KR101182480B1 - Power module in case of power outage - Google Patents

Abstract

[Problem] The electric actuator of the same structure can be used as a normal electric actuator as an electric actuator which has an emergency interruption function.
[Measures] The power supply module 300 at the time of power failure, the power failure detection circuit 16, the power supply unit 17 at the time of power failure, the motor power switching circuit 18, the control signal generation circuit 19 at the power failure, the control signal switching circuit 20 ) And the AC power source AC and the setting opening by the motor power source switching circuit 18 and the control signal switching circuit 20 when the power failure of the AC power source AC to the electric actuator 100 is not detected. (θsp) is sent to the electric actuator 100, and in the case of detecting a power failure of the AC power supply AC to the electric actuator 100, the power supply at the time of power failure by the motor power switching circuit 18 and the control signal switching circuit 20 EC and the opening degree θSH at the power failure are sent to the electric actuator 100.

Description

Power module in case of power failure {POWER MODULE IN CASE OF POWER OUTAGE}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply module at the time of power failure, which is connected to an electric actuator that performs flow control by adjusting an opening degree of a control object such as a valve or a damper.

Background Art Conventionally, in air conditioning facilities, valves installed in the cold and hot water pipes, dampers, etc., which reduce or decrease the amount of airflow of air to be supplied to the air conditioning area through the duct, are controlled. Actuators are used.

In this type of normal electric actuator, since AC power is supplied as an operating power source, an AC motor is provided as a driving motor inside the electric actuator, and the actual opening degree of the control object is adjusted in accordance with a control command from the air conditioning controller. A control operation is performed in accordance with the set opening degree. In the electric actuator operated by such an AC power supply, when a power failure occurs in the supplied AC power supply, the controlled object to be controlled for the opening degree remains in the operation opening just before the power failure, so that appropriate opening degree control cannot be performed.

Therefore, when the AC power supplied to the electric actuator becomes a power failure, the AC power is forcibly operated at a predetermined opening degree (for example, totally closed), until the AC power returns to the energized state again. An electric actuator of the type which maintains the opening degree of is also proposed and already exists. Hereinafter, this type of electric actuator is called an emergency shut-off function part electric actuator.

At present, two types of electric actuators with emergency interrupting function have been specifically proposed. One type is called a spring return type and the other type is a secondary power source driving type.

[Spring Return Type Electric Actuator]

The spring return type electric actuator is equipped with a return spring pressurized to maintain the closed state with respect to the drive shaft of the electric actuator. When AC power is supplied, the spring return type electric actuator resists the pressing force of the return spring and drives the driving motor to open the control object. When the power failure occurs, the opening degree of the control object is forcibly set to a predetermined opening degree by the pressing force of the return spring (see Patent Document 1, for example).

[Secondary Power Drive Type Electric Actuator]

On the other hand, the secondary power drive type electric actuator uses a drive motor of the electric actuator as a direct current motor, and is equipped with a secondary power source (direct current power source) composed of a secondary battery or an electric double layer capacitor, and supplied with an AC power source. If it is, the AC power is converted into DC and the DC motor is driven to adjust the opening degree of the control object.In case of power failure, the secondary power is used as the operating power, and the DC motor is operated by the secondary power (DC power). By driving, the opening degree of a control object is forcibly made into a predetermined opening degree (for example, refer patent document 2).

By the way, when comparing these two types of emergency shutoff electric actuators, the spring return type electric actuator acts as a resistance against the normal driving of the return spring. Since a large torque motor must be used, it has the disadvantage of increasing the size, weight, and cost of the electric actuator.

On the other hand, the secondary power supply type electric actuator does not have the same disadvantages as the spring return type, and in recent years, there is also an improvement in the capacity of a secondary battery or an electric double layer capacitor, which is a secondary power source, and continues to be advantageous.

[Patent Document 1] Japanese Patent Application Laid-Open No. 2002-174269 [Patent Document 2] Japanese Patent Application Laid-Open No. 2008-89109

However, in the conventional electric actuator, the electric actuator having the emergency shutoff function and the electric actuator (normal electric actuator) without the emergency shutoff function had a large difference in structure, and therefore, it was necessary to manufacture two types of electric actuators. .

If a user who is using a normal electric actuator wants to provide an emergency shut-off function to the electric actuator later on, the existing electric actuator can be greatly modified or a separate electric actuator with an emergency shut-off function can be purchased separately. In order to replace the electric actuator, the cost and the time and effort of retrofitting and replacing were incurred.

For example, when converting a normal electric actuator into a secondary power drive type electric actuator, since an AC motor is used for the drive motor of a normal electric actuator, this AC motor is replaced with the DC motor, a control board Needs to be changed, the addition of a module with the emergency shutdown function, etc. In addition, the replaced parts need to be discarded. As described above, when the ordinary electric actuator is converted into a secondary power drive type electric actuator, the cost, time, and effort required for the conversion are excessive.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object thereof is to provide a power supply module in case of a power failure, which makes it possible to use an electric actuator of the same configuration as an electric actuator having an emergency interruption function as a normal electric actuator. It is.

In order to achieve the above object, the present invention relates to an alternating-current detection means for detecting an alternating current of an AC motor, a controlled object driven by the alternating-current motor, and a set-up opening degree detected by the actual degree of detection. Control means for generating a control output to match the control output; drive output generation means for receiving the control output generated by the control means and generating a drive output to the AC motor; and an energy source of the drive output generated by the drive output generation means. AC power relay means for relaying AC power to the electric actuator to the power supply module in case of power failure, which is detachably connected via a cable to an electric actuator having an input portion of an AC power supply and an input portion of a set opening degree, and to the electric actuator. A power failure detection means for detecting a power failure of the AC power supply, a power supply means at the time of power failure, which is an energy source at the time of power failure in place of the AC power supply, A set opening relay means for relaying a set opening degree to the same actuator, a blackout opening output means for outputting a predetermined opening degree to be controlled at the time of blackout as a blackout, and an AC power relay relayed by the AC power relay means. And when the power failure means from the power supply means at the time of power failure, and the power failure detection means does not detect the power failure of the AC power source, selects the AC power relayed by the AC power relay means as the AC power input to the electric actuator. When the power failure detection means detects a power failure of the AC power supply, the power supply selection means selects the power supply when the power failure occurs from the power supply means when the power failure is inputted to the electric actuator, and the power failure detection means detects the power failure of the AC power supply. If not, the set opening degree is inputted to the electric actuator. When a static opening degree is selected and a power failure detection means detects a power failure of an AC power source, a set opening degree selection means for selecting a set opening degree for selecting the opening degree at the time of power failure outputted by the opening degree output means at a power failure is provided. will be.

When the power supply module at the time of power failure of the present invention is not connected to the electric actuator, the electric actuator operates under the supply of AC power from the input unit and the set opening degree, and control is performed to match the actual degree of control to the set opening degree. All. As a result, the electric actuator functions as a normal electric actuator.

When the power supply module at the time of power failure of the present invention is connected to the electric actuator, the presence or absence of a power failure of the AC power supply to the electric actuator within the power supply module during the power failure is detected, and when the power failure is not detected, the AC power relay means relays. The AC power supply and the set opening degree relayed by the relay means are supplied to the electric actuator, and in the case where a power failure is detected, the power supply from the power supply means at the time of power failure and the opening degree at the time of power failure from the opening output means at the power failure are supplied to the electric actuator. do.

As a result, when a power failure does not occur, the electric actuator is operated by supplying the AC power supply and the set opening degree from the power supply module at the time of power failure, and control is performed to match the actual opening degree of the control object to the set opening degree. In the event of a power failure, the electric actuator is operated by supplying the power supply at the time of power failure and the opening degree at the time of power failure, and the control is performed to match the opening degree of the control object to the opening degree (for example, total closing) at the time of power failure. All. As a result, the electric actuator functions as an electric actuator having an emergency interruption function.

According to the power supply module at the time of power failure of the present invention, when the electric actuator is not connected to the electric actuator, the electric actuator functions as a normal electric actuator, and when it is connected to the electric actuator, the electric actuator as an electric actuator having an emergency shut-off function. It becomes possible to make it function, and it becomes possible to use the electric actuator of the same structure as an electric actuator which has an emergency interruption function as a normal electric actuator by connecting a power supply module at the time of a power failure.

1 is a block diagram showing the main part of the electric actuator before the power supply module is connected at the time of power failure according to the present invention.
2 is an external view of the electric actuator.
Fig. 3 is a diagram showing a state in which an embodiment (Embodiment 1) of the power supply module during power failure according to the present invention is connected to this electric actuator.
4 is a block diagram of an essential part in the case where the power supply module is connected to the electric actuator at the time of power failure.
5 is a view showing the internal structure of the power supply module during a power failure.
FIG. 6 is a diagram showing an example (Embodiment 2) in which the DC / AC power conversion unit in the power supply unit at the time of power failure is configured by the class-D amplifier and power supply filter in the first embodiment.

EMBODIMENT OF THE INVENTION Hereinafter, embodiment of the power failure module which concerns on this invention is described in detail based on drawing.

[Electric Actuator]

1 is a block diagram showing the main part of the electric actuator before connecting the power supply module at the time of power failure according to the present invention. In FIG. 1, 100 is an electric actuator, 200 is a valve (control object) by which the opening degree is controlled by this electric actuator 100. FIG.

The electric actuator 100 includes a terminal block 1, a power supply circuit 2, a control board 3, a motor drive circuit 4, an AC motor 5 and an AC motor 5 The gear train 6 which transmits the driving force of the motor, the output shaft 7 which adjusts the opening degree of the valve 200 as an output end of this gear train 6, and the rotation angle position of this output shaft 7 are valve | bulb 200 A potentiometer 8 for detecting as the actual seal angle? Pv and a limit switch 9 for detecting the arrival of the output shaft 7 to a predetermined rotation angle position.

In the electric actuator 100, the AC power source AC is input to the terminal block 1 as an operating power source from the outside, and this AC power source AC becomes the required internal power source in the power supply circuit 2, and then the controller board. Given in (3). Moreover, the setting opening degree (theta sp) is input to the terminal block 1 as a control command from an air conditioning controller (not shown), and this input setting opening degree (theta sp) is input to the control board 3 as the setting opening signal S1. Is sent. In addition, the controller board 3 is given the actual degree θpv of the valve 200 from the potentiometer 8 as the actual degree detection signal S2, and the predetermined value of the output shaft 7 from the limit switch 9 is given. A signal indicating arrival at the rotational angle position is given as a predetermined rotational angle position arrival signal S3.

The control board 3 receives the set opening signal S1 from the air conditioning controller and the opening degree detection signal S2 from the potentiometer 8 to set the opening degree θpv of the valve 200 to the set opening degree θsp. Generates a control output (S4) to match with and sends the generated control output (S4) to the motor drive circuit (4). The motor drive circuit 4 receives the control output S4 from the control board 3 and generates a drive output M1 to the AC motor 5.

The external view of this electric actuator 100 is shown in FIG. 2 to 10 are power & signal lines that draw the AC power source AC and the set opening degree θsp into the electric actuator 100.

In this electric actuator 100, the drive output M1 generated by the motor drive circuit 4 is sent to the AC motor 5 so that the control of matching the actual opening degree θpv of the valve 200 with the set opening degree θsp is performed. Is done. As a result, the electric actuator 100 functions as a normal electric actuator.

[When used as an electric actuator with an emergency interruption function]

In the case where the electric actuator 100 is to be used as an electric actuator having an emergency shutoff function, as shown in FIG. 3, the cable 11 is connected between the electric actuator 100, the power line 12, and the signal line 13. The power supply module 300 is connected at the time of power failure through.

That is, the current & signal line 10 is removed from the electric actuator 100, and the power line 12 and the signal line 13 are connected to the input side of the power module 300 at the time of power failure, and the power module 300 at the time of power failure. The cable 11 is connected between the output side of the side and the input side of the electric actuator 100.

4 shows a block diagram of the main part in the case where the power supply module 300 is connected to the electric actuator 100 at the time of power failure. The power supply module 300 at the time of power failure is one embodiment (Embodiment 1) of the module at the time of power failure according to the present invention. The terminal block 15, the power failure detection circuit 16, the power failure unit 17 at the time of power failure, and a motor power supply The switching circuit 18, the control signal generation circuit 19 at the time of power failure, and the control signal switching circuit 20 are provided.

When the power supply module 300 is connected to the electric actuator 100 at the time of power failure, the power supply module 12 and the signal line 13 are connected to the terminal block 15 at the power supply module 300 at the time of power failure. AC power relay relayed by the motor is sent to the motor power switching circuit 18, and the set opening degree θsp relayed by the terminal block 15 is sent to the control signal switching circuit 20.

The power failure detection circuit 16 monitors the AC power AC relayed by the terminal block 15 in the power supply module 300 at the time of power failure, and indicates whether there is a power failure detection signal indicating whether a power failure occurs in the AC power source AC. (S5) is output.

In case of power failure, the power supply unit 17 uses an AC power source AC relayed by the terminal block 15 as a branch input, and converts the branch input into a DC power source, and an AC / DC power converter 17-1. A charging circuit 17-2 that operates by receiving the DC power converted by the power conversion unit 17-1, and a capacitor (electric double layer capacitor or lithium ion capacitor) charged by the charging circuit 17-2 ( 17-3 and a DC / AC power conversion unit 17-4 which generates an AC power by the electric charges accumulated in the capacitor 17-3 and outputs it as the power supply EC at the time of power failure. In addition, an inverter is used as the DC / AC power converter 17-4.

The motor power switching circuit 18 receives the AC power AC sent from the terminal block 15 and the power failure EC sent from the power supply unit 17 at the time of power failure, and receives the power supply detection circuit 16 from the power failure detection circuit 16. When the power failure detection circuit 16 does not detect the power failure of the AC power source AC based on the power failure detection signal S5, the AC power supplied from the terminal block 15 as an AC power source supplied to the electric actuator 100. When the power supply AC is selected and the power failure detection circuit 16 detects a power failure of the AC power supply AC, the power supply at the time of power failure supplied from the power supply unit 17 at the time of power failure as an AC power supply to the electric actuator 100. Select (EC). AC power from the selected motor power switching circuit 18 is sent to the terminal block 1 of the electric actuator 100.

The control signal generation circuit 19 at the time of power failure is based on the presence / absence detection signal S5 from the power failure detection circuit 16, when the power failure detection circuit 16 detects the power failure of the AC power source AC. The predetermined opening degree to be maintained at the time of power failure is output by the 200 as the opening degree θSH (control signal at power failure).

The control signal switching circuit 20 inputs the set opening degree [theta] sp sent from the terminal block 15 and the blackout opening degree [theta] SH sent from the control signal generation circuit 19 at the time of power failure, and the blackout detection circuit 16 The terminal block 15 is a set opening degree inputted to the electric actuator 100 when the blackout detection circuit 16 does not detect the blackout of the AC power source AC based on the blackout detection signal S5 from FIG. Selects the set opening degree θsp sent from the control panel, and when the blackout detection circuit 16 detects a blackout of the AC power source AC, it is a setting opening input to the electric actuator 100 as a control opening; Selects the opening degree (θSH) from. The setting opening degree from this selected control signal switching circuit 20 is sent to the terminal block 1 of the electric actuator 100 as the setting opening signal (control signal) S1.

In this case, the cable 11 connecting the power supply module 300 and the electric actuator 100 at the time of power failure may relay the AC power AC selectively sent from the motor power switching circuit 18 and the power supply EC at the time of power failure. And a relay line of a set opening degree [theta] sp and an electrostatic start opening degree [theta] SH selectively sent from the control signal switching circuit 20.

5 shows the internal structure of the power supply module 300 at the time of power failure. FIG. 5B is a view of the inside of the power supply module 300 when the power failure occurs, and FIG. 5A is a view of the terminal block 15 in FIG. 5C is a view of the capacitor 17-3 side in FIG. 5B viewed from the B direction. In the power supply module 300 at the time of power failure, a large number of capacitors (electric double layer capacitors or lithium ion capacitors) 17-3 are provided in order to secure large capacity power during power failure.

[When power failure does not occur]

The motor power switching circuit 18 in the power supply module 300 at the time of power failure has a power failure detection signal from the power failure detection circuit 16 when no power failure occurs in the AC power source AC to the electric actuator 100. ), The AC power supplied from the terminal block 15 is selected as the AC power supplied to the electric actuator 100. AC power AC from the selected motor power switching circuit 18 is sent to the terminal block 1 of the electric actuator 100.

The control signal switching circuit 20 of the module 300 at the time of power failure has a power failure detection signal from the power failure detection circuit 16 when no power failure occurs in the AC power source AC to the electric actuator 100. Based on S5), the set opening degree θsp sent from the terminal block 15 is selected as the set opening degree inputted to the electric actuator 100. The set opening degree [theta] sp from this selected control signal switching circuit 20 is sent to the terminal block 1 of the electric actuator 100.

As a result, when no power failure occurs in the AC power source AC to the electric actuator 100, the drive output from the motor drive circuit 4 using the AC power source AC as the energy source in the electric actuator 100 ( M1) is produced | generated and control which matches the actual opening degree (theta) pv of the valve 200 with the setting opening degree (theta) sp is performed.

[In case of power failure]

When a power failure occurs, the motor power switching circuit 18 of the power supply module 300 responds to a power failure detection signal S5 from the power failure detection circuit 16 when a power failure occurs in the AC power source AC to the electric actuator 100. Based on this, the power failure EC from the power failure unit 17 is selected as the AC power supply to the electric actuator 100. The power supply EC at the time of power failure from the selected motor power switching circuit 18 is sent to the terminal block 1 of the electric actuator 100.

In addition, when a power failure occurs in the AC power supply AC to the electric actuator 100, the control signal switching circuit 20 of the module 300 at the time of power failure detects whether there is a power failure detection signal S5 from the power failure detection circuit 16. On the basis of this, the power failure start opening degree? SH from the power failure control signal generation circuit 19 is selected as the set opening degree inputted to the electric actuator 100. The blackout starting degree? SH from this selected control signal switching circuit 20 is sent to the terminal block 1 of the electric actuator 100.

As a result, when a power failure occurs in the AC power source AC, the drive output M1 from the motor drive circuit 4 is generated by using the electric power source EC as the energy source in the case of a power failure in the electric actuator 100, and the valve Control is performed to match the actual opening degree [theta] pv of 200 to the opening degree [theta] SH at the time of power failure.

In this example, when the power failure detection circuit 15 detects a power failure of the AC power source AC, the control signal generation circuit 19 at the power failure outputs the power failure opening? The opening degree [theta] SH at the time of power failure may be given to the control signal switching circuit 20 at all times.

[When power failure is restored]

The power supply module 300 at the time of power failure uses the power failure EC generated by the power supply unit 17 at the time of power failure even when a power failure occurs in the AC power source AC. Continue monitoring (AC). When the blackout of the AC power supply AC is restored, the blackout detecting circuit 16 outputs the motor power switching circuit 18, the control signal generating circuit 19 at the time of blackout, and the control signal by means of the blackout detecting signal S5. The switching circuit 20 is informed.

The motor power switching circuit 18 supplies the AC power supply AC supplied from the terminal block 15 to the electric actuator 100 when it is known that the power failure of the AC power supply AC has been restored from the power failure detection circuit 16. Select as AC power. From this selected motor power switching circuit 18, the AC power source AC is sent to the terminal block 1 of the electric actuator 100.

When the control signal switching circuit 20 is known to recover the power failure of the AC power supply AC from the power failure detection circuit 16, the control signal switching circuit 20 transmits the set opening degree θsp sent from the terminal block 15 to the electric actuator 100. It selects as setting opening to input. The set opening degree [theta] sp from this selected control signal switching circuit 20 is sent to the terminal block 1 of the electric actuator 100.

As a result, when the power failure of the AC power supply AC is restored, the drive output M1 from the motor drive circuit 4 using the AC power supply AC as the energy source in the electric actuator 100 as before the power failure. Is generated and control is performed to match the opening degree θpv of the valve 200 to the set opening degree θsp.

In this way, when the power supply module 300 at the time of power failure is connected to the electric actuator 100, the electric actuator 100 which has functioned as a normal electric actuator until then starts to function as an electric actuator having an emergency interruption function.

In this electric actuator 100, the terminal block 1 corresponds to the input of the AC power and the set opening degree described in the present invention, the control board 3 corresponds to the control means, and the motor drive circuit 4 generates the drive output. The AC motor 5 corresponds to the AC motor, and the potentiometer 8 corresponds to the detection means. In addition, in the power supply module 300 at the time of power failure, the terminal block 15 corresponds to the AC power relay means and the set opening relay described in the present invention, and the power failure detection circuit 16 corresponds to the power failure detection means, Numeral 17 corresponds to the power supply means at the time of power failure, motor power switching circuit 18 corresponds to the power supply selection supply means, and control signal generation circuit 19 at the power failure corresponds to the opening output means at the time of power failure, and control signal switching. The circuit 20 corresponds to the setting opening selective transmission means.

As described above, according to the power supply module 300 at the time of power failure of the present embodiment, when the electric actuator 100 is not connected to the electric actuator 100, the electric actuator 100 functions as a normal electric actuator and the electric actuator 100 When connected to the electric actuator 100, the electric actuator 100 can function as an electric actuator having an emergency interruption function.

In this case, although the work of connecting the cable 11, the power line 12, and the signal line 13 is necessary, the modification of the electric actuator 100 is not necessary, and the same configuration depends on whether the power supply module 300 is connected at the time of power failure. The electric actuator 100 can be used as an electric actuator having an emergency interruption function as a normal electric actuator.

This eliminates the need for manufacturing two types of electric actuators on the manufacturer side. In addition, it is possible to easily change from a normal electric actuator to an electric actuator having an emergency interruption function in the field.

In this example, since the electric actuator 100 is of a secondary power supply type, as compared with the spring return type, since there is no pressing force of the return spring, it is unnecessary to increase the capacity of the drive motor and increase the strength of the gear. In addition, since the power supply module 300 can be installed at any position during power failure, the electric actuator 100 can be changed to an electric actuator having an emergency shutoff function even in a narrow place.

[Embodiment 2]

In the first embodiment described above, an inverter is used as the DC / AC power conversion unit 17-4 by the power supply unit 17 during power failure, but as shown in FIG. 6 as the second embodiment, a class D amplifier (DC → The DC / AC power converter 17-4 may be configured by the AC (17-41) and the power filter (17-42), or may be configured by AC power up.

In the above-described example, the power supply unit 17 during power failure in the power supply module 300 during power failure is configured by using a capacitor (electric double layer capacitor or lithium ion capacitor), but a lithium battery or the like may use the same secondary battery. It is also possible to use a primary battery. Thus, as a means of generating the power supply EC at the time of power failure, various devices, such as a primary power supply, a secondary battery, and an electric double layer capacitor, can be used, and can select suitably and can use.

The power supply module at the time of power failure of the present invention is a power supply module at the time of power failure connected to an electric actuator that controls the flow rate by adjusting the opening degree of a control object such as a valve or a damper, and can be used in various fields such as air conditioning equipment.

One … Terminal block; Power Supply Circuit,
3…. Control board; Motor drive circuit,
5 ... AC motor, 6.. Gear Row,
7 ... 8 output shaft; Potentiometer,
9 ... Limit switch, 10.. Impulse & signal line,
11 ... Cable, 12... Power Line,
13 ... Signal line, 15... Terminal Block,
16. 17, power failure detection circuit; Power supply unit in case of power failure
17-1. AC / DC power converter, 17-2. Charging Circuit,
17-3. Capacitors (electric double layer capacitors or lithium ion capacitors),
17-4. DC / AC power conversion unit, 17-41. Class D amplifier,
17-42. Power filter; Motor power switching circuit,
19. Control signal generation circuit in case of power failure; Control signal switching circuit,
100 ... Electric actuator, 200... valve,
300... Power module in case of power failure.

Claims (3)

AC motor, a seal degree detecting means for detecting a seal degree of a control target driven by the AC motor, and a control output for matching the seal degree detected by the seal degree detecting means with a set opening degree. Control means for generating, drive output generation means for receiving a control output generated by the control means for generating a drive output to the AC motor, and an AC power source serving as an energy source of drive output generated by the drive output generation means. A power supply module in case of power failure, which is detachably connected to the outside of the electric actuator via a cable to an electric actuator including an input part and the input part of the set opening degree,
AC power relay means for relaying AC power to the electric actuator;
An electrostatic detection means for detecting an electrostatic power of an AC power supply to the electric actuator;
Power supply means at the time of power failure, which is an energy source at the time of power failure instead of the AC power source;
A set opening degree relay means for relaying a set opening degree to the electric actuator;
Power failure opening degree output means for outputting, as the opening degree at the time of blackout, a predetermined opening degree that the control object should maintain at the time of power failure;
AC power relayed by the AC power relay means and AC power supplied from the power supply means at the time of power failure, and AC power input to the electric actuator when the power failure detection means is not detecting the power failure of the AC power supply. As the power source, an AC power source relayed by the AC power source relay means is selected. When the power failure detection unit detects a power failure of the AC power source, it is an AC power source input to the electric actuator. A power selection supply means for selecting a;
When the blackout detecting means does not detect the blackout of the AC power supply, the set opening degree relayed by the set opening degree relay means is selected as the set opening degree input to the electric actuator, and the blackout detecting means performs the blackout of the AC power supply. And a set opening degree selection transmitting means for selecting the opening degree at the time of power failure output by the opening degree output means at the outage as a set opening degree input to the electric actuator. The method according to claim 1,
The power supply unit at the time of power failure, the power supply module at the time of power failure, characterized in that for outputting the power supply when the power failure of the alternating DC power. The method according to claim 1,
The power supply means at the time of power failure,
AC / DC power conversion means for converting the AC power relayed by the AC power relay means into a branch input and converting the branch input into a DC power source;
Power storage means for accumulating electric charges obtained from the direct current power source converted by said AC / DC power supply conversion means;
And a DC / AC power converting means for generating alternating power by charges stored in the power storage means and outputting the alternating power to the power supply selection supply means as power supply in case of power failure.

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