe unit 200 may perform a fail-safe function to secure safety without being connected to an accident or a disaster by congestion in the event of an emergency or a machine failure.

For example, when the supply of the external electricity to the actuator unit 100 is stopped, the fail-safe unit 200 may supply pre-charged emergency electricity to the actuator unit 100. The emergency electricity may include electric power capable of emergency operation of the actuator unit 100. For example, the emergency electricity may electrically operate the motor 110 provided in the actuator unit 100.

Accordingly, the actuator unit 100 can move the valve 30 using emergency electricity even when the external electricity is cut off.

The fail-safe unit 200 may include a battery 170 charged with emergency electricity, and a switching means for controlling electrical connection between the actuator unit 100 and the battery 170.

The switching means may block electrical connection between the actuator unit 100 and the battery 170 when external electricity is supplied to the actuator unit 100.

The switching means may electrically connect the actuator unit 100 and the battery 170 when the supply of external electricity is stopped.

Unlike external electricity, emergency electricity stored in the battery 170 is bound to be limited. It is preferable that the actuator using the emergency electricity with limited capacity moves the valve 30 from the current position to a predetermined emergency position at a shortest distance or shortest angle.

The actuator unit 100 may operate in a normal mode in which the valve 30 is moved according to an external control signal when external electricity is supplied.

The actuator unit 100 may operate in an emergency mode in which the valve 30 is moved to a predetermined emergency position, ignoring the external control signal when emergency electricity is supplied due to blocking of external electricity.

When the valve 30 is moved to the emergency position in the emergency mode, the fail-safe unit 200 may stop supply of emergency electricity to the actuator unit 100.

By stopping the supply of emergency electricity to the actuator unit 100, the valve 30 can maintain the emergency position until supply of external electricity is resumed.

The fail safe part 200 may be formed integrally with the actuator part 100 or may be formed in an integral unit mounted on the actuator part 100.

For example, the valve 30 is installed in the pipe 90 through which the fluid flows, and the valve shaft 31 may extend outside the pipe. The actuator unit 100 may be provided with a base 101 fastened to the outer circumferential surface of the tube, and a cover 103 covering the base 101. At this time, on one surface of the base 101 facing the valve shaft 31, connecting means 104 such as a groove connected to the valve shaft 31 may be installed to be movable or rotatable relative to the base 101.

The base 101 may be provided with a motor 110, a gear box, an open gauge 130, a limit switch 150, a battery 170, and the like. The motor 110, the gear box, the open gauge 130, the limit switch 150, the battery 170, and the like may be covered by the cover 103. The shaft or gear box of the motor 110 can be linked to the connecting means 104.

The openness meter 130 may display the exact position of the valve 30 as a percentage. The battery 170 is an element in which emergency electricity is stored, and may be installed in the actuator unit 100 or may be installed in a separate integrated unit. 1 and 2, a portion of the fail safe unit 200 is formed in a separate integrated unit, and a battery 170 forming the fail safe unit 200 is formed in the actuator unit 100.

The limit switch 150 may determine a rotation range limit value of the valve shaft 31.

The integral unit can replace the field control panel with a non-penetrating structure in which the front control unit and the inside are completely separated. A wired cable connecting the management server and the actuator unit 100 may be connected to the integrated unit.

3(a) is a comparative embodiment in which the fail safe part 200 is excluded, and FIG. 3(b) is a comparative embodiment in which the spring return part 8 is applied. In the comparative example of FIG. 3, the integral unit is excluded, but may be added similarly to FIGS. 1 and 2 for control and maintenance of the actuator unit 100.

In the case of the comparative embodiment in which the spring return unit 8 is excluded, it is possible to miniaturize as the separate spring return unit 8 is excluded. However, it is advantageous to apply to the tube 90 in which the flow of the fluid does not cause a big problem because the handling in case of an emergency is insufficient.

To cope with the emergency situation, a separate spring return unit 8 may be added to the actuator unit 100 as shown in FIG. 3(b). The spring return unit 8 may restore the valve 30 to a set position by the elastic force of the spring in an emergency. Since the spring return unit 8 releases the elastic force of the spring once it is operated, it can be used only once, and there is a problem in that it is necessary to rewind the spring by the user for reuse. In addition, since a separate spring return unit 8 is required in addition to the actuator unit 100 and the integral unit, miniaturization may be limited.

The fail-safe device of the present invention is installed inside the actuator unit 100 and can respond to an emergency by using the motor 110 moving the valve 30 as usual by an external control signal. At this time, among the components of the fail-safe unit 200, a control module excluding the battery 170, a communication module, and the like can be mounted on an electric board installed in the existing actuator unit 100 or the integral unit. Therefore, the fail safe device of the present invention is similar to that in which only the battery 170 is added to the actuator unit 100 or the integral unit. Therefore, the miniaturization is not seriously limited, and the fail-safe function is easily restored through recharging of the battery 170.

When the battery 170 is discharged, the fail-safe unit 200 may charge the battery 170 using external electricity. During an emergency operation of the actuator in an emergency situation, emergency electricity stored in the battery 170 may be discharged toward the motor 110. At this time, the discharged emergency electricity can be simply charged by external electricity that is re-supplied when the emergency situation is released.

On the other hand, if the emergency electricity of the battery 170 is insufficient due to normal natural discharge or the like, it may be difficult to urgently operate the actuator unit 100 in an emergency situation. Therefore, the charge amount of the battery 170 needs to be always maintained at an appropriate value or higher. In order to maintain the charge amount, the fail-safe unit 200 may generate a warning signal and transmit it to the management server when the charge amount of the battery 170 is equal to or less than the set value.

On the other hand, it is preferable that a method for a user who visits a site where the actuator unit 100 is installed to directly control the actuator unit 100 in the field.

For example, an adjustment unit 210 for controlling the actuator unit 100 may be provided together in the actuator unit 100 (including an integral unit). The control unit 210 may include various buttons and a touch screen that can be operated by a user.

The adjustment unit 210 may be installed on the outer surface of the base 101 or the cover 103 constituting the actuator unit 100. The adjustment unit 210 may be installed on the outer surface of the integral unit mounted on the actuator unit 100.

The control unit 210 may electrically control or operate the actuator unit 100 using external electricity or emergency electricity.

A switching unit 120 for selectively linking the valve 30 to the handle unit 140, the actuator unit 100, or the handle unit 140 that directly moves the valve 30 may be provided.

At this time, the handle unit 140 is preferably operated entirely by the user's force. Therefore, the adjustment unit 210 can control the actuator unit 100 while leaving the handle unit 140 as it is. To this end, the adjustment unit 210 for controlling the actuator unit 100 is preferably provided together with the actuator unit 100.

The adjusting unit 210 may be provided with a first operating means 211, a second operating means, and a third operating means. Each operation means may include an input device such as a button exposed on the outer surface.

The first operation means 211 may be formed to select a remote mode or a local mode. Alternatively, the first operation means 211 may be formed to select one of a remote mode, a local mode, and an off mode.

The remote mode may be an operation mode for controlling the actuator unit 100 using an external control signal obtained from a remote management server.

The local mode may be an operation mode in which the actuator unit 100 is controlled using the second operating means. The local mode may be a mode that ensures that a user visiting the site directly operates the actuator unit 100 or moves the valve 30.

The fail-safe unit 200 may supply emergency electricity to the actuator unit 100 when supply of external electricity is interrupted regardless of the remote mode and the local mode.

When the supply of external electricity is stopped, basically, the actuator unit 100 may move the valve 30 to a preset emergency position using emergency electricity regardless of the remote mode and local mode. The emergency position at this time can be freely set and it is good to be set before the emergency. The off mode may be used to release the restriction of the forced emergency position in case of an emergency or to set various options of the actuator unit 100.

The off mode may be a mode for forcibly stopping the operation of the actuator unit 100.

An option menu for determining the operation of the actuator unit 100 when the supply of external electricity is stopped may be provided in the off mode. At this time, the third operation means may operate or set the option menu.

A remote switch and a local switch may be provided in the control unit 210 for setting the operation of the actuator unit 100 in a situation where emergency electricity is supplied.

The remote switch may set the operation of the actuator unit 100 in an emergency situation generated while controlling (remote mode) the actuator unit 100 using an external control signal.

The local switch may set the operation of the actuator unit 100 in an emergency situation generated while controlling (local mode) the actuator unit 100 using the second operating means provided in the adjusting unit 210.

The option menu is shown in FIG. 5. 5 illustrates a dip switch as an example of the control unit 210, the control unit 210 can be replaced with various mechanical buttons, a touch screen, and the like to select, adjust, and set an option menu.

The first menu ① of FIG. 5 may be a menu for setting the operation direction of the valve 30.

The second menu ② may be a menu for determining whether to stop the limit or maintain the torque.

The third menu ③ may be a reverse phase detection mode or a menu for setting an automatic phase.

The fourth menu ④ may be a menu for setting the operation of the emergency situation generated during the local mode. A button or switch capable of setting the fourth menu ④ may correspond to the previous local switch.

In the embodiment of FIG. 5, when the fourth menu ④ is turned off, a basic mode may be operated in an emergency among local modes. The basic mode may be a mode in which the actuator unit 100 operates according to the setting of the fifth menu ⑤.

When the fourth menu ④ is turned on, a local mode in which the user can adjust the actuator may be maintained. That is, the actuator unit 100 may move the actuator and the valve 30 using emergency electricity according to a control signal based on the local mode.

If an emergency occurs while adjusting the actuator unit 100 in the local mode, the valve 30 moves to the emergency position regardless of the user's operation. According to the present invention, since the supply of emergency electricity to the actuator unit 100 is stopped after the valve 30 is moved to the emergency position, it is difficult for a user at the site to adjust the valve 30 according to the site situation.

According to the present embodiment, a method for adjusting the valve 30 differently from the preset emergency position even in an emergency situation according to the judgment of a field worker may be presented.

The user may turn off the fourth menu ④ through the option menu after selecting the off mode using the first manipulation means 211.

When the fourth menu ④ is on, the user can additionally open or close the valve 30 using the second operation means.

The fifth menu ⑤ may be a menu for setting the operation of the emergency situation generated during the remote mode. A button or switch capable of setting the fifth menu ⑤ may correspond to a remote switch.

The fifth menu ⑤ may set one of an open mode for controlling to open the valve 30, a closed mode for controlling to close the valve 30, and a maintenance mode for maintaining the valve 30 in its current state.

Looking at the configuration and operating relationship of the present invention, the fail safe device of the present invention is installed in a control box of a conventional electric actuator so that the valve 30 is driven by electric energy. At this time, the control box may include an actuator unit 100 case and an integral unit case.

The fail-safe device of the present invention includes a valve shaft 31, a motor 110 driven by electric power supplied, and a reduction gear as a movable mechanism capable of opening and closing a flow path in a rotational manner, thereby rotating torque of the electric motor 110 To the valve shaft 31, the limit box 150 to determine by limiting the rotation range of the valve shaft 31, the control to control the operation of the motor 110 according to the signal received by the control signal line The valve 30 is converted into a stable state by using the stored power even when the external power is cut off, including a battery 170 that charges power when the circuit and external power are being supplied and supplies the stored power when the external power is cut off/ To be maintained.

The valve shaft 31 is generally connected to the disc 30 to control the opening and closing of the flow path, so that the disc opens and closes the valve 30 according to the hinge rotation in the valve shaft 31. The flow rate and flow rate of the fluid flowing in the tube can be adjusted according to the degree of closing of the disc. The valve shaft 31 is desirably allowed to operate sufficiently under rotational torque supplied by the motor 110 in a state where there is little friction.

The gearbox transmits the rotational force and speed generated by the electrically operated motor 110 to the valve shaft 31 appropriately for opening and closing the flow path using a plurality of reduction gears. Inside the gear box, there are gears of various diameters that mesh with gears connected to the rotating shaft of the electric motor 110, which converts the fast rotational speed and small rotational force of the motor 110 into slow and large rotational forces.

The motor 110 is an electric motor 110 that is active in the general mechanical industry, and is operated by electric power supplied from the outside or by charged power of the battery 170 included therein. The induction motor 110 may be used as the motor 110, and the valve shaft 31 is rotated while generating various torques and speeds by an appropriate reduction gear and a power transmission device. Therefore, it is preferable that the gear is integrally formed on the rotating shaft of the motor 110, and it is engaged with gears of various diameters of the gear box to realize deceleration and conversion to strong rotational force.

The control circuit controls the power supplied from the external power line or the internal battery 170 to the motor 110 according to a signal input from the control signal line. Therefore, as well as when the user inputs an operation signal through a control signal line externally for the operation of the valve 30, when the valve 30 is to be operated under certain conditions, it is controlled when an operation signal is automatically input from the outside. The circuit 110 allows the motor 110 to operate with power supplied through a power line.

The limit switch 150 is normally spaced apart from the valve shaft 31 by a predetermined distance and is present on both sides, and serves to adjust the rotational radius of the valve shaft 31. As the limit switch 150 rotates a disk or the like connected to the valve shaft 31 by a radius of circumference around the valve shaft 31, the flow path is interrupted.

The battery 170 may charge external power supplied from the control device of the electric valve 30 of the present invention. Accordingly, when power is supplied from the outside, a state in which the power is sufficiently charged is maintained, and when the external power is cut off, the electric motor 110 can be operated with the charged power. Therefore, the energy storage device must be connected to the power line, and when the external power is cut off, power is supplied to the control circuit and the electric motor 110 through the power line drawn therein.

Accordingly, when power is supplied to the power line, power is stored in the battery 170 connected thereto. When the power supply is interrupted due to a power failure, the control circuit supplies power to the motor 110 so that the valve 30 can be converted/maintained in a stable state by using the power stored in the storage device. At this time, the delay timer operates according to the user's setting, and after the power supply is cut off, it can be converted/maintained to a stable state after a predetermined time.

Therefore, when the power to the electric valve 30 is cut off, it is possible to convert/maintain in a stable state according to the user's setting, so that the valve 30 to be closed is opened due to the loss of power supply, so that the internal fluid is leaked or opened. (30) can be closed to prevent accidents such as explosion due to overpressure. In addition, it can be effectively employed in the installation of the electric valve 30 where safety is important.

According to an embodiment of the present invention, power supplied from the control circuit to the power line is supplied to the motor 110 according to the signal of the control signal line. The motor 110 rotates the torque through a gear box including a reduction gear. Transfer to (31) to open and close the valve (30). At this time, the rotation range is determined by the limit switch 150. The battery 170 is connected to the power line, so as to charge the external power supplied and to supply the stored power to the electric motor 110 and the control circuit when the external power is cut off.

After the external power supply is cut off, a delay timer to convert/maintain a stable state after a set time according to a user's setting may be additionally included.

The delay timer performs a function of supplying the stored power to the battery 170 only after a predetermined period of time after the external power is cut off according to the time set by the user in advance.

The valve 30 does not continuously regulate the opening and closing of the flow path, but operates when receiving a signal of the operation of the valve 30 through a control signal line, and power is usually required only when the valve 30 is operated. In this case, when an external power source such as a power outage is cut off, the external power source may be temporarily cut off. In this case, it is not necessary to receive power from the battery 170. Accordingly, the user can set the internal battery 170 to supply power after a certain period of time in consideration of the external power off due to a temporary power failure.

The delay timer is connected to the control circuit, and when external power is cut off, power is supplied from the battery 170 through the control circuit after a predetermined time set by the user.

The present invention may further include a power-off detection device for detecting whether or not the external power supply is cut off. In addition, although not shown in the drawings, the power-off detection device may be configured to sound a warning sound so that the user can recognize when power supplied from the outside is cut off.

The power cut-off detection device is a device that detects whether power supplied from the outside is cut off through a power line, and is usually connected to a power line and a control circuit.

When the present invention includes a delay timer, the power-off detection device may be directly connected to the delay timer. That is, the timing of the external power supply is transmitted to the delay timer and the power is cut off to the control circuit after a predetermined time set by the user in the delay timer.

As described above, when an external power is supplied according to whether or not external power is supplied by adding a separate power-off detection device, the electric power valve 30 is operated while charging the battery 170 with the external power. , When the external power is cut off, it is possible to receive power from the battery 170.

Even if a delay timer is not included, the power cutoff detection device is provided to select whether to receive power from the internal battery 170 according to whether external power is cut off.

In addition, the power-off detection device may separately sound an alarm when the power supplied from the outside is cut off so that the user can recognize it. The alarm sound may be implemented through a separate alarm device, or may be implemented by being integrally attached to the power cutoff detection device.

Although the embodiments according to the present invention have been described above, they are merely exemplary, and those skilled in the art will understand that various modifications and equivalent ranges of the embodiments are possible therefrom. Therefore, the true technical protection scope of the present invention should be defined by the following claims.

30...Valve (disc) 31...Valve shaft
90...tube 100...actuator part
101...base 103...cover
104... connection means 110... motor
120...switch 130...open gauge
140...Handle 150...Limit switch
170...Battery 200...Pail safe part
210...Adjustment part 211...First operating means

Claims (11)

An actuator unit that moves the valve using electricity as a power source;
Includes; when the supply of external electricity to the actuator unit is stopped, the fail-safe unit for supplying the pre-charged emergency electricity to the actuator unit,
The actuator unit is a fail-safe device that moves the valve using the emergency electricity even when the external electricity is cut off.
According to claim 1,
The fail-safe portion includes a battery charged with the emergency electricity, and switching means for controlling an electrical connection between the actuator portion and the battery,
The switching means cuts off the electrical connection between the actuator part and the battery when the external electricity is supplied to the actuator part,
The switching means is a fail-safe device for electrically connecting the actuator and the battery when the supply of the external electricity is stopped.
According to claim 1,
The actuator unit operates in a normal mode in which the valve is moved according to an external control signal when the external electricity is supplied,
The actuator unit is a fail-safe device that operates in an emergency mode that moves the valve to a preset emergency position, ignoring the external control signal received when the emergency electricity is supplied due to the blocking of the external electricity.
According to claim 3,
When the valve moves to the emergency position in the emergency mode, the fail-safe unit stops supply of the emergency electricity to the actuator unit,
A fail-safe device in which the valve maintains the emergency position until the supply of the external electricity is resumed by stopping the supply of the emergency electricity to the actuator unit.
According to claim 1,
A battery in which the emergency electricity is stored is provided,
When the battery is discharged, the fail safe unit charges the battery using the external electricity,
The fail-safe unit generates a warning signal when the charge amount of the battery is less than or equal to a set value, and transmits it to a management server.
According to claim 1,
The control unit for controlling the actuator unit is provided together with the actuator unit,
The control unit is a fail-safe device for electrically controlling the actuator unit using the external electricity or the emergency electricity.
The method of claim 6,
A switching part for selectively linking the valve to one of the handle part directly moving the valve, the actuator part and the handle part is provided,
A fail-safe device for controlling the actuator unit while leaving the handle unit intact.
According to claim 1,
The control unit for controlling the actuator unit is provided together with the actuator unit,
The control unit is provided with a first operating means and a second operating means,
The first operation means is formed to select a remote mode or a local mode,
The remote mode is a mode for controlling the actuator unit using an external control signal,
The local mode is a fail safe device that is a mode for controlling the actuator unit using the second operating means.
The method of claim 8,
The fail safe unit supplies the emergency electricity to the actuator unit when the supply of the external electricity is interrupted regardless of the remote mode and the local mode,
When the supply of the external electricity is stopped, the fail-safe device to move the valve to a predetermined emergency position using the emergency electricity regardless of the remote mode and the local mode.
According to claim 1,
The actuator unit is provided with first operating means, second operating means, and third operating means,
The first operation means is formed to select one of a remote mode, a local mode, an off mode,
The remote mode is a mode for controlling the actuator unit using an external control signal,
The local mode is a mode for controlling the actuator unit using the second operating means,
The off mode is a mode for forcibly stopping the operation of the actuator unit,
When the supply of the external electricity is stopped, an option menu for determining the operation of the actuator unit is provided in the off mode,
The third safe means is a fail safe device for setting the option menu.
According to claim 1,
When the emergency electricity is supplied, an adjustment unit for setting the operation of the actuator unit is provided,
The control unit is provided with a remote switch and a local switch,
The remote switch sets the operation of the actuator unit in an emergency situation generated while controlling the actuator unit using an external control signal,
The local switch is a fail-safe device for setting an operation of the actuator unit in an emergency situation generated while controlling the actuator unit using a second operating means provided in the adjusting unit.

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